HP 750c Service Manual
HP 750c - DesignJet Plus Color Inkjet Printer Manual
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- HP 750c | Service Manual - Page 1
Service Manual HP DesignJet 700, HP DesignJet 750C, HP DesignJet 750C Plus and HP DesignJet 755CM Plotters/Printers - HP 750c | Service Manual - Page 2
The procedures described in this manual are to be performed by HP-qualified service personnel only. Electrical Shock Hazard Serious shock hazard leading to death or injury may result if you do not take the following precautions: Hewlett-Packard shall not be liable for errors contained herein or for - HP 750c | Service Manual - Page 3
Service Manual HP DesignJet 700 HP DesignJet 750C HP DesignJet 750C Plus and HP DesignJet 755CM Plotters/Printers - HP 750c | Service Manual - Page 4
plotters. Part Numbers Part numbers for plotter options, accessories and service parts are located in chapter 10. Conventions This manual contains information for the monochrome HP DesignJet 700 plotters, the color HP DesignJet 750C and 750C Plus plotters and the color HP DesignJet 755CM printers - HP 750c | Service Manual - Page 5
Information Description 1Ć2 Applications 1Ć2 Drivers 1Ć2 Graphics Languages 1Ć2 DeviceĆControl Languages 1Ć2 Interface 1Ć3 Network Connections 1Ć3 Memory 1Ć3 Accuracy 1Ć3 Resolution 1Ć4 Media Types 1Ć4 Media Sizes 1Ć5 Media Margins 1Ć5 Other Plotter Features 1Ć6 Upgrading 1Ć6 2 Site - HP 750c | Service Manual - Page 6
Media Bin (Optional 3Ć6 Installing the Plotter/Printer 3Ć10 Using the Plotter 3Ć10 DesignJet 750C/750C Plus/755CM Front Panel 3Ć10 DesignJet 700 Front Panel 3Ć11 ThirdĆParty Inks and OffĆAxis Ink Systems 3Ć11 Configuring the Plotter/Printer 3Ć12 Verifying Plotter Operation 3Ć12 PowerĆOn Self - HP 750c | Service Manual - Page 7
5Ć6 Bail Stepper Motor 5Ć6 Wiper Stepper Motor 5Ć6 Fan 5Ć6 Window Sensor 5Ć6 PinchĆWheel Sensor 5Ć6 Media Sensor 5Ć7 Drop Sensor 5Ć7 PrimerĆCam Sensor 5Ć7 Printed Circuit Assembly (PCA) Overview 5Ć7 Main PCA 5Ć7 Carriage PCA 5Ć8 LineĆSensor PCA 5Ć9 TemperatureĆSensor IC 5Ć9 Linear - HP 750c | Service Manual - Page 8
the YĆAxis Motor Holder 6Ć32 Removing the Cutter 6Ć33 Removing the Cartridge Carriage and Drive Belt 6Ć34 Removing the Trailing Cable 6Ć36 Reinstalling the Trailing Cable 6Ć39 Removing the Starguard Assembly 6Ć40 Removing the Primer 6Ć41 Removing the Service Station 6Ć42 Removing the - HP 750c | Service Manual - Page 9
8Ć5 System Error Codes 8Ć9 Important Information on Troubleshooting Error Codes 8Ć9 Service Tests 8Ć17 Entering the Service Tests Menu System 8Ć20 1. EEROM 8Ć21 2. EEROM Clear Counters 8Ć22 3. EEROM Model Type 8Ć23 3. EEROM Model Type 8Ć23 4. MIO 8Ć24 5. Main PCA 8Ć25 6. MainĆCarriage Com - HP 750c | Service Manual - Page 10
8Ć50 30. Window Sensor 8Ć51 31. Pinchwheel Sensor 8Ć52 32. Button Test 8Ć53 PCĆBased Diagnostics 8Ć54 Troubleshooting Tips 8Ć55 Service Configuration Plot 8Ć56 EEROM Text Block 8Ć57 EEROM Map 8Ć58 9 Print Quality Print Quality Troubleshooting Checklist 9Ć2 Print Modes 9Ć5 PrintĆMode - HP 750c | Service Manual - Page 11
10Ć3 Part Number 10Ć3 Revision Letter 10Ć3 Firmware Revision Level 10Ć3 Plotter Support Information on the World Wide Web 10Ć4 Service Notes 10Ć5 Firmware History for HP DesignJets 750C and 755CM (Model A 10Ć5 Problems with the Entry Platen 10Ć10 Problems that Cause Paper Advance Errors 10 - HP 750c | Service Manual - Page 12
the user to refer to the instruction manual in order to protect against damage in the manner described in the installation (operating) manual, and before operating the equipment. Frame or chassis cut yourself on the encoder strip inside the plotter. CBFBUBTBeBmBl The CAUTION sign denotes a hazard. - HP 750c | Service Manual - Page 13
1 Product Information 1-1 - HP 750c | Service Manual - Page 14
Description Applications The HP DesignJet 700 (monochrome), HP DesignJet 750C and 750C Plus (color) and HP DesignJet 750CM are largeĆformat, inkĆjet plotters/printers that print output from software applications, on paper and other media. The plotters/printers produce largeĆformat plots of high - HP 750c | Service Manual - Page 15
The following network operating systems are supported through an optional MIO external network interface: D Novell Netware (Ethernet) D LAN Manager D Token Ring network D Apple LocalTalk D HP external controller D TCP/ICP host work station D Ethertalk Memory 700 DesignJet 700 plotters have 5.5 MB - HP 750c | Service Manual - Page 16
This table is for DesignJets 750C Plus and 755CM (model C3198B). Plus 755 CM Plot/Print Quality Monochrome Color Fast Normal Best 300 x 300 dpi 600 x 600 dpi 600 x 600 dpi 300 x 300 dpi, dot depleted 300 x 300 dpi 600 x 600 dpi addressable 700 Plot/Print Quality Fast Normal Best Monochrome - HP 750c | Service Manual - Page 17
Supported standard sizes are as follows: ANSI ISO Metric Oversize Architectural JIS D/A1-size plotters A, B, C, D A4, A3, A2, A1 A2, A1 C, D A4, A3, A2, A1 B4, B3, B2 E/A0-size plotters size plotters E/A0-size plotters 210 - 1625 mm 8.3 - 64 in 210 - 1625 mm 8.3 - 64 in 210 - 625 mm 8.3 - 24.6 - HP 750c | Service Manual - Page 18
pigmentĆbased black ink for sharper quality mono lines and text. D Better image quality via advanced imaging print modes. D Support for additional media including clear film, and several types of glossy paper. D Windows 95 support. D Much faster Windows driver that uses half as much memory and has - HP 750c | Service Manual - Page 19
2 Site Planning and Requirements 2-1 - HP 750c | Service Manual - Page 20
HP DesignJet 700, 750C, 750C Plus and 755 CM plotters/printers have selfĆadjusting power supplies and do not require a voltage selector or switch settings prior to use. The table below lists the power requirements for the plotters Cable part numbers ' Service Manual, chapter 11.) 2-2 Site - HP 750c | Service Manual - Page 21
Plotter/Printer With cartridges and media: Optimal print quality and media handling: Storage environment: Plotter/media Cartridges Idle specification assumes fan is off. Plotter Model: Height (window closed) Depth Length Weight Plotter Dimensions and Weight E/A0-size plotters 1200 mm (47.3 in) 675 - HP 750c | Service Manual - Page 22
Notes 2-4 Site Planning and Requirements C4705-90000 - HP 750c | Service Manual - Page 23
3 Installation and Configuration 3-1 - HP 750c | Service Manual - Page 24
and assemble the plotter, following the series of illustrations as follows. The capitals included in the frames correspond to the following plotters: D: DesignJet 700, 750C and 750C Plus (D/A1) E: DesignJet 700, 750C and 750C Plus (E/A0) CM: 755CM (E/A0) 3-2 Installation and Configuration - HP 750c | Service Manual - Page 25
C4705-90000 Installation and Configuration 3-3 - HP 750c | Service Manual - Page 26
3-4 Installation and Configuration C4705-90000 - HP 750c | Service Manual - Page 27
, notify the carrier and the nearest HP Sales and Support Office. Retain the shipping container and insulation material for the carrier's inspection. The Sales and Support Office will arrange for the repair or replacement of the plotter. Repacking the Plotter/Printer You can order a repacking kit if - HP 750c | Service Manual - Page 28
Assembling the Legs and Media Bin (Optional) If the user has purchased the optional legs and media bin for the plotter, assemble them following the series of illustrations below: 3-6 Installation and Configuration C4705-90000 - HP 750c | Service Manual - Page 29
C4705-90000 Installation and Configuration 3-7 - HP 750c | Service Manual - Page 30
3-8 Installation and Configuration C4705-90000 - HP 750c | Service Manual - Page 31
C4705-90000 Installation and Configuration 3-9 - HP 750c | Service Manual - Page 32
Installing the Plotter/Printer (Instructions ' User's Guide, chapter 1, Setting up your plotter) Using the Plotter (Instructions ' User's Guide) 750C DesignJet 750C/750C Plus/755CM Front Panel 750C Plus 755 CM Display section Status lights Action keys Plotting mode keys 3-10 Installation and - HP 750c | Service Manual - Page 33
700 DesignJet 700 Front Panel Display section Status lights Action keys Plotting mode keys ThirdĆParty Inks and OffĆAxis Ink Systems HP does not support thirdĆparty inks or offĆaxis ink systems for use with any of its DesignJet series plotters or printers. If a failure or damage to such HP - HP 750c | Service Manual - Page 34
settings. D Upgrade the plotter with more memory (not applicable to the DesignJet 755CM). Verifying Plotter Operation The plotters contain several types of internal operational checks and tests to ensure that the plotter is properly functioning and to help identify problems if any are detected - HP 750c | Service Manual - Page 35
setup -> I/O timeout 30 Min Pen settings -> Palette * Merge Software Off HP DesignJet 750C/PS Printer 35 12 9 0.35 19 10 0.35 27 11 0.35 Plotter setup -> * Lightness Normal * Graphics language 7586, HP-GL/2 * Terminator Normal * PostScript scale 129% * Skew tolerance * Cartridge check - HP 750c | Service Manual - Page 36
Notes 3-14 Installation and Configuration C4705-90000 - HP 750c | Service Manual - Page 37
4 Preventive Maintenance 4-1 - HP 750c | Service Manual - Page 38
at the back of the carriage, and from the slider path along which the bushing moves. Belt Swelling To prevent new belts from swelling incorrectly, keep them in their bags with dissicant until you need to install them. Cleaning the Plotter To maintain the plotter in good operating condition, keep - HP 750c | Service Manual - Page 39
plots that the throughput allows, exceeding by far the limit of the design. When this happens the customer runs into print quality problems and continuous plotter failures. The purpose of scheduled preventive maintenance is to avoid these failures Ć ensuring a good performance during all the product - HP 750c | Service Manual - Page 40
procedure should be performed only by HP trained personnel: otherwise personal injury may occur. If ink is spilled on the drive roller, remove the ink. Due to the ink's reflectance, ink on the roller can disrupt the plotter's edgeĆsensing function. To remove any ink from the roller, perform the - HP 750c | Service Manual - Page 41
