Lexmark C750 Service Manual
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- Lexmark C750 | Service Manual - Page 1
Revised: July 27, 2005 Lexmark™ C750 5060-00x • Table of contents • Start diagnostics • Safety and notices • Trademarks • Index Lexmark and Lexmark with diamond design are trademarks of Lexmark International, Inc., registered in the United States and/or other countries. - Lexmark C750 | Service Manual - Page 2
errors. Lexmark.com. Lexmark may use or distribute any of the information you supply Lexmark International, Inc., registered in the United States and/or other countries. ImageQuick, Optra Forms, and PrintCryption are trademarks of Lexmark International, Inc. LEXFAX is a service mark of Lexmark - Lexmark C750 | Service Manual - Page 3
table-finisher option ...2-3 2-4 2-4 2-5 2-5 2-5 Error code table ...2-6 9xx service errors ...2-6 1xx service errors ...2-9 Sub error code table ...2-17 Programming errors - P101 through P116 ...2-20 Understanding the printer operator panel ...2-20 Operator panel buttons ...2-20 Color Menu ...2-22 - Lexmark C750 | Service Manual - Page 4
Paper jam ...2-82 271 Paper jam - Check Bin 1 ...2-84 272 Paper jam - Check Bin x ...2-85 274 Paper jam - Check Bin 4 ...2-86 280 Paper jam ...2-87 900 RIP Software Error ...2-88 925 Error code ...2-90 926 Error code ...2-90 927 Error code ...2-91 iv Service Manual - Lexmark C750 | Service Manual - Page 5
or streaks ...2-137 Vertical lines or streaks ...2-138 Light lines or streaks appear on the page ...2-138 White streak in color plane ...2-138 Blank page (no image) ...2-139 Entire page is mostly one color-Full bleed planes in one color ...2-140 Missing colors-Complete or partially missing color - Lexmark C750 | Service Manual - Page 6
Download Emuls ...3-10 Demo Mode ...3-10 Factory Defaults ...3-11 Energy Conserve ...3-11 ITU Alignment ...3-11 Auto Color TOP FINE MAR ADJ ...3-16 MISC TESTS ...3-16 Motor Detect ...3-16 Belt Tracking (ITU 4th point adjustment) ...3-17 PRINT TESTS ...3-18 Print Tests (input 29 vi Service Manual - Lexmark C750 | Service Manual - Page 7
Flash Test ...PRINTER SETUP ...Defaults ...Reset Calibrat...Page Count ...Perm Page Count ...Serial Number ...Engine Setting x ...Model Name ...Configuration ID ...Edge to Edge ...Cal Ref Adj ...EP SETUP ...EP Defaults ...Fuser Temp ...DC Charge Adjust ...Dev Bias Adj ...Transfer Adjust ...ERROR LOG - Lexmark C750 | Service Manual - Page 8
...5-5 RIP board cabling ...5-6 Connectors ...5-7 Engine board ...5-7 RIP board ...5-14 Transfer high voltage power supply (HVPS) ...5-19 Developer high voltage power supply (HVPS) board ...5-20 Low voltage power supply (LVPS) ...5-22 Low voltage power supply (LVPS) ...5-24 viii Service Manual - Lexmark C750 | Service Manual - Page 9
...6-3 Scheduled maintenance ...6-4 Parts catalog ...7-1 How to use this parts catalog ...7-1 Assembly 1: Covers ...7-2 Assembly 2: Cartridge mounting ...7-6 Assembly 3: Fuser ...7-8 Assembly 4: Fuser drive ...7-12 Assembly 5: Vacuum transport belt assembly ...7-13 Assembly 6: Transfer ...7-14 - Lexmark C750 | Service Manual - Page 10
Service tips...A-1 Printhead diagnostics ...A-1 Printhead alignment ...A-4 Identifying the printheads ...A-4 Printhead mechanical alignment ...A-5 Printer registration (only for black printhead replacement) ...A-10 Electronic color page ...B-12 Index ...I-1 Part number index ...I-7 x Service Manual - Lexmark C750 | Service Manual - Page 11
in the wavelength region of 770-795 nanometers. The laser system and printer are designed so there is never any human access to laser radiation above a Class I level during normal operation, user maintenance, or prescribed service condition. Laser Der Drucker erfüllt gemäß amtlicher Bestätigung der - Lexmark C750 | Service Manual - Page 12
galliumarsenid laser, som arbejder på bølgelængdeområdet 770-795 nanometer. Lasersystemet og printeren er udformet således, at mennesker aldrig udsættes for en laserstråling over Klasse I-niveau ved normal drift, brugervedligeholdelse eller obligatoriske servicebetingelser. xii Service Manual - Lexmark C750 | Service Manual - Page 13
utsätts för laserstrålning över Klass I-nivå vid normal användning, underhåll som utförs av användaren eller annan föreskriven serviceåtgärd. Laser-melding Skriveren er godkjent i USA etter kravene i DHHS 21 CFR, underkapittel J, for klasse I (1) laserprodukter, og er i andre land godkjent som et - Lexmark C750 | Service Manual - Page 14
5060-00x xiv Service Manual - Lexmark C750 | Service Manual - Page 15
5060-00x Laser notice xv - Lexmark C750 | Service Manual - Page 16
5060-00x xvi Service Manual - Lexmark C750 | Service Manual - Page 17
• • • components. The manufacturer is not responsible for safety in the event of use of unauthorized replacement parts. The maintenance information for this product has been prepared for use by a professional service person and is not intended to be used by others. There may be an increased risk of - Lexmark C750 | Service Manual - Page 18
quina. El personal cualificado debe ser consciente de este peligro y tomar las precauciones necesarias. PRECAUCIÓN: este símbolo indica que el voltaje de la parte del equipo con la que está trabajando es peligroso. Antes de empezar, desenchufe el equipo o tenga cuidado si, para trabajar con él, debe - Lexmark C750 | Service Manual - Page 19
5060-00x Informació de Seguretat • La seguretat d'aquest producte es basa en l'avaluació i aprovació del disseny original i els components específics. El fabricant no es fa responsable de les qüestions de seguretat si s'utilitzen peces de recanvi no autoritzades. La informació pel manteniment d' - Lexmark C750 | Service Manual - Page 20
an error indicator table, symptom tables, and service checks used to isolate failing field replaceable units (FRUs). 3. Diagnostic aids contains tests and checks used to locate or repeat symptoms of printer problems. 4. Repair information provides instructions for making printer adjustments - Lexmark C750 | Service Manual - Page 21
The Lexmark™ C750 is a network color printer that uses electrophotographic technology to deliver high quality images, presentation graphics, line art, and text. It prints up to 20 pages per minute (ppm) for both four-color and monochrome print jobs. The printer's flexible design allows it to support - Lexmark C750 | Service Manual - Page 22
conditions. At power-on After 8 hours of power saver Approximately every 500 pages, at the end of a job After changing a print cartridge After changing an intermediate transfer unit A manual calibration can be initiated by selecting Color Adjustment from the Utilities Menu. 1-2 Service Manual - Lexmark C750 | Service Manual - Page 23
setting is 4. Color level 4 and level 5 are the same. The toner darkness setting is available through the operator panel under the Print Quality menu or through the Lexmark C750 PostScript emulation driver. Printer specifications Dimensions Description Printer Lexmark C750(n) Lexmark C750dn (inc - Lexmark C750 | Service Manual - Page 24
Lexmark C750 printer to an oil web capable printer. The web oiler upgrade kit includes an oiler fuser and web oiler. Replacements Description 115 V web oiler fuser 220 V web oiler fuser 100 V web oiler fuser Web oiler replacement Part number 12G6514 12G6515 12G6502 12G6545 1-4 Service Manual - Lexmark C750 | Service Manual - Page 25
Lexmark C750(n) Lexmark C750dn Status 2400 image quality printing Idle (standby) 2400 image quality printing Idle (standby) Environment Printer Storage and shipping (packaged printer) with or without print cartridge - Temperature: -40 to 110° F (-40 to 43.3° C) • Print cartridge - Temperature: -40 - Lexmark C750 | Service Manual - Page 26
speed 2400 Image quality Simplex Printer options installed or selected Available printer memory Media size and type Resolution Printer usage setting Time to first print Time to first print from standby mode: • Black: - Lexmark C750 | Service Manual - Page 27
Memory configuration DRAM memory Standard Maximum Lexmark C750(n) 64MB 512MB Lexmark C750dn 128MB 512MB Available memory options Optional 64MB, 128MB and 256MB SDRAM DIMMs are available from Lexmark. The memory options are 168pin synchronous DRAM DIMMs (dual in-line memory modules). Flash memory - Lexmark C750 | Service Manual - Page 28
5, 6, 7 x 6, 7 2,000-Sheet drawer Multi-purpose tray Media size supported A4 8.27 in. x 11.7 in. (210 mm x 297 mm) A5 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 1-8 Service Manual Output Expander x x x x x x x x x x x x x x x x Standard output 500-Sheet input 5-Bin - Lexmark C750 | Service Manual - Page 29
selected, the page is formatted for 8.5 x 14 in. (215.9 x 355.6 mm) unless the size is specified in the software application. 4 Statement and Folio are supported as standard size through software only. Tray size sensing must be turned off before this standard size is visible in the paper-size menu - Lexmark C750 | Service Manual - Page 30
- upper limit (grain short) a, f Index Bristol Tag Cover Transparencies i, j Labels - upper limit Laser printer type Paper Dual-web paper Polyester Vinyl g, h Integrated forms Envelopes d, e Pressure sensitive area Paper base (75 to 135 g/m2) 16 to 28 lb bond (60 to 105 g/m2) 1-10 Service Manual - Lexmark C750 | Service Manual - Page 31
Lexmark's criteria. Refer to the Card Stock and Label Guide for more details. i Lexmark transparency numbers 12A5940 and 12A5941 are supported ) a Index Bristol Tag Cover Transparencies i,j Labels - upper limit Laser printer type Paper Dual-web paper Polyester Vinyl G, H Integrated forms Envelopes - Lexmark C750 | Service Manual - Page 32
and Label Guide for more details. i Lexmark transparency numbers 12A5940 and 12A5941 are supported from the standard tray, optional 500-sheet trays and the multipurpose feeder. j Lexmark transparency numbers 12A5150 and 12A5151 are supported from the multipurpose feeder only 1-12 Service Manual - Lexmark C750 | Service Manual - Page 33
High Voltage Power Supply Image Transfer Unit Black Light Amplification by Stimulated Emission of Radiation Liquid Crystal Display Light-Emitting Diode Low Voltage Power Supply Magenta Multipurpose Feeder Masked Read Only Memory Microswitch Nonvolatile Random Access Memory Original Equipment - Lexmark C750 | Service Manual - Page 34
5060-00x 1-14 Service Manual - Lexmark C750 | Service Manual - Page 35
page 2-128 "HCOF error code table" on page 2-122 "2xx Paper jam message table" on page 2-25 "User attendance message table" on page 2-28 "Service checks" on page 2-42 Note: There may be printer error messages that are not contained in this service manual. Call your next level support for assistance - Lexmark C750 | Service Manual - Page 36
Front panel LED blinks. Redrive exit roller turns. Any cartridge errors are posted such as a defective cartridge, Lexmark Return Program information, or missing cartridge. Any applicable maintenance messages display such as 80 Fuser Maintenance or 83 Maintenance. One of the toner low messages - Lexmark C750 | Service Manual - Page 37
are missing Paper feed problems, base printer Paper feed problems, integrated tray Paper feed problems, MPF Printer prints black only, no colors Action Go to "925 Error code" on page 2-90. Go to "927 Error code" on page 2-91. Go to "926 Error code" on page 2-90. Go to "AC and DC power service check - Lexmark C750 | Service Manual - Page 38
Toner smears or rubs off the page with no error code displayed" on page 2-145. Go to "Horizontal lines or streaks" on page 2-137. Go to "Cold fuser service" on page 2-127. Go to "Hot fuser service" on page 2-127. Go to "Excessive fuser -sheet option Symptom Printer fails to recognize Service Manual - Lexmark C750 | Service Manual - Page 39
1 message appears. Ready and Bin x Full message appears. Action Go to "The printer does not recognize one or more output options as installed." on page 2-105 Go clear message Finisher is inoperative Front door is open and no error message appears Inoperative fan Full chad box, no message appears Chad - Lexmark C750 | Service Manual - Page 40
board may cause this type of error. Turn the printer off and on to try and clear the error code. If this does not fix the problem after several attempts, call your next level support before replacing the engine board. Interface violation by RIP-check all cabling and connections to the RIP board - Lexmark C750 | Service Manual - Page 41
Invalid Belt-replace the ITU assembly. See "ITU assembly removal" on page 4-37. Fuser Fan-go to "925 Error code" on page 2-90. VTB Fan-go to "926 Error code" on page 2-90. RIP Fan-go to "927 Error code" on page 2-91. Unable to find zero crossover point-Replace the LVPS. See "Low voltage power supply - Lexmark C750 | Service Manual - Page 42
5060-00x Error code 960 RAM Memory Error 961 RAM Memory Error 962 RAM Memory Error 963 RAM Memory Error Action RAM soldered on board is bad. Replace the RIP board. See "RIP board removal" on page 4-70. Errors 961 through 963 indicate that a memory error has occurred on RAM x in slot x installed on - Lexmark C750 | Service Manual - Page 43
5060-00x Error code 983 comm Action Invalid command received service errors 100 ITU Error 101 ITU Error 102 ITU Error ITU stall-go to "100 ITU Error" on page 2-42. Invalid ITU memory-replace the ITU. See "ITU assembly removal" on page 4-37. ITU shorted thermistor-replace the ITU. See "ITU - Lexmark C750 | Service Manual - Page 44
Error code 103 ITU Error 106 Printhead Error Action Memory load error-replace the ITU. See "ITU assembly removal" on page 4-37. Cyan printhead lost Hsync Check for the correct installation of the all the cables the cables are the cables are the cables are connected the cables are the cables are - Lexmark C750 | Service Manual - Page 45
5060-00x Error code 112 Printhead Error Action No first Hysnc (yellow) Check for the correct installation of the all the cables to the RIP board assembly and to the printhead assembly; J2, J3 and J4 on the RIP board. Go to "RIP board" on page 5-14. If the cables are connected correctly to the RIP - Lexmark C750 | Service Manual - Page 46
page 2-46. Fuser over temperature-hot roll. Go to "124 Error code" on page 2-46. Fuser over temperature-BUR. Go to "125 Error code" on page 2-47. Fuser open thermistor-hot roll. Go to "126 Error code" on page 2-47. Fuser open thermistor-BUR. Go to "127 Error code" on page 2-48. 2-12 Service Manual - Lexmark C750 | Service Manual - Page 47
long-BUR. Go to "135 Error code" on page 2-55. Fuser cam position not found-go to "136 Error code" on page 2-56. DC motor accel stall-registration. Replace the registration motor assembly. See "Registration motor" on page 4-64. If this does not fix the problem, replace the engine board. See "Engine - Lexmark C750 | Service Manual - Page 48
lost lock. Go to "157 Error code" on page 2-63. Cyan cartridge motor lost lock. Go to "158 Error code" on page 2-64. Yellow cartridge motor lost lock. Go to "159 Error code" on page 2-64. ITU belt BLDC motor mfg. unknown. Go to "160 Error code" on page 2-65. Fuser drive BLDC motor mfg. unknown. Go - Lexmark C750 | Service Manual - Page 49
checks in "Printhead diagnostics" on page 3-1. 173 Motor Mirror motor lock not achieved (magenta problem persists, go to "Printhead diagnostics" on page 3-1. 181 PSD Error PSD sensor error (cyan). Update machine code. Run a Line Length test page. See "Prt Line Len Pg" on page 3-19. If the problem - Lexmark C750 | Service Manual - Page 50
No EOS reading (yellow). Update the machine code. Run a Line Length test page. See "Prt Line Len Pg" on page 3-19. If the problem persists, go to "Printhead diagnostics" on page 3-1. 196 Service Thermal System The printer has detected an error in the printhead thermal drift compensation system - Lexmark C750 | Service Manual - Page 51
error code table Use this table to troubleshoot the printer when 9xx and 1xx error codes are displayed. When a 9xx or 1xx error code is displayed, press and hold Return and press Select to view the Sub error code. Sub error code Leading edge of image position has reached image halt location. Paper - Lexmark C750 | Service Manual - Page 52
error code Fuser exit error detected. Tray 3 pick motor stall error detected. Tray 3 pick motor PWM error detected. Tray 3 pick motor Encoder error detected. Tray 4 feed motor stall error detected. Tray 4 feed motor PWM error detected. Tray 4 feed motor Encoder error detected. 2-18 Service Manual - Lexmark C750 | Service Manual - Page 53
5060-00x Sub error code 2D 3E 2D 3F 2D 40 2D 41 2D 42 2D 43 2D 44 2D 45 2D 46 2D 47 2D page complete. 5-Bin mailbox S1 broke early. 5-Bin mailbox S2 broke early. Output expander sensor broke early. Detected early break of fuser exit sensor. Finisher detected staple jam. Diagnostic information 2-19 - Lexmark C750 | Service Manual - Page 54
. • Clear some operator panel messages. • Resume printing after loading paper or clearing paper jams. • Exit Power Saver. If you have changed printer settings from the operator panel menus, press Go before sending a job to print. The printer must display Ready for jobs to print. 2-20 Service Manual - Lexmark C750 | Service Manual - Page 55
Job Buffering Window Size Transmit Printer Language Printer Usage Power Saver Resource Save Download Bits Parity Honor DSR PostScript Menu Print PS Error Font Priority Image Smoothing Color Menu Color Correction Manual Color Print Mode Print Resolution Toner Darkness Supplies Menu Toner - Lexmark C750 | Service Manual - Page 56
Lexmark C750 PostScript emulation or PCL drivers for Windows will override other selections. Color* Black & White US CMYK, Euro CMYK*, Vivid, Vivid CMYK, Off Vivid Off CMYK Display Manual Color To let users customize color correction output from the operator panel. RGB Image 2-22 Service Manual - Lexmark C750 | Service Manual - Page 57
4 to conserve toner. A vertical bar ( | ) indicates the factory default value. An arrow symbol ( V ) indicates a user default value. Toner Darkness To lighten or darken text images, or conserve toner. 1-5 (4*) Utilities Menu Menu Item Color Adjust Purpose To manually relinearize the color tables - Lexmark C750 | Service Manual - Page 58
