Brother International HL-3400CN Service Manual
Brother International HL-3400CN - Color Laser Printer Manual
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- Brother International HL-3400CN | Service Manual - Page 1
Brother Color Laser Printer SERVICE MANUAL MODEL: HL-3400CN Read this manual thoroughly before commencing any maintenance work. Keep this manual in a convenient place for quick and easy reference at all times. March, 2000 SM-PRN005 - Brother International HL-3400CN | Service Manual - Page 2
referred to as "this machine" or "the printer"). This information is vital to the service technician to maintain the high printing quality and performance of the printer. This service manual covers the HL-3400CN color laser printer. This manual consists of the following chapters: CHAPTER 1: OUTLINE - Brother International HL-3400CN | Service Manual - Page 3
REGULATIONS SAFETY INSTRUCTIONS SHIPMENT OF THE PRINTER CHAPTER 1 and Mechanical 2.4 Paper 2.5 Printing Printer Set-up Location 2. UNPACKING 2.1 Unpacking of Printer 2.2 Unpack the Starter Kit 3. INSTALLATION WORK 3.1 Install the OPC Belt Cartridge 3.2 Install the Toner Cartridge into the Printer - Brother International HL-3400CN | Service Manual - Page 4
HL-3400CN SERVICE MANUAL 4. OPTIONS 4.1 Lower Tray Unit 4.2 Duplex Unit 4.3 Font Card / Flash Memory Card / HDD Card 4.4 Network Option 4.5 RAM PANEL LAYOUT 2. VIDEO CONTROLLER MODE 2.1 Configuration of Operational Mode 2.2 Toner Save Mode / Power Save Mode 2.3 Line Test Mode 2.4 DRAM Test - Brother International HL-3400CN | Service Manual - Page 5
Guide 2.3 Cleaning the Paper Exit Roller 2.4 Cleaning the Transfer Roller 2.5 Cleaning the Paper Discharger 2.6 Cleaning the OPC Belt Cartridge 2.7 Cleaning the Transfer Drum 2.8 Cleaning the Dustproof Glass in the Laser Unit 2.9 Cleaning the Printer Interior 2.10 Cleaning the Oil Pad 3. PERIODIC - Brother International HL-3400CN | Service Manual - Page 6
Mode 3. PAPER TRANSPORT ERROR 3.1 Feed Jam 3.2 Inner Jam 3.3 Outer Jam 3.4 Others 4. SERVICE CALL 4.1 Video Controller Mode 4.2 Engine Controller Mode 5. IMAGE FAILURE APPENDIX 1 APPENDIX 2 APPENDIX 3 APPENDIX 4 APPENDIX 5 APPENDIX 6 APPENDIX 7 APPENDIX 8 HL-3400CN SERVICE MANUAL PR2000071 7-40 - Brother International HL-3400CN | Service Manual - Page 7
Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that the printer printer is completely confined within protective housings and external covers, the laser beam cannot escape from the machine during any phase of user manual - Brother International HL-3400CN | Service Manual - Page 8
HL-3400CN SERVICE MANUAL IEC 825 SPECIFICATION (FOR 220-240 V MODEL ONLY) This printer is a Class 1 laser product as defined in IEC 825 specifications. The label shown below is attached in countries where required. CLASS 1 LASER PRODUCT APPAREL A LASER DE CLAIM 1 LASER 10.ASSE 1 PRODUKT This printer - Brother International HL-3400CN | Service Manual - Page 9
SHIPMENT OF THE PRINTER SAFETY INSTRUCTIONS SAFETY PRINCIPLE 1) Before starting any operations, read this manual thoroughly. Especially read the safety instructions in this section carefully and ensure that you understand the contents. 2) Perform all the operations by following the procedures - Brother International HL-3400CN | Service Manual - Page 10
HL-3400CN SERVICE MANUAL SHIPMENT OF THE PRINTER If for any reason you must ship the printer, carefully package the printer to avoid any damage during transit. It is recommended that you save and use the original packaging. The printer should also be adequately insured with the carrier. A CAUTION • - Brother International HL-3400CN | Service Manual - Page 11
CHAPTER 1PRODUCT OUTLINE CONTENTS CHAPTER 1 PRODUCT OUTLINE 1-3 1. FEATURES 1-3 2. PARTS NAMES & FUNCTIONS 1 -6 3. INTERNAL STRUCTURE 1-8 4. DESCRIPTION OF CONTROL PANEL 1-9 4.1 Video Controller Mode 1-9 4.2 Engine Controller Mode 1-9 1-2 - Brother International HL-3400CN | Service Manual - Page 12
HL-3400CN SERVICE MANUAL CHAPTER 1 PRODUCT OUTLINE 1. FEATURES This printer has the following features: 2400 x 600 dpi Class Resolution The printer prints pages with a resolution of 600 dots per inch (dpi) as default. It also accepts lower resolution data in the 300 dpi mode, or higher - Brother International HL-3400CN | Service Manual - Page 13
programs that support one of these printers. Automatic Emulation Selection The printer can automatically select the printer emulation mode depending on the print commands it receives from the computer software. With this feature, many users can share the printer on a network. Data Compression - Brother International HL-3400CN | Service Manual - Page 14
HL-3400CN SERVICE MANUAL Toner Save Mode The printer has an economical toner save mode. This mode allows you to reduce the printer running cost substantially in addition to the improved life expectancy of the toner cartridge. Reprint Function A touch of a panel button allows reprinting of the last - Brother International HL-3400CN | Service Manual - Page 15
CHAPTER 1PRODUCT OUTLINE 2. PARTS NAMES & FUNCTIONS 2. Control panel 1. Upper cover 4. Top cover (Paper Exit Unit) 5. Power button Media cassette Fig. 1-1 Paper exit unit 3. Front cover I 8. Controller box gss~N Fig. 1-2 6. Power inlet 7. Rear access cover 1-6 - Brother International HL-3400CN | Service Manual - Page 16
HL-3400CN SERVICE MANUAL No. Part Name 1 Upper cover Outline of Functions To act as an upper enclosure and also as a paper tray for printed paper. 2 Control panel To display the status of printer operations and control the printer directly. 3 Front cover 4 Top cover (Paper exit unit) 5 Power - Brother International HL-3400CN | Service Manual - Page 17
images from the OPC belt on the drum. Emits a corona charge for separating the paper from the transfer drum. Transfers the toner image on the transfer drum to the paper. Feeds paper automatically. Feeds paper automatically from the media cassette. Generates a modulated laser beam and scans the OPC - Brother International HL-3400CN | Service Manual - Page 18
HL-3400CN SERVICE MANUAL 4. DESCRIPTION OF CONTROL PANEL The printer control panel provides control of the printer including test printing, maintenance operations performed by the video on the actual control panel labels or in the user's guide. Refer to CHAPTER 5 for detailed information. 1-9 - Brother International HL-3400CN | Service Manual - Page 19
CHAPTER 1PRODUCT OUTLINE Copy Pages Orientation Feeder gm Emulation Mode K CM Y Ready On Line Data 4 5 0 0Sel Form Feed 0 6 Alarm Feeder 9 8 Mode Font • 0 0 0 10 i Emulation Economy Test i 12 11 Continue 0 Set 0 V 0 13 Copy Reset i Fig. 1-4 No. LED / Button Name 1 - Brother International HL-3400CN | Service Manual - Page 20
CHAPTER 2 SPECIFICATIONS CONTENTS CHAPTER 2 SPECIFICATIONS 1. RATING 2. GENERAL SPECIFICATIONS 2.1 Printing 2.2 Functions 2.3 Electrical and Mechanical 2.4 Paper 2.4.1 Printable media 2.4.2 Media cassette capacity 2.4.3 Printed output 2.5 Printing Area 2.5.1 Effective printable area 2.5.2 Print - Brother International HL-3400CN | Service Manual - Page 21
HL-3400CN SERVICE MANUAL CHAPTER 2 SPECIFICATIONS 1. RATING WARNING Use the power supply cable supplied with the printer, or a similar cable complying with the following specification (3-wire refer to the parts reference list. ** For rating labels, refer to 'Safety Instruction' on Page viii. 2-3 - Brother International HL-3400CN | Service Manual - Page 22
to 2400dpi class by using Brother exclusive HRC (High Resolution Toner in a single-color single-component cartridge Life Expectancy: 14,000 single-sided pages/cartridge (Black) 8,500 single-sided pages/cartridge (C/M/Y) (when printing on A4/Letter-size paper with 5% coverage) Resident printer - Brother International HL-3400CN | Service Manual - Page 23
HL-3400CN SERVICE MANUAL 2.3. Electrical and Belt cartridge, Toner cartridge (Y, M, C, K), Fuser oil bottle, Fuser cleaning roller, Waste toner Pack Optional Units: . Lower Tray Unit: Approx and should be used internally at Brother offices only. • The power consumption figure quoted for sleep mode is - Brother International HL-3400CN | Service Manual - Page 24
CHAPTER 2 SPEC/FICATiONS PR2000046 2.4. Paper The standard media cassette (upper cassette) is supplied with the printer. The optional lower tray unit and the optional A4/Letter cassette can also be installed. NOTE: The standard upper cassettes and the optional A4/Letter cassette are - Brother International HL-3400CN | Service Manual - Page 25
HL-3400CN SERVICE MANUAL (2) Recommended paper specifications Item Description Basis Weight (g/m2) 82 ± 5 Thickness (µ m) 95 ± 6 Smoothness (Bekk) (seconds) 90 ± 20 Stiffness (Clark) 100 ± 15 Brightness (%) 85 ± 2 Surface Resistance (SI) 101° - 10" - Brother International HL-3400CN | Service Manual - Page 26
the optional lower cassette • Envelopes : 15 sheets • Transparency: 50 sheets • Label: 80 sheets 2.4.3 Printed output (1) Capacity 250 sheets of 75g/m2 (201b) paper (plain paper stacked in the output tray) (2) Delivery Face-down print delivery Note: Face down: Delivers the printed side of the - Brother International HL-3400CN | Service Manual - Page 27
HL-3400CN SERVICE MANUAL Table 2-1: Effective paper sizes indicated here should conform to the nominal dimensions specified by JIS. • A4 paper must accommodate 80 characters printed in pica pitch (203.2 mm). • The dot size is based on 300 dpi resolution. • Organizer is not supported by any printer - Brother International HL-3400CN | Service Manual - Page 28
CHAPTER 2 SPEC/FICAT1ONS 2.5.2 Print guarantee area Print guarantee area I 4mm Paper:5mm Other:10mm Non printable area Non guarantee area 3mm - 5mm - 4mm V Paper:4mm Other:10mm 4 3mm 4 5mm Fig. 2-2 Non guarantee area Non printable area -t 42mm 3mm 16mm 4mm - Brother International HL-3400CN | Service Manual - Page 29
HL-3400CN SERI/10E MANUAL 3. ENVIRONMENTAL CONDITIONS 3.1 Ambient Temperature / Humidity / Altitude (1) Under Operational conditions: 10.0 - 32.5°C (50 - 90.5°F), 20 - 80%RH (See the figure below) 80 e±ce". 70 >, 60 50 i - Brother International HL-3400CN | Service Manual - Page 30
(3) Storage and transportation environment of printer The following defines the storage and transportation environment of printers that have been packed according to Brother specification. However, this section does not cover the OPC belt cartridge, toner cartridges and developer cartridges. In - Brother International HL-3400CN | Service Manual - Page 31
Install the OPC Belt Cartridge 3.2 Install the Toner Cartridge into the Printer 3.3 Install the Oil Bottle and Fuser Cleaner Video Controller Mode only) 4. OPTIONS 4.1 Lower Tray Unit 4.2 Duplex Unit 4.3 Font Card / Flash Memory Card / HDD Card 4.4 Network Option 4.5 RAM Expansion 4.6 HDD (Hard Disk - Brother International HL-3400CN | Service Manual - Page 32
HL-3400CN SERVICE MANUAL CHAPTER 3 INSTALLATION 1. CONDITIORNESQUIREFODRINSTALLATION Any Laser beam printer is likely to be influenced by the environment of the set-up location. If the printer is set-up in an inappropriate location, the printer may not perform as expected. Therefore, the following - Brother International HL-3400CN | Service Manual - Page 33
I U"9.024.e *OS 9 • 00 -w0 eii c 0 u_ -P. 10cm (4") A 70cm (28") ►, 70cm (28") Fig. 3-1 • A space in front of the printer of 70cm is necessary to open the front cover. • A space at back of the printer of 20cm is necessary to open / close the rear access cover. • The space on both sides of the - Brother International HL-3400CN | Service Manual - Page 34
HL-3400CN SERVICE MANUAL 2. UNPACKING A. WARNING • The package containing a printer weighs approximately 66kg (145Ibs), so it is too heavy for one person to carry. it needs two adults or more to move the printer. Since the printer is a precision machine, make sure that it is carried slowly with care - Brother International HL-3400CN | Service Manual - Page 35