cloth to remove the ink particles and dust. D Replace the YĆaxis motor. D Replace the encoder strip. EEROM Counters Mandatory Zero Resets After the repairs have been performed, follow the menu instructions to reset the plot cycle counter to zero. Reset the counter of carriage cycles when: D YĆmotor - HP 750c | Service Manual - Page 42
Notes 4-6 Preventive Maintenance C4705-90000 - HP 750c | Service Manual - Page 43
5 Functional Overview 5-1 - HP 750c | Service Manual - Page 44
network. The main processor reads BiĆtronics, HPĆIB, and Ethernet communications through the port it uses to read memories (ROM or DRAM). Plotting HP DesignJet 700, 750C, 750C Plus and 755CM plotters/printers accept plots in the following forms: D HewlettĆPackard Graphics Language (HPĆGL). D Hewlett - HP 750c | Service Manual - Page 45
Electronics Block Diagram BITRONICS RS-232-C FRONT PANEL X-AXIS ENCODER MEDIA SENSOR PINCH WHEEL SENSOR MAIN BOARD X-AXIS SEMNOSOTORR Y-AXIS MOTOR MIO CARD CARÏÏÏÏÏÏRIAGÏÏÏÏÏÏEBOAÏÏÏÏÏÏRD PRIMER STEPPER MOTOR BAIL STEPPER MOTOR WIPER STEPPER MOTOR DROP DETECTOR PRIMER SENSOR POWER SUPPLY - HP 750c | Service Manual - Page 46
main processor with information from the plotter sensors. The sensors give the main processor the ability to check status conditions. The servo processor controls the: D Servo motors. D Front panel. D Fan. D Sensors. D Electrically erasable readĆonly memory (EEROM). D Stepper motors. Stepper Motors - HP 750c | Service Manual - Page 47
) motor is mounted under the plotter's right endcover. It is electrically connected to the main PCA, which contains a carriageĆmotor driver. Its drive shaft is mechanically connected to the carriage via a drive belt. When the carriage motor rotates, it moves the carriage assembly. An optical encoder - HP 750c | Service Manual - Page 48
the main PCA. In DesignJets 700, 750C Plus and 755CM the media motor has a zero position which is indicated to the main PCA via the encoder. Primer Stepper Motor The primer stepper motor is mounted on the plotter's left sideĆplate and connects to the main PCA through the serviceĆstation cable. It is - HP 750c | Service Manual - Page 49
connected to the main PCA. Drop Sensor The drop sensor is an infrared detector mounted in the service station. It is used to test whether the nozzles in the cartridges are operating properly. It is part of a dropĆdetection system that measures the time from the firing of a nozzle to the sensing of - HP 750c | Service Manual - Page 50
an external controller by way of one of the plotter interfaces, it is stored in DRAM. When the carriage ASIC asserts shutdown during an access cartridges command. D Between swath printing. D When idle. Carriage PCA The carriage PCA contains an ASIC that controls the operation of the cartridge drivers - HP 750c | Service Manual - Page 51
causes the media motor to drive the media down, over the entry platen and out of the plotter. The PA signal to the carriageĆmotor driver causes the carriage motor to drive the carriage toward the right side of the plotter. The PB signal to the carriageĆmotor drives the carriage towards the left side - HP 750c | Service Manual - Page 52
LEDs on the HP DesignJet 700). D A 10Ćbutton key pad. The servo processor on the main PCA writes serially to the VFD and the LEDs and reads the key pad on its input/output lines. It provides local control, configuration and testing of the plotter and displays various plotter conditions. Drop Sensor - HP 750c | Service Manual - Page 53
6 Removal and Replacement 6-1 - HP 750c | Service Manual - Page 54
the YĆAxis Motor Holder 6Ć32 Removing the Cutter 6Ć33 Removing the Cartridge Carriage and Drive Belt 6Ć34 Removing the Trailing Cable 6Ć36 Reinstalling the Trailing Cable 6Ć39 Removing the Starguard Assembly 6Ć40 Removing the Primer 6Ć41 Removing the Service Station 6Ć42 Removing the - HP 750c | Service Manual - Page 55
and instructions before you service the plotters. Follow these warnings and cautions for your protection and to avoid damaging the plotter. circuits (ICs) in carpeted areas. 3 Do not remove an IC or a printed circuit assembly (PCA) from its conductive foam pad or conductive packaging until you are - HP 750c | Service Manual - Page 56
. T8 T9 T10 T15 T20 T25 Pozidrive PZ1 screwdriver. and 3/16 5.5 inch mm Small flatĆblade screwdriver. Nut driver with the indicated attachments. NeedleĆnose pliers. Spring hook. 6-4 Removal and Replacement 10X Magnifier. Loopback connector (HP Part Number 07440Ć60302). C4705-90000 - HP 750c | Service Manual - Page 57
interface cable(s) are not connected to it. 2 At the back of the plotter, ensure that the two small wire clamps of the parallel port are positioned attach the cover to the electronics enclosure. D/A1Ćsize plotters have six screws. E/A0Ćsize plotters have eight screws. 4 Gently lift up the cover to - HP 750c | Service Manual - Page 58
5 Push the cover up so that the tabs can slide out of the slots at the top of the electronics enclosure. 6 Carefully pull the cover clear of the plotter. 6-6 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 59
need to remove it. 1 Read ESD Precautions ' page 6Ć3. 2 Unscrew the SIMM cover at the back of the plotter and remove it. 3 Locate the DRAM SIMM slots, using the second from the right first. CODE POST RAM 4 Hold the module with its nonmetallic edge towards you and the small notch down. 5 Press - HP 750c | Service Manual - Page 60
/ROM SIMM): 1 Read ESD Precautions ' page 6Ć3. 2 Unscrew the SIMM cover at the back of the plotter and remove it. 3 Take the memory module out of its bag, holding the module only by the edges. 4 Hold the memory module by its edges with the nonĆmetallic edge toward you and the notch facing down - HP 750c | Service Manual - Page 61
Ćbased diagnostics ' page 8Ć54. 2 Remove the two screws from the serial (RSĆ232ĆC) connector. 3 Remove the two screws from the parallel connector. 3/16 inch Tx 10 C4705-90000 Removal and Replacement 6-9 - HP 750c | Service Manual - Page 62
Carriage motor Pinch-wheel sensor Bail stepper P18 Primer stepper X - Media motor RAM RAM POST CODE SIMM's connectors M-10 screws. 6 Lift the main PCA clear of the plotter. Tx 10 Calibrations: After installing a new main PCA, if the ' page 7Ć6. 6-10 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 63
and the dc powerĆdistribution connector from the powerĆsupply PCA. 3 Remove the screws that attach the powerĆsupply PCA to the electronics enclosure. Tx 10 dc power-distribution connector ac connector 4 Lift the powerĆsupply PCA clear of the plotter. C4705-90000 Removal and Replacement 6-11 - HP 750c | Service Manual - Page 64
the attachment clip. 3 Remove the two screws that attach the fan to the electronics enclosure. Tx 15 LONG TIP 4 Lift the fan clear of the plotter. 6-12 Removal and Replacement Reassembling: Airflow should be inwards. See indication on fan. C4705-90000 - HP 750c | Service Manual - Page 65
window up more than is necessary, so as not to strain or break the left pivot. 4 Move the window to the right so that the left pivot slides out of its socket. Lift the window clear of the plotter. Do not let the windowĆpivot springs drop out of the endcovers. C4705-90000 Removal and Replacement - HP 750c | Service Manual - Page 66
damage the strip. 2 Loosen the two latch screws on the underside of the center cover. 3 Slide the two latches horizontally towards the center of the plotter, clear of the two endcovers. 6-14 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 67
of the electronicsĆenclosure cover and the top two rear screws. D/A1 size plotters have four screws. E/A0 have six. When reassembling, first tighten the rear screws. Tx 15 5 Slide the center cover out from under the screws and lift it clear of the plotter. C4705-90000 Removal and Replacement 6-15 - HP 750c | Service Manual - Page 68
window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the two screws on the left trim. Tx 15 CFUTION Reassembling: When replacing screws on any plastic part, always begin by gently twisting the screw in an anticlockwise direction with your hand, until the screw finds the thread path - HP 750c | Service Manual - Page 69
window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the two screws on the right trim. Tx 15 CFUTION Reassembling: When replacing screws on any plastic part, always begin by gently twisting the screw in an anticlockwise direction with your hand, until the screw finds the thread path - HP 750c | Service Manual - Page 70
of the cartridge carriage or motor gears. 6 Release the frontĆpanel cable from its connector on the main PCA. Front-panel PCA 7 Release the frontĆpanel cable by pulling out its holding clips. 8 Lift the FrontĆPanel Assembly clear of the plotter. 6-18 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 71
To help with maintenance, push the frontĆpanel assembly onto the right end of the rollfeed where the clamps will hold it in place. C4705-90000 Removal and Replacement 6-19 - HP 750c | Service Manual - Page 72
cover ' page 6Ć5. 2 Remove the window ' page 6Ć13. 3 Remove the center cover ' page 6Ć14. 4 Remove the right endcover ' page 6Ć17. 5 Slide the connector out from the two pivots. 6 Disconnect the windowĆsensor cable connector from the frontĆpanel assembly. 6-20 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 73
Removing the PinchĆWheel Sensor 1 Remove the window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the sensor to the right sideplate. Tx 10 Pinch-wheel sensor 7 Move the pinchĆwheel sensor, including the cable, clear of the plotter. C4705-90000 Removal and Replacement 6-21 - HP 750c | Service Manual - Page 74
Removing the Media Sensor 1 Remove the electronicsĆenclosure cover ' page 6Ć5. 2 Remove the window ' page 6Ć13. 3 Remove the center cover ' page 6Ć14. 4 Remove the right endcover ' page 6Ć17. 5 Disconnect the mediaĆsensor cable connector from the main PCA. Media - HP 750c | Service Manual - Page 75
underside of the entry platen. CAUTION Take care not to cut the mediaĆsensor cable itself. 9 Lift the media sensor and cable clear of the plotter Reassembling: Ensure that the two flags on the media sensor are correctly positioned. Plastic tie C4705-90000 Removal and - HP 750c | Service Manual - Page 76
Ćmotor to the structure. Hold the motor in a secure position. Tx 15 6-24 Removal and Replacement Reassembling: Position the YĆaxis drive belt before positioning the screws, and ensure that the belt is correctly positioned around the carriageĆmotor gear and the lower part of the pulley. C4705-90000 - HP 750c | Service Manual - Page 77