the flash memory. Warning: Do not turn off the printer while the flash is formatting. Yes No Hex Trace To help isolate the source of a print job problem. With Hex Trace selected, all data sent to the printer is printed in hexadecimal and character representation. Control codes are not executed - Lexmark C750 | Service Manual - Page 59
. Use the "Sub error code table" on page 2-17 to help diagnose paper jam problems. 2xx code 200 Primary message Paper Jam Clear Paper Path (Jam location information) Secondary message Leave sheets in Finisher area 5 Description Primary: Paper is jammed at the printer input sensor. Open the - Lexmark C750 | Service Manual - Page 60
code 203 Primary message Paper Jam Clear paper Path Secondary message Leave job in Finisher Description Primary: The media is jammed due to a transparency sensor mismatch. Open the printer printer printer printer problem the printer will printer alternately problem the printer will printer problem the printer will - Lexmark C750 | Service Manual - Page 61
5060-00x 2xx code 251 Primary message Paper Jam Clear Paper Path Go to "Autocompensator service check" on page 2- have been accumulated to be stapled or offset when the jam occurred, the printer alternately flashes the primary and secondary messages to indicate that all accumulated sheets not - Lexmark C750 | Service Manual - Page 62
printer input sensor. Open the printers printer removed the printer will not the fuser. Open the printer left door printer removed the printer will not the fuser. Open the printer right door printer removed the printer will not the printer left door to access printer removed the printer will not - Lexmark C750 | Service Manual - Page 63
the accumulated sheets should not be removed during jam clearing. Note: When the secondary message is displayed, if the accumulated sheets are removed the printer will not reprint these sheets. Also if the print job is completed, the portion of the job printed after the jam will not be stapled - Lexmark C750 | Service Manual - Page 64
283 Errors. Setup Required This message is displayed when the printer has detected at POST, that packing material is still installed and must be removed. The user should verify that the machine is properly setup. Press Go and Reflash Code. A Alignment =x.x* This message is displayed when an ITU - Lexmark C750 | Service Manual - Page 65
10. Exit Configuration Menu. Change Cartridge Invalid Refill This message is displayed when the printer has detected a refilled Lexmark Return Program cartridge. can be black, cyan, magenta, or yellow. Remove the toner cartridge and install a new cartridge. Note: The user receives - Lexmark C750 | Service Manual - Page 66
printer with the option removed. If the problem continues, turn the printer off and back on. If the message continues to be displayed, turn the printer off, remove the option and call for service printer has detected that there are errors on is on and the code has determined that the Service Manual - Lexmark C750 | Service Manual - Page 67
error has occurred during the printer printer resumes printing. Insert Staple Cartridge This message is displayed when the staple cartridge is missing cartridge or • Press Go to ignore this message. The printer now handles staple jobs as if the staple unit Printer • Reset Active Bin • Check Supply - Lexmark C750 | Service Manual - Page 68
Cart Missing 30 Magenta Toner Cart Missing 30 Cyan Toner Cart Missing 30 Black Toner Cart Missing This message is displayed when the printer is missing the yellow, magenta, cyan, or black toner cartridge. Open the front cover, insert the toner cartridge, and close the cover. 2-34 Service Manual - Lexmark C750 | Service Manual - Page 69
cartridge installed. This message is displayed when the printer detects a calibration error for a particular color. This message displayed when the printer the Busy/Waiting Menu: • Cancel Job • Reset Printer • Reset Active Bin • Check Supply Levels Note: Menu Lockout does NOT prevent access to the - Lexmark C750 | Service Manual - Page 70
fix the problem. Press Go to clear the error. If the Service Printer message is displayed it means that a TPS failure has most likely occurred. The printer continues to operate but the color quality degrades. The most probable cause for this error message is a defective print cartridge or ITU. 37 - Lexmark C750 | Service Manual - Page 71
RAM Simplify your print job Install additional memory Press Go to clear the message, however some data may be lost • Press Menu to access the Busy/Waiting Menu The following functions may be available. • Cancel Job • Reset Printer • Reset Active Bin • Check Supply Levels Note: Menu Lockout does NOT - Lexmark C750 | Service Manual - Page 72
continue processing the print job. Note: If the print job does not print correctly, make sure that the correct cable is being used. If you still have a problem go to Serial Port Service Check. 54 Std Network Software Error 54 Network x Software Error 54 Serial Option x Error 2-38 Service Manual - Lexmark C750 | Service Manual - Page 73
Bin • Check Supply Levels Note: Menu Lockout does NOT prevent access to the Busy/ Waiting Menu. 56 Std Parallel Port Disabled 56 Parallel Port x Disabled These messages may appear when data is sent to the printer across a parallel port, but the port is disabled. Note: Once the error is displayed - Lexmark C750 | Service Manual - Page 74
printer detects a defective disk. This error may occur at power downloaded printer detects an unformatted disk at POST. Press Go to clear the message. The disk is marked as bad and normal operation continues, however disk operation is not allowed until the disk is formatted. 2-40 Service Manual - Lexmark C750 | Service Manual - Page 75
continues, however disk operations is not allowed until the disk is formatted. 80 Fuser Maintenance 83 ITU Maintenance 81 Engine Code CRC Failure These messages are displayed when the printer requires replacement of some worn assemblies. These messages are independently posted when either the - Lexmark C750 | Service Manual - Page 76
Service checks 100 ITU Error A 100 ITU error indicates that the printer did not detect the ITU belt home sensor. Before proceeding with this service check make sure that the Second Transfer Roll is correctly installed. After you reinstall the Second Transfer Roll, check to see if a 100 ITU error - Lexmark C750 | Service Manual - Page 77
are located on the side of the ITU handle assembly. Are the cables seated correctly? Yes Go to step 7 No Reinstall the cables correctly. Recheck for a 100 ITU error. If 100 ITU is displayed, go to step 11. Position the shield on top of the belt 7 The front contamination shield is attached to - Lexmark C750 | Service Manual - Page 78
Replace the ITU autoconnect cable 14 Check continuity of the ITU autoconnect cable. Is there continuity? Replace the following FRUs in the order shown: 1. ITU assembly. See "ITU assembly removal" on page 4-37 2. Engine board. See "Engine board removal" on page 4-29 120 Error code An incorrect - Lexmark C750 | Service Manual - Page 79
assembly. Yes Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. No Replace the fuser assembly. See "Fuser assembly removal" on page 4-31. Is there continuity? 121 Error code An incorrect fuser backup roll lamp is installed. CAUTION: Make sure the lamp is - Lexmark C750 | Service Manual - Page 80
assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. 3. Engine board. See "Engine board removal" on page 4-29. 124 Error code Hot fuser The printer detects a problem with the fuser running over temperature or the hot roll fuser lamp has been on too long. A problem may exist in the - Lexmark C750 | Service Manual - Page 81
5060-00x 125 Error code Hot fuser The printer detects a problem with the fuser running over temperature or the backup rolls have been on too long. A problem could exist in the fuser assembly with the backup roll bearings, backup roll thermistor, or other backup roll parts. The LVPS or engine board - Lexmark C750 | Service Manual - Page 82
the LVPS. See "Low voltage power supply (LVPS) removal" on page 4-38. Yes Go to step 2 No Replace the engine board. See "Engine board removal" on page 4-29. 128 Error code Fuser hot roll is under temperature during standby. Step 1 Action and questions Turn the printer on to allow it to reach - Lexmark C750 | Service Manual - Page 83
5060-00x 129 Error code The fuser backup roll is under temperature during standby. Replace the fuser top duct. See "Fuser top duct removal" on page 4-34. Step 1 Action and questions Turn the printer on and allow it to reach Ready. Note: The printer may not complete POR and continue to display the - Lexmark C750 | Service Manual - Page 84
on pin 6 of the fuser DC control connector. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Replace the fuser assembly. See "Fuser assembly removal" on page 4-31. Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. 2-50 Service Manual - Lexmark C750 | Service Manual - Page 85
131 Error code The fuser backup roll does not reach the correct standby temperature. Step 1 Action and questions Measure the voltage on connector J10-12 on the engine board. See "Engine board" on page 5-7 for the location of the connector. The voltage should measure approximately +0.13 V dc to 0.64 - Lexmark C750 | Service Manual - Page 86
the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. 132 Error code Cold fuser hot roll Step 1 Action and questions Measure the voltage on connector J10-11 on the engine board. The voltage should measure approximately +0.13 V dc to 0.64 V dc as the hot roll lamp turns - Lexmark C750 | Service Manual - Page 87
the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. 133 Error code Cold fuser backup roll Step 1 Action and questions Measure the voltage on connector J10-12 on the engine board. The voltage should measure approximately +0.13 V dc to +0.64 V dc as the backup roll lamp - Lexmark C750 | Service Manual - Page 88
. See "Low voltage power supply (LVPS) removal" on page 4-38. 134 Error code Hot fuser The fuser is running over temperature or the hot roll fuser lamp has been on too long. Error code 134 may also indicate a problem in the fuser assembly with the hot roll fuser bearings, hot roll thermistor - Lexmark C750 | Service Manual - Page 89
5060-00x 135 Error code Hot fuser The fuser assembly is running over temperature or the backup roll fuser lamp has been on too long. Error 135 may also indicate a problem in the fuser assembly with the backup roll fuser bearings, back up roll thermistor, LVPS, or engine board. Step 1 Action and - Lexmark C750 | Service Manual - Page 90
removal" on page 4-29. Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. Install the cable correctly. 5 Remove the fuser from the printer. Measure the voltage at the DC fuser control connector, pins 2 and 9. The voltage should measure approximately +5 V dc. Is - Lexmark C750 | Service Manual - Page 91
5060-00x 148 Error code Step 1 Action and questions Connector J64 on the engine board-check for correct installation of the ITU drive motor cable from the ITU drive motor to the engine board connector J64. Is the cable connected correctly? 2 ITU drive motor-check for continuity between pin 4 of - Lexmark C750 | Service Manual - Page 92
? 5 Replace the engine board. Does this fix the problem? Problem solved Call your next level support Problem solved Go to step 4 Replace the black cartridge assembly cable Go to step 5 Go to step 3 Install the cable correctly Yes Go to step 2 No Install the cable correctly 2-58 Service Manual - Lexmark C750 | Service Manual - Page 93
Does this fix the problem? Problem solved Call your next level support Problem solved Go to step 4 Replace the magenta cartridge assembly cable Go to step 5 Go to step 3 Install the cable correctly Yes Go to step 2 No Install the cable correctly 152 Error code Cyan cartridge drive assembly The cyan - Lexmark C750 | Service Manual - Page 94
? 5 Replace the engine board. Does this fix the problem? Problem solved Call your next level support Problem solved Go to step 4 Replace the yellow cartridge assembly cable Go to step 5 Go to step 3 Install the cable correctly Yes Go to step 2 No Install the cable correctly 2-60 Service Manual - Lexmark C750 | Service Manual - Page 95
5060-00x 154 Error code ITU belt motor Step 1 Action and questions Connector J64 on the engine board-check for correct installation of the ITU drive motor cable from the ITU drive motor to the engine board connector J64. Is the cable connected correctly? 2 ITU drive motor-check for continuity - Lexmark C750 | Service Manual - Page 96
? 5 Replace the engine board. Does this fix the problem? Problem solved Call your next level support Go to step 4 Replace the black cartridge assembly cable Go to step 5 Go to step 3 Install the cable correctly Yes Go to step 2 No Install the cable correctly 4 Problem solved 2-62 Service Manual - Lexmark C750 | Service Manual - Page 97
is not performed, error code 168 is displayed. Step 1 Actions and questions Check the magenta cartridge drive motor cable connection to J47 on the engine board. Is the cable installed correctly? 2 Check the magenta cartridge drive motor cable connection to the magenta cartridge drive motor card - Lexmark C750 | Service Manual - Page 98
this fix the problem? Problem solved Call your next level support Problem solved Go to step 4 Replace the cyan cartridge assembly cable Go to step 5 Go go step 3 Install the cable correctly Yes Go to step 2 No Install the cable correctly 159 Error code Yellow cartridge drive assembly The yellow - Lexmark C750 | Service Manual - Page 99
drive assembly removal" on page 4-33. Note: Anytime the fuser drive assembly is replaced, perform the "Motor Detect" on page 3-16. Does error code 161 continue? Yes Call your next level support No Problem solved 162 Error code Black cartridge drive assembly An incorrect motor is detected. Note: Any - Lexmark C750 | Service Manual - Page 100
Cartridge drive assembly removal" on page 4-26. Perform the "Motor Detect" on page 3-16. Does the printer display error code 165? 2 Reflash the NVRAM on the engine board. Does error code 165 continue? Call your next level support Problem solved Yes Go to step 2 No Problem solved 2-66 Service Manual - Lexmark C750 | Service Manual - Page 101
error code. 2. Compare the sub error code to the list below and go to the appropriate service check. Sub error code Service 2D 1C-Narrow media sensor obstructed Note: See "Printer sensors" on page 5-3. Step 1 Action and Problem solved No Go to step 2 2 Go to step 3 6 Replace the cables. Problem - Lexmark C750 | Service Manual - Page 102
03-S2 sensor late Note: See "Printer sensors" on page 5-3. Step 1 Action and questions Check the tray for proper edge guide setting and media loading. Edge guides should be adjusted against edge of path. Call your next level of support Yes Go to step 2 No Properly load media. 2-68 Service Manual - Lexmark C750 | Service Manual - Page 103
in time Note: See "Printer sensors" on page 5-3. guide setting and media loading. Edge guides should ITU and check for the jam at the second transfer roll. Is paper jammed at the second transfer roll? Clear the jam. Call your next level of support or replace damaged parts. Problem solved? Go to - Lexmark C750 | Service Manual - Page 104
Step 1 Action and questions Make sure the media installed in the tray meets specifications. Note: The HCIT only supports paper. Does the media meet specifications? 2 Does the media feed correctly from tray 1? Go to step pass thru obstructed or damaged? Clear the obstruction. 2-70 Service Manual - Lexmark C750 | Service Manual - Page 105
1 Action and questions Remove fuser from printer, remove oiler housing from fuser, and pivot the paper guide up. Is paper jammed inside the fuser? 2 Check fuser entry guide for toner buildup. Is toner built up on the fuser entry guide? Replace the fuser. See "Fuser assembly removal" on page 4-31 - Lexmark C750 | Service Manual - Page 106
fuser drive assembly drive gear to the vacuum transport operating correctly? Go to step 7 7 See if the paper is laying flat on the vacuum transport belts. Is the paper laying flat on the vacuum transport belts as it passes through the printer? Contact your next level support 2-72 Service Manual - Lexmark C750 | Service Manual - Page 107
fuser from the printer. Remove the oiler housing from the fuser, and pivot the paper guide up. Is media jammed inside the fuser? 2 Check fuser engine board. 2. Replace the fuser. See "Fuser assembly removal" on page 4-31. 3. Replace the LVPS. See "Low voltage power supply (LVPS) removal" on page - Lexmark C750 | Service Manual - Page 108
of the redrive. Are both belts in good condition and properly installed occurred at duplex entry edge guide. Did the jam occur at the duplex entry edge guide? Replace the duplex option. printer. • Verify the printer top cover is properly seated. Call your next level of support. 2-74 Service Manual - Lexmark C750 | Service Manual - Page 109
type of problem check the "Sub error code table" on page 2-17. They can help isolate the problem. 202 Paper Jam messages can also occur prior to the output expander pass thru sensor. Step 1 Actions and questions Check of mechanical drive components: • Check the output expander drive belt to make - Lexmark C750 | Service Manual - Page 110
and check that the diverter operates freely. Does the diverter operate freely? Go to step 5 Replace the fuser assembly. See "Fuser assembly removal" on page 4-31. Replace the redrive door. See "Redrive door removal" on page . Go to step 8 Repair the actuator link. Go to step 7 2-76 Service Manual - Lexmark C750 | Service Manual - Page 111
cables. 24x Paper jam Printer configuration and 24x paper jam codes Paper jam code 241 242 243 244 Tray identification Tray 1 Tray 2 Tray 3 Tray 4 Problem 2000-sheet option? Is a 24x paper jam error message displayed? Yes Go to step 2 Go tray (HCIT) 2000sheet option service check" on page 2-128. - Lexmark C750 | Service Manual - Page 112
the cable correctly 12 Check the base door assembly, paper guide, wall support plate and door spring for damaged parts, warped parts or obstructions that might cause the paper to jam over the pass thru sensor. Did you find any problems with these parts? Repair or replace parts as necessary - Lexmark C750 | Service Manual - Page 113