KIT (ST PACKING SET 3 (B)) L-SHAPED PAPER SUPPORT L-SHAPED PAPER SUPPORT BASE SET 3 (B) SILICA GEL STARTER PACKING SLEEVE OUTER BOX Media cassette OPC belt cartridge Oil bottle Fuser cleaner STARTER KIT PACKING (U) Toner cartridges STARTER KIT PACKING (M) Toner cartridges STARTER KIT PACKING - Brother International HL-3400CN | Service Manual - Page 36
HL-3400CN SERVICE MANUAL 2.2 Unpack the Starter Kit 1) Open the vinyl bag and slide off the cardboard sleeve covering the starter kit. 2) Confirm all of the following parts are inside the starter kit packing box. No. Kit Name Appearance Quantity 1 Toner the printer, remove - Brother International HL-3400CN | Service Manual - Page 37
in injuries. Install the parts of the starter kit into the printer according to the following procedures: 3.1 Install the OPC Belt Cartridge so will cause the OPC belt to be damaged due to contact with the toner cartridges. Front cover (2) Release the belt cartridge lock levers (left & right). - Brother International HL-3400CN | Service Manual - Page 38
HL-3400CN SERVICE MANUAL (3) Pull and remove the tension release pins on both sides (left & right) of the OPC belt cartridge. Tension release pin (4) Remove the protective sheet from the OPC belt cartridge. OPC belt cartridge (5) Install the OPC belt cartridge into the guides at both sides in - Brother International HL-3400CN | Service Manual - Page 39
3iNSTALLATION (3) Remove the protective cover from the toner cartridge. (4) Install the four toner cartridges by sliding them gently along the guides into the printer. DO NOT USE FORCE TO INSERT THE CARTRIDGES AND DO NOT PUSH THEM FULLY INTO THE PRINTER, THEY WILL BE POSITIONED CORRECTLY WHEN THE - Brother International HL-3400CN | Service Manual - Page 40
HL-3400CN SERVICE MANUAL (3) Install the oil bottle into the fusing unit. Oil bottle NOTE: ›- - 1 When installing the oil bottle, be sure not to c,. touch the oil feed connection - Brother International HL-3400CN | Service Manual - Page 41
on the label. Excessive loading of media over the upper limit will result in paper feedjams or print quality problems. (4) Install the cassette cover. (5) Install the cassette into the printer. Fig. 3-16 Paper guide 40 • s 141 - Paper guide Fig. 3-17 PAPER • LABEL • OHP FILM • Fig. 3-18 3-12 - Brother International HL-3400CN | Service Manual - Page 42
HL-3400CN SERVICE MANUAL 3.4.2 Install the envelope adapter NOTE: The specification of envelopes feedable from the specified capacity limit, otherwise it may result in paper feed jams or print quality problems. Fig. 3-20 Paper guide Paper guide 7- Fig. 3-21 A CAUTION When removing the envelope - Brother International HL-3400CN | Service Manual - Page 43
checked for correct print output. If there appear to be any print problems then the test print in the Engine Controller Mode should be used if power button is on the front left side of the printer. (2) Connect the connector of the power cable to the printer. i 19P\ower button Fig. 3-23 0 N (3) - Brother International HL-3400CN | Service Manual - Page 44
HL-3400CN SERVICE MANUAL (6) Press the Sel button to set the printer off-line. The On Line LED goes off. (7) Hold down the Shift button and press the Test button so that the printer enters the test mode. (8) Press the A or V button to scroll through the display until the desired test mode appears, - Brother International HL-3400CN | Service Manual - Page 45
V button. (15) Warming-up starts and continuous print will be automatically carried out after warming-up. NOTE: If the duplex unit is installed onto the printer, the screen on the right appears after selecting the colour on screen (d). (16) Press the Font button to stop the test print and then push - Brother International HL-3400CN | Service Manual - Page 46
with normal On-Line Printing according to the following procedures. Since this service manual does not refer to the interface connection or operation of the host computer, read the printer User's Guide and any manuals detailing the operation procedure of the host computer before starting normal On - Brother International HL-3400CN | Service Manual - Page 47
to print both side of paper automatically. Note that the lower tray unit must be installed onto the printer when using the duplex unit. For the details such as specifications, installation or disassembly procedure, see the service manual for the duplex unit (DX-3400). 4.3 Font Card I Flash Memory - Brother International HL-3400CN | Service Manual - Page 48
HL-3400CN SERVICE MANUAL 4.4 Network Option The printer has a modular input / output (MID) interface slot on the interface controller at the rear of the printer. The slot allows you to install a commercial MID-compatible sharing/networking card. Since the NC-3100h network board is installed in - Brother International HL-3400CN | Service Manual - Page 49
on the card. / d.,- 0 e (9) Retain the cover plate and secure the two screws to hold the plate. MIO card Fig. 3-31 4.5 RAM Expansion The printer has 64 Mbytes of memory standard and 2 slots for optional expansion memory. The memory can be expanded up to 320 Mbytes by installing commercially - Brother International HL-3400CN | Service Manual - Page 50
to remove the main controller board from the printer. Main controller board HL-3400CN SERVICE MANUAL Fig. 3-32 (4) Hold the DIMM with into the printer by sliding it into the guide rails. (7) Secure the main controller board with the two screws. 4.6 HDD (Hard Disk Drive) The printer allows - Brother International HL-3400CN | Service Manual - Page 51
the rear of the PCB. (7) Connect the flat cable to the main controller board. (8) Install the main controller board into the printer by sliding it into the guide rails. (9) Secure the main controller board with the two screws. 3-22 Flat cable Fig. 3-36 HDD ) 0 I a 6 6 Fig. 3-37 Flat cable 0 Fig - Brother International HL-3400CN | Service Manual - Page 52
HL-3400CN SERVICE MANUAL CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS - Brother International HL-3400CN | Service Manual - Page 53
System and Transfer System 1.4.1 Structure of the printer 1.4.2 Basic structure of the printing system 1.4.3 Details of each process 1.5 Scanning System 1.6 Paper Transportation System 1.6.1 Outline 1.6.2 Structure of paper transportation system 1.7 Fusing Unit 1.7.1 Structure 1.7.2 Fusing process - Brother International HL-3400CN | Service Manual - Page 54
HL-3400CN SERVICE MANUAL CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 1. BASIC STRUCTURE 1.1 Mechanical Structures This laser beam color printer (hereinafter called "Printer) consists of five mechanical systems; Print, Transfer, Scanning, Paper Transport and Control System. The printer produces color - Brother International HL-3400CN | Service Manual - Page 55
Unit AC Discharger Unit Transfer Roller Paper Discharger Second Transfer 06-Resistration Roller 0.. Transport Roller Drum Cleaner Unit Main Motor MM Developer Motor DM Drum Cleaning Operation Transfer Drum First Transfer. OPC Belt Toner Cartridge Y Development M II/F Controller MCTL - Brother International HL-3400CN | Service Manual - Page 56
HL-3400CN SERVICE MANUAL (5) Control System The control system consists of the following 4 (four) control parts and runs the printer by processing the interface signals transmitted from the Host computer and interfacing to the print, transfer, scanning and transport systems. • Sequence Control • - Brother International HL-3400CN | Service Manual - Page 57
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS Transfer crum OPC belt 0 O OK Toner cartridge O Fig. 4-3 ® First Transfer Toner a YYY ♦/ ♦ C C C C C Y YY 1/ Transfer Drum ® Second Transfer C C C pp // ♦/T//7 Paper © Fusing Red Cyan Green 1 IR c:i//••/77 C G Paper Fig. 4-4 - Brother International HL-3400CN | Service Manual - Page 58
HL-3400CN SERVICE MANUAL 1.3 Structure of the OPC Belt The OPC belt consists of a surface as shown in Fig.4-5 as the main part of the print system. OPC belt OPC belt cartridge Toner cartridge K." Transfer drum K Fig. 4-5 Laser unit Electrode Photoconductor (OPC) / , Aluminum deposit layer - Brother International HL-3400CN | Service Manual - Page 59
3 Chargimg T Exposing li Developing KCMY 6 KCMY 5 iOPC Belt Cleaning Belt Discharge A OPC Belt KCMY 4 Transfer Drum(First Transfer) Transfer Drum KCMY Transfer System Second Transfer(Paper) T 8 Paper Dischanging 9 Transfer Drum Cleaning 10 Transport System 11 Fusing - Brother International HL-3400CN | Service Manual - Page 60
HL-3400CN SERVICE MANUAL 1.4.1 Structure of the printer No. Component Part 1 Charger 2 Laser unit 3 Toner cartridge 4 OPC belt cartridge 5 Transfer drum 6 Erase lamp 7 Cleaning blade 8 Transfer roller 9 Paper discharger 10 Drum cleaner 11 Fusing unit 12 Paper exit unit Process - Brother International HL-3400CN | Service Manual - Page 61
potential of the transfer drum is GND. I Fusing Unit • • • • • Paper Discharger • • • A Transfer Roller !Cleaning Unit' F 4p • Transfer Drum OPC Belt • • • • • • • • • • t,* Toner !Toner Cartridge' • • • • • • • • • • ;j • • yr Develop ITT IPaper Cleaning Erase Lamp - Brother International HL-3400CN | Service Manual - Page 62
HL-3400CN SERVICE MANUAL (2) Variation of OPC Belt Potential (See Fig.4-10.) i) The OPC belt is , and an electrostatic latent image is formed on the OPC belt as the result. iv) Negatively charged toner is moved onto the exposed part of the OPC belt in the development process due to the difference of - Brother International HL-3400CN | Service Manual - Page 63
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 1.4.3 Details of each process 1 Charging The charging process ensures that the OPC belt is evenly charged by the charger system. (1) Structure of the charger unit (Refer to Fig.4-8 and Fig.4-11) i) The charger unit is located as shown in Fig.4-8. ii) The - Brother International HL-3400CN | Service Manual - Page 64
HL-3400CN SERVICE MANUAL 2 Exposing The exposing process means that the OPC belt surface is exposed to the laser beam to form an electrostatic latent image. (1) Structure of laser - Brother International HL-3400CN | Service Manual - Page 65
OPC belt surface. ii) The developer roller has been biased to the potential -DBV(V). Fig.4-15 describes the relationship established between the potential of the toner, the potential -Vo(V) at the non-exposed area of OPC belt and the potential -VR(V) on the exposed area of the OPC belt. iii - Brother International HL-3400CN | Service Manual - Page 66
HL-3400CN SERVICE MANUAL Developer roller (-CBV) + (-DBV) Toner (-CBV) OPC belt DBV CBV Fig. 4-15 Toner (M) 0 0 C 0 Exposing M © Developing Fig. 4-16 - Brother International HL-3400CN | Service Manual - Page 67
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4 First Transfer (Drum) The first transfer process means that the toner image on the OPC belt is transferred onto the transfer drum. (1) Structure of the Transfer Drum (Refer to Fig.4-8.) i) The drum is located as shown - Brother International HL-3400CN | Service Manual - Page 68
HL-3400CN SERVICE MANUAL (2) First Transfer Process (Refer to Fig the transfer drum and the color toner images overlap on the transfer drum. v) Upon completion of the drum transfer process, the complete toner image is transferred onto paper in the paper transfer process. OPC belt Residual charge - Brother International HL-3400CN | Service Manual - Page 69
Fig.4-8. ii) The light source of the erase lamp is 24 light emitting diodes (LEDs). (2) Process of Discharging (Refer to Fig.4-19.) i) Though the toner image was transferred to the transfer drum in the drum transfer process, there is still a residual charge on the OPC belt. ii) The residual charge - Brother International HL-3400CN | Service Manual - Page 70
HL-3400CN SERVICE MANUAL 6 Belt Cleaning The belt cleaning process means that the residual toner adhering to the OPC belt surface is Cleaning (Refer to Fig.4-20.) i) There is residual toner on the OPC belt as it has not been completely transferred in the drum transfer process. ii) - Brother International HL-3400CN | Service Manual - Page 71