Ćmotor cable from the main PCA (connector labelled X). X-Carriage motor 6 Remove the spittoon ' page 6Ć44. 7 Remove the two screws that attach the driveĆroller gear to the driveĆroller shaft. Tx 10 8 Remove the driveĆroller gear from the driveĆroller shaft. The gear may be stiff to remove. C4705 - HP 750c | Service Manual - Page 78
the media motor to the mediaĆmotor mount. Tx 15 10 Pull the media motor towards the rear of the plotter. 11 Disconnect the flat encoder cable from the motor, and lift the motor clear of the plotter. Reinstalling: The worm pinion and driveĆroller gear mesh slightly during use. Do not install a new - HP 750c | Service Manual - Page 79
care neither to cut yourself on the encoder strip, nor to damage the strip. 1 Remove the window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the right endcover a flat surface when it is not in the plotter. 5 Remove the nut and washer that attach the encoder strip to the bracket on the - HP 750c | Service Manual - Page 80
7 Carefully pull the encoder strip through and out of the carriage assembly. 8 Lay the encoder strip on a flat surface. Reinstalling: See following procedure. 6-28 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 81
oriented with the transparent area down. 2 Feed the strip through the apertures in the cartridgeĆcarriage assembly. 3 Use a washer and screw to attach the encoder strip to the bracket on the left side of the plotter. Tx 10 4 Use a washer and screw to attach the encoder strip to the bracket on the - HP 750c | Service Manual - Page 82
5 Slide the carriage along the length of its travel to ensure free movement. Make sure that the encoder strip does not bind or rub on the carriage. 6-30 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 83
right endcover ' page 6Ć17. 5 Remove the encoder strip ' page 6Ć27. 6 Slide the cartridge carriage towards the center of the plotter to get access to the tensioner. 7 Remove the YĆaxis motor ' page 6Ć24. 8 Remove the screws that attach the YĆtensioner housing. 9 Remove the YĆtensioner housing. Tx - HP 750c | Service Manual - Page 84
the window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the right endcover ' page 6Ć17. 4 Remove the YĆaxis motor ' page 6Ć24. 5 Remove the two screws that attach the YĆaxis motor holder to the structure. 6 Remove the YĆaxis motor holder. 6-32 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 85
window ' page 6Ć13. 2 Remove the right endcover ' page 6Ć17. 3 Remove the YĆaxis motor holder ' page 6Ć32. 4 Holding the cutter wheels in towards the center of the cutter carriage plotter. Reassembling: Ensure that the cutter is over the overdrive blade. C4705-90000 Removal and Replacement 6-33 - HP 750c | Service Manual - Page 86
page 6Ć32. 9 Remove the cutter ' page 6Ć33. 10 Slide the cartridge carriage to the right side of the plotter. 11 Hold the carriage rear bushing (mounted on the rear slider rod) and move the carriage to the right side of the plotter and free from the slider rods. 6-34 Removal and Replacement C4705 - HP 750c | Service Manual - Page 87
plotter. 13 Remove the drive belt from the carriage assembly. Calibration: After reassembling the plotter, perform: D Pen alignment test ' page 8Ć40. D LineĆsensor calibration ' page 7Ć5. D Accuracy calibration ' page 7Ć6. D DropĆdetect calibration ' page 7Ć4. C4705-90000 Removal and Replacement - HP 750c | Service Manual - Page 88
the Trailing Cable 1 Remove the window ' page 6Ć13. 2 Remove to disconnect the trailingĆcable connectors from the carriage PCA. Reassembling: The connector will have the the cable is positioned correctly. 8 Remove the cable guide from the carriage PCA by pulling the sides out to unclip them and - HP 750c | Service Manual - Page 89
9 Remove the trailingĆcable guide clip by pressing out its legs. 10 Gently force apart one corner of the guide and the trailing cable. This will release the cable from the retaining mechanism at . Release the trailing cable passing it through the ferrites. C4705-90000 Removal and Replacement 6-37 - HP 750c | Service Manual - Page 90
14 Remove the clip from the lower trailing cable holder. Lower trailing-cable holder 6-38 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 91
LENGTH ADJUSTMENT 1 Move the carriage to the maximum rightĆend cm. ANGULAR ADJUSTMENT 1 Loosen the screw that attaches the lower trailingĆcable holder to the chassis. 2 Perform the angular adjustment to align the trailing cable with the slider rods and belt. C4705-90000 Removal and Replacement - HP 750c | Service Manual - Page 92
Removing the Starguard Assembly 1 Remove the window ' page 6Ć13. 2 Remove the left endcover ' page 6Ć16. 3 Remove the right endcover ' the top of the starguard assembly toward the rear of the plotter so that it clears the sideplate. Right Starguard Screws (2) Left Starguard Screws (2) Tx 20 6-40 - HP 750c | Service Manual - Page 93
Removing the Primer 1 Remove the window ' page 6Ć13. 2 Remove the left endcover ' page 6Ć16. 3 Disconnect the primer assembly and sensor cable the primer assembly to the left sideplate. 6 Slide the primer assembly out of the plotter. 1 Tx 20 C4705-90000 2 3 Removal and Replacement 6-41 - HP 750c | Service Manual - Page 94
avoid staining your hands and clothing with ink deposited in the service station. 1 Remove the window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the left endcover ' page 6Ć16. 4 Move the cartridge carriage to the center of the plotter. 5 Disconnect the four rubber tubes from the - HP 750c | Service Manual - Page 95
tighten the left upper screw as shown. Prevent any slackness or motion of the service station while it is being screwed in place. This is very important. 3 torque screws or place them incorrectly Calibration: After reassembling the plotter, perform: D Accuracy calibration ' page 7Ć6. D DropĆdetect - HP 750c | Service Manual - Page 96
be full of ink. 5 Remove the screws that attach the spittoon to the structure. 6 Remove the spittoon. Tx 15 Reassembling: Ensure that the spittoon is properly attached to the YĆaxis motor holder and that it does not interact with the cartridge carriage. 6-44 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 97
Removing the Bail Assembly 1 Open the window. 2 Move the cartridgeĆcarriage to the left side of the plotter. WĂAĂRĂNĂIĂNĂG In the following step, take care not to cut yourself on the the sideplates. Lift the bail assembly up and clear of the plotter. C4705-90000 Removal and Replacement 6-45 - HP 750c | Service Manual - Page 98
window ' page 6Ć13. 2 Remove the left endcover ' page 6Ć16. 3 Remove the primer ' page 6Ć41. 4 Remove the service station ' page 6Ć42. 5 Locate the three stepper motors. Primer stepper motor Bail stepper motor Wiper stepper motor Service Tx 10 6-46 Removal and Replacement Reassembling: Rest the - HP 750c | Service Manual - Page 99
Removing the Cable Assembly 1 Remove the window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the electronics enclosure cover ' page 6Ć5. bottom screws. 9 Swing the electronics enclosure outwards on its hinges. 10 Release the cable assembly. C4705-90000 Removal and Replacement 6-47 - HP 750c | Service Manual - Page 100
cluster gear from the plotter. 16 Remove the screw from the top of each of the overdrive support mounts. Tx 20 Cluster gear Reassembling: Ensure that you install the clutch as shown in the figure. If you install it in reverse, it will cause inkĆsmearing and paper jam problems. 17 Pull the right - HP 750c | Service Manual - Page 101
17. 7 Remove the frontĆpanel assembly ' page 6Ć18. 8 Remove the carriage motor ' page 6Ć24. 9 Remove the media motor ' page 6Ć25. 10 Remove the encoder strip ' page 6Ć27. 11 Remove the bail assembly ' page 6Ć45. 12 Remove the service station ' page 6Ć42. 13 Remove the overdrive assembly ' page 6Ć48 - HP 750c | Service Manual - Page 102
at the right end of the drive roller is seated in the right sideplate and completely on the right side of the axial bias plate. Calibration: After reassembling the plotter, perform: D Accuracy calibration ' page 7Ć6. D DropĆdetect calibration ' page 7Ć4. 6-50 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 103
spring anchor pins. 3 Loosen the two nuts that attach each end of the rollfeed cover to the pivots. 4 Pull the rollfeed cover clear of the plotter. Tx 10 C4705-90000 Removal and Replacement 6-51 - HP 750c | Service Manual - Page 104
. 3 Remove the rollfeed cover assembly ' page 6Ć51. 4 Remove the three screws that attach the rollfeed module assembly to each sideplate. 1 Tx 20 1 2 3 3 2 6-52 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 105
Removing the Entry Platen 1 Remove the window ' page 6Ć13. 2 Remove the center cover ' page 6Ć14. 3 Remove the left endcover ' page 6Ć16. 4 Remove the right endcover ' page 6Ć wedge screws that attach the entry platen to the left and right sideplates. Tx 15 C4705-90000 Removal and Replacement 6-53 - HP 750c | Service Manual - Page 106
8 Pull the entry platen down, forward and clear of the plotter. 6-54 Removal and Replacement C4705-90000 - HP 750c | Service Manual - Page 107
screw from the right sideĆplate. 6 Pull the cutterĆenclosure assembly forward and clear of the plotter. Tx 15 Upper screw Cutter-enclosure assembly Upper screw Wedge screw 7 To remove the media guides from the cutter enclosure, grasp each one firmly, twist it counterĆclockwise, and pull it clear - HP 750c | Service Manual - Page 108
Media Diverter 1 Remove the window ' page 6Ć13. 2 Remove the left endcover ' page 6Ć16. 3 Remove the right endcover ' page 6Ć17. 4 Remove the encoder strip ' page 6Ć27. 5 Remove the bail assembly ' page 6Ć45. 6 Remove the overdrive assembly ' page 6Ć48. 7 Remove the driveĆroller assembly ' page 6Ć49 - HP 750c | Service Manual - Page 109
Assemblies 1 Remove the drive roller assembly ' page 6Ć49. 2 Push the pinchĆarm lever (located on the right side of the entry platen) into the down position. 3 On the right side of the plotter, disconnect the rockerĆ the action of the pinchĆarm lever. C4705-90000 Removal and Replacement 6-57 - HP 750c | Service Manual - Page 110