system board LED error code table" on page 2-128 to further isolate paper jam or sensor problem. Before proceeding with this service check make sure : 1. HCIT system board 2. Feed unit assembly Install the cable correctly. 8 Use the "HCIT system board LED error code table" on page 2-128. Does - Lexmark C750 | Service Manual - Page 114
feeding operation test to determine where the paper jams. Use the "HCIT system board LED error code table" on page 2-128 to help isolate problems in the feed unit assembly. Are you able to determine where the failure is occurring? Repair or replace parts as necessary. 2-80 Service Manual - Lexmark C750 | Service Manual - Page 115
5060-00x Printer configuration diagrams for 24x paper jams Diagnostic information 2-81 - Lexmark C750 | Service Manual - Page 116
Inform user that the media in the MPF does not meet specifications. Go to "Tray 1 service check" on page 2-149. Correct the Paper Type setting. Properly load the media. 2 Does " on page 7-21. Call your next level of support. 8 Does media jam on the friction buckler? Replace the friction buckler. See " - Lexmark C750 | Service Manual - Page 117
Enter the Diagnostics Menu. Select Input Tray Tests, Sensor Test, and Multipurpose Feeder. Manually actuate the MP sensor by moving the paper flag in the MPF. Does the test pass? 2 Make sure that the MPF sensor cable from the engine board is correctly installed at J70 on the engine board. Is the - Lexmark C750 | Service Manual - Page 118
service check run the Output Bin x Sensor Test and check for the failing sensor. Sensor tests: XNF F P Step 1 Near Full (Upper part of sensor assembly) Full (Lower part of sensor assembly) Pass Thru Sensor Yes Go to step 2 No Install the cable linkage assembly. Go to step 4 2-84 Service Manual - Lexmark C750 | Service Manual - Page 119
pass thru sensor flag-make sure the flag is operating correctly and is not binding, broken, and there is no interference from the sensor cable. Is there any problem found with the sensor flag? 2 Bottom pass thru sensor-make sure the sensor is correctly connected to J5 on the control board. Is - Lexmark C750 | Service Manual - Page 120
-check the top sensor flag for correct operation, binding, broken parts or interference from the sensor cable. Are there any problem with the sensor flag? 2 Top pass thru sensor-make sure the control board Go to step 3 Reseat the cable Yes Repair as necessary No Go to step 2 2-86 Service Manual - Lexmark C750 | Service Manual - Page 121
printer and to diagnose a 280 Paper Jam. Check the area indicated to find the jam and the problem. If this does not fix the problem, contact the next level ow support failure. Belt motor homing timeout error. Paper jam in accumulator, motor or sensor failure. Tray elevation motor timeout error. Stuck - Lexmark C750 | Service Manual - Page 122
the lever above the ITU handle. Do not remove the ITU assembly itself. Make sure the level is pressed firmly in place. Turn the printer on. Yes Go to step 2 No Problem resolved Does the 900 error display? 2 Disconnect the printer from any external connections. Turn the power off and remove any - Lexmark C750 | Service Manual - Page 123
Network Menu, and USB Menu. All downloaded resources (fonts, macros, and symbol sets) in printer memory (RAM) are deleted. (Resources residing in flash memory or on the hard disk are unaffected.) Yes Record the secondary error codes. With the 900 Service RIP Error displayed, press Select and Return - Lexmark C750 | Service Manual - Page 124
5060-00x 925 Error code Fuser fan Step 1 Actions and questions Turn the power off and manually spin the fan and check that it rotates freely. Does the fan rotate freely? 2 Check the fuser fan cable connection to the engine board, J2 for correct installation. Is the cable installed correctly? 3 - Lexmark C750 | Service Manual - Page 125
dc 0V 0 V dc +24 V dc Are the voltages correct? 927 Error code RIP fan Step 1 Actions and questions Turn the power off and manually spin the fan and check that it rotates freely. Does the fan rotate freely? 2 Check the RIP fan cable connection to the engine board, J53 for correct installation. Is - Lexmark C750 | Service Manual - Page 126
(LVPS) removal" on page 4-38 2. Engine board. See "Engine board removal" on page 4-29 Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38 Problem solved Yes Go to step 2 No Install the cable correctly 3 Is error code 930 still displayed? 2-92 Service Manual - Lexmark C750 | Service Manual - Page 127
5060-00x 940 Error code Cyan toner metering cycle (TMC) Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed. - Lexmark C750 | Service Manual - Page 128
HVPS. Make sure the screws that mount the power supply are properly tightened and the board is positioned and printer to see if a 940 error is still displayed. Correctly connect the cable. 6 Make sure the developer HVPS cable is correctly installed on the developer board assembly. Is the cable - Lexmark C750 | Service Manual - Page 129
-00x 941 Error code Magenta toner metering cycle (TMC) Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed - Lexmark C750 | Service Manual - Page 130
HVPS. Make sure the screws that mount the power supply are properly tightened and the board is positioned and printer to see if a 941 error is still displayed. Correctly connect the cable. 6 Make sure the developer HVPS cable is correctly installed on the developer board assembly. Is the cable - Lexmark C750 | Service Manual - Page 131
5060-00x 942 Error code Yellow toner metering cycle (TMC) Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed - Lexmark C750 | Service Manual - Page 132
HVPS. Make sure the screws that mount the power supply are properly tightened and the board is positioned and printer to see if a 942 Error is still displayed. Correctly connect the cable. 6 Make sure the developer HVPS cable is correctly installed on the developer board assembly. Is the cable - Lexmark C750 | Service Manual - Page 133
5060-00x 943 Error code Black toner metering cycle (TMC) Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed. - Lexmark C750 | Service Manual - Page 134
HVPS. Make sure the screws that mount the power supply are properly tightened and the board is positioned and printer to see if a 943 error is still displayed. Correctly connect the cable. 6 Make sure the developer HVPS cable is correctly installed on the developer board assembly. Is the cable - Lexmark C750 | Service Manual - Page 135
5060-00x 990 Service error This error indicates which option is causing the error. 5-Bin mailbox Step 1 Action and questions Mechanical linkage/DC motor assembly-make sure the DC motor cable connector is installed at J2 on the control board. Is the cable connected correctly? 2 Resistance check- - Lexmark C750 | Service Manual - Page 136
Error - Tray x, x=Tray 2, 3, 4 or 5, this is the tray that has a problem or needs service. Note: Verify the autoconnect housing is correctly snapped into the printer and all options, and is plugged into the system board correctly. Step 1 Action and questions Make sure the autocompensator cable - Lexmark C750 | Service Manual - Page 137
installed on top of the printer. Is the cable correctly installed? 3 Make sure the finisher cable is correctly installed on the finisher system board. Is the cable correctly installed? 4 When 990 error is installed, press and hold Return and Select to view the sub error code. Scroll down with Menu - Lexmark C750 | Service Manual - Page 138
5-Bin mailbox option service check Note: Make sure the option(s) are installed correctly and the printer is configured correctly. The majority of the mechanical components can be observed during operation by removing the left and right side covers. Step 1 2 Symptoms Problems with excessive static - Lexmark C750 | Service Manual - Page 139
10 Symptoms 990 Service Error Yes Go to "990 Service error" on page 2-101 No Call your next level support The printer does not recognize one or more output options as installed. Note: If more than a single output option is installed, check each one to see if the printer recognizes any single - Lexmark C750 | Service Manual - Page 140
the deflector or deflector cover, broken or binding shaft assemblies, or broken gear teeth. Are parts broken, loose, binding, or missing? 2 Bin x solenoid-check the solenoid for any binds or sticking problems. Is the solenoid binding or sticking? 3 Bin x solenoid-check the resistance of the solenoid - Lexmark C750 | Service Manual - Page 141
-check the Bin x sensor flag for binding and proper operation. Are there any problems with the sensor flag? 4 Bin x sensor cable-check the continuity of the sensor cable. Is there continuity? Replace the Bin x sensor Replace the Bin x cable Repair or replace the sensor flag Go to step 4 Go to step - Lexmark C750 | Service Manual - Page 142
service printer does cable to J5 installed correctly? 4 Autoconnect cables-check the autoconnect from the printer or option above tray x. Check for cuts, pinched wiring, or damage to the contacts in the connector. Are there any problems with the autoconnect cables? 5 Tray x autoconnect cable cables - Lexmark C750 | Service Manual - Page 143
down position. Remove the tray and manually reset the autocompensator to its uppermost parts loose, broken or missing? Repair or replace as necessary Call your next level of support. Go to step 4 Install the bellcrank correctly Problem solved Go to step 3 Yes Go to step 2 No Go to step 3 The printer - Lexmark C750 | Service Manual - Page 144
parts: problem continues, replace the paper leveling sensing assembly. If this does not fix the problem cable to make sure the in-line connector is correctly installed to Tray x system board cable. Is the cable correctly installed? Go to step 4 Install the cable correctly 2-110 Service Manual - Lexmark C750 | Service Manual - Page 145
on page 4-17. 2. Electronics/size sensing assembly No Install the cable correctly Tray x does not detect size media is installed Step 1 any signs of damaged or broken parts. Are there broken or damaged parts? Yes Go to step 2 Repair or replace defective parts Replace the paper size sensing - Lexmark C750 | Service Manual - Page 146
board turned on? Yes Go to "AC power service check" on page 2-112. No Go to "DC power service check" on page 2-113. AC power service check The printer appears to be inoperative when turned on with the Power on/Status LED off, the LCD display is blank, the Fuser lamps do not come on and no motors - Lexmark C750 | Service Manual - Page 147
and questions Does the printer beep 5 times and the operator panel display all diamonds? Yes Go to "Operator panel LCD/status LED/buttons service check" on page 2-132. Go to step 3 No Go to step 2 2 DC power to engine board-turn the power off and disconnect the LVPS cable to J9 on the engine - Lexmark C750 | Service Manual - Page 148
step until the original DC power problem occurs. Does the DC power problem occur? Check the cable and component that was last connected to system board for a problem such as a short. If printer comes to Ready, connect the remaining cables and print. Autocompensator service check If the paper - Lexmark C750 | Service Manual - Page 149
the tray. Is there any damage to the tray? 2 Check the following parts for damaged, loose or missing parts. • Pick arm lift bellcrank • Bellcrank lift spring • Tray interlock bellcrank Are any of the parts broken, loose or missing? 3 Verify the autocompensator is not stuck in the up position (tires - Lexmark C750 | Service Manual - Page 150
level sensor inside the printer. The paper level parts loose or broken? 3 Check the paper level sensing cable cable level sensing cable. Is there cable correctly Repair or replace parts as necessary. Go to step 3 Yes Call your next level support. No Go to step 2 Replace the level sensing cable parts: - Lexmark C750 | Service Manual - Page 151
does not correct the problem, replace the engine board. See "Engine board removal" on page 4-29. No Replace the cable Black only retract (BOR) service check Step 1 Action and questions Manual check of BOR system- Remove the print cartridges. Observe the ITU belt as you manually rotate the BOR gear - Lexmark C750 | Service Manual - Page 152
on the front access door support and with the left switch mounted in the ITU light shield. Note: When the printer is powered on for some time with this symptom displayed, the printer may then display a 902 Service Error. Step 1 Action and questions Make sure that the ITU light shield is not out of - Lexmark C750 | Service Manual - Page 153
POR complete, printer feeds blank page This symptom is usually associated with the Upper switch mounted on the Front Access Door Support and with the right switch mounted in the ITU Light Shield. Step 1 Action and questions Make sure that the ITU light shield is not broken. Is the ITU light shield - Lexmark C750 | Service Manual - Page 154
beneath the printer. Try to isolate which of the options is causing the problem. Go to step 4 No Go to step 2 Go to step 3 3 Make sure the duplex option is correctly installed. Is the duplex option installed correctly? Install the duplex option correctly Install the cable correctly 4 Make - Lexmark C750 | Service Manual - Page 155
values. Connector pin Voltage J5-1 J5-3 J5-5 J5-6 J5-8 +24 V dc +5 V dc +5 V dc +5 V dc +5 V dc Yes Go to step 8 No Replace the bottom options cable in the printer Are the voltages correct? 8 Make sure the upper options cable in the duplex option is installed correctly in the duplex frame. Is the - Lexmark C750 | Service Manual - Page 156
detected for the jogger motor Error detected for the punch motor Error detected for the stapler motor Error detected for the belt motor Error detected for the tray motor HCOF detects the front door is open Error detected with the communications to the printer Error detected for the offset motor - Lexmark C750 | Service Manual - Page 157
the finisher system board. Replace the cable. Finisher is totally inoperative, no motor movement, no LEDs on This problem can be caused by a problem with the autoconnect system between the finisher and the printer. It also can be caused by a problem with the power system in the finisher. Step - Lexmark C750 | Service Manual - Page 158
: The relay on the relay board is connected to +5 V dc from the printer through the communications cable. When the printer is powered on, +5 V dc is sent to the finisher relay board relay coil which approximately +5 V dc. Is the voltage correct? Replace the top options cable 2-124 Service Manual - Lexmark C750 | Service Manual - Page 159
). Is the front door and door activating tab damaged, broken or missing? 3 Check the front door magnetic latches to make sure the front door closes correctly. Are the magnetic latches functioning properly? 4 Check the front door switch cable connection to CN11 on the finisher system board. Is the - Lexmark C750 | Service Manual - Page 160
HCOF error code table" on page 2-122 to help diagnose the problem. Step 1 Action and questions Make sure the chad box is correctly installed in the finisher. Is the chad box correctly installed. 2 Make sure the chad box cable Yes Go to step 2 No Install the chad box correctly. 2-126 Service Manual - Lexmark C750 | Service Manual - Page 161
129, 130, 131, 132, or 133 is displayed, the printer detects a problem in the fuser hot roll or back up roll fuser lamp circuits, fuser hot roll thermistor, back up roll thermistor, engine board or LVPS fuser control circuits. Hot fuser service Error codes 124, 125, 134, and 135 appear whenever the - Lexmark C750 | Service Manual - Page 162
) 2000-sheet option service check HCIT system board LED error code table If a failure is detected by the system board, an error code may be displayed. If the system board LED is on solid, the HCIT detects that the tray or side door is not closed. The LED on the system board may blink. Count the - Lexmark C750 | Service Manual - Page 163
the autoconnect from the printer or option above the HCIT 2000-sheet option. Check for any signs of cuts, pinched wiring or damage to the contacts in the connector. Are there any problems with the autoconnect cables? 6 HCIT autoconnect cable-check the HCIT autoconnect cable for correct installation - Lexmark C750 | Service Manual - Page 164
the HCIT system board. Step 1 2 Action and questions Does the printer power up and work normally when plugged into the AC outlet on the HCIT? is blinking, replace the HCIT system board Replace the HCIT system board No Go to step 5 Go to step 3 Go to step 4 Replace the cables 2-130 Service Manual - Lexmark C750 | Service Manual - Page 165
the paper size sensor flag for sticking or broken parts. Is the paper size sensor flag sticking or broken? Go to step 6 6 Check continuity of the sensor cable. Do you measure continuity? Replace the sensor. If this does not fix the problem, replace the HCIT system board. Replace the sensor - Lexmark C750 | Service Manual - Page 166
operate correctly, the LCD display is blank, Power On Status LED is on, and the printer beeps 5 times, go step B. Yes Replace the operator panel. See "Operator panel removal" on page 4-46 No Test passes. No problem found Step B Note: Make sure the operator panel cable is seated firmly in J1 on the - Lexmark C750 | Service Manual - Page 167
step 13 Go to "Operator panel removal" on page 4-46 and replace the operator panel cable Call your next level support Go to step 14 12 Operator panel assembly-does the operator panel display all diamonds, with the power on/status LED on and 5 beeps? Voltage checks at RIP connector J1. See "RIP - Lexmark C750 | Service Manual - Page 168
before attempting to service the unit. Step 1 Symptoms The printer does not recognize one no indication that Bin x is near full." on page 2-135 Go to "990 Service error" on page 2-101 Go to step 4 4 271 Paper Jam - Check Bin 990 Service - bin x Call your next level support 2-134 Service Manual - Lexmark C750 | Service Manual - Page 169
power off and remove the output expander option from the printer and check the voltages on the base printer top autoconnect connector. Go to Autoconnect - Top. Are the voltages correct? Go to step 6 The problem is in the base printer. Check autoconnects in the printer. Go to step 5 Reseat the cables - Lexmark C750 | Service Manual - Page 170