is moved to the positively charged paper. v) The transported paper with the toner transferred to it is moved to the paper discharging process. Paper discharger Transfer roller Transfer drum I ci 0 VAC Thy Toner image Paper VAC: Power supply for paper discharging THV: Power supply for transfer - Brother International HL-3400CN | Service Manual - Page 72
HL-3400CN SERVICE MANUAL 8 Paper Discharging The paper discharging process is where the transported paper onto which the toner transfer has been completed is separated from the transfer drum by applying an AC charge to the paper. (1) Structure of Paper Discharger (Refer to Fig.4-22.) i) The AC - Brother International HL-3400CN | Service Manual - Page 73
roller rotates in contact with the drum cleaning brush. (2) Process of Drum Cleaning (Refer to Fig.4-23.) i) There is residual toner on the surface of the transfer drum after the paper transfer process. ii) The Drum cleaning brush is positively self-biased and so the negatively charged residual - Brother International HL-3400CN | Service Manual - Page 74
HL-3400CN SERVICE MANUAL 1.5 Scanning System This printer employs a semiconductor laser diode as a light source. PD: Laser diode control circuit. Beam detector. • BTD mirror: Beam timing detector mirror to guide the laser beam to the PD sensor. Laser unit box 9 Dust proof glass 4 r- Developer belt - Brother International HL-3400CN | Service Manual - Page 75
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS (2) Specification: Specification of the laser unit is as follows; Item Specifications Rated output of laser diode 5 mW. Wave length of laser beam Approx.785nm. Scanning density 600dpi Scanning width 310mm Scanner motor speed 24,072rpm Number of - Brother International HL-3400CN | Service Manual - Page 76
HL-3400CN SERVICE MANUAL 1.6 1.6.1 Paper Transportation System Outline This printer employs automatic paper feeding from the media cassette. When toner images are formed on the transfer drum through the operations of the print system and transfer system, paper is fed by the pick-up roller and - Brother International HL-3400CN | Service Manual - Page 77
passes between the heat rollers. Heat and pressure is applied to the paper when passing between the heat rollers so that the toner image is melted and fused onto the paper. 1.7.1 Structure The fusing unit consists of the following component parts; (Refer to Fig.4-26.) CD Fuser roller: C) Back - Brother International HL-3400CN | Service Manual - Page 78
HL-3400CN SERVICE MANUAL 1.7.2 Fusing process D Silicone oil supplied from the oil bottle is applied to the surface of fuser roller. C) The toner image has been transferred onto the paper, but not yet fused. C) Transported paper passes between the heater roller and back-up roller. ® Each roller is - Brother International HL-3400CN | Service Manual - Page 79
To control the print process from the paper feed through to the paper exit. O Laser Output Control: To toner empty status. C) Interface Control: (Video Signal) To process the input and output signals to and from the external controller (host). 6 Control Panel Indicator: To display the printer - Brother International HL-3400CN | Service Manual - Page 80
HL-3400CN SERVICE MANUAL Host Computer II Control Panel Main Motor I/F Controller Video Controller I/F Control Cooling Fan Cooling Fan DM Scanner Motor Belt Sensor Drum Sensor ATC (4 pcs.) Y MC LDU PD MCTL (Engine Controller) Sequence Control Temperature Control Toner Connection - Brother International HL-3400CN | Service Manual - Page 81
Output 2 Engine controller PCB Control, Control Panel Indications, Toner Empty (MCTL PWB) Sensing Control, Error Processing Control, Interface Control. 3 Control panel PCB To display the printer's operation status and (Panel PWB) support the control panel switches. 4 LDU PCB To control - Brother International HL-3400CN | Service Manual - Page 82
Layout of PCBs 3. Control panel PCB (Panel PWB) 10. High-voltage power supply (HVU) PCB 1. Video controller PCB 9. Power supply (LVPS) PCB HL-3400CN SERVICE MANUAL 6. Erase lamp 8. 1OD2 PWB 7. IOD1 PWB 2. Engine controller PCB (MCTL PWB) Fig. 4-29 4. LDU PCB 5. PDU PCB 4-31 - Brother International HL-3400CN | Service Manual - Page 83
MM DM Function To drive the OPC belt and the paper transport system. To drive the toner cartridge and the developing system. 3 Scanner motor SCM To cover (TR unit cover) switch OZFAN To exhaust the ozone from the (OZ) printer (charger unit). HTFAN (EX) CTLFAN (PS) To exhaust the heat of the - Brother International HL-3400CN | Service Manual - Page 84
HL-3400CN SERVICE MANUAL (3) Clutches (Refer to Fig.4-31.) No. Name Function To feed paper by coupling the feed roller to the 1 Paper feeding clutch main gear unit at the correct timing for paper feeding. 2 Registration clutch To transport paper toner cartridge by coupling that toner - Brother International HL-3400CN | Service Manual - Page 85
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS Layout of Clutches 0 10 e' re" 0 T2 8 7 6 5 Fig. 4-31 4-34 - Brother International HL-3400CN | Service Manual - Page 86
HL-3400CN SERVICE MANUAL (4) Sensors No. Name Code Function 1 Paper size sensor 2 Paper feeding sensor PSU PS 1 Photo sensor to detect the paper size. Photo sensor to detect when paper is fed from the media cassette. 3 Paper exit sensor 4 Paper empty sensor PS 2 PS 3 Photo sensor to detect - Brother International HL-3400CN | Service Manual - Page 87
to detect) 13. Cleaning roller sensor 15. Paper full sensor 5. Oil sensor 9. Belt sensor 8. Drum encoder sensor 6. OHP sensor 2. Paper feeding sensor 4. Paper empty sensor 1. Paper size sensor 16. Toner key sensor 3. Paper exit sensor 7. Drumjam sensor 10. Toner sensor 12. Home position sensor ! 11 - Brother International HL-3400CN | Service Manual - Page 88
HL-3400CN SERVICE MANUAL 2.2 Control System - Control of the Print Process A Micro CPU mounted on Switches --o- o-cTo-c70 Fig. 4-33 CPU Laser Control Paper Empty Sensor Paper Feed Sensor Toner Empty Sensor Paper Size Sensor Paper Exit Sensor OHP Sensor Drum Jam Sensor Cleaning Roller Sensor - Brother International HL-3400CN | Service Manual - Page 89
Name Function 1 Sequence Control To control the sequence of printer operations. 2 Temperature Control To control the temperature of the fixing unit. 3 Toner Empty Sensing Control To detect the toner empty status of each toner cartridge. 4 Control Panel Control To control the control panel - Brother International HL-3400CN | Service Manual - Page 90
HL-3400CN SERVICE MANUAL (2) Laser Drive Control Circuit Laser Drive Control Circuit (LDC) consists of the video signal input circuit, laser drive circuit, laser diode, output sensing circuit and - Brother International HL-3400CN | Service Manual - Page 91
of the Fusing Temperature Each roller of the fusing unit is controlled to maintain the appropriate temperature so that toner will be fixed correctly onto the print paper. FLS: Thyristor to switch the power supply to the heat lamp. TFU1fTFU2 - Brother International HL-3400CN | Service Manual - Page 92
HL-3400CN SERVICE MANUAL CM3 AD CM2 ACOFF-P RY-1 PC HON-N FLS \V Fusing Unit CM1 TFU, TFU2 // BR HR 77 - // /7 THERR ACOFF HON GA/CPU Fig. 4-36 - Brother International HL-3400CN | Service Manual - Page 93
TS: TA: TPS: To maintain the temperature for fixing of the toner at 150°C by turning the thyristor on and off. Reference temperature RY turns off, the power supply to the heat lamp is shut down and the printer stops operating. Limit temperature when the thermal fuse will start to melt and shut - Brother International HL-3400CN | Service Manual - Page 94
HL-3400CN SERVICE MANUAL (4) Interface Control (a) Interface Type The video interface handles Option) N Lower Tray(1) Unit (Option) L ower Tray( 2) Unit (Option) Video Interface / DC Power Supply Connector I Printer Engine Controller :C - DC Power Supply Laser Printer Controller (L PC) - Brother International HL-3400CN | Service Manual - Page 95
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS (c) Interface Circuit (Printer side) Table 4-1: Interface Circuit No. Interface Circuit Signal Name O-1 1 M5M34050 isoo • .• • 2 M5M34050 +5V I 22 LI 22012 I 3 T tz• 0.01/IF 330O - SN74LS14 GND GND . +5V I 3.3KS/ I 4 - - Brother International HL-3400CN | Service Manual - Page 96
HL-3400CN SERVICE MANUAL (d) Connector Pin Assignment The connector in the printer to connect to the controller board is type 128A-064S2BL14A(DDK) or the equivalent. Table 4-2. Connector Pin Assignment Pin No. 1A 2A 3A 4A 5 6A - Brother International HL-3400CN | Service Manual - Page 97
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 2.3 2.3.1 Main PCB (Video Controller PCB) Outline The main PCB consists of the circuits which perform the following functions; • Receive the printing data from the computer. • Convert the received data to the bitmap data such as characters or graphics. • - Brother International HL-3400CN | Service Manual - Page 98
Main PCB Block Diagram +6v O Regurator PO3ORV31 O +3.3v +3.3v CPU /./ PD30210 (VR4310-167) Clock Generator C8750 66MHz(CPU,SDRAM) 33MHz(PCI) 48MHZ(RS232C) CDCC I/F 5v +3.3v Brnet BOARD PCI-BUS +5v/+3.3v PU-Address/Data MultiBUS ASIC MB87F4561 CS DOM RAS CA WE,MA LCX16245 +3.3v SDRAM - Brother International HL-3400CN | Service Manual - Page 99
Controls memory * Controls interrupts * Timer * External interfaces (Centronics, BR-NET, iDE, PCMCIA, MIO) * Engine interface (Video signal control) * Supports Software (3) Gate array block • Model name: • Appearance: • Functions: SLA5099H F0J manufactured by Epson 160-pin QFP Engine control, RS - Brother International HL-3400CN | Service Manual - Page 100
HL-3400CN SERV10E MANUAL (6) DIMM block DIMM (Dual-Inline-Memory-Module) allows memory extension by up to 128MB in each socket. 2 DIMM sockets are available. The following type of - Brother International HL-3400CN | Service Manual - Page 101
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS Fig.4-38 shows the timing of each signal after the power switch is turned on. Power On I READY-N PRREQ-N VSYNC-N VIDEO-P 210s MAX. 0.1sec. MIN. 15sec. MAX. (K) data (C) data 1.0sec. MAX. 3.75s 3.0sec. MAX. for Continuous Printing (M) data Y data - Brother International HL-3400CN | Service Manual - Page 102
Main PCB Circuit Diagram (1/9) 436 r! rd, VR4310-167 +"° VDD CND ADD CND ITTTTTTTTTTTT, 73 ADD CND- 0 -• CND-0 -4 VDD 0 29 VDD OV 32 VDD VDD 1Tv1To1T,1T9T1„T1T1;T11T1oT1,T1HT1Tm1:, 48 44 VDD VDD 68 VDD 0 72 VDD I; 104 X 23 OV ,, , , , 76 VDD 99 VDD VDD DOD --4 CND 3C . - Brother International HL-3400CN | Service Manual - Page 103
Main PCB Circuit Diagram (2/9) R8751V-40 1.14 POODRV31 C3 100u 16.3V1 C48 104 Vin V 2 CS IC521 CSI 10u I1041 104 +3V C4 47u 16.3V1 104 x 4' umi g; 2 2 2 gt°- .35 E MI3B7F4560 C54 `'1s2'0gi%, 104 R118 R119 2400Ce IK US/ I.8K NS/ 3400C 680 IV/ C106 050 .29 C8750 XIN I5 C122 050 ( - Brother International HL-3400CN | Service Manual - Page 104
Main PCB Circuit Diagram (3/9) 6 v I 10 11 12 \ (01-09C) ADR CO2 :251 C01-08G> IDRDN CO2-088) CSROMNO CO2-088) CSROMNI (02-088) CSROMN2 CO 1-09(0 DC00 '311 (01-060) 91.15DIR (01-00C) BUSENN SV 100u t6 .341 4 C13 C17 C12 \ D31 \ D30 N D2S \ D28 \ D27 \ D26 \ D25 \ D24 \ D23 \ D22 \ D21 \ D20 - Brother International HL-3400CN | Service Manual - Page 105
Main PCB Circuit Diagram (4/9) 2 3 TJ i 7 10 11 12 .35-060 CNA COO (05-0311/ CSDRASN (05-03ED CSDCASN (05-030 CSDREN (02-080 SDCSNO (02-04D) SDCLKO (05-058) CBAO (05-058) CBA1 (01-09C) D[00:311 (02-09F) SDDOM CO '31 .23 UPD456484.165-A 10 12.3. VCC BBCRAG VCC 17,4,2 VCC +3V0 SDDIR10 - Brother International HL-3400CN | Service Manual - Page 106