plotter with your left hand. 7 Reach around to the front of the plotter and push the top of the bar cam slightly towards the rear of the plotter arm assembly towards the rear of the plotter against its spring tension, slide the assembly Bushing Spring Pinch-arm assembly 10 Repeat the steps 8 and 9 - HP 750c | Service Manual - Page 111
7 Calibrations 7-1 - HP 750c | Service Manual - Page 112
required on DesignJet 700, 750C, 750C Plus plotters and DesignJet 755CM printers. Calibrations The plotters/printers have several calibration Sensor Carriage is replaced or disassembled Yes Yes Cartridge checking constantly rejects pens Yes No Drive roller assembly is replaced Yes - HP 750c | Service Manual - Page 113
subset of the Utilities" menu. Entering the Service Tests Menu System 1 Switch the plotter ON. Certain plotter failures that can occur will prevent the plotter from reaching the "STATUS / Ready for Media" state. If one of these problems occurs, switch the plotter OFF. Press and hold down the ENTER - HP 750c | Service Manual - Page 114
restoring the EEROM values. D Cartridge checking algorithm continues to reject pens. D Service station is replaced or disassembled. D Drive roller assembly is replaced. D Carriage is replaced. You will also need to perform the drop detect calibration whenever these system errors appear on the front - HP 750c | Service Manual - Page 115
light which will vary for different types of media. The normal range of this number should be between 0 and 56. 4 If the calibration fails, an Error Code is displayed on the frontĆpanel. If the calibration fails the test: 1 Replace the carriage ' page 6Ć34. C4705-90000 Calibrations 7-5 - HP 750c | Service Manual - Page 116
the EEROM values. D Drive roller assembly is replaced. D XĆaxis motorĆencoder is replaced. D Service Station is replaced or disassembled. D Carriage is replaced or disassembled. D Mark Encoder is replaced. Before performing the accuracy calibration, print a service configuration plot (details - HP 750c | Service Manual - Page 117
edge print side down 13 The plotter will load the plot and then measure the alignment marks using the line sensor on the pen carriage. 14 If the calibration passes, the Success Calibration / Press Enter" message is displayed on the frontĆpanel. Press Enter to return to the Service Tests submenu - HP 750c | Service Manual - Page 118
Notes 7-8 Calibrations C4705-90000 - HP 750c | Service Manual - Page 119
8 Troubleshooting 8-1 - HP 750c | Service Manual - Page 120
is not detected the display shows Cartridge Missing". If any of the color cartridges is not detected, the plotter is set to monochrome mode (only applicable to DesignJets 750C, 750C Plus and 755CM). 9 If sheet media is loaded, it is pulled into the plotter. 10 The mark encoder is located by the - HP 750c | Service Manual - Page 121
Main carriage Ortho wiper initialization Window sensor Initialize Y-axis Primer Cartridge voltage setting: TTOE & BPW calibration if required Memory tests: - ROM - RAM - Swath RAM - RAM SIMMs (Test cancelled when other tests complete) Drop detector - Test signal - Calibration Check Pinch - HP 750c | Service Manual - Page 122
07xxxx Type of Problem Hardware Failure Software/Memory Failure Hardware Problem MIO System Failure Pen Alignment System Error Drop Detect System Error Service Tests The plotter has many internal service tests that can be used in troubleshooting. Instructions for entering the service tests menu - HP 750c | Service Manual - Page 123
continue, then reload the calibration plot. Follow front panel instructions. D Plotter could not find the edge of the media during the loading procedure using the optical sensor on the carriage. Note which carriage side failed (left or right). Check the leading edge of the media for unevenness; cut - HP 750c | Service Manual - Page 124
on the roll core. Reload media with the right edge no more than 0.2 inches (0.5 cm) from the perforated line on the entry platen. D Remove any ink deposits on the drive roller ' page 4Ć3. Ink deposits are reflective and can give false indications for detecting media edges. D Sheet is mispositioned - HP 750c | Service Manual - Page 125
as required to ensure compatibility. You cannot change the handshake setting in the plotters front panel. D Pen checking is ON and an error has been detected. Press the Up Arrow button if you want to service the cartridges (replace or reseat). Press the Down Arrow button if you want to continue - HP 750c | Service Manual - Page 126
message. D The meaning of the error codes is explained on page 8Ć9. Wrong Cartridge Type D You have loaded one or more incompatible cartridges. Replace the cartridges with those appropriate for this plotter. If the message continues, then perform the carriage test (details ' page 8Ć27) and the - HP 750c | Service Manual - Page 127
on Troubleshooting Error Codes Before spending time troubleshooting the problem by doing the various tests or replacing parts (which may not need replacing), check which firmware revision the plotter is using or check if a service note deals with this particular problem (refer to chapter 10 for - HP 750c | Service Manual - Page 128
Error Code 010001 Problem Description Window sensor circuitry not operating correctly. Corrective Actions D Check the window sensor switch. D Check that the sensor cable is connected to the frontĆpanel PCA. D Disconnect the sensor cable connector from the frontĆpanel PCA, and read the - HP 750c | Service Manual - Page 129
Error Code 010030 Problem Description Failed communications between the carriage and main processors. Corrective Actions D For all 01003X codes, check the trailing cable connections and continuity. D If required, replace the: D Main PCA ' page 6Ć9. D Carriage assembly ' page 6Ć34. D Trailing cable - HP 750c | Service Manual - Page 130
entered into the UART. Check the handshake settings in the software application configuration. D Replace the main PCA ' page 6Ć9. D If the problem remains, report the problem to the HP Response Center or the nearest HP Support Office. 020001 020002 Memory fragmentation error. D Turn Queing to OFF - HP 750c | Service Manual - Page 131
. Cards with version 5 or below can not be used with this plotter. Version 5.1 cards behave as expected but do not support PML instructions. D Install the latest version of the MIO card. 05xxxx MIO system error. D Check/replace the main PCA ' page 6Ć9. 06030A Mark position not found. D Perform - HP 750c | Service Manual - Page 132
the service station ' page 6Ć42. D To verify the functionality of the YĆaxis drive system, perform the: D YĆaxis friction test ' page 8Ć45. D YĆstatic friction test ' page 8Ć46. D YĆaxis encoder test ' page 8Ć47. 750C 750C 070006 As 070005 for cyan pen. D See Error Code 070005. Plus 755 CM - HP 750c | Service Manual - Page 133
Error Code 070010 Problem Description False drops detected during power on. Corrective Actions D Check for noise on the line voltage. D Perform the drop detect calibration ' page 7Ć4. D Causes also include: D A noisy power supply D A bad drop detect sensor D An acoustically noisy - HP 750c | Service Manual - Page 134
Error Code Problem Description 070100 Firmware error 0000D8 Firmware error XXXXXXXX 080001 Post Script error Corrective Actions D Report the error to the HP Response Center or the nearest HP Support Office, stating the following information: D the complete error number. D service configuration plot - HP 750c | Service Manual - Page 135
of all internal service tests available in the plotters. Instructions for entering the service tests menu are plotter model (not applicable to the DesignJet 700). This test also allows you to view (get) which plotter model is currently set. 4 MIO ' page 8Ć24 The purpose of this test is to check - HP 750c | Service Manual - Page 136
test is to check if the cartridge nozzles function correctly. 13 Mono PQ Plot ' page 8Ć33 The purpose of this test is to check the print quality in monochrome at 600 dpi. 750C 14 Color PQ Plot ' page 8Ć34 750C Plus The purpose of this test is to check the line attributes in color. 755 CM 15 Area - HP 750c | Service Manual - Page 137
to verify the operation of the window sensor. 31 Pinchwheel Sensor ' page 8Ć52 The purpose of this test is to verify the operation of the pinchwheel sensor. 32 Button Test ' page 8Ć53 The purpose of this test is to verify the operation of the frontĆpanel buttons. C4705-90000 Troubleshooting 8-19 - HP 750c | Service Manual - Page 138
all the way to the bottom of its travel. If the plotter hangs up during a test, switch the plotter OFF and restart from step 1. In some cases the plotter may revert to the "STATUS" message upon exiting a test. To return to the service menu, perform the above steps. 8-20 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 139
frontĆpanel. Press Enter to return to the Service Tests submenu. 6 If the test fails, the clearing the EEROM, switch the plotter OFF and ON again without printed from the Utilities" menu for setup reference. You will also need to reconfigure the frontĆpanel settings. C4705-90000 Troubleshooting - HP 750c | Service Manual - Page 140
on the frontĆpanel: D Carriage cycles counter reset" if the carriage counter is reset. D Plots counter reset" if the plots counter is reset. 5 Press Enter if another counter needs to be reset or press Previous if you want to return to the Service Tests submenu. 8-22 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 141
EEROM Model Type 750C Plus The purpose of this test is to set the correct plotter model (not applicable to the DesignJet 755 CM 700). This test also allows you to view (get) which plotter model is currently set. Set or view the plotter model as follows: 1 In the Service Tests submenu, scroll - HP 750c | Service Manual - Page 142
In the Service Tests submenu, scroll to 4 MIO" and press Enter. SERVICE TESTS 4 MIO 2 The ReĆinitializing MIO" message is displayed on the frontĆpanel while the plotter checks the perform the MIO test again. 3 Replace the MIO card and perform the MIO test again. 8-24 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 143
. 4 If the test fails, an Error Code is displayed on the frontĆpanel. If the Main PCA fails the test: 1 Save the EEROM values (to be used in the new Main PCA) ' page 8Ć54. 2 Replace the main PCA ' page 6Ć9. 3 Save the EEROM values in the new Main PCA ' page 8Ć54. C4705-90000 Troubleshooting 8-25 - HP 750c | Service Manual - Page 144