to help isolate the problem. An incorrect printer driver for the installed software, can cause print quality problems. Incorrect characters could print and the copy may not fit the page correctly. Note: Some 201 Paper Jam errors can be caused by a faulty print cartridge. 2-136 Service Manual - Lexmark C750 | Service Manual - Page 171
assembly. See "Cartridge contact assembly removal" on page 4-23. Go to step 4 No Go to step 2 Go to step 3 3 Reseat the ITU. Do the marks/lines persist? Problem solved 4 Does the printer display an 83 ITU Maintenance message? Recommend the customer order the ITU maintenance kit. See "Scheduled - Lexmark C750 | Service Manual - Page 172
cartridge • ITU assembly. See "ITU assembly removal" on page 4-37. 3 Vertical streaks in a single color, which are visible outside the printed, are most likely caused by a cleaner problem in the print cartridge. Are streaks magenta, cyan, or yellow Replace the cartridge. Light lines or streaks - Lexmark C750 | Service Manual - Page 173
support Blank page (no image) • If there is no image (blank page) and no error codes displayed, go to step 1. • If there is no image (blank page) but error codes are displayed, go to "Sub error code table" on page 2-17 and perform the necessary action. Step 1 Action and questions Second transfer - Lexmark C750 | Service Manual - Page 174
a piece of paper, block the laser path between the printhead and cartridge for the color that is experiencing the full bleed issue. Turn the printer off. Check the cable connections between the printhead and the system board. Do you continue to have the same problem? 3 Use the "Printhead diagnostics - Lexmark C750 | Service Manual - Page 175
Print Test" on page 3-5. Is the image well developed on the PC drum but the same plane is missing or faded on the ITU belt? 4 Turn off the printer. Check the cable connections between the transfer HVPS board and the system board. Do you continue to have the same problem? 5 Check continuity on the - Lexmark C750 | Service Manual - Page 176
the cable between the rear second transfer roll arm and the 1 lead on the transfer HVPS board. Go to step 3 Problem resolved Yes Go to step 2 No Problem resolved 3 Replace the "Transfer HVPS board removal" on page 4-80. Check the connection at the second transfer roll arm. 2-142 Service Manual - Lexmark C750 | Service Manual - Page 177
print cartridge correctly and recheck Replace the "Transfer HVPS board" on page 4-81 Step B Step 1 Action and questions Make sure that color calibration has not been disabled in the Diagnostics menus, especially if the printer has been previously serviced. Was color calibration disabled? 2 Toner - Lexmark C750 | Service Manual - Page 178
for the color having the problem missing or unattached? Yes Replace the broken or missing bellcrank. Repair or replace the spring as necessary. No Got to step 2 Look for any signs of missing or damaged parts in the area of the color having the problem, including the ITU. 2-144 Service Manual - Lexmark C750 | Service Manual - Page 179
been replaced, advise the customer to install a new fuser CRU or a maintenance kit. If only one color has a residual image problem, go to "Horizontal lines or streaks" on page 2-137. Uneven printing • If all colors have uneven print, replace the ITU assembly. • The uneven print may appear as spots - Lexmark C750 | Service Manual - Page 180
- Set the fuser to High in the CE menu. Does setting the fuser to High fix the problem? Yes Set the printer for current media type and go to step 2 Problem solved Problem solved No Go to step 3 Go to step 3 Replace the fuser assembly. See "Fuser assembly removal" on page 4-31 2-146 Service Manual - Lexmark C750 | Service Manual - Page 181
colors appear when projected? Fuser settings - From the Diagnostics Menu select fuser settings and set to high. Does this fuser setting fix the problem? Go to step 3 Problem solved Go to step 4 Replace the fuser assembly. See "Fuser assembly removal" on page 4-31 Replace the second transfer roll - Lexmark C750 | Service Manual - Page 182
part of the maintenance kit and should be replaced when a "83 ITU Maintenance" message appears. Ask the customer if they have replaced the second transfer roll recently. Note: If any of the following problems occur, go to "Print quality service checks" on page 2-136: • A problem with only one color - Lexmark C750 | Service Manual - Page 183
correctly, not loose, or broken. Are there any problems with the transfer terminal contact, transfer cable connection, or ITU transfer bellcrank assemblies? Yes Repair or replace as necessary. If this does not correct the problem, contact your next level support. No Replace the FRUs in order - Lexmark C750 | Service Manual - Page 184
printer. Is the tray correctly installed? Yes Go to step 2 No Install Tray 1 correctly. If there is still a problem, go to "Tray 1 service check teeth broken or missing? Replace the Back Restraint Go to step 5 5 Check the following parts to make sure they parts as necessary 2-150 Service Manual - Lexmark C750 | Service Manual - Page 185
to identify problems with the printer. Diagnostic aids Printhead diagnostics If you get a printhead error, follow this diagnostic to find the specific failure. See "Printhead diagnostics" on page A-1 for a color version of this procedure. 1. Verify that all the printhead cables are properly - Lexmark C750 | Service Manual - Page 186
the printhead cables from the RIP board in the printer and connect them to the printhead diagnostic tool. c. Connect the printhead diagnostic tool cables to the connectors on the RIP board in the printer. This reverses the printhead color signals for the selected pair of colors. 3-2 Service Manual - Lexmark C750 | Service Manual - Page 187
. Press Go to clear the error. • If the error code remains the same, replace the RIP board. If that solves the problem, you are finished. • If the printer displays a different printhead error code, which indicates another color, the printhead or the printhead cables are defective. See the table - Lexmark C750 | Service Manual - Page 188
NIP distances mm Y-C-M-K cartridge spacing K to second transfer roll M to second transfer roll C to second transfer roll Y to second transfer roll Meter 1 to second transfer Meter 2 to second transfer Meter 3 to second transfer Meter 4 to second transfer Second transfer to fuser Fuser nip to first - Lexmark C750 | Service Manual - Page 189
procedure for missing or faded planes 1. 2. 3. 4. 5. 6. 7. Turn the printer off. Remove all cartridges and the ITU. Inspect the bellcranks. Enter the Configuration Menu. See "Entering CONFIG MENU" on page 3-7. Select Prt Quality Pgs and press Select. Open the vacuum transport belt (VTB) jam - Lexmark C750 | Service Manual - Page 190
See "Cartridge contact assembly removal" on page 4-23 • Developer HVPS cable - Make sure that there is no damage to the cable running from the system board. • Developer HVPS board. • System board. If the image is well developed on the PC drum, but the same plane is missing or faded on the ITU belt - Lexmark C750 | Service Manual - Page 191
PPDS Emulation - This only displays if the PPDS interpreter is available. Download Emuls - This only displays if at least one Downloaded Emulator is installed. Demo Mode Factory Defaults Energy Conserve ITU Alignment Auto Color Adj Error Log Exit Config Menu (Press Select to exit CONFIG MENU and - Lexmark C750 | Service Manual - Page 192
incremented by two when a duplex sheet is printed. The counter can be used to track printer usage. When the counter reaches 150,000, the printer posts a fuser maintenance message on the operator panel. 1. Select Reset Fuser Cnt from the CONFIG MENU to view the page count. 2. Press Return to return - Lexmark C750 | Service Manual - Page 193
, Colored paper, Custom Type 1, Custom Type 2, Custom Type 3, Custom Type 4, or Custom Type 6 CALIBRATE TRAYS Only trays that support transparency user-correctable NVRAM problem. The tray may not have been calibrated or the NVRAM variable for tray calibration may be missing. Diagnostic aids - Lexmark C750 | Service Manual - Page 194
. Select PPDS Emulation from the CONFIG MENU. =Activate =Deactivate* Download Emuls This only displays if at least one downloaded emulator is installed. Select Download Emuls from the CONFIG MENU. =Disable Demo Mode This printer supports a demo mode that is usually used in retail environments to - Lexmark C750 | Service Manual - Page 195
or the base printer settings to their factory default values. When Restore Base is selected, non-critical base printer NVRAM settings are that have integrated network support. Energy Conserve When Energy Conserve is on, the customer does not have access to disable the Power Saver function. When - Lexmark C750 | Service Manual - Page 196
or different color cartridge is installed, usually at power on or when the cover is closed. If the printer detects a new or different ITU is installed, usually at power on or when the cover is closed. If the fuser detects at power on that the fuser temperature is at 60° C. If Power Saver has been - Lexmark C750 | Service Manual - Page 197
TESTS (if finisher is installed) BASE SENSOR TEST DEVICE TESTS (if optional flash or disk installed) PRINTER SETUP EP SETUP ERROR LOG Exit Diagnostics Entering Diagnostics Mode To enter the Diagnostics Mode: 1. 2. 3. 4. Turn the printer off. Press and hold the Go and Return buttons. Turn the - Lexmark C750 | Service Manual - Page 198
to change is blinking. • To change the margin value press Menu . Print adjustment tip: Adjusting the Top and Right margins moves the entire image. Adjusting the Bottom and Left margins causes the image to expand or compress A4 paper. To exit the Registration menu, press Return. 3-14 Service Manual - Lexmark C750 | Service Manual - Page 199
move to the next value. The margin values blink in the following order: Top, Left, Right color alignment pages. The Alignment Test Page should be printed on A4 or Letter paper. The printer tries to print the test page from the default paper source, however if the default source only supports - Lexmark C750 | Service Manual - Page 200
test must be performed anytime the ITU motor, Fuser motor, or Cartridge drive motors are replaced. To run the Miscellaneous Tests: 1. 2. 3. 4. Select Misc Tests from the Diagnostics Mode. Select Motor Detect. Remove all the print cartridges from the printer. Press Go. Motor Detection in progress - Lexmark C750 | Service Manual - Page 201
. Refer to the instructions included with the shim for installation. After installing the shim, run the test, again. If the test fails, rerun several times as the belt needs time to stabilize. Once the test is successful, reinstall the cartridges and restart the printer. 2. 3. 4. Diagnostic aids - Lexmark C750 | Service Manual - Page 202
are available Print Quality Pages Print Line Len Pages Print Tests (input source) This test determines if the printer can print on media from any of the paper input sources. Each of the installed sources is available Stop at the end of the test to return to the original screen. 3-18 Service Manual - Lexmark C750 | Service Manual - Page 203
color blocks, color array scales, and color gradients. This test may be printed from either CONFIG MENU or the Diagnostics Menu. • When printed from the Configuration Menu, the toner cartridge in the printer NVRAM. When printed from the Diagnostics Test Menu, the toner cartridge lockout function - Lexmark C750 | Service Manual - Page 204
that each bit in memory can be set and read correctly. To run the DRAM Test: 1. Select DRAM Test from the menu. The power indicator blinks indicating the test errors. Initially 000000 is displayed. The maximum fall count is 999,999. To exit the test, turn the printer off. 2. 3-20 Service Manual - Lexmark C750 | Service Manual - Page 205
signal is tested. To run the Parallel Wrap Test: 1. Disconnect the parallel interface cable and install the wrap plug (P/N 1319128). 2. Select Parallel Wrap Test from the menu. The power indicator blinks indicating the test is in progress. The test runs continuously until canceled. Each time - Lexmark C750 | Service Manual - Page 206
the printer Error Data Error Data 232 Error Data 422 Error FIFO Error DSR Error DSR PIO Error DSR Interrupt Error CTS Error CTS PIO Error CTS Interrupt Error Once the maximum count is reached the test stops. The power indicator goes on solid and the final results are displayed. 3-22 Service Manual - Lexmark C750 | Service Manual - Page 207
printer attempts to print the Quick Test Page from the default paper source. If the default paper source only supports of a duplex sheet. Changing the value by 1 unit moves the margin by 1/100 inches. A positive Sensor Test from the DUPLEX TESTS menu. Manually actuate each of the duplex sensors. When - Lexmark C750 | Service Manual - Page 208
path as media is feeding through the printer. The upper front door, used to access the print cartridge, cannot be opened during the feed test since the laser isn't engaged during this test. Note: This test can run using any of the paper or envelope sizes supported by the printer. The Service Manual - Lexmark C750 | Service Manual - Page 209
=trays near empty sensor =trays paper level sensor =input trays side cover sensor 2. Manually actuate the bin sensor by moving the flag in and out of the sensor. OP you want the paper to exit into. All output bins installed on the printer are shown on 3. 4. the feed test menu. For example, Standard - Lexmark C750 | Service Manual - Page 210
are working correctly. The following Output options, if installed, are supported by this test. Standard Bin Output Expander 5-Bin Mailbox To run FL indicates the bin is full. 3. Once the selection is displayed you can manually actuate the sensor you want to test. When the sensor is closed (CL) - Lexmark C750 | Service Manual - Page 211
laser is not engaged during this test. This test cannot be canceled or terminated once the test has begun. When the test is complete the printer Sensor A =Punch Timing Sensor B Once this screen is displayed you can manually actuate each of the sensors. When the sensor is closed, CL is displayed, - Lexmark C750 | Service Manual - Page 212
used in the source tray for this test. No information is printed on the feed test pages since the laser is not energized during this test. Eight sheets of paper are fed and holes punched with a three hole Hole Punch. Press Return after the test is complete to exit the test. 3-28 Service Manual - Lexmark C750 | Service Manual - Page 213
- S2 In-Line media Sensor Fuser exit Sensr See "Printer sensors" on page 5-3 for locations for these sensors. See "Cartridge contact assembly pin locations" on Test from the Device Tests menu. • The power indicator blinks while the test is in progress. • Quick Disk Test/Test Passed displays if the - Lexmark C750 | Service Manual - Page 214
PPDS code page Universal units of measure US value Letter 10 Envelope Non-US value A4 DL Envelope Letter PC-8 437 Inches A4 PC-850 850 Millimeters Warning: Modification of the printer setting Defaults causes the NVRAM space to be restored to the printer's factory settings. 3-30 Service Manual - Lexmark C750 | Service Manual - Page 215
Press Return to return to the Printer Setup Menu. 4. Select a new test or select Exit Diagnostics from the Diagnostic Menu. Serial Number You can view the serial number. Engine Setting x Warning: Should not be changed without specific instructions from the next level support. Diagnostic aids 3-31 - Lexmark C750 | Service Manual - Page 216
the Printer Setup digit. The digit blinks. Continue modifying each Fuser Temp Warning: Should not be changed without specific instructions from the next level support. DC Charge Adjust Warning: Should not be changed without specific instructions from the next level support. 3-32 Service Manual - Lexmark C750 | Service Manual - Page 217
from the next level support. Transfer Adjust Warning: Should not be changed without specific instructions from the next level support. ERROR LOG View Log The error log provides a history of printer errors. The error log contains the 12 most recent errors. The most recent error appears in position - Lexmark C750 | Service Manual - Page 218
option or the base printer mounted above the optional HCIT. Note: During normal operation, the red LED on the HCIT system board blinks or flashes on for 2. 3. 4. 5. for the test you want to run. Turn the HCIT power off by moving the LVPS slide switch to the left position. Press and hold Service Manual - Lexmark C750 | Service Manual - Page 219
to electrostatic discharge (ESD). To prevent damage to ESD-sensitive parts, use the following instructions in addition to all the usual precautions, such as turning off power before removing logic boards: • Keep the ESD-sensitive part in its original shipping container (a special "ESD bag") until - Lexmark C750 | Service Manual - Page 220
Cartridge guides to upper frame Upper front cover to cartridge guides Front cover pivot to front upper cover Front left light cable to right front cover support and upper frame. Ground cable to bottom support plate and engine card shield Back lamp brackets to fuser frame Front lamp brackets to fuser - Lexmark C750 | Service Manual - Page 221
asm to upper front cover Top cover asm to RIP shield ITU light shield asm to upper front guide ITU Ribs to upper redrive door Upper door hinges to upper frame (redrive) Inner redrive asm to upper frame (redrive) Developer HVPS to cartridge contact asm Engine card shield to frame BOR drive asm to - Lexmark C750 | Service Manual - Page 222
Location ITU drive asm to lower frame Fuser drive asm to lower frame Vacuum top duct to lower frame Toner Transfer HVPS/RIP fan asm to RIP shield Front left light shield to left upper cover asm and top cover Front right light shield to right front cover support and top cover Cartridge Service Manual - Lexmark C750 | Service Manual - Page 223
CAUTION: Remove the power cord from the printer or electrical outlet before you connect or disconnect any cable or electronic board or assembly for personal safety and to prevent damage to the printer. Disconnect any connections between the printer and PCs/peripherals. The printer weighs 47.7 kg - Lexmark C750 | Service Manual - Page 224