Main PCB Circuit Diagram (5/9) 2 I 3 I 4 5 I 6 v I 7 I 8 I 9 10 11 12 A A an-Dsco DE00:31] C= -120 DIR CC -12C1 CLIC C265 C266 N SLOT1 SLOT2 CO2-08C) 5DWEll 032-08C3 SOCA. IORDN CO2-08C1 SORASU (02-08C) SICASO CO2-080 SDWEN OV. 026 74LC/C18374 ,; VCC 31 VCC 92 V[T 24 2DIR - Brother International HL-3400CN | Service Manual - Page 107
Main PCB Circuit Diagram (6/9) 4 7 8 10 11 12 CO I-09G) ADR[02'25] N IDADRO2 (09-11C) 4550 IDADRO3 (09-11C) A IDADRO4 (09-11C) 0- OV A 0+5V N N CDCC IIEEE12848 P1 10 741-1CT245 PS C08-040 VIDEON ENGINE t.SV > R113 000 C2 1 IODU 16.3V, +5V +5V 413( +SV 4GV 683 +5V 83 , 551 - Brother International HL-3400CN | Service Manual - Page 108
Main PCB Circuit Diagram (7/9) 2 3 4 5 7 8 10 11 12 A (01-09G) ADR 002'253 4{35 F 118B7F45130 4{28 SLA6088y~ A LOC11[610 '16] 032-011-1/ 102-0IF> GASCLK - 112-usecLK LOCALD15-122- LOCALD141HpW1 LOC1115/ LOCD14/ C• -04G) EtIGINT1 O. -07G> RSINTN l24 LOCBENO 81, EFGINTH . .CRSINTN - Brother International HL-3400CN | Service Manual - Page 109
Main PCB Circuit Diagram (8/9) 2 3 4 5 6 7 8 10 11 12 C07-096, PCMD[00'15] N CMS C A 0887F4560 RA63 103 RA6I103 o+54 A 106-00D) DCCI \ C06-08A, STBN C06-08A, INITN (06-0M) .LINN (06-0/3A) HEIUSY 271 INI TN 19CSELINN 'WtHEIUS, \ \ DC8 npcc. 220 nc6 DC7 \ ncs DC4 g 12 DC6 5 - Brother International HL-3400CN | Service Manual - Page 110
Main PCB Circuit Diagram (9/9 2 4 +320 036 D MBS7F4560 +3V 41 I • -el7I0 PCIINTN . -07D, PCIBRN PCIINTNO E, CPCIBRNO 3V C~- RB PCIINTNI 119 pCIBRNl R89 103 Oc -6170 CX - 07E> C. - Bi7D . -07D PCICMD3 PCICMD2 PCICI101 PCICM00 115 PCICMD3 PCICMD2 PCICMD I IS PCICMDO V -07C, FRAMEN Cm - Brother International HL-3400CN | Service Manual - Page 111
3V, 8.5A +5V-2 +24V-1 +24V, 6.5A HP 120V, 8A HN 220V, 5A Use For control of the printer For control of the laser For control of the interface (7A Max.) For control of printer charging. For connection of the fuser heater (HP). For connection of the fuser heater (HN). (2) Layout of Connector - Brother International HL-3400CN | Service Manual - Page 112
HL-3400CN SERVICE MANUAL o O HP DBF BI O -Jsr 0 Inlet - Black 0 t \ O O O It 0 0 0 0 G 0 0 O O O gill ° h];11 0 ° LE z 0 0 0 O CT) aa 0 O 0 0 O ri 0 1:)0 m0 GM) Fig. 4-40 Power Switch 4-61 - Brother International HL-3400CN | Service Manual - Page 113
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS (3) Connector Pin Assignment ACN1 MoLex: 53313-2815 Pin # , Signal Name Interface 1 +5V-1 +5V-1 Output 3 +5V-1 +5V-1 Output 5 +5V-D +5V-D Output 7 +5V-D +5V-D Output 9 ACSYNC-N AC Zero-Cross Signal (Open Collector Output) 11 +24V +24V Output - Brother International HL-3400CN | Service Manual - Page 114
HL-3400CN SERVICE MANUAL 2.5 High-voltage Power Supply Unit (1) Outputs and Function No. Function Power Supply 400V 200V - 400V 4 Second transfer THV(+) 400V - 3,000V 5 Transfer roller cleaning 6 Paper discharging 7 Drum cleaning THV(-) ACV(-) DCV(+) FCBV 600V 4.9KV 400V 200V - 1,000V - Brother International HL-3400CN | Service Manual - Page 115
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS (3) Connector Pin Assignment BCN1 MoLex: 53313-1815 Pin # Signal Name Interface 1 +24V-1 +24V-1 3 FUCHK Sensor Signal of Fuser Unit Installation 5 ACVON-N AC Output ON Signal 7 CHVON-ON CHV Output ON Signal 9 CBVPWM-N CBV PCB Control Signal 11 - Brother International HL-3400CN | Service Manual - Page 116
HL-3400CN SERVICE MANUAL 2.6 Connection Diagram CONNECTION DIAGRAM HIGH-VOLTAGE POWER SUPPLY UNIT o giN 101 HVPS Paper Toner Sensor TTR Toner Sensor PSU Paper iff.i-. -:1,1:1%' - Brother International HL-3400CN | Service Manual - Page 117
sensor DPJ Drum jam sensor OIL Oil sensor BPS Belt sensor TBLE / TBFL Waste toner sensor 1OO2 IOD2 PWB 1OO3 1OO3 PWB FBCM Cleaning cam clutch TRCM TR cam clutch LFU Lower tray unit PCLU Paper feeding clutch PSL(MC) / Developer cam clutch PSL (KY) RECL Registration clutch 4-66 - Brother International HL-3400CN | Service Manual - Page 118
DCON-N 18 TH2 3) DCN3: For Factory Use Only (4 pins) Pin No. 1 2 3 4 Signal TESTO1 TESTI1 TESTO2 TESTI1 4) DCN5 IOD1 PVVB Pin No. 1 2 Signal REARDOPEN - P NC 3 TOPDOPEN - P HL-3400CN SERVICE MANUAL 4-67 - Brother International HL-3400CN | Service Manual - Page 119
PVVB (10 pins) Pin No. 1 2 3 4 5 6 7 8 9 10 Signal +24v-1 +24v-1 +24v-1 PGND PGND PGND +5v-1 SGND SGND +5v-D 7) DCN4: 1O01 - Paper Empty Sensor 1O01 - Paper Feeding Sensor 1O01 - Drum Encoder Sensor 1OD1 - OHP Sensor Pin No. Signal 1 +5v-D 2 HPSEN - N 3 SGND 4 +5v-D 5 PT1 - N 6 SGND 7 +5v - Brother International HL-3400CN | Service Manual - Page 120
HL-3400CN SERVICE MANUAL 81 DCN6: 1OO1 - Pacer Size Sensor Pin No. Signal 1 +5v-D 2 PSU1 3 PSU2 4 PSU3 5 PSU4 6 PSU5 7 SGND 9) DCN7: IOD1 - Toner NC 13) DCN14: 1OD1 - Fuser Fan IOD1 - Paper EA Sensor IOD1 - Cleaning Roller Sensor IOD1 - Paper Full Sensor Pin No. Signal 1 +5v-D 2 - Brother International HL-3400CN | Service Manual - Page 121
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 14) ECN1: MCTL PWB - 1O01 (22 pins) Pin No. Signal 1 DCL(C)ON-P 2 DCL(M)ON-P 3 DCL(Y)ON-P 4 DCL(K)ON-P 5 PSL(KY)ON-P 6 PSL(MC)ON-P 7 MMCLK 8 M MON-N 9 MMREV-N 10 MMENC 11 RECLON-P 12 AHUMB 13 ISCK 14 IDATA 15 ILOAD 16 FBCLON-P 17 FBSLON-P 18 - Brother International HL-3400CN | Service Manual - Page 122
HL-3400CN SERVICE MANUAL 24) ECN17: 10D2 - Waste Toner Sensor Pin No. 1 2 3 4 Signal TBFL1-N SGND WTLEDON SGND 25) ECN10: 10D2 - Cleaner Cam Clutch Pin No. Signal 1 +24v-1 2 NC 3 NC 4 FBSLON-N 26) ECN8: 1002 - TR - Brother International HL-3400CN | Service Manual - Page 123
ODATA7 9 LCDRS 10 LODE 11 PASWRDN 12 PALEDWRN 13 SGND 14 +5v-1 15 LCDBLED 16 NC 36)37) CNDUP: Printer - Duplex Unit Pin No. 1 2 3 Signal D-COMMAND SGND DUMBUSY2-N 4 SGND 5 D-STATUS 6 SGND 7 23 NC 24 NC 38) DCN15: 1OO1 - Toner Key Sensor Pin No. Signal 1 TONEROK-N 2 NC 3 SGND 4-72 - Brother International HL-3400CN | Service Manual - Page 124
1. PANEL LAYOUT 2. VIDEO CONTROLLER MODE 2.1 Configuration of Operational Mode 2.2 Toner Save Mode I Power Save Mode 2.3 Line Test Mode 2.4 DRAM Test 3.1 Configuration of Operational Mode 3.2 Operation of Normal Mode 3.3 Service Mode 3.4 Adjustment Work Procedures 3.4.1 Adjustment of top and left - Brother International HL-3400CN | Service Manual - Page 125
HL-3400CN SERVICE MANUAL CHAPTER 5 CONTROL PANEL OPERATION 1. PANEL LAYOUT Copy Pages Orientation Feeder . • . . • • ■ Emulation Mode §:11:2 K C M Y Ready On Line Data 4 0 OSel Form Feed 0 6 Alarm Feeder 9 8 Mode Font • 0 O O O Emulation - Brother International HL-3400CN | Service Manual - Page 126
. (1) Normal Mode: After turning on the printer, the printer goes into Normal Mode. This mode provides normal printing for the end user. The following section describes the toner save mode and the power save mode. For other modes, refer to the user's guide. (2) Line Test Mode: This mode provides - Brother International HL-3400CN | Service Manual - Page 127
HL-3400CN SERVICE MANUAL 2.2 Toner Save Mode I Power Save Mode The toner save mode allows you to reduce the printer running cost and improve the life expectancy of the toner cartridge. The power save mode allows you to save electricity when the printer is on but not being used. (1) Turn - Brother International HL-3400CN | Service Manual - Page 128
the NVRAM size Displays the paper size of the upper cassette (Tray 1). Displays the paper size of the lower cassette (Tray 2). Check/delete/import/ the A button. LINE TEST (3) Press the Set button to make the printer start the self-test. (4) Press the Continue button to implement the LCD TEST - Brother International HL-3400CN | Service Manual - Page 129
HL-3400CN SERVICE MANUAL (5) Toner L: Upper Cassette M: Lower Cassette N: Upper Cassette Paper O: Lower Cassette Paper P: Upper Cassette Media Q: Lower Cassette Media R: Paper Sensor 1 S: Paper Sensor 2 T Paper installed into the printer is displayed as follows; RAM CHECK START RAM SIZE = 16M RAM SIZE = - Brother International HL-3400CN | Service Manual - Page 130
not installed. TRAY 2 = SIZE ERR: The paper size is other than A4 or Letter size. (10) Press the Continue button to implement the FLASH CARD1 RAN TEST. CARD1 R/W START CARD1 R/W OK CARD1 RAN OK: The flash memory card works correctly. CARD1 RAN ERROR:The flash memory card has a problem. NO FLASH - Brother International HL-3400CN | Service Manual - Page 131
HL-3400CN SERVICE MANUAL (11) Press the Continue button to implement FLASH CARD2 RAN TEST. CARD2 R/W START 4, CARD2 R/W OK CARD2 R/W OK: The flash memory card works correctly. CARD2 R/W ERROR:The flash memory card has a problem. NO FLASH CARD2: The flash memory card is not installed. WP FLASH CARD2 - Brother International HL-3400CN | Service Manual - Page 132
CHAPTER 5 CONTROL PANEL OPERATION 2.4 DRAM Test Mode This mode tests the memory and optional DIM Ms installed on the main (video controller) PCB. To start the test program: (1) While holding down the V button, turn on the power. "DRAM CHECK START" will be displayed. Press the - Brother International HL-3400CN | Service Manual - Page 133
HL-3400CN SERVICE MANUAL 2.5 Program Version Display Mode This mode displays the firmware version of the controllers. 1 While holding down /XX/XX Hour/ \ Minu\te Second (7) *Press the Continue button. Year/Month/Date of the network is displayed. NETW XXXX/7/ Year Month Second 5-11 - Brother International HL-3400CN | Service Manual - Page 134
the Continue button. Hour/Minute/Second of the font is displayed. FONT XX/XX/XX Hour/ Minute Second 3 *Press the Continue button. Version of the network is displayed. NET VER. X.XX Version 4 Press the Set button. Version of the program is displayed. PACK VER. X.XX Version 5 Press the Continue - Brother International HL-3400CN | Service Manual - Page 135
HL-3400CN SERVICE MANUAL 2.6 NVRAM Reset Mode This mode forces the NVRAM value of the video controller to be reset to the factory settings. - Brother International HL-3400CN | Service Manual - Page 136
Mode This printer has the various functions as set out in Table 5-2 for the user to easily understand the operation status of the printer engine do so, the printer goes into sleep mode. (2) Service Mode: After turning on the printer in the off-line status, the printer goes into Service Mode. This - Brother International HL-3400CN | Service Manual - Page 137
HL-3400CN SERVICE MANUAL Table 5-2 Turn on the printer while pressing the Mode, Set and T buttons. Normal Mode On Line LED ON 00 READY 01 WAIT PR2001003 Ready LED OFF Ready LED BLINKING 02 PRINT Ready LED OFF 11 CHK MEDIA TYPE CHK MEDIA FOR DUPLEX NO MEDIA CHK OUTER SELECTION 12 NO TRAY - Brother International HL-3400CN | Service Manual - Page 138
CHAPTER 5 CONTROL PANEL OPERATION 3.2 Operation of Normal Mode Normal Mode displays on the control panel the operational status of the printer when in the "ONLINE" state and the necessary information for the operator to implement ordinary maintenance work. Operation Procedures (1) Press the power - Brother International HL-3400CN | Service Manual - Page 139
FIL-3400CN SERV10E MANUAL Code No. 00 01 02 LCD Message 00 READY [*2 [*1] ] [*4] 01 WAIT [*2 [*1] ] [*4] 02 PRINT [*5] [*1] [*2 ] [*4] Description of Message • The Ready LED is lit. • The engine has completed the warming-up process and is now ready to print. [*1]: Applicable paper - Brother International HL-3400CN | Service Manual - Page 140
feeder; /UPP: Upper cassette /LOW: Lower cassette • Confirm the media cassette / paper exit tray and reset the settings properly. • The engine is idling. • The Ready LED is lit. [1]: Paper feeder without the paper cassette is indicated as follows; UPPER: Upper cassette /LF1: Lower cassette (1) /LF2 - Brother International HL-3400CN | Service Manual - Page 141
HL-3400CN SERVICE MANUAL Code No. 12-2 13 14-1 14-2 14-3 LCD Message STACKER FULL 12 STACKER FULL [*4] Description of Message • The engine is ready to print. • The Ready LED is lit. • Remove the paper on the stacker (paper exit tray), then press the Font button.. REPLACE TONER 13 REPLACE TONER - Brother International HL-3400CN | Service Manual - Page 142