on the frontĆpanel. 4 If the test fails, an Error Code is displayed on the frontĆpanel. If the test fails, try replacing one of the following components: 1 Main PCA ' page 6Ć9. 2 Carriage assembly ' page 6Ć34. 3 Trailing cable ' page 6Ć36. Only replace one component at a time and perform the Main - HP 750c | Service Manual - Page 145
Test / Press Enter" message is displayed on the frontĆpanel. 4 If the test fails, an Error Code is displayed on the frontĆpanel. If the carriage fails the test, try replacing one of the following components: 1 Carriage assembly ' page 6Ć34. 2 Main PCA ' page 6Ć9. 3 Trailing cable ' page 6Ć36. Only - HP 750c | Service Manual - Page 146
" and press Enter. SERVICE TESTS 8 Thermal control 700 2 The plotter will automatically test the black cartridge. 750C The Select a Position" message is displayed on the frontĆpanel. Use the Arrow buttons 750C Plus to select the cartridge that needs to be tested. 755 CM 3 Press the Enter - HP 750c | Service Manual - Page 147
is displayed on the frontĆpanel. 700 3 The plotter will automatically calibrate the black cartridge. 750C The Select a Position" message is displayed on the frontĆpanel. Use the Arrow buttons 750C Plus to select the cartridge that needs to be tested. 755 CM 4 Press the Enter button. 5 The - HP 750c | Service Manual - Page 148
(s) and the carriage. For each cartridge, the plotter checks the connection between one address and all the primitives (PS =) and viceĆversa (addr sel =). Perform the pen continuity test as follows: 1 In the Service Tests submenu, scroll to 10 Pen continuity" and press Enter. SERVICE TESTS 10 Pen - HP 750c | Service Manual - Page 149
has failed the test. To resolve the problem, try one of the following: 1 Check the part number of the cartridge. Is it the correct one for this plotter? 2 Clean the interconnect pad in the carriage or the cartridge that failed the test. 3 Replace the cartridge that failed the test. 4 Perform the - HP 750c | Service Manual - Page 150
2 Replace the cartridge(s) that failed the test. 3 Replace the carriage ' page 6Ć34. If the cartridge(s) need servicing: 1 Replace the cartridge(s) that failed the test and try the nozzle print test again. 2 If the problem occurs again, replace the service station ' page 6Ć42. 8-32 Troubleshooting - HP 750c | Service Manual - Page 151
PQ Plot The purpose of this test is to check the print quality in monochrome at 600 dpi. Perform the mono PQ plot test as follows: Load media before performing this test. 1 In the Service Tests submenu, scroll to 13 Mono PQ Plot" and press Enter. SERVICE TESTS 13 Mono PQ plot 2 The Unidirectional - HP 750c | Service Manual - Page 152
14. Color PQ Plot (Only Applicable to DesignJets 750C, 750C Plus and 755CM) 750C Plus The purpose of this test is to check the line attributes in color. 755 CM Perform the color PQ plot test as follows: Load media before performing this test. 1 In the Service Tests submenu, scroll to 14 Color PQ - HP 750c | Service Manual - Page 153
and press Enter. SERVICE TESTS 15 Area fill PQ plot 2 The Printing PRESS ENTER when finished" message is displayed on the frontĆpanel while the plotter produces the area fill PQ plot. 3 Press the Enter button when the test has been completed. 4 For more information on troubleshooting the area fill - HP 750c | Service Manual - Page 154
check the functionality of all the nozzles of the cartridges. Perform the pen nozzle detect test as follows: 1 In the Service Tests submenu, scroll to 16 Pen nozz. detect" and press Enter. SERVICE TESTS 16 Pen nozz. detect 700 2 The plotter will automatically test the black cartridge. 750C The - HP 750c | Service Manual - Page 155
, which is located in the service station. 8 If the test passes, the Sensor Good / Press Enter" message is displayed on the frontĆpanel. 9 If the test fails, the Sensor Bad / Press Enter" message is displayed on the frontĆpanel. Go to step 16 to troubleshoot the problem. C4705-90000 The test is - HP 750c | Service Manual - Page 156
. 750C Plus 14 The Testing open sensor in color mode" message is displayed on the frontĆpanel. 755 CM 15 troubleshoot the problem. 16 If any of the drop detector tests fail: 1 Check if the drop detector cable is connected to the main PCA. 2 Try replacing one of the following components: D Service - HP 750c | Service Manual - Page 157
the problem, try one of the following: 1 Clean the drive roller surface. 2 Perform the line sensor calibration ' page 7Ć5. 3 Perform the mainĆcarriage com test ' page 8Ć26. 4 Replace the carriage ' page 6Ć34. 4 Press the Enter button when the test has been completed. C4705-90000 Troubleshooting - HP 750c | Service Manual - Page 158
Error / Press Enter" message is displayed on the frontĆpanel when the alignment is completed, but the plot doesn't show any cartridge failures, then, to resolve the problem, try one of the following: 1 Replace the cartridge(s). 2 Perform the nozzle print test ' page 8Ć32. 8-40 Troubleshooting - HP 750c | Service Manual - Page 159
test will automatically stop. 4 Check the left side of the plotter to see if the ortho wiper is operating correctly. If there is no movement from the ortho wiper, then the test has failed. To resolve the problem, try replacing one of the following components: 1 Service Station ' page 6Ć42. 2 Cable - HP 750c | Service Manual - Page 160
on the frontĆpanel as the plotter begins the test on the primer. 9 If the test passes, the 21 Primer Test" message is displayed on the frontĆpanel. 10 If the test fails, an Error Code is displayed on the frontĆpanel. If the primer fails the test, try replacing one of the following components - HP 750c | Service Manual - Page 161
purpose of this test is to determine the power required to move the drive roller. Perform the X motion control test as follows: 1 In the Service Tests submenu, scroll to 22 X Motion Control" and press Enter. SERVICE TESTS 22 X Motion control 2 The Remove Media / Press Enter" message is displayed - HP 750c | Service Manual - Page 162
SERVICE TESTS 23 Mark position 2 The Remove Media / Press Enter" message is displayed on the frontĆpanel. Remove the media (if loaded) and press Enter to start the test. 3 The Looking for the Mark" message is displayed on the frontĆpanel while the plotter 7Ć6. 8-44 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 163
Replace the YĆaxis motor ' page 6Ć24. 3 Perform the YĆaxis encoder test ' page 8Ć47. 4 Replace the carriage ' page 6Ć34. 7 The PWM (Cut) = # / Press Enter" message is displayed on the frontĆpanel. This value (#) is for the cutter PWM and is for reference purposes only. C4705-90000 Troubleshooting - HP 750c | Service Manual - Page 164
The purpose of this test is to check the static friction of the carriage assembly at different postions along the YĆaxis. Perform the YĆstatic friction test as follows: 1 In the Service Tests submenu, scroll to 25 Y static friction" and press Enter. SERVICE TESTS 25 Y static friction 2 The Testing - HP 750c | Service Manual - Page 165
: Load media before performing this test. 1 In the Service Tests submenu, scroll to 26 YĆaxis Encoder" and press Enter. SERVICE TESTS 26 Y-axis encoder 2 The Testing Encoder Strip" message is displayed on the frontĆpanel while the plotter checks the encoder strip 3 If the test passes, the Encoder - HP 750c | Service Manual - Page 166
media before performing this test. 1 In the Service Tests submenu, scroll to 27 Cutter" and press Enter. SERVICE TESTS 27 Cutter 2 The Single Cut / as the plotter performs the test. The plotter continuously uses the cutter to cut the media until you press Enter. 8-48 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 167
' page 6Ć45. 3 Cable assembly ' page 6Ć47. 4 Main PCA ' page 6Ć9. Only replace one component at a time and perform the "Bail Stepper" test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. C4705-90000 Troubleshooting 8-49 - HP 750c | Service Manual - Page 168
components: 1 Media sensor ' page 6Ć22. 2 Main PCA ' page 6Ć9. Only replace one component at a time and perform the "Media Sensor" test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. 8-50 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 169
6Ć20. 2 FrontĆpanel assembly ' page 6Ć18. 3 Main PCA ' page 6Ć9. Only replace one component at a time and perform the "Window Sensor" test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. C4705-90000 Troubleshooting 8-51 - HP 750c | Service Manual - Page 170
6Ć21. 2 PinchĆarm assembly ' page 6Ć57. 3 Main PCA ' page 6Ć9. Only replace one component at a time and perform the "Pinchwheel Sensor" test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. 8-52 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 171
Service Tests submenu, scroll to 32 Button Test" and press Enter. SERVICE TESTS 32 replace one component at a time and perform the "Button" test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. C4705-90000 Troubleshooting - HP 750c | Service Manual - Page 172
based diagnostics are available by accessing the Plotter Support World Wide Web (WWW) site. This site can be found at the following address: http://plotterĆsupport.bpo.hp.com/ For more information about what is available on the Plotter Support WWW site ' page 10Ć4. 8-54 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 173
the slider path along which the bushing moves. Spittoon and ink separator: You need to replace these parts when they fill up with ink. (See ' chapter 4.) Drawer statement: HP does not support thirdĆparty inks or offĆaxis ink systems for use with any of its DesignJet series plotters or printers. If - HP 750c | Service Manual - Page 174
Service Configuration Plot The configuration plot aids in the analysis of plotter problems by providing: D A hardclip border around the plot so the margins can be measured. D Unique patterns for use in detecting cartridge nozzle problems, penĆtoĆpen alignment problems, inkĆflow problems and vertical - HP 750c | Service Manual - Page 175
memory location number instead of the contents at each position on the text block. You can find the contents of the memory addresses 64 10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30: 30 31 32 33 Service Area C4705-90000 Troubleshooting - HP 750c | Service Manual - Page 176