5060-00x 4. Remove the operator panel bezel. 5. Remove the top cover mounting screws (D) from the front of the printer. 6. Remove the three top cover screws (E) type "323" on page 4-3 from the rear and the screw (F) from the left side of the printer. 4-6 Service Manual - Lexmark C750 | Service Manual - Page 225
5060-00x 7. Remove the flag retainer (G) from the top cover. 8. Under the top cover, unclip the bin full sensor (H). Tilt the sensor and lower it through the top cover. 9. Remove the upper option autoconnect (I). 10. Remove the top cover. Repair information 4-7 - Lexmark C750 | Service Manual - Page 226
4-8. 2. Remove the rear fan cover screw type "323" (A) and remove the rear fan cover. Rear cover removal See "Rear cover" on page 7-5 for the part number. 1. Remove the rear cover screw type "323" (A). 2. Open the MPF, remove the rear cover screw type "323" (B), and remove the rear cover. A(323 - Lexmark C750 | Service Manual - Page 227
See "Front right handle cover assembly" on page 7-3 for the part number. 1. Open the front cover. 2. Remove the light shield screw type "324" (A) and screw type "323" (B) and release tab (C) from the frame slot. 3. Remove the light shield. 4. Remove the front right handle cover assembly screw type - Lexmark C750 | Service Manual - Page 228
assembly removal See "Front left handle cover assembly" on page 7-3 for the part number. 1. Open the front cover. 2. Remove the front left handle cover cover assembly" on page 7-3 for the part number. 1. Open the front cover. 2. Remove the detent post tension spring (A). A 4-10 Service Manual - Lexmark C750 | Service Manual - Page 229
5060-00x 3. Remove the bezel (B). B 4. Hold the front cover and remove the two screws type "102" (C) from the upper front pivot cover. C(102) 5. Remove the front cover assembly. Repair information 4-11 - Lexmark C750 | Service Manual - Page 230
5060-00x Lower right door assembly removal See "Lower right door assembly" on page 7-3 for the part number. 1. Open the lower right door assembly. 2. Remove the front right handle cover assembly. See "Front of the door, unless you need to replace the paper path access door. 4-12 Service Manual - Lexmark C750 | Service Manual - Page 231
5060-00x 5. Loosen the two screws (C). 6. Remove the lower right door assembly. Left lower cover removal 1. Remove the lower jam access door assembly. See "Lower jam access door assembly removal" on page 4-14. 2. Remove the left lower cover screw type "323" (A) and remove the cover. A(323) - Lexmark C750 | Service Manual - Page 232
removal See "Cover, left lower" on page 7-5 for the part number. 1. Remove the front left handle cover assembly. See "Front the door. A(323) Redrive door removal See "Redrive door" on page 7-16 for the part number. 1. Open the redrive door. 2. Loosen the redrive door upper hinge screw type "324 - Lexmark C750 | Service Manual - Page 233
5060-00x Paper path access door cover removal See "Paper path access door" on page 7-3 for part number. 1. Remove the paper tray. 2. Remove the front left handle cover assembly. See "Front left handle cover assembly removal" on page 4-10. 3. Open the paper - Lexmark C750 | Service Manual - Page 234
5060-00x Front lower left cover removal See "Front lower left cover" on page 7-3 for part number. 1. Remove the paper tray. 2. Remove the front left handle cover assembly. See "Front left handle door. 5. Remove the front lower left cover with the paper path door attached. 4-16 Service Manual - Lexmark C750 | Service Manual - Page 235
00x Autocompensator pick assembly removal 1. 2. 3. 4. 5. Remove all cartridges. Remove the ITU. See "ITU assembly removal" on page 4-37. Remove tray 1. Remove the second transfer roll. See "Second transfer roll removal" on page 4-79. Remove the transfer plate. Lifting and rotating the right edge of - Lexmark C750 | Service Manual - Page 236
5060-00x 7. Remove the five screws "323" (C) and remove the lower left cover and the jam access door. Warning: Be careful not to lose the access door spring. C(323) 8. Remove the pin (D) that holds in the MPF swing arm assembly. D 4-18 Service Manual - Lexmark C750 | Service Manual - Page 237
5060-00x 9. Remove the MPF swing arm assembly (E). E Repair information 4-19 - Lexmark C750 | Service Manual - Page 238
paper level assembly to drop into the cavity that the tray is inserted into. Disconnect the cable from the paper level sensor. Pull the paper lever sensor cable up through the opening. Remove the paper level sensor assembly. Left Side View Front View F F Paper Level Sensor 4-20 Service Manual - Lexmark C750 | Service Manual - Page 239
5060-00x 11. Disconnect the pick motor and the transparency sensor connectors (G). G 12. Remove four screws (H) holding the pick assembly in place. DO NOT REMOVE THIS SCREW H Repair information 4-21 - Lexmark C750 | Service Manual - Page 240
come off of the lower frame. Also identify which pegs the spring clip is sitting on. These pegs are typically marked with white paint. J 4-22 Service Manual - Lexmark C750 | Service Manual - Page 241
part number. 1. 2. 3. 4. Open the front cover. Remove the yellow toner cartridge. Remove the front right light shield part numbers. Warning: Do not remove the printhead unless instructed to do so. 1. 2. 3. 4. 5. Open the front cover. Remove the toner cartridges. Remove the ITU assembly. See "ITU - Lexmark C750 | Service Manual - Page 242
the cartridge rail screws, scribe the location of the printhead on the frame before removing the printhead. This will help put the printhead back in the previous location. If a printhead alignment problem develops, go to "Printhead removal and adjustment" on page 4-50. B C 4-24 Service Manual - Lexmark C750 | Service Manual - Page 243
the two upper screws (D) that mount each cartridge drive motor and the cartridge contact assembly to the upper frame for the cartridge contact assembly you want to remove. D (Yellow) D (Cyan) D (Magenta) D (Black) 9. Press the three cartridge contact assembly retaining tabs (E) and remove the - Lexmark C750 | Service Manual - Page 244
engine board. See "Engine board removal" on page 4-29. 3. Remove the three cartridge drive assembly mounting screws (A) for the cartridge drive assembly you want to remove. 4. Disconnect the cable (B) from the cartridge drive assembly. 5. Remove the cartridge drive assembly. 4-26 Service Manual - Lexmark C750 | Service Manual - Page 245
rail assembly 1. 2. 3. 4. 5. Open the front cover. Remove the toner cartridges. Remove the ITU assembly. See "ITU assembly removal" on page 4-37. Set aside the top cover assembly. It is not necessary to totally remove it. See "Top cover assembly removal" on - Lexmark C750 | Service Manual - Page 246
the part number. 1. Remove the RIP board shield assembly. See "RIP board shield assembly removal" on page 4-71. 2. Remove the four screws type "323" (A) and four screws type "121" (B) that mount the developer HVPS board. A323) B(121) 3. Disconnect the HVPS to RIP board cable (C), the cartridge - Lexmark C750 | Service Manual - Page 247
board removal See "Engine board" on page 7-39 for the part number. 1. 2. 3. 4. 5. 6. Remove the rear fan cover. See "Rear fan cover removal" on page 4-8. Remove the rear cover. See "Rear cover removal" on page 4-8. Disconnect all cables from the engine board. Remove the screw "323" (A) holding the - Lexmark C750 | Service Manual - Page 248
shield removal See "Engine board shield" on page 7-39 for the part number. 1. Remove the RIP board shield assembly. See "RIP the shield. Friction buckler removal See "Friction buckler" on page 7-21 for the part number. 1. Press the multipurpose feeder (MPF) latch to disconnect the MPF. 2. Use - Lexmark C750 | Service Manual - Page 249
: Be sure the fuser assembly has cooled before you remove it. See "Fuser assembly 115V 500W" on page 7-9 or "Fuser assembly 220V 500W" on page 7-9 for the part numbers. 1. Open the lower right door assembly. 2. Unlatch the two fuser latches (A). 3. Remove the fuser assembly. A Repair information - Lexmark C750 | Service Manual - Page 250
duct removal See "Fuser bottom duct" on page 7-5 for the part number. 1. 2. 3. 4. Remove "Fuser assembly removal" on page 4-31. Remove "Fuser top duct removal" on page 4-34. Remove the redrive belt cover duct (A). Remove fuser left duct (B). 5. Remove fuser bottom duct. 4-32 Service Manual - Lexmark C750 | Service Manual - Page 251
5060-00x Fuser drive assembly removal See "Fuser drive assembly w/motor" on page 7-12 for the part number. 1. Remove "Fuser bottom duct removal" on page 4-32. 2. Swing lever (A) and disengage VTB shaft. 3. Remove the fuser drive assembly screws (A) type "323" on page 4-3 and remove the assembly. - Lexmark C750 | Service Manual - Page 252
screws (A), part number 12G6529 and remove the fan. Fuser top duct removal See "Fuser top duct" on page 7-5 for the part number. 1. Remove the rear fan cover. See "Rear fan cover removal" on page 4-8. 2. Remove the fuser top duct screw type "323" (A) and remove the top duct. 4-34 Service Manual - Lexmark C750 | Service Manual - Page 253
" on page 7-11 or "Fuser assembly, web oiler 220V 500W" on page 7-11 for the part number. 1. Remove the fuser top duct. See "Fuser top duct removal" on page page 4-9. 4. Disconnect the web oiler motor assembly cable (A). 5. Remove the fuser web oiler motor assembly mounting screws and remove the - Lexmark C750 | Service Manual - Page 254
5060-00x Installation notes Note: When you reinstall the web oiler motor assembly, pull the excess cable, twist, install a cable tie, and route the cable down into the printer. Note: Make sure the motor cable (A) is routed away from gears (B). 4-36 Service Manual - Lexmark C750 | Service Manual - Page 255
5060-00x ITU assembly removal See "ITU assembly" on page 7-25 for the part number. 1. 2. 3. 4. Open the front cover. Remove the toner cartridges. Open the MPF. Raise the ITU release lever (A) and slide the ITU from the printer. ITU drive assembly removal See "ITU motor drive assembly with SKC - Lexmark C750 | Service Manual - Page 256
board shield removal" on page 4-30. 3. Remove the ITU drive motor mounting screws (B), disconnect cable (A), and remove the assembly. Low voltage power supply (LVPS) removal See "LVPS, 115V" on page 7-35 or "LVPS, 220V" on page 7-35 for the part number. 1. Remove the rear fan cover. See "Rear - Lexmark C750 | Service Manual - Page 257
5060-00x 4. Remove the right rear cover screw type "121" (A). 5. Open the redrive cover and remove the screw type "121" (A) from the top of the LVPS and remove the LVPS from the printer. Note: Be sure to reinstall the ground strap when you replace the LVPS. Repair information 4-39 - Lexmark C750 | Service Manual - Page 258
feeder (MPF) removal See "Multipurpose Feeder (MPF)" on page 7-21 for the part number. 1. Open the MPF to the lowest position. 2. Remove the MPF cable cover screw (A). 3. Place flatblade screwdriver in the slot (B) on the MPF cable cover and gently pry open the cover. 4-40 Service Manual - Lexmark C750 | Service Manual - Page 259
5060-00x 4. Disconnect the MPF switch cable from the MPF sensor (C). 5. Pull the MPF cable free of the enclosure and out from under the cable retainer (D). 6. Remove the MPF strap screw (E) type "412" on page 4-4. Repair information 4-41 - Lexmark C750 | Service Manual - Page 260
19 for the part number. 1. Remove lower left side covers to gain access to the nip relief handle. 2. Remove waste toner container. 3. Reinsert paper tray into printer. If any fragments fall into the printer they should land cut the lower piece of the handle free from the post. 4-42 Service Manual - Lexmark C750 | Service Manual - Page 261
5060-00x Some scarring of the post is expected, but be careful not to damage the post. c. Remove any remnants of the handle. Check the paper tray to check for debris. For example, see the fragment (B) in the following picture. Repair information 4-43 - Lexmark C750 | Service Manual - Page 262
to gently pry up on the top portion of the lever allowing the handle to press into place onto the post using moderate force. 4-44 Service Manual - Lexmark C750 | Service Manual - Page 263
and rotate the handle into its home position. This seats the nip relief lever into the correct position. 5. Check for proper operation. 6. Install the waste toner container. 7. Replace the covers. Repair information 4-45 - Lexmark C750 | Service Manual - Page 264
5060-00x Operator panel removal See "Operator panel assembly, low volt" on page 7-3 or "Operator panel assembly, high volt" on page 7-3 for the part number. 1. Remove the operator panel bezel. 2. Unlatch the operator panel latches (A). 4-46 Service Manual - Lexmark C750 | Service Manual - Page 265
5060-00x 3. Disconnect the operator panel cable from the operator panel and remove the operator panel. Outer EMC shield removal Loosen screw type "232" (A) and lift the outer EMC shield from the printer. Repair information 4-47 - Lexmark C750 | Service Manual - Page 266
on page 7-57 for the part number. Note: The paper Engine board shield removal" on page 4-30. Open the waste toner container door and slide the container out. Remove the paper size per package)" on page 7-24 for the part number. Front roll 1. Wipe any toner or debris from the bottom pan to avoid - Lexmark C750 | Service Manual - Page 267
. The autocompensator pick rolls are located in the base machine. There are also rollers in all tray options. If you have additional trays beneath your printer, check the condition of these rollers when you replace the rollers in your - Lexmark C750 | Service Manual - Page 268
adjustment See "Printhead assembly" on page 15 for the part numbers. Warnings: • Do not loosen or replace more must to perform the "Printhead mechanical alignment" on page 4-51 and "Electronic color alignment" on page 4-58. • The front cover must be installed and printhead. 4-50 Service Manual - Lexmark C750 | Service Manual - Page 269
5060-00x Printhead mechanical alignment 1. Identify the configuration of your printer. The following steps are similar for both versions, except you need to remove two extra screws when you have the PSD bracket. You may have a - Lexmark C750 | Service Manual - Page 270
tool, placing the locating pin (C) in the middle hole (A). c. Secure the alignment tool bracket (D) with screw provided or a screw removed from the previous step. 4-52 Service Manual - Lexmark C750 | Service Manual - Page 271
alignment tool in the front of the printhead and secure alignment tool bracket (D) with screw provided. Align the locating pin (C) in the hole in printer frame. 4. Turn the thumbwheel (E) until the end of the thumbwheel just touches the printhead mounting arm for both the front and rear alignment - Lexmark C750 | Service Manual - Page 272
Make sure the right rear screw goes through the printhead spacer located at the right rear of the printer frame. 6. Bias the new printhead assembly against the front and rear stops. 7. Tighten the right rear is biased against both the thumbwheels when tightening the screws. 4-54 Service Manual - Lexmark C750 | Service Manual - Page 273
d. Release the buttons when Performing Self Test displays. 10. Select Alignment Menu, select the color of the printhead that was replaced, and set the Z value to zero. Exit the Diagnostics Menu 11. With the printer at Ready prompt, hook up a computer through the USB, network, or parallel connection - Lexmark C750 | Service Manual - Page 274
printer on. d. Release the buttons when Performing Self Test displays. 2. Select Registration from the menu. Four margin offset settings are displayed. T= sxx L= sxx B=sxx R=sxx Where xx is the current value and s is the sign (+ or -) 3. Press Go to print the Quick Test Page. 4-56 Service Manual - Lexmark C750 | Service Manual - Page 275
Right margin Bottom margin Value change effect: Increasing the value moves the color plane down the page Increasing the value moves the color plane to the left Increasing the value moves the color plane to the left Increasing the value moves the color plane down the page Range -25 to +25 -25 to +25 - Lexmark C750 | Service Manual - Page 276
sheets shows cyan printed over a black target. Align the cyan over the black. Repeat for each of the colors cyan, magenta, and yellow. 3. Examples of the alignment pages are available in Appendix B. See "Printhead alignment test 128 to +127 -300 to +300 -300 to +300 -16 to +16 4-58 Service Manual - Lexmark C750 | Service Manual - Page 277
the Cyan Alignment Page. Use the top row to determine adjustments. See "Printhead alignment test page-cyan (three of three)" on appendix page B-11 for a color sample of the entire page. a. Use the leftmost target in the first row to adjust the cyan and black horizontal lines in the target (T value - Lexmark C750 | Service Manual - Page 278
Cyan Alignment Page. Use the leftmost target in the first row to adjust the cyan and black vertical lines until the targets overlap. 5. Adjust the setting and press Go to print the page and page-yellow (two of three)" on appendix page B-10 for color samples of these pages. 4-60 Service Manual - Lexmark C750 | Service Manual - Page 279
• If the center is located outside the area between -2 and +2, you need to calculate the appropriate alignment adjustment for that color. Continue to the next step. 5. Calculate the Alignment Group values. Alignment Group A B or C D E F Adjustment Calculation(s) dT=(A+B+B-C+D)/3 dT=(A+B+B-C+D)/3 dT - Lexmark C750 | Service Manual - Page 280
any changes to color alignment. 11. Exit diagnostics. Printhead thermistor card removal See "Thermistor card" on page 7-15 for the part number. Note: 4-5. 2. Disconnect the cable (A) from the thermistor. 3. Remove the two screws (B). 4. Remove the printhead thermistor card. 4-62 Service Manual - Lexmark C750 | Service Manual - Page 281
card. Leave the old PSD sensor assembly in place. • Disconnect the cable from the PSD card and connect it to the printhead thermistor card. Note sensor assembly, check the Registration and Color Alignment. • See "REGISTRATION" on page 3-14. • See "Electronic color alignment" on page 4-58 • See - Lexmark C750 | Service Manual - Page 282