CG 16 ALIGN [*5] TONER CG [*4] Description of Message • The engine is idling. • The Ready LED is lit. [*61 The type of misprint error is indicated as follows; NOPQR: No PRREQ-N signal is available. PAPER: No paper is available in the feeder while executing the print operation after receipt of - Brother International HL-3400CN | Service Manual - Page 143
FIL-3400CN SERV10E MANUAL Code No. 16-4 16-5 16-6 17 18 LCD Message ALIGN BELT CG [*71: The kind of jam (location of jam) is indicated as follows; FEED: Paper feeder INNER: Inside of the printer OUTER: Paper exit unit DRUM: Transfer drum DPL: Inside the duplex unit • This message can be - Brother International HL-3400CN | Service Manual - Page 144
) from the video controller. • The printer is ready to print after the warming-up process of the engine. • The engine is stopped. • The Ready LED is lit. [*91: Service Call error code is indicated as follows; For the details of error codes, refer to Chapter 8 "Troubleshooting" in this manual. 5-22 - Brother International HL-3400CN | Service Manual - Page 145
HL-3400CN SERVICE MANUAL 3.3 Service Mode Service Mode is a unique mode for the maintenance of the printer only, without the video controller card. In this mode, you can check the operation status of the printer engine Offline and also carry out maintenance work for each of the printer components. - Brother International HL-3400CN | Service Manual - Page 146
(message), press the Font button one more time. (e) -> (d) 6) If it is desired to return to On-line mode, e) press the Sel button. (f) -> (g) LCD Message SERVICE MODE r, 1,TEST PRINT 31 GRID PRINT > GRID PRINT 31 GRID PRINT > Y/M/C/K/R/G/B R:YM G:YC B:MC 31 GRID PRINT [YM] 31 GRID PRINT - Brother International HL-3400CN | Service Manual - Page 147
HL-3400CN SERVICE MANUAL PR2000046 32 NEXT CARE INFORMATION Information relating to 240K (240K) NEXT FC ROLL c) 019000P 13: Replacement Paper Feeding Kit (PF1) 14: Replacement Paper Feeding Kit (PF2) d) NEXT BL UNIT 15: Replacement Paper Feeding Kit (PF3) 12000P 16: Replacement Kit 120K (120K - Brother International HL-3400CN | Service Manual - Page 148
CHAPTER 5 CONTROL PANEL OPERATION 33 CASSETTE TYPE The type of paper feeding cassette can be selected. Procedure Description of Procedures 1) Press the Continue button Font button to exit the mode from screen (b). (b) -> (c) c) LCD Message SERVICE MODE r, CASSETTE TYPE 33 CASSETTE TYPE TYPE - Brother International HL-3400CN | Service Manual - Page 149
HL-3400CN SERVICE MANUAL 34 TOTAL PAGE The total number of printouts can be confirmed. Procedure [ Description of Procedures 1) Press the Continue button after selecting Screen (a) "TOTAL PAGE" mode. (a) -> (b) LCD Message SERVICE MODE a) >TOTAL PAGE 2) Select one type of page from among - Brother International HL-3400CN | Service Manual - Page 150
d) color and then press the Continue button to confirm the number of images created in that color. 6) Press the Font button to return to the e) Service mode. (d) -> (e) LCD Message SERVICE MODE r, 1,,> EACH IMAGE 35 IMAGE OF > Y/m/c/K 35 IMAGE OF Y 000098P 35 IMAGE OF - Brother International HL-3400CN | Service Manual - Page 151
HL-3400CN SERVICE MANUAL 36 CLEAR CARE Care Code counters displayed on the LCD can be unit 9 Drum cleaner / Transfer roller 10 Transfer drum 13 Paper feeding roller 14 Paper feeding roller (for LFU1) 15 Paper feeding roller (for LFU2) 16 Paper discharger Code FC BC FU 120K / OW TD PK P1 P2 - Brother International HL-3400CN | Service Manual - Page 152
and then press the Continue button if the OHP sensor signal should be ignored. (b) -> (c) In normal operation, the mode is preset to MANAGE. LCD Message SERVICE MODE a) MEDIA MANAGE 37 MEDIA MANAGE b) > MANAGE/DEFIANCE - Brother International HL-3400CN | Service Manual - Page 153
HL-3400CN SERVICE MANUAL 39 FACTORY MODE This mode consists of 9 (nine) modes for the confirmation of operation and the resetting functions necessary for maintenance work. A CAUTION Before using - Brother International HL-3400CN | Service Manual - Page 154
Screen (a) "DP CHECK'. (a) -> (b) a) 2) Using the Set or V button, select the desired color and then press the Continue button. (b) -> (c) b) 3) The selected color toner cartridge starts to drive. If no error occurs in driving, the message "GOOD" is displayed on the LCD, otherwise "FAIL - Brother International HL-3400CN | Service Manual - Page 155
HL-3400CN SERVICE MANUAL 41 BD CHECK Laser beam position and laser power can be checked. Procedure Description of Procedures 1) Press the Continue button after selecting screen (a) "BD CHECK". (a) -> (b) a) 2) - Brother International HL-3400CN | Service Manual - Page 156
CHAPTER 5 CONTROL PANEL OPERATION 43 MARGIN ADJUST The position of the top margin and left margin can be confirmed and adjusted within the range -3.5mm max. and +3.5mm max. NOTE: It is recommended to use the default value in normal use. Do not perform this mode frequently. Procedure Description of - Brother International HL-3400CN | Service Manual - Page 157
HL-3400CN SERVICE MANUAL 44 LIFE PERIOD Replacement life of the periodical Transfer drum 10: 240K replacement kit (f) (g) PERIOD BC UNIT d) 13: Paper Feeding Kit 1 (h) 120000 P SET 14: Paper Feeding Kit 2 15: Paper Feeding Kit 3 16: 120K Replacement Kit (i) (j) PERIOD FU UNIT e) (k) - Brother International HL-3400CN | Service Manual - Page 158
CHAPTER 5 CONTROL PANEL OPERATION PR2001003 45 NVRAM TUNE UP This mode is not used in normal operations, but is used when fine adjustment of the HVPSU voltage values is required. Do not use this mode unless you are sure that you understand the effects of making adjustments to the various charge - Brother International HL-3400CN | Service Manual - Page 159
HL-3400CN SERVICE MANUAL 45-1 LP TUNE UP This mode should be used when optical density, line thickness and/or color reproduction needs to be adjusted. The adjustment is - Brother International HL-3400CN | Service Manual - Page 160
CHAPTER 5 CONTROL PANEL OPERATION 45-2 THV TUNE UP This mode shall be used when the transfer voltage needs to be adjusted due to errors such as transfer failure onto the media. The adjustment is used to change the transfer voltage, subject to the media to be used, against the reference value 0 ( - Brother International HL-3400CN | Service Manual - Page 161
HL-3400CN SERVICE MANUAL 45-3 DBV TUNE UP This mode shall be used when the image optical density needs to be adjusted. Adjustment of the developer bias voltage against - Brother International HL-3400CN | Service Manual - Page 162
CHAPTER 5 CONTROL PANEL OPERATION 45-4 CBV TUNE UP This mode should be used when image defects attributed to the OPC belt need to be improved. Adjustment is to alter the OPC belt bias voltage against the reference value 0 (zero) in the range -4 to +4. NOTE: Do not perform this mode frequently. - Brother International HL-3400CN | Service Manual - Page 163
HL-3400CN SERVICE MANUAL 45-5 FBV TUNE UP This mode should be used when image defects attributed to the transfer drum need to be improved. Adjustment is to adjust - Brother International HL-3400CN | Service Manual - Page 164
UP This mode should be used to improve the problem when there is insufficient separation of paper from the transfer drum (when the winding jam occurred around the drum). Using the mode, you can adjust the bias voltage of paper discharging output from the high-voltage power supply unit. Adjustment - Brother International HL-3400CN | Service Manual - Page 165
HL-3400CN SERVICE MANUAL 46 NVRAM INITIAL This mode can initialize (data clear) all the data in the NVRAM on the MCTL PWB. AXCAUTION BEFORE USING THIS MODE, THE - Brother International HL-3400CN | Service Manual - Page 166
CHAPTER 5 CONTROL PANEL OPERATION 47 TOTAL PAGE SET This mode can reset the number of total pages in the NVRAM whenever NVRAM INITIAL has been executed or the MCTL PWB is replaced. NOTE: Do not perform this mode other than when replacing the MCTL PWB. [ Description of Procedures LCD Message - Brother International HL-3400CN | Service Manual - Page 167
HL-3400CN SERVICE MANUAL 48 EACH IMAGE SET This mode can reset the number of total pages of each color in the NVRAM whenever NVRAM INITIAL is executed or - Brother International HL-3400CN | Service Manual - Page 168
CHAPTER 5 CONTROL PANEL OPERATION 49 NEXT LIFE SET This mode can set the replacement timing (number of prints) of periodic replacement parts. NOTE: Do not perform this mode other than when replacing the MCTL PWB. Description of Procedures 1) Press the Continue button after selecting Screen (a) " - Brother International HL-3400CN | Service Manual - Page 169
HL-3400CN SERI/10E MANUAL margin will be required. (1) Execute "GRID PRINT" in Service Mode. (2) Measure the position 'A' and 'B' of top margin. [Leading execute "GRID PRINT" and confirm the margins. Paper feeding direction , Leading dedge co lir Left margin CAI" - Brother International HL-3400CN | Service Manual - Page 170
the engine NVRAM. (1) Follow the procedures set out in Section 3.3 `Service Mode' in this chapter. (2) Select RAM TUNE UP mode. (3) Select the desired TUNE UP ADC TUNE UP Adjustment of paper discharging output Reduction of winding bias paper jam around the drum. 5-48 - Brother International HL-3400CN | Service Manual - Page 171
HL-3400CN SERVICE MANUAL 3.4.3 Confirmation and setting of total number of printouts The total number of printouts is stored in the RAM. Confirmation and setting of total number of - Brother International HL-3400CN | Service Manual - Page 172
CHAPTER 5 CONTROL PANEL OPERATION 3.4.5 PR2001003 Initial setting of engine NVRAM Implement the initial setting at the replacement of MCTL PWB after clearing the contents of NVRAM. The number of images for each color will be reset when changing the MCTL PWB or executing NVRAM INITIAL. - Brother International HL-3400CN | Service Manual - Page 173
Guide 2.3 Cleaning the Paper Exit Roller 2.4 Cleaning the Transfer Roller 2.5 Cleaning the Paper Discharger 2.6 Cleaning the OPC Belt Cartridge 2.7 Cleaning the Transfer Drum 2.8 Cleaning the Dustproof Glass in the Laser Unit 2.9 Cleaning the Printer Interior 2.10 Cleaning the Oil Pad 3. PERIODIC - Brother International HL-3400CN | Service Manual - Page 174
HL-3400CN SERVICE MANUAL CHAPTER 6 PERIODIC MAINTENANCE 1. GENERAL 1.1 Handling Precautions Since this high quality laser printer use any solvent for cleaning, both inside and outside the printer. 7) It is strictly forbidden to dump waste toner with flammable substances or throw it into a fire. This - Brother International HL-3400CN | Service Manual - Page 175
the maintenance tools required for the printer. Table 6-1 No. Tool Name Screwdriver #2 6 Long-Nose Pliers 7 Pincette 8 Precision Driver Set (#1 - #6) 9 Gap Gauge 10 Pliers for Caliper 13 Digital Meter 14 Handy Type Cleaner unique for toner 15 Soft Fur Brush Function For M3 For M4 For - Brother International HL-3400CN | Service Manual - Page 176
HL-3400CN SERVICE MANUAL 1.3 List of Consumables for Maintenance Table 6-2 below lists the consumables for maintenance. Table 6-2 No. Tool Name 1 Toner Cartridge (Y) 2 Toner Cartridge (M) 3 Toner Cartridge (C) 4 Toner Cartridge (K) 5 Fuser Cleaner / Oil Bottle 6 OPC Belt Cartridge 7 - Brother International HL-3400CN | Service Manual - Page 177
periodic maintenance cleaning for the following parts. (1) Register Roller (2) Paper Guide (3) Paper Exit Roller (4) Transfer Roller (5) Paper Discharger (6) OPC Belt Cartridge (7) Transfer Drum (8) Dustproof Glass of the Laser Unit (9) Printer Interior (10) Oil Pad A WARNING • Before starting any - Brother International HL-3400CN | Service Manual - Page 178
HL-3400CN SERVICE MANUAL Periodic Maintenance Cleaning Work Table 6-3 No. Parts Name 1 Register Roller Cleaning Work Description 1. Open the transfer unit. 2. Clean roller and surrounding area using a dry cloth. 2 Paper Guide 3 Paper Exit Roller 1. Remove the media cassette from the printer. - Brother International HL-3400CN | Service Manual - Page 179