EEROM Map (The four hex digits on the right give the memory location, with the two rightmost digits giving the address on the table on page 8-57.) SERVICE AREA - EEROM Initialised variables EEROM_INTERNAL_INIT_A EEROM_INTERNAL_INIT_B EEROM_INTERNAL_VERSION - Mileage monitor variables - HP 750c | Service Manual - Page 177
(CMYK) - Last byte that can be used in the os zone EEROM_INTERNAL_SPARE (EEROM_INTERNAL_BLOCK_CHECKSUM-1) 0x32 - CRC checksum word EEROM_INTERNAL_BLOCK_CHECKSUM (EEROM_INTERNAL_SIZE-2) Checksum 0x33 to 0x34 C4705-90000 Troubleshooting 8-59 - HP 750c | Service Manual - Page 178
Notes 8-60 Troubleshooting C4705-90000 - HP 750c | Service Manual - Page 179
9 Print Quality 9-1 - HP 750c | Service Manual - Page 180
checklist as a guide in troubleshooting the problem: 1 Problem reproduction D Reproduce the problem that the customer is seeing using their original settings. 2 Printer configuration: D Cartridge check: Set to ON". D Print Mode: Set to Best" (in the printer and in the drivers). D Dry time - HP 750c | Service Manual - Page 181
) using HP Matte Film or HighĆGloss Film. If not available, use Coated media or opaque bond if required. D If you get an Alignment Error", ensure that the carriage does not have a pen insertion problem (refer to service note ' page 10Ć20) and replace it if necessary. C4705-90000 Print Quality 9-3 - HP 750c | Service Manual - Page 182
use Varware, try the following: D Print the same sample using the NonĆHP driver and their normal media. D Print one of the internal demos or perform the service test 15 Area fill PQ plot" (details ' page 8Ć35) using HP Media and configuring the plotter/printer as indicated previously. If the output - HP 750c | Service Manual - Page 183
Bond 755 CM This table is only applicable to DesignJets 750C and 755CM (C3198A). PRINT QUALITY Fast Normal Best PRINT DIRECTIONS Unidir/Bidir Unidir Bidir Bidir CARRIAGE SPEED IPS 18.33 18.33 18.33 RESOLUTION 300 300 300 NO. OF PASSES N 1 2 4 SWATH WIDTH IN 0.32 0.32 0.32 SWATHS/ ADVANCE - HP 750c | Service Manual - Page 184
18.33 300 4 0.32 750C Color plots on HeavyĆCoated Paper 750C Plus This table is only applicable to DesignJets 750C, 750C Plus and 755CM. 755 CM PRINT QUALITY PRINT DIRECTIONS CARRIAGE SPEED RESOLUTION NO. OF PASSES SWATH WIDTH Unidir/Bidir IPS N IN Fast Unidir 18 - HP 750c | Service Manual - Page 185
CM Color plots on Coated Paper This table is only applicable to DesignJet 755CM (C3198A). PRINT QUALITY Fast Normal Best PRINT DIRECTIONS Unidir/Bidir Unidir Unidir Unidir CARRIAGE SPEED IPS 18.33 18.33 18.33 RESOLUTION 300 300 300 NO. OF PASSES N 1 2 4 SWATH WIDTH IN 0.32 0.32 0.32 SWATH - HP 750c | Service Manual - Page 186
NO. OF PASSES N 1 2 4 4 SWATH WIDTH IN 0.32 0.32 0.32 0.32 750C Color plots on Matte Film 755 CM This table is only applicable to DesignJets 750C and 755CM (C3198A). PRINT QUALITY Fast Normal Best PRINT DIRECTIONS Unidir/Bidir Bidir Bidir Bidir CARRIAGE SPEED IPS 18.33 18.33 18.33 RESOLUTION - HP 750c | Service Manual - Page 187
table is only applicable to DesignJets 750C, 750C Plus and 755CM. 755 CM PRINT QUALITY PRINT DIRECTIONS CARRIAGE SPEED RESOLUTION NO. OF PASSES SWATH WIDTH Unidir/Bidir IPS N IN Normal Unidir 18.33 300 4 0.32 Best Unidir 18.33 300 6 0.32 750C Color plots on High - HP 750c | Service Manual - Page 188
plots on Coated Paper 750C 750C This table is only applicable to DesignJets 700, 750C and 750C Plus. Plus PRINT QUALITY PRINT DIRECTIONS CARRIAGE SPEED RESOLUTION NO. OF PASSES Unidir/Bidir IPS N Fast Bidir 36.66 300 1 Normal Bidir 18.33 300 1 Normal Bidir - HP 750c | Service Manual - Page 189
Gloss Photo 750C Plus This table is only applicable to DesignJets 750C, 750C Plus and 755CM. 755 CM PRINT QUALITY PRINT DIRECTIONS CARRIAGE SPEED RESOLUTION NO. OF PASSES SWATH WIDTH SWATHS/ ADVANCE Unidir/Bidir IPS N IN N Fast Unidir 36.66 300 4 0.32 4 Fast Bidir - HP 750c | Service Manual - Page 190
D Carriage speed D Dry time (between passes and before cutting) D True/comp. black Varware D Dry time (between passes and before cutting) Varware D Pen temperature Media type (nonĆPostScript HP Windows driver) Print Quality or Quality Printer settings D Media selected (HP drivers)) D The - HP 750c | Service Manual - Page 191
biĆdirectional mode, so you can distinguish the thetaĆZ error from the biĆdirectional one. The second objective is to check performance of the cartridge. The plot includes an area fill, and a number of parallel lines that show up directional problems. There is also a nozzle checkout with which you - HP 750c | Service Manual - Page 192
page 7Ć5 and perform the pen alignment test again. D Replace all cartridges. D Replace the carriage ' page 6Ć34. D Troubleshoot the EEROM and the Main PCA. Nozzle CheckĆOut Note that, to print the nozzle checkĆout, the central nozzles of the cartridges have been used. So the numbers of the nozzles - HP 750c | Service Manual - Page 193
of the frontĆpanel settings. The following are the parameters that define the print mode: D Unidirectional. D Color. D Resolution 300 dpi (addressable 600 dpi for HP DesignJet 750C Plus and 755CM model C3198B). D Swath advance = 0.32 inches (using 96 nozzles in the color pens and 192 in the black - HP 750c | Service Manual - Page 194
750C Plus 755 basic colors (cyan, magenta, qualitative information. yellow and black). This is a worst case situation, which provides CM test again. D Replace all cartridges. D Replace the carriage ' page 6Ć34. D Troubleshoot the EEROM and the Main PCA. 9-16 Print Quality C4705-90000 - HP 750c | Service Manual - Page 195
AreaĆFill Diagnostic Plot (Service Test 15 ' page 8Ć35) Objectives This plot is intended to check the printĆquality performance when printing area fills. The plot presents a worst case situation for the mainĆink media interaction problems: 1. 2. SMEAR TEXT SMEAR TEXT SMEAR TEXT SMEAR TEXT SMEAR - HP 750c | Service Manual - Page 196
list of print quality problems that you may find when printing in certain conditions. Cockle Description The surface of the media wrinkles in saturated area fills. Causes Ink media interaction during the drying process. The affected medias are: D Translucent Bond. D Natural tracing paper. D Japanese - HP 750c | Service Manual - Page 197
750C Bleeding 750C Plus 755 Description CM Color inks, printed side by side, mix together at the border. Also occurs at areaĆfill borders with a high color saturation. Causes The ink is not properly absorbed by the media and spreads from its original position. Media types affected are bonds. - HP 750c | Service Manual - Page 198
6Ć25. D Cartridge problems: Set the plotter to multiĆpass print mode. Replace the cartridges. Check the wipers and caps of the Service Station and if necessary, replace the service station ' page 6Ć42. D Drop volume too small: Troubleshoot the pen thermal management system, the TTOE, the carriage - HP 750c | Service Manual - Page 199
10 Product History and Service Notes 10-1 - HP 750c | Service Manual - Page 200
plotters and the latest version documented in this manual. SerialĆNumber Format The plotter serial number is composed of 10 letters and digits, for example ESA5900248. D In the first two positions is the code above, this is 5 for plotters made in 1995. D In plotter from others manufactured in the - HP 750c | Service Manual - Page 201
button. 3 Use the Arrow buttons to scroll to the Statistics" menu display and press the Enter button. 4 Use the Arrow buttons to scroll to the Code rev =" C4705-90000 Product History and Service Notes 10-3 - HP 750c | Service Manual - Page 202
found at the following address: http://plotterĆsupport.bpo.hp.com/ You can access this site from a PC or UNIX workstation to obtain the following information: D General Information. D Documentation (latest versions of the Service Manuals and User Guides). D Training. D Service Notes. D Newsletters - HP 750c | Service Manual - Page 203
) HP DesignJet 750C (C3196A) HP DesignJet 755CM (C3198A) Serial Numbers: C3195A ESA0000000/ESA6207614 C3196A ESA0000000/ESA6231908 C3198A ESA0000000/ESA6206073 To be performed by: Customer Parts Required: Part Number Description Qty C3195-60135 FWM. SIMM A.02.10 1 Situation This Service - HP 750c | Service Manual - Page 204
Quality Best are printed in 6 passes. D Provides a significant improvement in paper advance error compensation, which is optimized when we add a line on the mark encoder (Refer to Service Note ' page 10Ć18). D Possible media jam when powering on the unit (3% or less). This problem is only present - HP 750c | Service Manual - Page 205
of Media ). If you continue asking the printer status, the error event ( e.g. Cover Open ) is seen once every 10 times. D Fixed corner case problems in HPĆGL / HPĆGL2 instructions. Dashed lines printed with LTO are printed continuously. D PostScript: When printing in an area which is located between - HP 750c | Service Manual - Page 206
requested the improved paper advance error compensation algorithm (around 20%): D C3195A ESA5B05605/ESA6106789 D C3196A ESA5B22102/ESA6125903 D Firmware A.02.08 D C3198A ESA5A00000/ESA5B02306 D Some codes 10-8 Product History and Service Notes C4705-90000 - HP 750c | Service Manual - Page 207
in the Last Firmware Revision A.02.10 This problem will be solved in the following firmware releases. D None of the HP JetDirect EX cards work with the DesignJet 755CM in a MAC environment. Solution D Install firmware revision A.02.10 (pn C3195Ć60135). D Verify if the mark encoder has a black - HP 750c | Service Manual - Page 208
1 November 1995 Service Note: C3195AĆ01 C3196AĆ01 Supersedes: None Products: HP DesignJet 750C (C3195A) HP DesignJet 750C (C3196A) Serial Numbers: C3195A ESA0000000/ESA5700335 C3196A ESA0000000/ESA5700644 To be performed by: HPĆQualified Personnel Parts Required: Part Number Description - HP 750c | Service Manual - Page 209
the plotter. 8 Install the new platen following the above instructions in the reverse order. Administrative Information Classification: Modification Recommended Standards: 0.5 Hour Labor Action Category: On Failure Location Category: OnĆSite Service Inventory: N/A Used Parts: Scrap HP - HP 750c | Service Manual - Page 210