7-29, for the part number. 1. 2. 3. 4. Power off the printer. Remove the four toner cartridges and leave the front door open. Remove the ITU assembly. See "ITU assembly removal" on page 4-37. Check each of the rear bellcranks for cracks or breakage. 5. Remove the spring (A). 4-64 Service Manual - Lexmark C750 | Service Manual - Page 283
down (B) and remove. Be careful not to lose the contact spring (C). Installation note Replace the bellcranks by reversing the order of removal. Note: Test the color coverage by running the Print Quality Pages in the Diagnostics or Configuration Menu. Repair information 4-65 - Lexmark C750 | Service Manual - Page 284
5060-00x Rear bellcrank removal (black) See the assembly, "ITU loading" on page 7-29, for the part number. 1. 2. 3. 4. 5. 6. Power off the printer. Remove the four toner cartridges and leave the front door open. Remove "ITU assembly removal" on page 4-37. Check each of the rear bellcranks for - Lexmark C750 | Service Manual - Page 285
bellcrank down (C) and remove. Be careful not to lose the spring (D). Installation note Replace the bellcranks by using reverse order of removal. Note: Test the color coverage by running the Print Quality Pages in the Diagnostics or Configuration Menu. Repair information 4-67 - Lexmark C750 | Service Manual - Page 286
Open the redrive door. 2. Remove the redrive assembly screw type "323" (A). 3. Remove the drive belt (B) from the lower redrive pulley. 4. Remove the redrive assembly. Note: When you reinstall the redrive assembly be sure to align the notch in the redrive assembly with tab (A). 4-68 Service Manual - Lexmark C750 | Service Manual - Page 287
motor" on page 7-19 for the part number. 1. Remove the rear cover. See "Rear cover removal" on page 4-8. 2. Remove the transfer HVPS. See "Transfer HVPS board removal" on page 4-80. 3. Remove the registration motor mounting screws (B), cut the cable tie (A), and remove the assembly. Repair - Lexmark C750 | Service Manual - Page 288
all cables from printer restarts at this point. At the READY prompt, print a Menu page and look for the correct printer name and equivalent/updated RIP code level. The Menu page prints with acceptable print quality indicating calibration data has been properly preserved. 4-70 Service Manual - Lexmark C750 | Service Manual - Page 289
part number. 1. 2. 3. 4. Remove the top cover assembly. See "Top cover assembly removal" on page 4-5. Remove the rip fan screw type "324" (A). Disconnect the rip fan cable board. See "RIP board removal" on page 4-70. transfer HVPS board. See "Transfer HVPS board removal" on page 4-80. RIP board - Lexmark C750 | Service Manual - Page 290
a sensor cable assembly. See "S2/transparency/narrow media sensor assembly" on page 7-17 for the part number. Removing the old assembly Note: Disconnect all power from the printer before proceeding with the steps below. 1. 2. 3. 4. 5. Open the front cover and remove the print cartridges. Open - Lexmark C750 | Service Manual - Page 291
-00x 10. Disconnect the MPF assembly door hinge restraint by removing screw (E) and remove the MPF assembly. 11. Gently pull the sensor assembly cable (B) through the opening between the upper and lower frame and remove the sensor assembly through the rectangular opening. 12. Clip and remove the - Lexmark C750 | Service Manual - Page 292
Disconnect the three sensors (A) from the frame. A Service tip: A light aimed toward the grounding clip (B) makes the removal easier. C B 14. Service tip: Leave the old sensor cable assembly (C) in place temporarily after disconnecting the sensors as a guide to placement of the sensors for the - Lexmark C750 | Service Manual - Page 293
frame and out through the opening (E). Note: Guiding the cable through the small opening requires some patience. Use the diagram below and the steps following as a guide. B A C D E G F A -Sensors, part of sensor cable assembly B -Grounding clip C -Cable tie D -Rectangular opening E -Opening - Lexmark C750 | Service Manual - Page 294
up gently, the connector tends to follow the pathway through and out. a. Insert the J68 connector of the sensor cable assembly into the rectangular opening and push up. b. With your other hand, twist the sensor cable assembly toward the left and continue guiding the cable up. 4-76 Service Manual - Lexmark C750 | Service Manual - Page 295
the same openings. Connect J68 to the engine board. Connect the MPF tray assembly sensor cable to the engine board at J70. Install the new cable tie (B) on the cable bundle and trim the excess cable tie flush. Replace other cable ties you removed in earlier steps. B Repair information 4-77 - Lexmark C750 | Service Manual - Page 296
(A) closest to the fuser end of the printer. A 10. Install the new sensor assembly (B) in the lower frame. B 11. Verify the sensors flags are not sticking and are moving freely. Service tip: Use a sheet of paper between the upper and lower guides to activate the sensors. 4-78 Service Manual - Lexmark C750 | Service Manual - Page 297
the ITU and print cartridges. Reconnect power to the printer. Run the print test to check for correct operation before replacing the right rear cover. Replace the right rear cover. Second transfer roll removal See "Second transfer roll" on page 7-14 for the part number. 1. Remove the ITU assembly - Lexmark C750 | Service Manual - Page 298
the part number. 1. 2. 3. 4. 5. Remove the rear cover. See "Rear cover removal" on page 4-8. Remove the transfer HVPS board screw type "324" and "312" (A). Disconnect the five spade terminals (B) from the transformers. Disconnect the control cable (C). Remove the transfer HVPS board. 4-80 Service - Lexmark C750 | Service Manual - Page 299
plate assembly" on page 7-14 for part number. 1. Remove the "S2/NMS/transparency sensor assembly removal" on page 4-72. 2. Remove the transfer plate. Lifting and rotating the right edge of the plate up to a 45° angle releases the transfer plate. Remove the grounding strap (A) attached to the - Lexmark C750 | Service Manual - Page 300
"Transfer plate assembly" on page 4-81. 2. Remove the fuser bottom duct. See "Fuser bottom duct removal" on page 4-32. 3. Remove the two front screws (A). 4. Loosen belt (B) on redrive assembly and remove from redrive gear. 5. Remove belt from gear on vacuum belt transfer unit. 4-82 Service Manual - Lexmark C750 | Service Manual - Page 301
5060-00x 6. Rotate release lever on gear until the gear can be removed. 7. Remove screw from ground wire. 8. Remove vacuum belt transfer belt unit far enough to release ground wire from restraint clips and remove completly. Repair information 4-83 - Lexmark C750 | Service Manual - Page 302
5060-00x Vacuum transport belt (VTB) fan removal See "VTB fan" on page 7-41 for the part number. 1. Remove the RIP board shield assembly Waste container door" on page 7-5 for the part number. 1. Open the waste container door. 2. Flex the door and remove it from the hinges (A). 4-84 Service Manual - Lexmark C750 | Service Manual - Page 303
installation See "Fuser web oiler upgrade kit and replacements" on page 1-4 for the part number. 1. 2. 3. 4. Enter CE Diagnostic mode. Select Printer Setup. Select Configuration ID. Increase the last two digits each by four. Configuration ID =123456* The left digit blinks, indicating it is the - Lexmark C750 | Service Manual - Page 304
5060-00x 7. Unlatch the two fuser latches (A). A 8. 9. 10. 11. Remove the fuser assembly. Open the front cover. Remove the yellow print cartridge. Remove the front right light shield screws (B) and (C) and remove the light shield. B(323) C(324) 4-86 Service Manual - Lexmark C750 | Service Manual - Page 305
5060-00x 12. Carefully remove the paper path access door cover right mounting screw (D). 13. Tape front jam access door (E) if tape is available, to help hold the door in place. Repair information 4-87 - Lexmark C750 | Service Manual - Page 306
5060-00x 14. Remove the front right handle cover assembly screws (F) and remove the assembly. F(323) 15. Open paper tray (G). 4-88 Service Manual - Lexmark C750 | Service Manual - Page 307
5060-00x 16. Remove screw (H) from the top front support bracket. Swing bracket to the right. H 17. Use the alignment pins (I) on the web oiler fuser motor assembly to position the assembly in holes (J) and install the assembly. J I Repair information 4-89 - Lexmark C750 | Service Manual - Page 308
5060-00x 18. Secure the web oiler motor assembly with screws (K). K 19. Install the web oiler card using screws (L). L 4-90 Service Manual - Lexmark C750 | Service Manual - Page 309
into web oiler card connector (M). Plug web oiler drive assembly cable into cable connector (N). Note: Make sure the cables from the drive assembly are routed along the lower frame and are not in contact with the drive assembly gears. M N 21. Reinstall paper path access - Lexmark C750 | Service Manual - Page 310
5060-00x 22. Align tabs on the front right light shield with the slots (O) on the frame. O 23. Move the front right light shield up until alignment stud (P) and the screw hole (Q) are aligned. Q P 4-92 Service Manual - Lexmark C750 | Service Manual - Page 311
5060-00x 24. Attach the new fuser web oiler fuser housing (R) to the new web oiler fuser. R 25. Insert the web oiler fuser assembly into the fuser assembly and install the fuser assembly into the printer. Repair information 4-93 - Lexmark C750 | Service Manual - Page 312
5060-00x 4-94 Service Manual - Lexmark C750 | Service Manual - Page 313
5060-00x 5. Connector locations Locations Printer boards Connector locations 5-1 - Lexmark C750 | Service Manual - Page 314
Web oiler drive motor (optional) Printheads BOR drive motor RIP fan Yellow carriage drive motor Fuser drive motor Pick assy. motor Fuser fan VTB fan Registration drive motor Magenta carriage drive motor ITU drive motor Black carriage drive motor Cyan carriage drive motor 5-2 Service Manual - Lexmark C750 | Service Manual - Page 315
5060-00x Printer sensors Connector locations 5-3 - Lexmark C750 | Service Manual - Page 316
5060-00x Cartridge contact assembly pin locations 5-4 Service Manual - Lexmark C750 | Service Manual - Page 317
5060-00x Engine board cabling Connector locations 5-5 - Lexmark C750 | Service Manual - Page 318
5060-00x RIP board cabling 5-6 Service Manual - Lexmark C750 | Service Manual - Page 319
5060-00x Connectors Engine board See "Engine board" on page 5-7 Connector J2 Main Fan Pin no. 1 2 3 4 J3 Oiler Stepper Motor 1 2 3 4 Signal FAN1 Stall IN Ground FAN1 PWM Out +24 V dc Left Side Oiler PHA OUT Oiler PHA OUT + Oiler PHB OUT + Oiler PHB OUT - Connector locations 5-7 - Lexmark C750 | Service Manual - Page 320
V dc (options) Ground -TXD1_OUT +24 V dc (options) Ground RXD1_OPTS_IN Ground +5 V dc (options) Ground -TXD1_OUT Y ON OUT FUSER ON OUT +5 V dc +5 V dc Y DIR OUT FUSER DIR OUT +24 V dc +24 V dc Ground Ground Y CLK OUT FUSER CLK OUT Y HALL IN FUSER HALL IN Y LOCK IN FUSER LOCK IN 5-8 Service Manual - Lexmark C750 | Service Manual - Page 321
12 J11 Bin Full 1 2 3 J12 BOR (Lift) Motor 1 2 Signal +3.3 V dc +5 V dc +5 V dc +24 V dc +24 V dc Ground Ground Ground Ground Ground EXIT SENSOR IN FUSER CAM1 IN FUSER CAM2 IN OILER ENC A IN OILER ENC B IN HR THERM IN BR THERM IN Ground +5 V dc switched ZERO Xing IN HR HEAT ON OUT - Lexmark C750 | Service Manual - Page 322
RIP) Ground (-VSYNC Y OUT) FPIRQ RIP (-VSYNC M OUT) (-VSYNC C OUT) Ground (-VSYNC K OUT) (-HSYNC Y IN) (-HSYNC C IN) (-HSYNC M IN) (-HSYNC K IN) (-RIP PRESENT OUT) Ground ITU ZONECLK OUT ITU HOMEZONE OUT 5-10 Service Manual - Lexmark C750 | Service Manual - Page 323
Motor Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 J52 Waste CLNR Full 1 2 J53 RIP Fan 1 2 3 4 J64 ITU Drive Motor Black Cartridge Drive Motor 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Signal M ON OUT C ON OUT +5 V dc +5 V dc M DIR OUT C DIR OUT +24 V dc M and C +24 V dc M - Lexmark C750 | Service Manual - Page 324
OUT IN PAPER LOW IN Ground LED VCC Ground +3.3 V dc XPAR TRAY 1 IN +5 V dc switched MPF FEED LOW IN MPF FEED OUT IN Ground 5-12 Service Manual - Lexmark C750 | Service Manual - Page 325
PWM OUT M SERVO INTO M TX PWM OUT Ground +24 V dc switched +5 V dc ITU DATA +3.3 V dc TPS GAIN OUT ITU TEMP BELT HOLE 1 Ground Ground ITU EEPROM CLK +24 V dc Right Side TPS LED ON OUT TONER PATCH OUT BELT HOLE 2 +5 V dc switched +5 V dc SWITCHED AUTOCOMP ENC IN Ground Ground AUTOCOMP OUT 2 AUTOCOMP - Lexmark C750 | Service Manual - Page 326
Ground OP I2RGround HSYNC-/SOS Ground +5 V dc Hsync Ground mm ref freq mm lock mm strt/en Ground +24 V dc mir mtr N/C N/C laser en Ground laser adj Ground laser PWM +5 V dc head Ground video data video data + Ground lexhsync/eos ALTHERM +5 V dc EOS card Ground lexhsync/eos ALTHERM +5 V dc EOS card - Lexmark C750 | Service Manual - Page 327
4 5 6 7 8 9 10 Signal Ground HSYNC-/SOS Ground +5 V dc Hsync Ground mm ref freq mm lock mm strt/en Ground +24 V dc mir mtr N/C N/C laser en Ground laser PWR ADJ Ground laser PWM +5 V dc head Ground video data video data + Ground HSYNC-/SOS Ground +5 V dc Hsync DC Ground mm ref freq mm lock mm strt - Lexmark C750 | Service Manual - Page 328
(Video) Pin no. 1 2 3 4 5 6 7 8 9 10 11 Signal N/C N/C laser en Ground laser adj Ground laser PWM +5 V dc head Ground video data video data +x Ground lexhsync/eos thermistor +5 V dc EOS (EOS) 1 2 3 4 5 6 7 8 J10 Printhead Black Connector (Mirror Motor) 1 2 3 4 5 6 7 8 9 10 5-16 Service Manual - Lexmark C750 | Service Manual - Page 329
5060-00x Connector J11 Printhead Black Connector (Video) Pin no. 1 2 3 4 5 6 7 8 9 10 11 Signal N/C N/C laser en Ground laser adj Ground laser PWM +5 V dc head Ground video data video data + +5 V dc Ground V Cor J12 Cover Open Switch Connector 1 2 3 J13 Parallel Port Connector J18 USB Port - Lexmark C750 | Service Manual - Page 330
+5 V dc +24 V dc (Fuser) ITU Zone CLk ITU Zone HB RIPPRES N Ground HSYNCN M HSYNCN K HSYNCN Y HSYNCN C Ground VSYNCN K VSYNCN M VSYNCN C VSYNCN Y OP IRQ R OWL PIO NOTIFY R Ground OP I2DATA R OP I2CLK R J24 Engine to RIP Connector 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 5-18 Service Manual - Lexmark C750 | Service Manual - Page 331
5060-00x Transfer high voltage power supply (HVPS) Connector CN1 HVPS Input Connector Pin no 1 2 3 4 5 6 7 8 9 10 11 Signal +24 V dc +24 V dc Return M-Txpwm M-Srvo out Y-Txpwm Y-Srvo out C-Txpwm C-Srvo out K-Txpwm K-Srvo out KCYM-Txenable Connector locations 5-19 - Lexmark C750 | Service Manual - Page 332
Terminal to Magenta Transfer Cable T102 Transformer HV Terminal I (ITU) T201 Transformer HV Terminal K Black T301 Transformer HV Terminal C Cyan T401 Transformer HV Terminal Y Yellow T501 Transformer HV Terminal M Magenta 1 1 1 1 1 Developer high voltage power supply (HVPS) board Connector - Lexmark C750 | Service Manual - Page 333
) C-CtSense C-TnrSense (Gnd Return) Y-CtSense Y-TnrSense (Gnd Return) Cleaner Bias Terminal CN2 Cartridge Signature Button Black CN3 Cartridge Signature Button Magenta CN4 Cartridge Signature Button Cyan CN5 Cartridge Signature Button Yellow CB Terminal 1 2 1 2 1 2 1 2 Connector locations 5-21 - Lexmark C750 | Service Manual - Page 334
5060-00x Low voltage power supply (LVPS) Engine and RIP board cable connectors Connector RIP Board Power Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Engine Board Power 1 2 3 4 5 6 7 8 dc +24 V dc +3.3 V dc +5 V dc +5 V dc +24 V dc +24 V dc Ground Ground Ground Ground Ground 5-22 Service Manual - Lexmark C750 | Service Manual - Page 335
5060-00x Connector Engine board cable (LVPS to J10 fuser connector) Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 Signal EXITSENSORIN BURCam1 N/C WebEncoderA WebEncoderB HRThermistor BURThermistor Ground +5 V dc switched ZEROXINGIN Heat On #1 (HR) Heat On #2x (BUR) Connector locations 5-23 - Lexmark C750 | Service Manual - Page 336
5060-00x Low voltage power supply (LVPS) LVPS to fuser connectors (on LVPS) Fuser to LVPS connectors (on fuser) 5-24 Service Manual - Lexmark C750 | Service Manual - Page 337
connectors Connector LVPS AC Fuser Connector Pin no. 1 2 3 4 5 LVPS DC Fuser Control Connector 1 2 3 4 5 6 7 8 9 10 Signal AC Load #1 AC Common Ground N/C AC Load #2x FusExitSen BURCam1 N/C WebEncoderA WebEncoderB HRThermistor BURThermistor Return - Analog Ground +5 V dc switched N/C Connector - Lexmark C750 | Service Manual - Page 338
V dc +24 V dc +24 V dc +24 V dc REG A REG A REG B REG B No Connection +24 V dc +24 V dc PICK A *PICK A PICK B *PICK B +24 V dc LHOT 5-26 Service Manual - Lexmark C750 | Service Manual - Page 339
5060-00x Connector CN6 Sensors Side Door/Level/ Empty/ Registration Home/Pick Home Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Signal +5 V dc GND SIDE +5 V dc GND LEVEL +5 V dc GND EMPTY +5 V dc GND RHOME +5 V dc GND PHOME +5 V dc GND SIZE 0 +5 V dc GND SIZE 1 +5 V dc GND SIZE 2 +5 V dc GND NE - Lexmark C750 | Service Manual - Page 340
Switched 1 2 Signal AC In Not used Not used Not used AC In AC Out to LVPS Not used AC Out to LVPS +5 V dc Ground 5-28 Service Manual - Lexmark C750 | Service Manual - Page 341
6 CN5 Chad Box Full 1 2 3 Signal SOL+ SOLMTRMTRN/C MTR+ MTR+ N/C No Cartridge Low Staple Home Position Unit Check Ground +5 V dc Jog A Jog *A Jog B Jog *B Bun A Bun *A Bun B Bun *B +5 V dc Jog Home Pos Sensor Ground +5 V dc Bundle Belt Home Pos Sensor Ground +5 V dc Chad Box Sensor Ground Connector - Lexmark C750 | Service Manual - Page 342
Surface Upper Sensor Ground +5 V dc Paper Surface Lower Sensor Ground A+ AB+ B+SOL -SOL +5 V dc Inverter Jam Sensor Ground Switch + Switch MTR + MTR A+ AB+ BN/C 5-30 Service Manual - Lexmark C750 | Service Manual - Page 343
5060-00x See "HCOF system board" on page 5-32 Connector CN14 Power Pin no 1 2 3 4 CN15 Feed Motor 1 2 3 4 5 CN16 Punch 1 2 3 4 5 6 7 8 9 10 11 12 CN17 Feed 1 2 CN18 Communications 1 2 3 4 5 CN19 Joint 1 2 3 CN20 CPU Prog 1 20 Signal +24 V dc +24 V dc P- - Lexmark C750 | Service Manual - Page 344
5060-00x HCOF system board 5-32 Service Manual - Lexmark C750 | Service Manual - Page 345
area of the On/Off switch and the power supply • Damaged, missing, or altered covers, especially in the area of the top cover and the power supply cover • Possible safety exposure from any non-Lexmark attachments Lubrication specifications Lubricate only when parts are replaced or as needed, not on - Lexmark C750 | Service Manual - Page 346