maintenance 9 Printer Interior 10 Oil Pad 1. Remove the toner cartridges and OPC belt cartridge. 2. Clean the printer's base, using a toner vacuum cleaner at every periodic maintenance service to prevent any problems from occurring. A• CAUTION The register roller, paper guide, andpaper exit roller - Brother International HL-3400CN | Service Manual - Page 180
HL-3400CN SERVICE MANUAL 2.1 Cleaning the Register Roller The register roller should be cleaned (3) Using a cotton cloth, clean the register roller incorporated in the transfer unit to remove the paper dust. Register roller 0 Transfer unit Fig. 6-1 A CAUTION NEVER use alcohol or similar solvents for - Brother International HL-3400CN | Service Manual - Page 181
set out in Table 6-3. Tools to Prepare Cotton cloth (2 - 3 pieces) Cleaning Procedure (1) Remove the media cassette from the printer. (2) Remove paper in the media cassette. (3) Using a dry cotton cloth, clean the paper guide to remove paper dust. Paper guide i --------____ Fig. 6-2 6-10 - Brother International HL-3400CN | Service Manual - Page 182
HL-3400CN SERVICE MANUAL 2.3 Cleaning the Paper Exit Roller The paper exit roller should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 - 3 pieces) Cleaning Procedure (1) Turn - Brother International HL-3400CN | Service Manual - Page 183
CHAPTER 6 PERIODIC MAINTENANCE 2.4 Cleaning the Transfer Roller The transfer roller should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 - 3 pieces) Cleaning Procedure (1) Turn off the power supply, and unplug the power cable. - Brother International HL-3400CN | Service Manual - Page 184
HL-3400CN SERVICE MANUAL 2.5 Cleaning the Paper Discharger The paper discharger should be cleaned according to the periodic maintenance power cable. (2) Open the transfer unit. (3) Remove the paper discharger. (Fig.6-5) Paper discharger Transfer unit (4) Clean the discharger case housing with - Brother International HL-3400CN | Service Manual - Page 185
CHAPTER 6 PERIODIC MAINTENANCE 2.6 Cleaning the OPC Belt Cartridge The OPC belt cartridge should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. A PRECAUTION • Do not directly touch the OPC belt surface with bare hands or gloves. • If the belt is exposed for - Brother International HL-3400CN | Service Manual - Page 186
HL-3400CN SERVICE MANUAL 2.7 Cleaning the Transfer Drum The transfer drum should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton - Brother International HL-3400CN | Service Manual - Page 187
cloth (2 - 3 pieces) • Cotton swab (2 - 3 pieces) Cleaning Procedure (1) Turn off the power supply. (2) Open the top cover and the front cover. (3) Remove the toner cartridges and the OPC belt cartridge. (4) Open the dust-proof glass from the laser unit. (5) Clean the surface of the dustproof glass - Brother International HL-3400CN | Service Manual - Page 188
HL-3400CN SERVICE MANUAL 2.9 Cleaning the Printer Interior The printer interior (bottom) should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare • Toner vacuum cleaner • Cotton cloth (2 - 3 pieces) Cleaning Procedure (1) Open the top cover and - Brother International HL-3400CN | Service Manual - Page 189
power cable. (2) Open the top cover. (3) Remove the fusing unit from the printer and then remove the oil bottle and the fuser cleaner form the fusing unit. (4) Remove the oil pan unit from the fusing unit. (5) Scour off toner scattered on the white felt surface of the oil pad and on the surface - Brother International HL-3400CN | Service Manual - Page 190
HL-3400CN SERVICE MANUAL 3. PERIODIC MAINTENANCE PARTS Maintenance Work should be implemented according to the up sheets of paper one by one from the media cassette. 8 Transfer Drum 9 Oil Pad , LJ2215001 Forms the toner image and transfers it onto paper. . LJ2329001 Cleans paper dust from the - Brother International HL-3400CN | Service Manual - Page 191
REPLACE 24 OK KIT REPLACE PF KIT REPLACE OIL PAD Consumables Toner cartridge Black Toner cartridge Cyan, Magenta, or Yellow Oil bottle Fuser cleaner OPC belt cartridge Fusing unit Paper discharger Transfer roller / Drum cleaner Paper feeding roller / Separator pad Oil pad LCD Operator Call Message - Brother International HL-3400CN | Service Manual - Page 192
HL-3400CN SERVICE MANUAL 4. PERIODIC MAINTENANCE PROCEDURES The printer If replacement parts have to be replaced for Service reasons before their life cycle is completed then Replacement Procedure (1) Press the power button to turn off the printer. (2) Open the front cover and the top cover. ACAUTION - Brother International HL-3400CN | Service Manual - Page 193
Belt cartridge lock lever (Right) (7) Install the new OPC belt cartridge into the guides at both sides in the printer. (Fig.6-13) Guide Protective sheet Fig. 6-13 „------,_ .z• , Tension release pins is I i ---________ Guide Fig. 6-14 (8) Set the belt cartridge lock levers at both sides - Brother International HL-3400CN | Service Manual - Page 194
HL-3400CN SERVICE MANUAL 4.2 Fusing Unit Replacement Criterion of Replacement The fusing unit for cleaning • Fusing unit (one unit) Work Procedure Sequence of Disassembling (1) After turning off the printer, unplug the power cable from the power outlet. (2) Open the top cover. (3) Remove the - Brother International HL-3400CN | Service Manual - Page 195
MAINTENANCE A CAUTION • When removing the fusing unit, take care to keep the unit level so that no oil leakage or spillage occurs. • When shipping the printer, remove the oil bottle and the fuser cleaner from the fusing unit. After removing the oil bottle, be sure to remove the oil remaining in - Brother International HL-3400CN | Service Manual - Page 196
HL-3400CN SERVICE MANUAL 4.3 Transfer Roller Replacement Criterion of Replacement The transfer cleaning. 2) Transfer roller (one unit) Work Procedures Sequence of Disassembling (1) After turning off the printer, unplug the power cable from the power outlet. (2) Open the rear access cover. (Fig.6- - Brother International HL-3400CN | Service Manual - Page 197
N , Fig. 6-21 k- :. Sequence of Assembling (1) Close the rear access cover. (2) Plug the power cable into the power outlet and turn on the printer. (3) Upon completion of the warming-up process; Press the Reset button while holding down the Shift button, and select "RESET PARTS LIFE" and then - Brother International HL-3400CN | Service Manual - Page 198
HL-3400CN SERVICE MANUAL 4.4 Paper Discharger Replacement Criterion of Replacement The paper discharger should be replaced with a new discharger at the same time as the transfer roller according to the periodical maintenance cycle set out in Table 6-4. When time is due for replacement of paper - Brother International HL-3400CN | Service Manual - Page 199
discharger is mounted. (Fig.6-23) (3) Install the new paper discharger into the transfer unit. Fig. 6-23 Fig. 6-24 Sequence of Assembling (1) Close the rear access cover. (2) Plug the power cable into the printer, and turn on the printer. (3) Upon completion of the warming-up process; Press the - Brother International HL-3400CN | Service Manual - Page 200
HL-3400CN SERVICE MANUAL 4.5 Drum Cleaner Replacement Criterion of Replacement The drum cleaner should the bearing and the bias pole into the contacts. Reconfirm this connection prior to testing the printer. Necessary Tools and Replacement Materials • Two or three pieces of cotton cloth for cleaning. - Brother International HL-3400CN | Service Manual - Page 201
, indicated by a click. Sequence of Assembling (1) Install the cleaner cover. (2) Close the top cover. (3) Press the power button to turn on the printer. (4) Upon completion of the warming-up process; Press the Reset button while holding down the Shift button, and select "RESET PARTS LIFE" and then - Brother International HL-3400CN | Service Manual - Page 202
HL-3400CN SERVICE MANUAL 4.6 Ozone Filter Replacement Criterion of Replacement Although the maintenance message indicating ozone filter replacement is not displayed on the LCD, the ozone filter should be - Brother International HL-3400CN | Service Manual - Page 203
of Chapter 7. ( Paper feeding roller Fig. 6-29 Separator pad A CAUTION • This is one of the periodic replacement items, not customer service. it should be implemented upon request of the customer or at periodic maintenance. • After replacement, confirm the improvement ofpaperjam problems by test - Brother International HL-3400CN | Service Manual - Page 204
HL-3400CN SERVICE MANUAL 4.8 Transfer Drum Replacement Criterion of Replacement The transfer drum 0 Fig. 6-30 A. CAUTION • This is one of the periodic replacement items, not customer service. It should be implemented upon request of the customer or at periodic maintenance. • After replacement, - Brother International HL-3400CN | Service Manual - Page 205
CHAPTER 6 PERIODIC MAINTENANCE 4.9 Oil Pad Replacement Criterion of Replacement The oil pad should be replaced with a new one according to the periodical maintenance cycle set out in the Table 6-4. When time is due for replacement of the oil pad, the following message appears on the control panel.* - Brother International HL-3400CN | Service Manual - Page 206
assembly 4.1.11 Main gear unit 3 4.1.12 Paper feeding clutch / EP3 gear assembly 4.1.13 WT holder assembly 4.1.14 Developer drive unit 3 4.1.15 Developer clutch 3 (K, Y, M, C) 4.1.16 Toner sensor (TPD) 4.1.17 Waste toner feeder (L) 4.2 Top of the Printer 4.2.1 Upper side cover (LU) (Upper - Brother International HL-3400CN | Service Manual - Page 207
HL-3400CN SERVICE MANUAL PR2000046 4.3 Left Side of the Printer 4.3.1 MCTL PWB 4.3.2 High-voltage power supply unit (High )) 4.3.8 Interlock switch (Front) (for front cover) 4.3.9 Toner key sensor (TNK) 4.3.10 Toner sensor (TTR) 4.4 Paper Exit Unit 4.4.1 Rear cover 3 (U) 4.4.2 Top cover - Brother International HL-3400CN | Service Manual - Page 208
"High Voltage" and "Laser Radiation". Before starting any work on this printer, make sure you have read and understand the warnings set out in this manual. (3) Collect and dispose of any waste toner cartridges removed during maintenance correctly in accordance with local regulations. Do not dispose - Brother International HL-3400CN | Service Manual - Page 209
HL-3400CN SERVICE MANUAL Table 7-1: Table of Screw Sizes Used in the Printer Class Code BT3x8 Name of Screw Size and Shape of Screw M-Thread Length TS Shape T3 8mm BT3x12 T3 10mm Cross head tapping screw T4 - Brother International HL-3400CN | Service Manual - Page 210
ASSEMBLY 2. PARTS NAME 2.1 Cover Front View Control par el Upper cover 4.2.5 Top cover (Paper exit unit cover) 4.4.2 Side cover (LF) 4.2.6 Power button Front outer cover 4.5.1 Rear View Paper exit upper cover 4.4.2 Media cassette Side cover (R) 4.1.1 Base cover (R) 4 1.2 Fig. 7-1 Upper side - Brother International HL-3400CN | Service Manual - Page 211
2.2 Circuit Boards (PWBs) Panel PWB 4.2.2 High-voltage power supply PCB 4.3.2 Video controller • PCB HL-3400CN SERVICE MANUAL Erase lamp 4.2.11 1OD2 PWB 4.1.5 IOD1 PWB 4.2.7 MCTL PWB 4.3.1 Low-voltage power supply PCB 4.3.7 Fig. 7-3 2.3 Motor Units Ozone fan Fuser fan (Cooling i'ari 4.4.2 - Brother International HL-3400CN | Service Manual - Page 212
4.3.4 (PS4) OHP sensor 4.6.6 (OHP) Paper feeding sensor 4.6.7 (PS1) Paper empty sensor 4.6.6 (PS3) Paper size sensor 4.6.4 (PSU) Toner key sensor (TNK) 4.3.9 Drum jam sensor (DPJ) 4.2.12 Toner sensor (TPD) 4.1.16 Toner sensor (TTR) 4.3.10 Toner sensor assembly Interlock switch (Front - Brother International HL-3400CN | Service Manual - Page 213
inclusive) BD3 4.1.10 Gear Assembly Main Gear Unit 4.1.11 Paper Feeding Clutch EP3 Gear Assembly 4.1.12 WT Holder Assembly 4.1.13 Developer Drive 4.1.14 Unit Developer Clutch 1 Toner Sensor (TPD) 4.1.15 4.1.16 Waste Toner Feeder (L) 4.1.17 2.TOP Upper Side 4.2.1 Cover (LU) V Side - Brother International HL-3400CN | Service Manual - Page 214