Problems that Cause Paper Advance Errors Date: 1 February 1996 Service Note: C3195AĆ02A C3196AĆ02A C3198AĆ01A Supersedes: C3195AĆ02 C3196AĆ02 C3198AĆ01 Products: HP DesignJet 750C (C3195A) HP DesignJet 750C (C3196A) HP DesignJet 755CM (C3198A) Serial Numbers: C3195A ESA0000000/ESA5B05350 - HP 750c | Service Manual - Page 211
window ' page 6Ć14. 2 Remove the right endĆcover ' page 6Ć17. 3 Use a pair of pliers to remove the small spring from the rollfeed module 4 Install the new spring. Solution to Problem 2: Rollcover screws / spindle interaction Replace ĆSite Service Inventory: N/A Used Parts: N/A HP Responsible - HP 750c | Service Manual - Page 212
Error Date: 15 December 1995 Service Note: C3195AĆ03 C3196AĆ03 Supersedes: None Products: HP DesignJet 750C (C3195A) HP DesignJet 750C (C3196A) Serial Numbers: C3195A ESA0000000/ESA5700250 C3196A ESA0000000/ESA5700400 To be performed by: HPĆQualified Personnel Parts Required: Part - HP 750c | Service Manual - Page 213
the rear bushing and preload spring from the carriage and carefully remove the carriage and main drive belt from the plotter. 9 Remove the drive belt from the carriage. 10 Install the new pen carriage following the above instructions in the reverse order. Administrative Information Classification - HP 750c | Service Manual - Page 214
Longer Screws Make Legs More Stable Date: 1 February 1996 Service Note: C3195AĆ04 C3196AĆ06 C3198AĆ04 Supersedes: None Products: HP DesignJet 750C (C3195A) HP DesignJet 750C (C3196A) HP DesignJet 750CM (C3198A) Serial Numbers: C3195A ESA0000000/ESA5C05877 C3196A ESA0000000/ESA5C23782 - HP 750c | Service Manual - Page 215
Administrative Information Classification: Modification Recommended Standards: 0.5 Hour Labor Action Category: On Failure Location Category: OnĆSite Service Inventory: N/A Used Parts: Scrap HP Responsible Until: 1 February 1998 Author Entity: EV/F900 C4705-90000 Product History and - HP 750c | Service Manual - Page 216
Service Note: C3195AĆ05 C3196AĆ07 C3198AĆ05 Supersedes: None Products: HP DesignJet 750C (C3195A) HP DesignJet 750C (C3196A) HP DesignJet its performance, modify the mark encoder so that the reference for the paper advance error compensation is more accurate. Solution A line or a notch is - HP 750c | Service Manual - Page 217
paper). 7 Trim a piece of the sheet containing one black line. 8 Place the line in the center of the mark encoder, positioning it parallel to the platen roller. 9 Using a pen, softly rub on the back of the line. 10 Category: OnĆSite Service Inventory: N/A Used Parts: N/A HP Responsible Until: 1 - HP 750c | Service Manual - Page 218
To be performed by: HPĆQualified Personnel Parts Required: Part Number Description Qty C3195Ć60140 Pen Carriage 1 Situation In some cases, when inserting the Cyan and Magenta cartridges, the plotter will try to align the cartridges but fails. The message Alignment Error" is displayed on the - HP 750c | Service Manual - Page 219
the rear bushing and preload spring from the carriage and carefully remove the carriage and main drive belt from the plotter. 9 Remove the drive belt from the carriage. 10 Install the new pen carriage following the above instructions in the reverse order. Administrative Information Classification - HP 750c | Service Manual - Page 220
the air coming from the fan so that it does not affect the print quality. The procedure to install the fan deflector is as follows: 1 Open the window. 2 Identify the YĆyoke, on the chassis, between the slider rods and behind the carriage belt. 10-22 Product History and Service Notes C4705-90000 - HP 750c | Service Manual - Page 221
deflector is to be installed. These cuts are on the left side of the plotter. 4 Passing the fan deflector between the slider rods and the encoder strip, encoder strip inside the plotter. 5 Install the third clip as shown in figure 3. Figure 3 C4705-90000 Product History and Service Notes 10-23 - HP 750c | Service Manual - Page 222
of the plotter Figure 5 Administrative Information Classification: Modification Recommended Standards: 0.1 Hour Labor Action Category: On Failure Location Category: OnĆSite Service Inventory: N/A Used Parts: N/A HP Responsible Until: 1 Feb 1998 Author Entity: EV/F900 10-24 Product - HP 750c | Service Manual - Page 223
11 Parts and Diagrams 11-1 - HP 750c | Service Manual - Page 224
on Drawing HP Part Number Legs Quantity Description 1 C3192Ć60002 2 Legs Assembly 2 C3192Ć60003 2 Foot Assebmly 3 C4696Ć60002 1 Hardware Kit 4 C3192Ć60001 1 X Brace Assembly (D/A1Ćsize) C3193Ć60001 1 X Brace Assembly (E/A0Ćsize) 5 C3195Ć60052 1 Paper Diverter Assembly - HP 750c | Service Manual - Page 225
C4705-90000 Legs Parts and Diagrams 11-3 - HP 750c | Service Manual - Page 226
Reference on Drawing Window and Back Cover Assemblies HP Part Number Quantity Description 1 C4705Ć60087 1 Window Assembly (D/A1Ćsize) C4706Ć60087 1 Window Assembly (E/A0Ćsize) 2 C3195Ć40060 1 Center Cover Latch 3 0624Ć0771 1 Screw 4 C3195Ć60039 1 Center Cover Assembly (D/A1Ć - HP 750c | Service Manual - Page 227
C4705-90000 Window and Back Cover Assemblies Parts and Diagrams 11-5 - HP 750c | Service Manual - Page 228
Reference on Drawing HP Part Number Electronics Enclosure Quantity Description 1 C4705Ć60092 1 Electronics Enclosure 1 Switch Mount 8 C3195Ć40047 1 Switch Mount Cap 9 0515Ć2282 Ć Grounding Screw 10 C3195Ć60056 1 Power Cable (D/A1Ćsize) C3196Ć60056 1 Power Cable (E/A0Ćsize) - HP 750c | Service Manual - Page 229
C4705-90000 Electronics Enclosure Parts and Diagrams 11-7 - HP 750c | Service Manual - Page 230
Ć C4705Ć60111 1 Code SIMM (HP DesignJet 700) Ć C3195Ć60151 1 Code SIMM (HP DesignJet 750C) Ć C4708Ć60111 1 Code SIMM (HP DesignJet 750C Plus/755CM) Ć C3198Ć60151 1 Postscript SIMM Ć 5961Ć3524 1 Serial Number 28 C3195Ć80009 1 Trailing Cable 11-8 Parts and Diagrams C4705-90000 - HP 750c | Service Manual - Page 231
C4705-90000 Electronics Enclosure Parts and Diagrams 11-9 - HP 750c | Service Manual - Page 232
Reference on Drawing HP Part Number CarriageĆAxis Quantity Description 1 C3195Ć40017 1 Right Bracket 2 0515Ć0382 1 Screw 3 Pulley Assembly 8 C3195Ć40039 1 Wedge Tensioner 9 C3195Ć80002 1 Spring 10 C3195Ć80009 1 Trailing Cable 11 C3195Ć40024 1 Trailing Cable Clip 12 - HP 750c | Service Manual - Page 233
C4705-90000 CarriageĆAxis Parts and Diagrams 11-11 - HP 750c | Service Manual - Page 234
1 Carriage Belt (E/A0Ćsize) 21 C4705Ć60054 1 Carriage Assembly (HP DesignJet 700) C3195Ć60143 1 Carriage Assembly (HP DesignJet 750C/750C Plus/755CM) Ć C3195Ć40066 1 Fan Deflector (Only applicable to the EĆsize Printers) For Information regarding this part, refer to Service Note - HP 750c | Service Manual - Page 235
C4705-90000 CarriageĆAxis Parts and Diagrams 11-13 - HP 750c | Service Manual - Page 236
1 Screw 4 C4705Ć00020 1 Nameplate (HP DesignJet 700) C3195Ć00019 1 Nameplate (HP DesignJet 750C) C4708Ć00020 1 Nameplate (HP DesignJet 750C . ) C3198Ć00020 1 Nameplate (HP DesignJet 755CM) 5 C3195Ć40029 1 Left Trim 6 0624Ć0771 1 Screw 11-14 Parts and Diagrams C4705-90000 - HP 750c | Service Manual - Page 237
C4705-90000 Left EndĆCover and Trim Parts and Diagrams 11-15 - HP 750c | Service Manual - Page 238
Trim HP Part Number Quantity Description 1 C3195Ć40006 1 Right EndĆCover 2 0515Ć2337 1 Screw 3 0515Ć2250 1 Screw 4 C3195Ć40030 1 Right Trim 5 See Page 11Ć35 1 FrontĆPanel Overlay 6 C4705Ć60085 1 QRG Holder 7 C3195Ć60038 1 FrontĆPanel Assembly 8 C3195Ć60015 1 Window - HP 750c | Service Manual - Page 239
C4705-90000 Right EndĆCover and Trim Parts and Diagrams 11-17 - HP 750c | Service Manual - Page 240
Reference on Drawing HP Part Number RollĆFeed Components Quantity Description 1 C1633Ć00084 1 Label 2 7 C4704Ć60082 1 Left RollĆFeed Module 8 0380Ć3073 1 Spacer 9 0515Ć2248 1 Screw 10 C2847Ć20017 1 Screw 11 Ć 1 RollĆFeed Cover Spring (D/A1Ćsize) (Included in Item 2) - HP 750c | Service Manual - Page 241
C4705-90000 RollĆFeed Components Parts and Diagrams 11-19 - HP 750c | Service Manual - Page 242
Reference on Drawing Service Station and Primer Assembly HP Part Number Quantity Description 1 C3195Ć60165 1 Service Station Assembly 2 0515Ć2282 1 1 Screw 8 0515Ć1743 1 Screw 9 C3195Ć60009 1 Bail Stepper Assembly 10 0515Ć2299 1 Screw 11-20 Parts and Diagrams C4705-90000 - HP 750c | Service Manual - Page 243
C4705-90000 Service Station and Primer Assembly Parts and Diagrams 11-21 - HP 750c | Service Manual - Page 244
Reference on Drawing HP Part Number Carriage Assembly Quantity Description 1 C4705Ć60054 1 Carriage Assembly (HP DesignJet 700) C3195Ć60143 1 Carriage Assembly (HP DesignJet 750C/750C Plus/755CM) 2 Deleted 3 C3195Ć40027 1 Clamp 4 C3195Ć40026 1 Clamp 5 C3195Ć40064 1 Rear - HP 750c | Service Manual - Page 245
C4705-90000 Carriage Assembly Parts and Diagrams 11-23 - HP 750c | Service Manual - Page 246
Reference on Drawing HP Part Number Media Entry Path Quantity Description 1 Ć 1 Mark Encoder (Included in Item 2) 2 C4699Ć60042 1 Drive Roller (D/A1Ćsize) C4700Ć60042 1 Drive Roller (E/A0Ćsize) 3 Ć 1 MediaĆMotor Mount (Included in Item 8) 4 C3195Ć60102 1 Encoder Cable 5 0515Ć - HP 750c | Service Manual - Page 247
C4705-90000 Media Entry Path Parts and Diagrams 11-25 - HP 750c | Service Manual - Page 248
Reference on Drawing Media Entry Path (Continued) HP Part Number Quantity Description 14 Ć 1 Media Sensor (Included in Item 10) 15 C3195Ć60173 1 Entry Platen Assembly (D/A1Ćsize) C3196Ć60173 1 Entry Platen Assembly (E/A0Ćsize) 16 0515Ć1743 1 Screw 17 0515Ć2337 1 Screw 18 - HP 750c | Service Manual - Page 249
C4705-90000 Media Entry Path Parts and Diagrams 11-27 - HP 750c | Service Manual - Page 250
Reference on Drawing HP Part Number Bail and Overdrive Quantity Description 1 C3195Ć60009 1 Bail Stepper Assembly Screw 7 3050Ć1381 1 Washer 8 C1633Ć60030 1 Overdrive Gear Assembly 9 Deleted 10 C2847Ć20017 1 Screw 11 C1633Ć40019 1 Cluster Gear 12 C3195Ć60148 1 Overdrive - HP 750c | Service Manual - Page 251
C4705-90000 Bail and Overdrive Parts and Diagrams 11-29 - HP 750c | Service Manual - Page 252
Reference on Drawing HP Part Number PinchĆ Ć 2 Cam Journal (Included in Item 22) 9 Ć 2 Nut (Included in Item 22) 10 Ć 2 Screw (Included in Item 22) 11 Ć 1 Rear Wire Linkage (Included in Item 21 Ć 1 Cam Drive (Included in Item 22) 22 C3195Ć60116 1 PinchĆArm Lift Assembly 11-30 - HP 750c | Service Manual - Page 253