in the FRU. Only use the lubricant included. Fuser drive assembly Before installing the new Fuser Drive Assembly: 1. Apply a thin coating of Nyogel type 774 grease to the points identified (A) from the supplied packet. A B 2. Rotate the motor housing (B) to distribute evenly. 6-2 Service Manual - Lexmark C750 | Service Manual - Page 347
5060-00x Cartridge drive assembly 1. Apply a thin coating of Nyogel type 744 grease to the points identified (A) from the supplied packet. A B 2. Rotate the motor housing (B) to distribute evenly. ITU drive assembly 1. Apply a thin coating of Nyogel type 744 grease to the points identified (A) - Lexmark C750 | Service Manual - Page 348
print quality and reliability of the printer. There are two assemblies, ITU assembly and Second Transfer Roll, in a maintenance kit. Both should be replaced at the same time. The parts are available as a maintenance kit with P/N 12G6304, ITU Maintenance Kit. 84 Oiler Nearly Exhausted is displayed - Lexmark C750 | Service Manual - Page 349
Shown) in the Asm-Index column indicates that the part is procurable but is not pictured in the illustration. PP: (Parts Packet) in the Description column indicates the part is contained in a parts packet. The Lexmark C750 (5060-00x) laser printer is available in two models: 5060-001 5060-002 The - Lexmark C750 | Service Manual - Page 350
5060-00x Assembly 1: Covers 7-2 Service Manual - Lexmark C750 | Service Manual - Page 351
assembly Left front light shield cover Paper tray guide Operator panel bezel with logos Operator panel assembly, low volt Operator panel assembly, high volt Screw, PP 12G6532 Front upper pivot cover Front access door support Cable, HVPS interlock/cover open (2-wire) Cable, printhead interlock/cover - Lexmark C750 | Service Manual - Page 352
5060-00x Assembly 1.1: Covers 7-4 Service Manual - Lexmark C750 | Service Manual - Page 353
12G6383 12G6384 12G6340 12G6386 12G6360 12G6358 56P2290 56P2291 12G6510 Part number 12G6408 Units 1 14 1 1 1 1 1 1 1 Fuser latch slide Fuser latch slide spring Fuser top duct Duplex actuator arm Fuser wall duct Fuser bottom duct Fuser left duct Redrive belt cover duct Cable tie (6 in pack) Parts - Lexmark C750 | Service Manual - Page 354
5060-00x Assembly 2: Cartridge mounting 7-6 Service Manual - Lexmark C750 | Service Manual - Page 355
5060-00x Assembly 2: Cartridge mounting Asm- Index 2-1 2 3 12G6535 12G6536 Part number Units 16 4 4 Description Screw, PP 12G6532 Guide assembly, left side Guide assembly, right side Parts catalog 7-7 - Lexmark C750 | Service Manual - Page 356
5060-00x Assembly 3: Fuser 7-8 Service Manual 1 2 3 - Lexmark C750 | Service Manual - Page 357
5060-00x Assembly 3: Fuser Asm- Index 3-1 1 1 2 2 2 3 3 3 Part Number 12G6495 12G6301 12G6302 12G6516 12G6337 12G6341 12G6517 12G6338 12G6342 1 1 Units 1 1 1 1 1 1 Description Fuser assembly 100V 500W Fuser assembly 115V 500W Fuser assembly 220V 500W Fuser lamp, 100V 500W hot roll Fuser lamp, 115V - Lexmark C750 | Service Manual - Page 358
5060-00x Assembly 3.1: Fuser (web oiler) 1 2 3 7-10 Service Manual - Lexmark C750 | Service Manual - Page 359
Assembly 3.1: Fuser Asm- Index 3.1-1 2 2 2 3 Part Number 12G6545 12G6495 12G6514 12G6515 12G6543 Units 1 1 1 1 1 Description Web oiler assembly Fuser assembly, web oiler 100V 500W Fuser assembly, web oiler 115V 500W Fuser assembly, web oiler 220V 500W Web oiler index drive assembly Parts catalog - Lexmark C750 | Service Manual - Page 360
5060-00x Assembly 4: Fuser drive 2 1 3 Asm- Index 4-1 2 3 Part Number 56P1213 56P1238 Units 1 4 1 4 Description Fuser drive assembly w/motor Screws PP 12G6309 Fuser drive motor Screws, motor mounting 7-12 Service Manual - Lexmark C750 | Service Manual - Page 361
5060-00x Assembly 5: Vacuum transport belt assembly Asm- Index 5-1 2 Part Number 12G6491 12G6489 Units 1 1 Description Jam access spring Vacuum transport belt assembly Parts catalog 7-13 - Lexmark C750 | Service Manual - Page 362
5060-00x Assembly 6: Transfer Asm- Index 6-1 2 Part Number 12G6303 12G6488 Units 1 1 Description Second transfer roll Transfer plate assembly 7-14 Service Manual - Lexmark C750 | Service Manual - Page 363
5060-00x Assembly 7: Printheads Asm- Index 7-1 2 3 4 5 6 7 8 Part Number 12G6322 Units 4 12 12 4 Description Printhead assembly (Do not replace more than one printhead at a PP 12G6533 Printhead spacer Card assembly, printhead diagnostic aid 56P1198 56P2292 56P2296 4 8 4 1 Parts catalog 7-15 - Lexmark C750 | Service Manual - Page 364
12G6492 12G6355 12G6513 12G6512 12G6356 Units 8 2 2 1 1 1 1 1 2 1 Description Anchor, bracket mounting Upper door hinge Screw, PP 12G6533 Redrive belt 300 T Redrive assembly Redrive door Lower rear door latch Lower front door latch Screw, PP 12G6530 Door assembly, lower right 7-16 Service Manual - Lexmark C750 | Service Manual - Page 365
5060-00x Assembly 9: Paper feed input Asm- Index 9-1 Part number 12G6486 Units 1 Description S2/transparency/narrow media sensor assembly Parts catalog 7-17 - Lexmark C750 | Service Manual - Page 366
2 3 4 5 6 Part Number 12G6470 12G6469 12G6467 12G6468 12G6466 Units 1 1 4 1 1 4 Description Waste container latch spring Waste container latch Paper size sensing spring Paper size sensing bracket Screw, paper size sensing assembly mounting PP 12G6531 Paper size sensing link 7-18 Service Manual - Lexmark C750 | Service Manual - Page 367
5060-00x Assembly 11: Paper feed transport Asm- Index 11-1 2 3 4 5 6 7 Part Number 56P2199 12G6483 12G6482 12G6481 12G6484 12G6480 Units 1 1 1 1 1 1 3 Description Nip relief handle Gear, staging idler Gear, staging reduction #1 Registration plate assembly Gear, reference plate drive - Lexmark C750 | Service Manual - Page 368
5060-00x Assembly 12: Multipurpose feeder (MPF) 7-20 Service Manual - Lexmark C750 | Service Manual - Page 369
12G6455 Part number 12G6452 12G6460 Units 1 cable MPF cable cover MPF support bracket spring MPF support bracket MPF bracket assembly MPF drive gear MPF drive gear bushing MPF drive gear shaft MPF autocompensator pick assembly Rib housing Friction buckler Buckler housing MPF door assembly Parts - Lexmark C750 | Service Manual - Page 370
5060-00x Assembly 13: 500-sheet integrated tray 7-22 Service Manual - Lexmark C750 | Service Manual - Page 371
13: 500-sheet integrated tray Asm- Index 13-1 2 3 4 5 6 7 8 9 10 11 12G6426 12G6568 12G6421 12G6420 12G6417 56P1504 Part number 12G6416 12G6419 12G6418 12G6425 Units 1 1 1 1 1 1 1 4 1 1 2 Description 500-Sheet tray assembly Back restraint latch Back restraint Tray bias bellcrank assembly Screw, PP - Lexmark C750 | Service Manual - Page 372
00x Assembly 14: Autocompensator assembly Asm- Index 14-1 2 3 4 5 6 7 8 9 10 NS Part Number 56P0551 12G6471 12G6558 12G6427 12G6557 12G6476 12G6472 12G6461 99A0070 56P0552 56P1237 Units 1 1 1 1 1 1 1 1 2 1 1 Description Cable, paper media low/out Tray interlock bellcrank Pick arm lift bellcrank - Lexmark C750 | Service Manual - Page 373
5060-00x Assembly 15: ITU assembly Asm- Index 15-1 2 3 4 Part Number 12G6413 12G6503 12G6504 56P1295 Units 1 1 1 1 Description ITU light shield assembly Cable, printhead interlock/cover open (3-wire) Cable, HVPS interlock/cover open (2-wire) ITU assembly Parts catalog 7-25 - Lexmark C750 | Service Manual - Page 374
5060-00x Assembly 16: ITU drive assembly 5 5 3 4 2 1 7-26 Service Manual - Lexmark C750 | Service Manual - Page 375
5060-00x Assembly 16: ITU drive assembly Asmindex 16-1 2 3 4 5 Part number 56P1216 12G6385 56P0568 Units 1 1 1 4 4 Description ITU motor drive assembly with SKC motor #58 Gear ITU drive motor, SKC Screw, PP 12G6309 (ITU drive motor to ITU drive assembly) Screw, PP 12G6309 (ITU drive assembly lower - Lexmark C750 | Service Manual - Page 376
5060-00x Assembly 17: ITU loading 7-28 Service Manual - Lexmark C750 | Service Manual - Page 377
12G6442 Units 1 4 4 8 1 Description Yellow terminal contact assembly Terminal, contact spring Screw PP 12G6533 Cartridge support roller Parts packet, ITU loading - yellow, including - Yellow BOR spring - Rear block guide - Rear transfer bellcrank - Front V block guide - Front transfer bellcrank - Lexmark C750 | Service Manual - Page 378
5060-00x Assembly 18: BOR drive assembly Asm- Index 18-1 Part number 12G6446 Units 1 Description BOR housing assembly with motor 7-30 Service Manual - Lexmark C750 | Service Manual - Page 379
5060-00x Assembly 19: Cartridge contact assembly Asm- Index 19-1 2 3 Part number 56P0310 12G6377 12G6376 Units 4 1 1 Description Cartridge contact assembly, complete Rear hold down bellcrank Rear hold down spring Parts catalog 7-31 - Lexmark C750 | Service Manual - Page 380
5060-00x Assembly 20: Cartridge drive assembly 7-32 Service Manual - Lexmark C750 | Service Manual - Page 381
5060-00x Assembly 20: Cartridge drive assembly Asm- Index 20-1 2 3 56P1214 56P1215 Part Number Units 4 3 1 Description Screw, PP 12G6530 Cartridge drive assembly, cyan/magenta/black Cartridge drive assembly, yellow Parts catalog 7-33 - Lexmark C750 | Service Manual - Page 382
5060-00x Assembly 21: Electronics 7-34 Service Manual - Lexmark C750 | Service Manual - Page 383
5060-00x Assembly 21: Electronics Asm- Index 21-1 Part number 11A9095 Units 1 Description Power cord set U.S., Canada (LV), Brazil (LV), Colombia (LV), Costa Rica (LV), Dominican Republic (LV), Ecuador (LV), El Salvador (LV), Guatemala (LV), Honduras (LV), Nicaragua (LV), - Lexmark C750 | Service Manual - Page 384
5060-00x Assembly 21.1: Electronics 7-36 Service Manual - Lexmark C750 | Service Manual - Page 385
99A0408 99A2432 12G6333 12G6332 12G6487 Part number Units 22 1 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 Description Screw, PP 12G6309 RIP board ground shield Cable mount RIP board assembly - network, model 5060-002 INA riser support bracket Riser card assembly w/o support brackets Standoff, INA RIP spacer - Lexmark C750 | Service Manual - Page 386
Electronics Asm- Index 21.2-1 2 3 4 5 6 7 Part number 12G6327 Units 1 1 1 1 Description Transfer HVPS board Screw, PP 12G6309 Screw, PP 12G6533 Screw, PP 12G6530 Standoff, high voltage power supply - developer Screw, PP 12G6540 Developer HVPS board 12G6541 12G6328 4 4 1 7-38 Service Manual - Lexmark C750 | Service Manual - Page 387
5060-00x Assembly 21.3: Electronics Asm- Index 21.3-1 2 3 4 5 Part Number 12G6336 12G6323 12G6387 Units 1 12 1 1 14 Description Engine board shield Screw, PP 12G6531 Engine board Ground strap Screw, PP 12G6309 Parts catalog 7-39 - Lexmark C750 | Service Manual - Page 388
5060-00x Assembly 21.4: Electronics 7-40 Service Manual - Lexmark C750 | Service Manual - Page 389
5060-00x Assembly 21.4: Electronics Asm- Index 21.4-1 2 3 4 5 6 7 12G6361 12G6479 12G6490 12G6382 12G6529 Part Number 12G6343 Units 1 2 1 1 1 1 2 Description RIP fan duct Screws, PP 12G6530 RIP fan VTB fan VTB fan gap cover Fuser fan Screws, fuser fan mounting Parts catalog 7-41 - Lexmark C750 | Service Manual - Page 390
5060-00x Assembly 22: Electronic cabling-engine board 7-42 Service Manual - Lexmark C750 | Service Manual - Page 391
56P0551 12G6387 12G6320 Part Number Units 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Description Cable, waste toner full, attached to ITU drive assembly (P/N 56P1216) Cable, HVPS control - transfer Cable, MPF paper level Cable, autocompensator motor Cable assembly (includes S2 - Lexmark C750 | Service Manual - Page 392
5060-00x Assembly 23: Electronic cabling-RIP board 7-44 Service Manual - Lexmark C750 | Service Manual - Page 393
7 8 9 10 11 12 13 14 15 16 17 12G6313 12G6312 12G6315 12G6311 12G6310 12G6314 Part Number 12G6503 56P0310 56P0310 56P0310 56P0310 12G6387 12G6321 Units 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Description Cable, printhead interlock/cover open Cable, signature button, attached to yellow HV contact assembly - Lexmark C750 | Service Manual - Page 394
56P0174 56P1502 Units 1 1 1 1 1 1 Description Cable assembly, black terminal contact Cable assembly, cyan terminal contact Cable assembly, yellow terminal contact Cable assembly, magenta terminal contact Cable assembly, second transfer voltage Cable, HVPS control - transfer 7-46 Service Manual - Lexmark C750 | Service Manual - Page 395
25: Electronic cabling-developer HVPS Asm- Index 25-1 2 3 4 Part Number 56P1502 56P0310 56P1561 56P0311 Units 1 3 1 1 Description Cable assembly, HVPS control - developer Cartridge contact assembly, complete, cyan/magenta/yellow Cartridge contact assembly, complete, black Cable, ITU Autocomp out - Lexmark C750 | Service Manual - Page 396
5060-00x Assembly 26: Output expander 7-48 Service Manual - Lexmark C750 | Service Manual - Page 397
56P0408 56P0402 56P0401 99A0409 99A1580 99A0414 56P0409 99A1817 99A1688 99A1689 99A0482 99A0481 Part number 99A0107 99A0104 99A0369 99A0052 56P0407 99A0915 Units 1 1 1 1 1 1 9 1 1 1 1 1 assembly, mechanical linkage Cover, rear support Rear cover Level sensor bracket Flag, output paper level Sensor, dual - Lexmark C750 | Service Manual - Page 398
5060-00x Assembly 26.1: Output expander 7-50 Service Manual - Lexmark C750 | Service Manual - Page 399
Screw, PP 56P0169 Cover, front Belt, 160 gear Arm assembly, belt idler Spring, belt tensioner Spring, output tray Latch, output tray Frame assembly Sensor, Output Expander pass thru Shaft bearing PP 99A0572 Shaft assembly, middle 40T, also order PP 99A0572 Kit, Multi-Bin Stacker Parts catalog 7-51 - Lexmark C750 | Service Manual - Page 400
5060-00x Assembly 27: 5-bin mailbox 7-52 Service Manual - Lexmark C750 | Service Manual - Page 401
Part number 12G6409 99A1710 56P0416 56P0423 99A1708 99A1725 99A1742 99A1712 56P0420 99A1743 Units 1 1 1 1 1 1 Kit, 5-Bin Mailbox asm Bail, order 99A1743, 5-Bin Mailbox asm kit Support, paper tray Stop asm, paper tray Flag, bin full Rear structural cover Cable, dual sensor Sensor, dual bin level Cable - Lexmark C750 | Service Manual - Page 402
5060-00x Assembly 27.1: 5-bin mailbox 7-54 Service Manual - Lexmark C750 | Service Manual - Page 403
99A1729 99A1730 99A1789 56P0418 99A1732 99A1738 99A1722 99A1787 99A1721 56P0421 99A0462 99A1715 99A1717 99A1788 99A0450 56P0550 Part number 99A1741 99A1727 Units 4 1 12 4 4 4 4 4 1 4 5 4 4 1 1 rear access door Gear, drive Retainer, R-ring Retainer Cable, tray media level sensor Parts catalog 7-55 - Lexmark C750 | Service Manual - Page 404
5060-00x Assembly 28: 500-sheet drawer option 7-56 Service Manual - Lexmark C750 | Service Manual - Page 405
12G6562 12G6559 12G6558 12G6566 12G6557 12G6560 12G6380 12G6554 12G6563 12G6552 12G6561 12G6555 12G6567 99A0070 12G6510 Part number 56P0168 Units 1 31 1 1 1 1 1 1 1 1 1 1 1 7 guide Wall support plate Base door assembly Spring 500 option deflector Grounding spring Pick roll tires Cable tie Parts - Lexmark C750 | Service Manual - Page 406
5060-00x Assembly 28.1: 500-sheet tray option 7-58 Service Manual - Lexmark C750 | Service Manual - Page 407
28.1: 500-sheet tray option Asm- Index 28.1-1 2 3 4 5 6 7 8 9 10 11 12G6426 12G6568 12G6421 12G6420 12G6417 56P1504 Part number 12G6416 12G6419 12G6418 12G6425 Units 1 1 1 1 1 1 1 1 1 1 2 Description 500-Sheet tray assembly Back restraint latch Back restraint Tray bias bellcrank assembly Screw, PP - Lexmark C750 | Service Manual - Page 408
5060-00x Assembly 29: Duplex option 7-60 Service Manual - Lexmark C750 | Service Manual - Page 409
1 1 1 1 Part number 56P0480 99A2540 56P0447 Units 1 5 1 20 1 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 2 Description Back cover Redrive bearing Duplex entry shaft assembly Screw PP 12G6533 Right side front tray guide Deflector actuator assembly Duplex front jam tray assembly Duplex support bracket Sensor - Lexmark C750 | Service Manual - Page 410
5060-00x Assembly 29.1: Duplex option 7-62 Service Manual - Lexmark C750 | Service Manual - Page 411
Part number 56P0456 56P0462 56P0463 56P0464 Units 1 1 1 1 1 6 1 1 1 1 1 1 2 2 2 1 3 2 3 1 1 Description Duplex support plate Autoconnect cable assembly DC forward/reverse motor assembly DC duplex feed motor Screw PP 12G6309 Cable Tie (6 in pack) Back support Duplex card assembly Belt, transfer - Lexmark C750 | Service Manual - Page 412
5060-00x Assembly 30: High-capacity input tray (HCIT) 7-64 Service Manual - Lexmark C750 | Service Manual - Page 413
3 1 2 1 2 1 1 1 2 2 Part number 56P0561 56P0519 56P0520 56P0518 56P0522 56P0516 56P0511 56P0494 Units 1 1 1 1 3 10 1 1 Description Paper cable System control board Screws PP 12G6533 LVPS Elevator motor assembly AC power outlet AC power inlet Jumper, AC power cord Paper tray guide Elevator lift belt - Lexmark C750 | Service Manual - Page 414
5060-00x Assembly 30.1: High-capacity input tray (HCIT) 7-66 Service Manual - Lexmark C750 | Service Manual - Page 415
options front right Locating pin, options rear left Options autoconnect cable assembly Options cable mounting plate Cable, feed unit special sensors Cable, feed unit sensors Cable, elevator motor Magnetic latch Tray present lever Cable clamp Kit, stabilizer with mounting screws Parts catalog 7-67 - Lexmark C750 | Service Manual - Page 416
5060-00x Assembly 31: High-capacity output finisher (HCOF) 7-68 Service Manual - Lexmark C750 | Service Manual - Page 417
cover Upper right side cover (tall finisher) Upper right side cover (short finisher) Lower tray cover Bottom kick cover Front/rear lower cover Bar tip unit Lower right side cover Cover front door Finisher install kit Cover wire Cartridge staple Parts catalog 7-69 - Lexmark C750 | Service Manual - Page 418
5060-00x Assembly 31.1: High-capacity output finisher 7-70 Service Manual - Lexmark C750 | Service Manual - Page 419
surface sensor (EE-SX460-P1-CHN) Printer docking switch SS-5FL-3T(10E) Tray limit switches (includes two) Exit timing sensor (EE-SPY415) Inverter transfer belt (40S3M198) Cable, communications Power cord Bracket finisher alignment Pack magnet, strong and weak and door latch Parts catalog 7-71 - Lexmark C750 | Service Manual - Page 420
5060-00x Assembly 31.2: High-capacity output finisher 7-72 Service Manual - Lexmark C750 | Service Manual - Page 421
assembly Accumulator slides Staple cartridge Chad box full sensor (EE-SPY415) Inverter timing sensor (OJ511K-A5) Paper feed-input belt (40S3M279) Cover open switch Jogger fence belt (B40S2M460) Harness cable assembly D5 - low voltage power supply to low voltage power relay board Parts catalog 7-73 - Lexmark C750 | Service Manual - Page 422
5060-0xx Assembly 32: High-capacity output finisher cables Service Manual - Lexmark C750 | Service Manual - Page 423