Side cover 3 (R) (1) Remove the set screw BT4x10 (1 pc.) of side cover 3 (R) at the rear of the printer. m pis Side cover 3 (R) Fig. 7-7 (2) Slide the side cover 3 (R) in the direction of the arrows as shown in Fig.7-8. (3) Remove the side cover 3 (R) by releasing the - Brother International HL-3400CN | Service Manual - Page 215
HL-3400CN SERVICE MANUAL 4.1.2 Base cover 3 (R) (1) Remove the set screws BT4x10 (2 pcs.) from the base cover 3 (R). (2) Remove the base cover 3 (R) from the base. 6 'Ye Base cover 3 (R) 'Ye Fig. 7-9 APRECAUTION • - Brother International HL-3400CN | Service Manual - Page 216
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 4.1.3 Main motor 3 (MM) A CAUTION Take care not to stress the motor drive PCB when removing the connector or handling the motor /PCB assembly. (1) Disconnect the cable (1 pc.) from the main motor 3 PCB. (2) Remove the tapping screws ST3x6 (4 pcs.) holding the - Brother International HL-3400CN | Service Manual - Page 217
HL-3400CN SERVICE MANUAL 4.1.4 Developer drive motor 3 (DM) A CAUTION Take care not to stress the motor drive PCB when removing the connector or handling the motor /PCB assembly. (1) Disconnect - Brother International HL-3400CN | Service Manual - Page 218
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY 4.1.5 1OD2 PWB (1) Disconnect all the harness connectors (15 pcs.) connected to the IOD2 PWB. (2) Remove the fixing screw ST3x6 (1 pc.) from the IOD2 PWB. (3) Remove the IOD2 PWB from the main frame. A PRECAUTION When handling the 1002 PWB take care not to - Brother International HL-3400CN | Service Manual - Page 219
4.1.6 Registration clutch (1) Remove the outer plastic C ring from the shaft. (2) Pull out the registration clutch from the shaft. HL-3400CN SERVICE MANUAL 0 0 O Registration clutch C ring Fig. 7-14 4.1.7 TR cam clutch 3 (1) Remove the outer plastic C ring from the shaft. (2) Pull out the TR - Brother International HL-3400CN | Service Manual - Page 220
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 4.1.8 Cleaner clutch 31Cleaner cam clutch 31Fuser clutch 3 (1) Remove the outer plastic C ring from the shaft of each of the clutches. (2) Pull out the cleaner clutch 3, Cleaner cam clutch 3 and fuser clutch 3 from their shafts at the same time. / Cleaner cam - Brother International HL-3400CN | Service Manual - Page 221
HL-3400CN SERVICE MANUAL 4.1.9 Ozone fan (OZFAN) ( :ooling fan (OZ) (1) Remove the screws ST3x6 (3 pcs.) and BT4x8 (1 pc.) to remove the stay (R). (2) Remove the set screw ST3x6 (1 pc.) to - Brother International HL-3400CN | Service Manual - Page 222
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 4.1.10 BD3 gear assembly (1) Remove the screws ST3x6 (3 pcs.) from the BD3 gear assembly. (2) Remove the BD3 gear assembly from the frame. NOTE: Be sure to remove the set screws BT4x10 (2 pcs.) from the upper cover before removing the screws ST3x6 (3 pcs.) from - Brother International HL-3400CN | Service Manual - Page 223
HL-3400CN SERVICE MANUAL 4.1.12 Paper feeding clutch / EP3 gear assembly (1) Remove the set screw ST3x6 (1 pc.) to remove the metal retainer. (2) Remove the outer plastic C ring from the shaft. (3) Remove the paper that the waste toner sensor is assembled onto the WT holder assembly. 0 0 oo 0 0 - Brother International HL-3400CN | Service Manual - Page 224
(1pc.) to remove the cover RF. (2) Release the harnesses from the harness holder. (3) Remove the developer drive gear for each color toner from the inside of the developer driver unit 3. (4) Remove the set screws ST3x6 (4 pcs.) to remove the developer drive unit 3 from the main frame. NOTE The gears - Brother International HL-3400CN | Service Manual - Page 225
HL-3400CN SERVICE MANUAL 4.1.15 Developer clutch 3 (K, Y, M, C) (1) Remove the inner E ring Fig. 7-24 4.1.16 Toner sensor (TPD) (1) Remove the set screws ST3x6 (2 pcs.) from the toner sensor PCB. (2) Disconnect the connector to the toner sensor PCB. (3) Remove the toner sensor PCB from the main - Brother International HL-3400CN | Service Manual - Page 226
ST3x6 (1 pc.) holding the metal plate of the waste toner feeder. (2) Pull out the waste toner feeder (L) from the main frame. 0 0 a 0 Metal plate . 4tv Waste toner feeder (L) Fig. 7-26 A CAUTION Be sure to vacuum up waste toner remaining inside the plastic tube with a vacuum cleaner before removing - Brother International HL-3400CN | Service Manual - Page 227
HL-3400CN SERVICE MANUAL 4.2 4.2.1 Top of the Printer Upper side cover (LU) ( !pper side cover 3 (I.:) (1) Open the top cover. (2) Remove the set screw BT4x10 securing the upper side cover (LU). (3) Press the exterior - Brother International HL-3400CN | Service Manual - Page 228
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY 4.2.2 Panel PWB (including LCD) (1) Remove the shoulder screw SP4x9* (1 pc.) from the panel case assembly and disconnect the connector. (2) Remove the set screws BT3x8 (4 pcs.) from the panel PWB and remove the panel shield plate, PWB, LCD and panel button from - Brother International HL-3400CN | Service Manual - Page 229
HL-3400CN SERVICE MANUAL 4.2.4 Base cover 3 (L) (1) Remove the set screws BT4x10 (2 pcs.) from the base cover 3 (L). (2) Remove the base cover 3 (L) from the base by releasing it from the front of the printer first. 4 N O Base cover 3 (L) Fig. 7-31 A. PRECAUTION • When re-assembling the - Brother International HL-3400CN | Service Manual - Page 230
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY 4.2.5 Upper cover ( op cover ) (1) Open the front cover and release the belt cartridge lock levers. (2) Remove the side cover 3 (R). (Refer to subsection 4.1.1 in this chapter.) (3) Remove the set screws BT4x10 (2 pcs.) securing the upper cover. (Top x 1 and - Brother International HL-3400CN | Service Manual - Page 231
HL-3400CN SERVICE MANUAL 4.2.7 IOD1 PWB (1 Remove the set screws ST3x6 (4 pcs.) from the shield ( is caused due to electrostatic charges. 4.2.8 Control fan (CTFAN) ( ) / Interlock switch (Top) (Paper exit unit) (1) Remove the ozone filter. (2) Remove the set screw ST3x6 (1 pc.) to remove the - Brother International HL-3400CN | Service Manual - Page 232
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY (3) Remove the fan motor and interlock switch from the fan case after releasing the fan cover plastic clips. Control fan case ) a Fan motor 4 0 Control fan case Fig. 7-37 (4) Remove the interlock switch and operating arm from the case. A CAUTION Since the - Brother International HL-3400CN | Service Manual - Page 233
HL-3400CN SERVICE MANUAL 4.2.9 Belt sensor (PBS) (1) Remove the set screws ST3x6 (1 pc paper. Then push the transfer drum 3 up and forwards from the transfer unit side. (3) Release the transfer drum 3 from the shaft supports, and pull up and remove the transfer drum 3 from the top of the printer - Brother International HL-3400CN | Service Manual - Page 234
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY NOTE: • For easier removal, push the drum upwards and diagonally forwards. • When re-assembling the transfer drum 3, slide the drum shaft between the metalplates and ensure the drum is fully located into the correct retaining position. A PRECAUTION Do not touch - Brother International HL-3400CN | Service Manual - Page 235
HL-3400CN SERVICE MANUAL 4.2.12 Drum jam sensor (DPJ) (1) Release the catches and remove the cover F. (2) Disconnect the drum jam sensor connector. (3) Remove the drum jam sensor. NOTE: The - Brother International HL-3400CN | Service Manual - Page 236
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 4.3 Left Side of the Printer 4.3.1 MCTL PWB A CAUTION Remove the Main (Video Controller) PWB before starting this disassembly. (1) Remove the set screw ST3x6 (1 pc.) from shield cover 'B'. Slide the cover - Brother International HL-3400CN | Service Manual - Page 237
HL-3400CN SERVICE MANUAL 4.3.2 High-voltage power supply unit ( (1) Remove the set screws ST3x6 (2 pcs.) to remove the shield cover `A'. (2) Remove the set screws ST3x6 (4 pcs.) to remove the - Brother International HL-3400CN | Service Manual - Page 238
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY A CAUTION When disconnecting the connector from the CB V terminal, push both sides of the connector. Pulling it hard may cause connector damage. AWARNING The high voltage power supply unit generates high voltages of up to 5KV. You can get an electric shock if - Brother International HL-3400CN | Service Manual - Page 239
HL-3400CN SERVICE MANUAL 4.3.4 Drum encoder sensor (PS4) (1) Remove the sensor case assembly from the frame (L) by releasing the two catches. (2) Disconnect the connector (1 pc.) to the encoder sensor. (3) - Brother International HL-3400CN | Service Manual - Page 240
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 4.3.6 Rear cover 3 (R) (1) Remove the set screw BT4x10 (1 pc.) of rear cover 3 (R). (2) Remove the rear cover 3 (R). CD Rear cover 3 (R) Fig. 7-51 4.3.7 Low-voltage power supply unit ( (1) Remove the power switch key by pulling it forwards. (2) Remove the - Brother International HL-3400CN | Service Manual - Page 241
HL-3400CN SERVICE MANUAL (4) Remove the set screw ST3x6 (2 pcs.) holding the power inlet base ea --\ Fig. 7-54 -1/27)---,--... A WARNING The ground wire is very important for the safety of users. Upon replacement of the low-voltage power supply unit, confirm that the ground wire (green and yellow - Brother International HL-3400CN | Service Manual - Page 242
HL-3400CN SERVICE MANUAL (4) Remove the set screw ST3x6 (2 pcs.) holding the power inlet base ea --\ Fig. 7-54 -1/27)---,--... A WARNING The ground wire is very important for the safety of users. Upon replacement of the low-voltage power supply unit, confirm that the ground wire (green and yellow - Brother International HL-3400CN | Service Manual - Page 243
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 4.3.8 Interlock switch (Front) (for front cover) (1) Remove the set screw (1 pc.) to remove the switch holder assembly from the frame. (2) Release the two hooks to remove the interlock switch. (3) Disconnect the switch connector. (4) Remove the interlock switch - Brother International HL-3400CN | Service Manual - Page 244
HL-3400CN SERVICE MANUAL 4.3.9 Toner key sensor (TNK) (1) Remove the set screws ST3x6 (4 pcs.) from the toner key sensor PCB. (2) Disconnect the connector (1 pc.) connected to the IOD1 PWB. (3) Remove the toner key sensor PCB. Toner key sensor Fig. 7-56 4.3.10 Toner sensor (TTR) (1) Remove the - Brother International HL-3400CN | Service Manual - Page 245
connector in the cover assembly. (2) Remove the support pins SP4x3 (2 pcs.) at the left and right sides that act as the paper exit unit hinges. (3) Remove the paper exit unit from the printer. (4) Remove the side cover assembly from the paper exit unit 3. Paper exit unit 3 Side cover assembly Fig - Brother International HL-3400CN | Service Manual - Page 246
HL-3400CN SERVICE MANUAL (5) Press the top cover back plate backwards to release the fan motor assembly from the paper exit guide unit. (6) Remove the fuser fan motor and filter from the case. Filter Fuser fan motor Fan case Paper exit guide unit Top cover (Paper exit unit 3 ) Fig. 7-60 (7) - Brother International HL-3400CN | Service Manual - Page 247
sensor Sensor base @ Paper exit guide o) 0 0 .- . a 0 a Fig. 7-62 4.4.4 Paper full sensor (PS6) (1) Disconnect the harness connected to the paper full sensor. (2) Release the catch to remove the sensor unit from the paper exit guide. Paper exit guide ; , 0 0 0 a Paper full sensor Fig - Brother International HL-3400CN | Service Manual - Page 248
HL-3400CN SERVICE MANUAL 4.4.5 Paper exit sensor (PS2) (1) Disconnect the harness connected to the paper exit sensor. (2) Remove the paper exit sensor from the sensor base. Paper exit sensor 4 Sensor base Fig. 7-64 NOTE: When re-assembling the cleaning roller sensor and paper • Paper exit - Brother International HL-3400CN | Service Manual - Page 249