C4705-90000 PinchĆArm Assembly Parts and Diagrams 11-31 - HP 750c | Service Manual - Page 254
Reference on Drawing HP Part Number Stardguard Assembly Quantity Description 1 C3195Ć40045 4 Media Guide 2 C3195Ć60029 1 Cutter Enclosure Assembly (D/A1Ćsize) C3196Ć60029 (E/A0Ćsize) 6 0515Ć2248 1 Screw 7 C2858Ć60021 1 Cutter Assembly 11-32 Parts and Diagrams C4705-90000 - HP 750c | Service Manual - Page 255
C4705-90000 Stardguard Assembly Parts and Diagrams 11-33 - HP 750c | Service Manual - Page 256
Documentation Chinese English French German Italian Japanese Korean Portuguese Spanish Taiwanese Accessories HP Part Number DesignJet 700/750C/750C Plus/755CM D/A1 Size: C3195-60113 E/A0 Size: C3196-60113 DesignJet 700/ 750C Plus C4705-60030 C4705-60021 C4705-60025 C4705-60024 C4705-60027 C4705 - HP 750c | Service Manual - Page 257
Guide HP-GL/2 and HP RTL Peripherals Product Comparison Guide Supplies Source (booklet) Media Reference Guide DesignJet 700/ 750C/750C Plus/ C4705-90006 DesignJet 755CM C3195-90121 DesignJet 700/750C/750C Plus/755CM 5959-9733 5959-9734 5963-5162E 5963-5220 / 5963-5224 C4705-90000 Parts - HP 750c | Service Manual - Page 258
Description Print Cartridges Black Cyan Magenta Yellow Plug-In Memory (DRAM SIMM) 4-Mbyte SIMM 8-Mbyte SIMM 16-Mbyte SIMM 32-Mbyte SIMM PostScript Upgrade Kit (ROM SIMM and driver) HP Color Management Kit HP Part Number DesignJet 700 51645A - - - DesignJet 750C/ 750C Plus/755CM 51645A 51644C - HP 750c | Service Manual - Page 259
HP Part Number DesignJet HP Apollo workstation using an SPE (Serial/Parallel Expansion) option and supplied adapter cable. DEC VAX. Sun workstation. IBM PC, PC/XT, IBM PS/2 and compatible computers Apple Macintosh Plus, SE, II Series, Classic, LC family, Quadra family, PowerBook, PowerMac DesignJet - HP 750c | Service Manual - Page 260
Notes 11-38 Parts and Diagrams C4705-90000 - HP 750c | Service Manual - Page 261
12 Support S.rvic.s 12Ć1 - HP 750c | Service Manual - Page 262
of Hewlett-Packard support resources for customers in the United States. Use these resources before calling the Customer Support Center, whose details are given after this list. Resource HP FIRST Fax HP Download Service (BBS: Bulletin Board Service) CompuServe (HP FORUM) Internet Drivers by mail - HP 750c | Service Manual - Page 263
) 538-8787 6am - 5pm (PST) Parts Identification Assistance in identifying service parts. (916) 783-0804 M Tu W Th: 6am - 3pm (MST) Friday: 6am - 2pm (MST) Support Materials Organization Ordering of manuals and service parts directly from HP. Must have a part number before calling. (800) 227 - HP 750c | Service Manual - Page 264
Board Service) Support provided and notes Detailed product support information on common software applications and troubleshooting tips. All sent by fax. Must call using a Group 3 fax machine. Electronic downloading of HP product information, troubleshooting hints and updated HP plotter driver - HP 750c | Service Manual - Page 265
.com Name: anonymous Password: your e-mail address World-Wide Web: http://www-dmo.external. hp.com/peripherals/main. html A quarterly CD-ROM subscription service from HP. This online system provides technical information, product information and software drivers. UK: (0800) 960274 Outside the UK - HP 750c | Service Manual - Page 266
30 days of purchase After 30 days of purchase European Service Agreements Product Details HP Support-Pack HP SupportPack is a three-year on-site service agreement which you can buy within 30 days of purchasing your plotter. With HP SupportPack, you can protect your investment and ensure its - HP 750c | Service Manual - Page 267
Republic Greece Hungary Poland Turkey Headquarters International Sales Branch (I.S.B.) / Middle East & Africa Denmark 32) 2 778 30 43 (+358) 0 887 2477 (+47) 22 75 56 10 (+351) 1 301 63 32 or (+351) 1 301 63 33 (+46) 8 444 25 20 (+41) 31 980 33 90 (+41) 22 780 85 42 C4705Ć90000 Support Services - HP 750c | Service Manual - Page 268
Hewlett-Packard support services in Asia-Pacific Resource HP FIRST Fax HP Download Service (BBS: Bulletin Board Service)) Internet HP Support Assistant (CD-ROM) Asia-Pacific Support Resources Support provided and notes Phone/fax/ftp number Detailed product support information on common software - HP 750c | Service Manual - Page 269
Resource HP Fulfilment Service Asia-Pacific Support Resources (continued) Support provided and notes Latest drivers. Phone/fax/ftp number Australia: Tel: (612) 565 6099 Fax: (612) 519 5631 Hours of operation Japan Tel: (03) 5346 1891 Korea Tel: (82-2) 3452 - HP 750c | Service Manual - Page 270
Notes 12Ć10 Support Services C4705Ć90000 - HP 750c | Service Manual - Page 271
Glossary Glossary-1 - HP 750c | Service Manual - Page 272
to minimize data errors when data are transferred. ... (Part of a definition from The Harper Collins Dictionary of Computer Terms, D Ian R. Sinclair 1991.) cm Centimeter(s). Customer Engineers HP field support engineers. D/A1-size plotters Models C3190A and C4694A. data display Service monitor. dB - HP 750c | Service Manual - Page 273
colors or different shades of gray. helical gear Right-hand drive-roller gear. HP Hewlett-Packard. HP-GL Precursor of HP-GL/2. HP-GL/2 Hewlett-Packard's standard graphics language for its plotters. HP-RTL Hewlett-Packard Raster Transfer Language. Hz Hertz. IC Integrated Circuit. IEEE Institute - HP 750c | Service Manual - Page 274
whereby ink is pumped to the cartridges from a reservoir that does not move with the carriage. PAL Programmable Array Logic. palette A set of pens for which width and % shading are defined using the setup sheet or the graphics software. paper axis Media axis (X-axis). parity An error-checking method - HP 750c | Service Manual - Page 275
Product Line 30 Hewlett-Packard's product line of large-format, pen and thermal-inkjet plotters. PWM Pulse-Width Modulation. RAM Random-Access Memory. raster 1. A matrix of dots, or pixels, where each pixel is defined by a bit. A bit that is "on" will print a dot on the paper. A bit that is "off - HP 750c | Service Manual - Page 276
on whether the plot is color or monochrome.) TCP/IP Transmission Control Protocol / Internet Protocol. theta-Z error A print-quality error caused when the nozzles on a cartridge are not perpendicular to the carriage axis. The error shows up as jagged vertical lines. translucent Describes a type - HP 750c | Service Manual - Page 277
Index Index-1 - HP 750c | Service Manual - Page 278
GlossaryĆ2 acoustics, 2Ć3 action keys, 3Ć10, 3Ć11 addressable dpi, GlossaryĆ2 adjustments, 7Ć2 align cartridges, 8Ć55 ammonia, causing belt damage, 8Ć55 Apple LocalTalk, 1Ć3 application notes, part number, 11Ć35 applications of plotter, 1Ć2 area fill PQ plot, service test, 8Ć35 ASIC, GlossaryĆ2 ASIC - HP 750c | Service Manual - Page 279
, GlossaryĆ2 centronics interface cables, 11Ć37 Channel, Serial, 5Ć5 character sets, 1Ć2 cleaning carriage bushing, 8Ć55 drive roller, 4Ć3 plotter, 4Ć2 Coalescence, 9Ć18 cockle, 9Ć18 code, firmware revision, 10Ć3 color PQ plot, service test, 8Ć34 Configuration Plot, Description, 8Ć56 configuring the - HP 750c | Service Manual - Page 280
removing, 6Ć12 fan problems, service note, 10Ć22 Feathering, 9Ć19 film, polyester, 8Ć55 Fire pulse, waveform, 5Ć5 firmware history, 10Ć5 firmware revision code, 10Ć3 Initialization Flow Chart, 8Ć3 frequency, 2Ć2 friction, 9Ć14 front panel action keys, 3Ć10, 3Ć11 overlay, part numbers, 11Ć35 plotting - HP 750c | Service Manual - Page 281
assembly instructions, 3Ć6 length, plotter, 2Ć3 lights, front panel, 3Ć10, 3Ć11 line sensor, 5Ć5, GlossaryĆ4 calibration, 7Ć5 description, 5Ć9 Linear Encoder, 5Ć4 liquids, 6Ć3 M main drive belt, removing, 6Ć34 main PCA description, 5Ć8 removing, 6Ć9 service test, 8Ć25 mainĆcarriage com, service test - HP 750c | Service Manual - Page 282
, service test, 8Ć24 moisture, on plotter, 4Ć2 mono PQ plot, service test, 8Ć33 Motor Driver, XĆaxis, 5Ć4 N network connections, 1Ć3 noise, carriage bushing, 4Ć2 noisey carriage, 8Ć55 Novell Netware, 1Ć3 nozzle print test, service test, 8Ć32 nozzles, 9Ć14 number format, serial, 10Ć2 O offĆaxis ink - HP 750c | Service Manual - Page 283
primer removing, 6Ć41 service test, 8Ć42 print modes, 9Ć5 print quality, 1Ć4, 9Ć1 problems, 9Ć18 troubleshooting checklist, 9Ć2 vertical line straightness, 9Ć14 printed circuit assembly, identifying a, 10Ć3 printĆmode, characteristics, 9Ć5 problems, print quality, 9Ć18 Processor Carriage, 5Ć9 Main - HP 750c | Service Manual - Page 284
, 6Ć52 service station, 6Ć42 spittoon, 6Ć44 starguard, 6Ć40 trailing cable, 6Ć36, 6Ć39 window, 6Ć13 window sensor, 6Ć20 YĆtensioner and housing, 6Ć31, 6Ć32 Y-axis motor, 6Ć32 repackaging kit, 11Ć34 repacking the plotter, 3Ć5 resolution, 1Ć4, GlossaryĆ5 revision code of firmware, 10Ć3 right endcover - HP 750c | Service Manual - Page 285
environment, 2Ć3 supplies source, part number, 11Ć35 support services, 12Ć1 AsiaĆPacific, 12Ć8 Europe, 12Ć4 USA, 12Ć2 swelling of belt, 4Ć2 switchĆon Ć normal behavior, list of characteristics, 8Ć2 symbols, safety, x system error codes, 8Ć9 C4705-90000 T tape on cartridges, 8Ć55 TCP/ICP host - HP 750c | Service Manual - Page 286
W warning symbols, x water, warning, 6Ć3 weight, plotter, 2Ć3 window, removing, 6Ć13 window sensor, 5Ć6 removing, 6Ć20 service test, 8Ć51 wipers blades, worn, 8Ć55 worded error messages, . world wide web, information, 10Ć4 X X motion control, service test, 8Ć43 XĆaxis, GlossaryĆ6 XĆaxis calibration - HP 750c | Service Manual - Page 287
HP DesignJet 750C and 755CM and introduces the HP DesignJet 700 and 750C Plus. 1st edition, titled HP C3195A/C3196A/C3198A HP DesignJet 750C/755CM Service Manual, August 1995 2nd edition, titled HP C4705A/C4706A/C3195A/C3196A/ C4708A/C4709A/C3198A/C3198B HP DesignJet 700/750C/750C Plus/755CM Service - HP 750c | Service Manual - Page 288
HP DesignJet 755CM printers (models C3198A and C3198B) For information about using these plotters, refer to the corresponding user and quick-reference guides. The procedures described in this manual are to be performed by HP-qualified service personnel only. Recycled paper Printed in U.S.A. 8/96 HP
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Service Manual
HP DesignJet 700,
HP DesignJet 750C,
HP DesignJet 750C Plus and
HP DesignJet 755CM
Plotters/Printers