board to front door switch Harness cable assembly D2 - system board to low voltage power supply Harness cable assembly D3 - low voltage power supply relay board to AC input/output Harness cable assembly D5 - low voltage power supply to low voltage power supply relay board. Parts catalog 7-75 - Lexmark C750 | Service Manual - Page 424
Part 56P1434 99A0545 99A0560 99A0629 99A0424 56P0161 99A0923 Units 1 1 1 1 1 1 1 code Lexmark Optra Forms™ software Lexmark Forms Director software Lexmark Forms 4MB flash DIMM Lexmark Forms 8MB flash DIMM Lexmark Forms 16MBMB flash DIMM Hard disk, Lexmark Forms Hard drive mounting kit Service Manual - Lexmark C750 | Service Manual - Page 425
7370595 Part number Units 1 Kit, relocation package assembly printer Kit, relocation package assembly Output Expander Kit, relocation package assembly 5-Bin Mailbox Kit, relocation package assembly 500 Drawer Kit, relocation package assembly Duplex Kit, relocation package assembly Finisher Parts - Lexmark C750 | Service Manual - Page 426
5060-00x 7-78 Service Manual - Lexmark C750 | Service Manual - Page 427
00x Appendix A-Service tips Printhead diagnostics If you get a printhead error, follow this diagnostic to find the specific failure. 1. Verify that all the printhead cables are properly seated. 2. If the printhead cables are properly seated and the error remains, record the error code. Continue to - Lexmark C750 | Service Manual - Page 428
the printhead cables from the RIP board in the printer and connect them to the printhead diagnostic tool. c. Connect the printhead diagnostic tool cables to the connectors on the RIP board in the printer. This reverses the printhead color signals for the selected pair of colors. A-2 Service Manual - Lexmark C750 | Service Manual - Page 429
. Press Go to clear the error. • If the error code remains the same, replace the RIP board. If that solves the problem, you are finished. • If the printer displays a different printhead error code, which indicates another color, the printhead or the printhead cables are defective. See the table - Lexmark C750 | Service Manual - Page 430
replaced, you must to perform the "Printhead mechanical alignment" on appendix page A-5 and "Electronic color alignment" on appendix page A-12. • The front cover must be installed and closed before any new printhead, it must be removed before installing the replacement printhead. A-4 Service Manual - Lexmark C750 | Service Manual - Page 431
configuration of your printer. The following steps are similar for both versions, except you need to remove two extra screws when you have the PSD bracket. You may have a PSD bracket (A), whether or not the PSD or thermistor is connected. You may not have a bracket. Appendix A-Service tips A-5 - Lexmark C750 | Service Manual - Page 432
alignment tool, placing the locating pin (C) in the middle hole (A). c. Secure the alignment tool bracket (D) with screw provided or a screw removed from the previous step. A-6 Service Manual - Lexmark C750 | Service Manual - Page 433
in the front of the printhead and secure alignment tool bracket (D) with screw provided. Note: Align the locating pin (C) in the hole in printer frame. 4. Turn the thumbwheel (E) until the end of the thumbwheel just touches the printhead mounting arm for both the front and rear alignment assemblies - Lexmark C750 | Service Manual - Page 434
Make sure the right rear screw goes through the printhead spacer located at the right rear of the printer frame. 6. Bias the new printhead assembly against the front and rear stops. 7. Tighten the right printhead is biased against both the thumbwheels when tightening the screws. A-8 Service Manual - Lexmark C750 | Service Manual - Page 435
color of the printhead that was replaced, and set the Z value to zero. Exit the Diagnostics Menu 11. With the printer , PHALIGN6.FLS, from the enclosed CD to the printer. Note: Lay the printed Printhead Mechanical Alignment Test the color lines. 12. Loosen the printhead screws before making - Lexmark C750 | Service Manual - Page 436
printer on. d. Release the buttons when Performing Self Test displays. 2. Select Registration from the menu. Four margin offset settings are displayed. T= sxx L= sxx B=sxx R=sxx Where xx is the current value and s is the sign (+ or -) 3. Press Go to print the Quick Test Page. A-10 Service Manual - Lexmark C750 | Service Manual - Page 437
value moves the color plane down the page Increasing the value moves the color plane to the left Increasing the value moves the color plane to the left Increasing the value moves the color plane down the page , press Return to exit the registration function. Appendix A-Service tips A-11 - Lexmark C750 | Service Manual - Page 438
the sheets shows Cyan printed over a Black target. Align the Cyan over the Black. Repeat for each of the colors Cyan, Magenta, and Yellow. 3. To align Cyan, press Menu until Cyan is displayed, press Select. Four alignment -128 to +127 -300 to +300 -300 to +300 -16 to +16 A-12 Service Manual - Lexmark C750 | Service Manual - Page 439
R or Right value press Go to print the Cyan Alignment Page. Use the rightmost target in the first row to adjust the Cyan and Black vertical lines. Adjust the setting and press Go to print the page and verify the setting, until the lines are even. Press Select to save the - Lexmark C750 | Service Manual - Page 440
the Cyan Alignment Page. Use the leftmost target in the first row to adjust the Cyan and Black vertical lines until the targets overlap. 5. Adjust the setting and press Go to print the page and verify the Select Prt Line Len Cal. There are six alignment groups, A through F. A-14 Service Manual - Lexmark C750 | Service Manual - Page 441
color band and determine the value. • If all the color adjustment for that color. Continue to calculations for the colors that are 10. See "Electronic color alignment" on page -12. Select the appropriate color. Change value of the that the adjusted values and the color bands for Cyan, Magenta, and - Lexmark C750 | Service Manual - Page 442
procedure for missing or faded planes 1. 2. 3. 4. 5. 6. 7. Turn the printer off. Remove all cartridges and the ITU. Inspect the bellcranks. Enter the Configuration Menu. See "Entering CONFIG MENU" on page 3-7. Select Prt Quality Pgs and press Select. Open the vacuum transport belt (VTB) jam - Lexmark C750 | Service Manual - Page 443
"Cartridge contact assembly pin locations" on page 5-4 • Developer HVPS cable - Make sure that there is no damage to the cable running from the system board. • Developer HVPS board. • System board. If the image is well developed on the PC drum, but the same plane is missing or faded on the ITU belt - Lexmark C750 | Service Manual - Page 444
side covers to gain access to the nip relief handle. 2. Remove waste toner container. 3. Reinsert paper tray into printer. If any fragments fall into the printer they should land in the paper tray and be easy to remove. 4. is expected, but be careful not to damage the post. A-18 Service Manual - Lexmark C750 | Service Manual - Page 445
5060-00x c. Remove any remnants of the handle. Check the paper tray to check for debris. For example, see the fragment (B) in the following picture. Appendix A-Service tips A-19 - Lexmark C750 | Service Manual - Page 446
the rear of the machine and insert lower portion of handle so that it is trapped between the lever and the reference edge plate (C). A-20 Service Manual - Lexmark C750 | Service Manual - Page 447
and rotate the handle into its home position. This seats the nip relief lever into the correct position. 5. Check for proper operation. 6. Install the waste toner container. 7. Replace the covers. Appendix A-Service tips A-21 - Lexmark C750 | Service Manual - Page 448
instructions for aligning the finisher to the printer. The sides of the finisher must be parallel with the printer and at the same height, or you may have paper feeding problems - Printer - Optional duplex unit - Three additional 500-sheet drawers - Printer stand - Finisher A-22 Service Manual - Lexmark C750 | Service Manual - Page 449
5060-00x • Tall finisher - Printer - Optional duplex unit - One additional 500-sheet drawer - Optional 2000-sheet drawer - Finisher Appendix A-Service tips A-23 - Lexmark C750 | Service Manual - Page 450
you have a short or tall finisher. Short finisher 1. Attach caster brakes (A) to the two back legs of the printer caster base. 2. Screw the caster brakes onto the legs of the caster base. 3. Adjust the leveling feet (B) the 2000-sheet drawer so all four securely touch the floor. A-24 Service Manual - Lexmark C750 | Service Manual - Page 451
pin Adjust the two casters on the left side (closest to the printer) to raise or lower the finisher as needed, so the pin (D) on the printer properly aligns with the hole in the finisher (the pin should raises the finisher). 3. Repeat with the other caster bolt. Appendix A-Service tips A-25 - Lexmark C750 | Service Manual - Page 452
casters on the right side (under the platform cover) to raise or lower the finisher as needed so the two bumper pads on the finisher lightly touch the printer. This ensures that the gap (H) between the printer and finisher is the same from top to bottom. A-26 Service Manual - Lexmark C750 | Service Manual - Page 453
If necessary, adjust the tilt of the finisher so that the front is flush with the front of the printer. This can usually be done by adjusting the two front casters (those closest to the finisher door). Note: steps 1, 2, and 3, make sure each caster touches the floor. Appendix A-Service tips A-27 - Lexmark C750 | Service Manual - Page 454
pin" on appendix page A-25 3. The finisher is vertically aligned to the printer. "Step 3: Align the bumper pads" on appendix The finisher's two bumper pads should lightly touch the printer. page A-26 4. The finisher's tilt is correct. The printer and finisher's front covers should be flush together - Lexmark C750 | Service Manual - Page 455
, the duplex option fails to actuate the deflector in the fuser and the paper is diverted away from the duplex. The duplex rubber deflector button with the compression spring deflector button. 1. The FRU kit contains a spring and button that should be assembled as shown. 2. A-Service tips A-29 - Lexmark C750 | Service Manual - Page 456
5060-00x A-30 Service Manual - Lexmark C750 | Service Manual - Page 457
pages available in various menus. While they are as close as possible to what you will see, variations in printing may result from individual user printer settings, media, and printer alignment. Print Menus-Page one of two Appendix B-Print quality samples B-1 - Lexmark C750 | Service Manual - Page 458
5060-00x Print Menus-Page two of two B-2 Service Manual - Lexmark C750 | Service Manual - Page 459
5060-00x Print tests Print Quality Pages-Title page (total of five) Appendix B-Print quality samples B-3 - Lexmark C750 | Service Manual - Page 460
5060-00x Print Quality Pages-Page 1 (total of five) B-4 Service Manual - Lexmark C750 | Service Manual - Page 461
5060-00x Print Quality Pages-Page 2 (total of five) Appendix B-Print quality samples B-5 - Lexmark C750 | Service Manual - Page 462
5060-00x Print Quality Pages-Page 3 (total of five) B-6 Service Manual - Lexmark C750 | Service Manual - Page 463
5060-00x Print Quality Pages-Page 4 (total of five) Appendix B-Print quality samples B-7 - Lexmark C750 | Service Manual - Page 464
5060-00x Registration Quick Test B-8 Service Manual - Lexmark C750 | Service Manual - Page 465
5060-00x Alignment test pages Printhead alignment test pages-magenta (one of three) Appendix B-Print quality samples B-9 - Lexmark C750 | Service Manual - Page 466
5060-00x Printhead alignment test page-yellow (two of three) B-10 Service Manual - Lexmark C750 | Service Manual - Page 467
5060-00x Printhead alignment test page-cyan (three of three) Appendix B-Print quality samples B-11 - Lexmark C750 | Service Manual - Page 468
5060-00x Print Line Len page B-12 Service Manual - Lexmark C750 | Service Manual - Page 469
2-149 500-sheet tray option parts catalog 7-58 service check 2-108 5-bin mailbox parts catalog 7-52, 7-54 relocation packaging 7-77 service check 2-104 symptoms 2-5 9xx service errors 2-6-2-9 error code table 2-6-2-9 service checks 2-88-2-104 B Base Sensor Test 3-29 Belt Tracking 3-17 black only - Lexmark C750 | Service Manual - Page 470
11 engine board cabling 7-42, 7-44 connectors 5-7 diagram 5-7 locations 5-1 removal 4-29 error codes 1565 service error 2-41 1xx service errors 2-9 2xx paper jams 2-25 , 2-28 3x-8x attendance errors 2-34 9xx service errors 2-6 error log clearing 3-33 viewing 3-33 ESD-sensitive parts 4-1 Exit Config - Lexmark C750 | Service Manual - Page 471
5-19 developer board 4-28 locations 5-1 transfer HVPS board 4-80 M maintenance kits 6-4 media specifications 1-7 memory tests cache 3-20 DRAM 3-20 ROM 3-21 messages error codes 2-6 user attendance messages 2-28 models 1-1 Motor Detect 3-16 multipurpose feeder (MPF) parts catalog 7-20 removal 4-40 - Lexmark C750 | Service Manual - Page 472
2-137 light lines or streaks 2-138 light print 2-142 light print - all colors 2-142 low image density 2-143 missing colors 2-141 negative ghost image 2-144 one color has light print 2-143 poor color alignment 2-144 residual image 2-145 service check 2-136 smudged or distorted images 2-146 toner is - Lexmark C750 | Service Manual - Page 473
80 transfer plate assembly 4-81 transparency sensor assembly 4-72 vacuum transport belt (VTB) 4-82 VTB fan 4-84 waste container door 4-84 waste container latch 4-85 web oiler fuser kit installation 4-85 replacement motors, lubrication 6-2 Reset Calibration 3-31 Reset Fuser Cnt 3-8 RIP board cabling - Lexmark C750 | Service Manual - Page 474
7-38 removal 4-80 transfer plate assembly parts 7-14 removal 4-81 transparency, defect locator 3-3 TYPE SENSING 3-9 U user attendance messages 2-28 V vacuum transport belt (VTB) parts catalog 7-13 removal 4-82 vacuum transport belt (VTB) fan parts catalog 7-41 removal 4-84 I-6 Service Manual - Lexmark C750 | Service Manual - Page 475
card assembly w/o support brackets 7-37 12G6327 Transfer HVPS board 7-38 12G6328 Developer HVPS board 7-38 12G6329 Cable, LVPS to engine board and fuser, attached to LVPS 7-43 12G6329 Cable, LVPS to engine/power, attached to LVPS 7-43 12G6329 Cable, LVPS to RIP board power, attached to LVPS - Lexmark C750 | Service Manual - Page 476
7-21 12G6347 Front hold down bellcrank 7-3 12G6349 Cable, fuser and yellow cartridge motor 7-43 12G6350 Cable, cyan and magenta cartridge drive motors 7-43 12G6350 Cable, cyan and magenta cartridge motor 7-43 12G6353 Cartridge support roller 7-29 12G6354 Rib housing 7-21 12G6355 Redrive - Lexmark C750 | Service Manual - Page 477
5060-00x 12G6413 ITU light shield assembly 7-25 12G6416 500-Sheet Cable assembly (includes S2/NMS/transparency sensors 7-43 12G6486 S2/transparency/narrow media sensor assembly 7-17 12G6487 Ground strap 7-37 12G6488 Transfer plate assembly 7-14 12G6489 Vacuum transport belt assembly 7-13 Part - Lexmark C750 | Service Manual - Page 478
side 7-7 12G6538 Parts packet, 500-sheet tray 7-77 12G6539 Parts packet, screw 7-15 12G6539 Parts packet, screw type 124 7-77 12G6540 Parts packet, screw 7-35, 7-38 12G6540 Parts packet, screw type 121 7-77 12G6541 Standoff, high voltage power supply - developer 7-38 I-10 Service Manual - Lexmark C750 | Service Manual - Page 479
7-35 43H5544 Power cord set, PRC 7-35 56P0161 RS-232-C serial/parallel 1284-C adapter 7-76 56P0162 Adapter, parallel 1284 C-B 7-76 56P0167 Anchor, bracket mounting 7-16 56P0168 Drive assembly, 500 option 2 7-57 56P0169 Parts packet, screw 7-49, 7-51 56P0174 Cable assembly, 2nd transfer voltage - Lexmark C750 | Service Manual - Page 480
(170P2M4 7-71 56P0335 Exit roller drive belt (40S2M264 7-71 56P0336 Output tray offset drive belt (40S2M176 7-71 56P0337 Punch belt (40S2M176 7-71 56P0338 Low voltage power supply 7-71 56P0340 Cable, communications 7-71, 7-75 56P0341 Power cord 7-71, 7-75 56P0342 Caster 7-71 56P0343 Punch - Lexmark C750 | Service Manual - Page 481
56P0449 Support decurl guide 56P0451 Backup spring assembly 56P0452 Backup spring assembly 56P0454 Wall support 56P0455 Sensor mount plate 56P0456 Duplex support plate 56P0457 Duplex support bracket 56P0458 Chassis ground spring 56P0459 Back support 56P0462 Autoconnect cable assembly - Lexmark C750 | Service Manual - Page 482
Level sensor flag 7-65 56P0539 Near empty sensor flag 7-65 56P0540 Spring, extension 7-65 56P0541 Tray present lever 7-67 56P0542 Separation/torque roller 7-65 56P0543 Cable clamp 7-67 56P0544 Emitter timing wheel 7-65 56P0547 Elevator lift belt 7-65 I-14 Service Manual - Lexmark C750 | Service Manual - Page 483
/black 7-33 56P1215 Cartridge drive assembly, yellow 7-33 56P1216 Cable, waste toner full, attached to ITU drive assembly 7-43 56P1216 ITU motor drive assembly with SKC motor 7-27 56P1237 Autocomp shaft assembly 7-24 56P1238 Fuser drive motor 7-12 56P1277 Paper tray guide 7-3 56P1280 Harness - Lexmark C750 | Service Manual - Page 484
, board mounting 7-53 99A0267 Parts packet, retainer 7-61 99A0323 Paper guide assembly 7-63 99A0351 Sensor, Output Expander pass thru 7-51 99A0361 Belt, 160 gear 7-51 99A0362 Arm assembly, belt idler 7-51 99A0363 Pulley, drive 7-51 99A0364 Spring, belt tensioner 7-51 I-16 Service Manual - Lexmark C750 | Service Manual - Page 485
LocalTalk/serial/infrared 99A0572 Parts packet, shaft bearing 7- Tray, paper cap 99A1713 Support, paper tray 99A1715 Roller drive 99A1718 Cable asm, lower autoconnect 99A1719 Cable asm, 5-Bin Mailbox pass thru 99A1743 Kit, 5-Bin Mailbox asm 99A1744 Kit, Multi-Bin Stacker 99A1784 Bracket, - Lexmark C750 | Service Manual - Page 486
5060-00x 99A1786 Gear, drive 7-53 99A1787 Deflector 7-55 99A1788 Retainer, R-ring 7-55 99A1789 C-clip 7-55 99A1789 Retainer, C-clip 7-63 99A1817 Tray, Output Expander 7-49 99A2432 Blank parallel shield, use with network RIP boards 7-37 99A2540 Redrive bearing 7-61 I-18 Service Manual - Lexmark C750 | Service Manual - Page 487
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Lexmark™
C750
5060-00x
• Table of contents
• Start diagnostics
• Safety and notices
• Trademarks
• Index
Lexmark and Lexmark with diamond design are
trademarks of Lexmark International, Inc., registered
in the United States and/or other countries.
Revised:
July
27,
2005