from the paper exit guide. (2) Remove the C ring and washer from the left and right hand sides of the roller. (3) Remove the plastic bush at both sides. (4) Remove the paper exit roller 3 from the paper exit guide. Plastic retainer ) O Ar!"-sr, Paper exit roller 3 Paper exit guide O Plastic bush - Brother International HL-3400CN | Service Manual - Page 250
HL-3400CN SERVICE MANUAL 4.5 4.5.1 Front of the Printer Front outer cover ( (1) Open the front cover unit 3. (1) Close the front cover. (2) Remove the set screw ST4x6 (6 pcs.) to remove the front cover supports at left and right sides from the frame. (3) Remove the set screw ST3x6 (1 pc.) from the - Brother International HL-3400CN | Service Manual - Page 251
CHAPTER 7 DISASSEMBL Y & RE-ASSEMBLY (4) Remove the screws BT4x8 (4 pcs.) from the front inner cover. (5) Unhook the two hooks by slightly lifting up the front inner cover and remove the hinge from the front cover unit 3. (6) Disconnect the connectors (4 pcs.) from the front cover unit 3. Hinge ( - Brother International HL-3400CN | Service Manual - Page 252
HL-3400CN SERVICE MANUAL 4.5.3 Laser unit (Scanner motor inclusive) ( :ptical unit 3) (1) Remove the (3) Disconnect the harness connector (1 pc.) from the laser unit. (4) Remove the laser unit from the printer. 6N. Laser unit Fig. 7-71 AWARNING • There is a classIIlb laser within the laser unit. - Brother International HL-3400CN | Service Manual - Page 253
cover ( ) / Transfer unit 3 (1) Open the rear access cover. (2) Remove the fixing screw BT4x10 (1 pc.) of the retaining strap supporting the transfer unit 3 to the printer body. (3) Take the transfer unit 3 out by holding the unit horizontally to remove the transfer unit 3. Retaining strap - Brother International HL-3400CN | Service Manual - Page 254
HL-3400CN SERVICE MANUAL 4.6.2 Transfer roller 3 (1) Lift the transfer roller 3 lock levers to release both ends of the roller. (2) Pull up and remove the transfer roller 3. Transfer roller 3 r , N ...---- Lock - Brother International HL-3400CN | Service Manual - Page 255
set screws ST3x6 (2 pcs.) from the paper guide (UL). (2) Remove the paper guide (UL). (3) Disconnect the harnesses (2 pcs.) connected to the OHP sensor and paper empty sensor. (4) Remove the paper feeding roller from the rear of the printer. I Paper guide (UL) Paper feeding roller Fig. 7-77 7-50 - Brother International HL-3400CN | Service Manual - Page 256
HL-3400CN SERVICE MANUAL Separator pad (2) Fig. 7-78 PRECAUTION Do not touch the surface of the paper feeding roller and separator pad (2). 4.6.6 Paper paper guide assembly (UL). (3) Remove the paper empty sensor (PS3) from the paper guide assembly (UL) Paper guide assembly (UL) 0 0 Paper - Brother International HL-3400CN | Service Manual - Page 257
on the paper feeding sensor. 0 Paper feeding sensor Fig. 7-80 4.7 Fusing Unit DANGER Note in Parts Replacement • The fusing unit consists of important safety parts. Therefore, replacement of parts or disassembly and maintenance work should only be done at an appropriate service facility by - Brother International HL-3400CN | Service Manual - Page 258
HL-3400CN SERVICE MANUAL PR2000046 4.7.1 Oil pan unit 3 (1) Remove the fixing screw ST3x6 (1 pc.) to remove the F cover (L). (2) Remove the fixing screw ST3x6 (1 pc.) to remove the F cover (R). (3) Remove - Brother International HL-3400CN | Service Manual - Page 259
hand side.) (3) Remove the fixing screws ST3x6 (4 pcs.) to remove the heater support (HR/BR) at the right hand side. (4) Remove the screw with washer M3x6 roller : 420W NOTE: When installing the new fusing unit into the printer, you have to wait approximately for 30 minutes after the unit is installed - Brother International HL-3400CN | Service Manual - Page 260
CONTENTS CHAPTER VIII TROUBLESHOOTING 1. OUTLINE OF TROUBLESHOOTING 2. OPERATOR CALL 2.1 Video Controller Mode 2.2 Engine Controller Mode 3. PAPER TRANSPORT ERROR 3.1 Feed Jam 3.2 Inner Jam 3.3 Outer Jam 3.4 Others 4. SERVICE CALL 4.1 Video Controller Mode 4.2 Engine Controller Mode 5. IMAGE - Brother International HL-3400CN | Service Manual - Page 261
HL-3400CN SERVICE MANUAL CHAPTER 8 TROUBLESHOOTING This chapter contains troubleshooting information for both the Video Controller Mode and the Engine Controller Mode. If any problem occurs during the normal usage of the printer, which means the printer is being used in the Video Controller Mode, - Brother International HL-3400CN | Service Manual - Page 262
CHAPTER 8 TROUBLESHOOTING 1. OUTLINE OF TROUBLESHOOTING Printer Problem Operator Call [Section 2.1 V Paper Transport Error Yr [Section 2 & 3] Service Call Image Failure [Section 5] V Enter the Engine Controller Mode V Turn off the power, hold down the Mode, Set and V buttons and then turn the - Brother International HL-3400CN | Service Manual - Page 263
HL-3400CN SERVICE MANUAL 2. OPERATOR CALL 2.1 Video Controller Mode The Ready LED is lit and an applicable message appears on the liquid crystal display (LCD) in the following cases; 1) Consumables require to be replenished. 2) Waste toner pack is full of waste toner. 3) Paper jam. 4) Periodic - Brother International HL-3400CN | Service Manual - Page 264
is installed. Install the lower tray unit. The transfer roller is not installed. Install the transfer roller. The printer detects the Install the Brother original toner toner installed is not Brother cartridge. original. Output stacker is full. Remove the paper from the output stacker. 8-6 - Brother International HL-3400CN | Service Manual - Page 265
HL-3400CN SERVICE MANUAL PR2000046 Display Message FUSER OIL LOW REPLACE FCR REPLACE OPC BELT REPLACE FUSER REPLACE 120K KIT REPLACE 240K KIT REPLACE TRF DRUM REPLACE PF KIT1 REPLACE PF KIT2 REPLACE PF KIT3 REPLACE OIL PAD* NEAR WASTE TONER NEAR STACK FULL 32 BUFFER ERROR 34 MEMORY FULL Meaning - Brother International HL-3400CN | Service Manual - Page 266
CHAPTER 8 TROUBLESHOOTING PR2000046 Display Message Meaning Countermeasure 40 LINE ERROR is used, check the interface cable connection. 41 PRINT CHECK Error in communication with Turn off the printer. Wait a few the engine controller seconds, then turn it on again. 42 DEVICE1 (2/3) FULL - Brother International HL-3400CN | Service Manual - Page 267
HL-3400CN SERVICE MANUAL 2.2 Engine Controller Mode The Ready LED is lit, and applicable messages appear on the liquid crystal display (LCD) in the following cases; 1) Consumables require to be replenished. 2) Waste toner pack is full of waste toner. 3) Paper jam. 4) Periodic maintenance. 5) - Brother International HL-3400CN | Service Manual - Page 268
CHAPTER 8 TROUBLESHOOTING Display Message Meaning Countermeasure Paper jam inside printer Open the transfer unit, and remove paper jammed inside. 17 MEDIA JAM OUTER Paper jam at paper exit area Open the transfer unit / paper exit unit and remove paper jammed inside. 17 MEDIA JAM DRUM Paper - Brother International HL-3400CN | Service Manual - Page 269
HL-3400CN SERVICE MANUAL 3. PAPER TRANSPORT ERROR Paper is transported through the path shown in Fig.8-1. Paper jams at the following locations are easily cleared. • Paper Feeding Roller • Fusing Unit • Transfer Unit • Paper Exit Unit Paper exit roller OPC belt cartridge Fusing unit Oil - Brother International HL-3400CN | Service Manual - Page 270
8 TROUBLESHOOTING 3.2 Inner Jam Table 8-4 Problem Item Transfer Unit Step 1 2 3 4 5 Check Item Open the transfer unit and check. Is there any paper inside the unit? Is the transfer roller firmly locked by the lock lever? Is the paper discharger unit installed in place? Is there paper dust - Brother International HL-3400CN | Service Manual - Page 271
HL-3400CN SERVICE MANUAL 4. SERVICE CALL If errors or failures occurred inside the printer, the applicable error message will be displayed on the control panel, and the printer stops. If errors or failures repeat even after resetting the power button, confirm the error code and then refer to the - Brother International HL-3400CN | Service Manual - Page 272
CHAPTER 8 TROUBLESHOOTING 4.1 Video Controller Mode Table 8-7 Service Call Message Meaning Countermeasure 61 PROG ERROR E2 88 WARNING E3 88 WARNING E4 Developer drive motor Main motor error Drum error Toner sensor error See flow chart El later in this section. See flow chart E2 later - Brother International HL-3400CN | Service Manual - Page 273
HL-3400CN SERVICE MANUAL Service Call Message Meaning 88 WARNING ES TR cam clutch error 88 WARNING E6 section. Duplex controller hardware See flow chart P1 described in the error DX-3400 service manual. 88 WARNING P3 Feeder pass select solenoid error See flow chart P3 described in the DX - Brother International HL-3400CN | Service Manual - Page 274
CHAPTER 8 TROUBLESHOOTING Service Call Message 88 WARNING P4 88 WARNING PS Meaning Countermeasure Duplex motor error See flow chart P4 described in the DX-3400 service manual. Outer pass select solenoid See flow chart P5 described in the error DX-3400 service manual. 88 WARNING P6 Optional - Brother International HL-3400CN | Service Manual - Page 275
HL-3400CN SERVICE MANUAL Code EL FO F2 F4 F5 HO H2 H3 H4 Ll L2 LL (P1) (P3) (P4) (P5) (P6) Description charts later in this section. • The code in the bracket is the error when the duplex unit is installed. For troubleshooting for those codes, refer to the DX-3400 duplex unit service manual. 8-17 - Brother International HL-3400CN | Service Manual - Page 276
HL-3400CN SERVICE MANUAL Code C3 Description of Error Cause of Error NVRAM Error 1. Failure of MCTL PCB CPU EEPROM Clearance Method 1. Turn on and off the power switch. 2. - Brother International HL-3400CN | Service Manual - Page 277
HL-3400CN SERVICE MANUAL Code Description of Error Cause of Error 1. Power Feeding Failure C7 Process Timing Error. 2. MM Failure 3. MM Input Circuit Failure Clearance Method 1. Implement the same - Brother International HL-3400CN | Service Manual - Page 278
CHAPTER 8 TROUBLESHOOTING Error Code Name of Part D1 Developer Clutch (DCLY) Confirm the connection of Connector. 4 Is the connection proper between ECN14 of 1OD2 and Clutch (DCLY) ? - Brother International HL-3400CN | Service Manual - Page 279
HL-3400CN SERVICE MANUAL Error Code Name of Part D2 Developer Clutch (DCLM) Confirm the connection of Connector. Is the connection proper between ECN15 of 1OD2 and Clutch (DCLM) ? - Brother International HL-3400CN | Service Manual - Page 280
CHAPTER 8 TROUBLESHOOTING Error Code Name of Part D3 Developer Clutch (DCLC) Confirm the connection of Connector. V Is the connection proper between ECN16 of 1OD2 and Clutch (DCLC) ? - Brother International HL-3400CN | Service Manual - Page 281
HL-3400CN SERVICE MANUAL Error Code D4 Name of Part Developer Clutch (DCLK) 4 Confirm the connection of Connector. Is the connection proper between ECN13 of 1OD2 and Clutch (DCLK) ? - Brother International HL-3400CN | Service Manual - Page 282
CHAPTER 8 TROUBLESHOOTING Error Code Name of Part D5 Developer Solenoid (PSL KY) Confirm the connection of Connector. Is the connection proper between ECN3 of 1OD2 and Solenoid ( - Brother International HL-3400CN | Service Manual - Page 283
HL-3400CN SERVICE MANUAL Error Code Name of Part D6 Developer Solenoid (PSL MC) Confirm the connection of Connector. Is the connection proper between ECN3 of 1OD2 and Solenoid ( - Brother International HL-3400CN | Service Manual - Page 284
CHAPTER 8 TROUBLESHOOTING Error Code El Concerned Part Developer Motor(DM) Is there any unusual rotation noise while printing ? 4N0 Confirm the connection of connector. YES pl 4 Replace the toner cartridge. Is the noise cleared ? NO YES Job is complete. - Brother International HL-3400CN | Service Manual - Page 285
HL-3400CN SERVICE MANUAL Error Code E2 Concerned Part Main Motor(MM) Does a belt cartridge rotate lightly ? I VES Does a fuser unit rotate lightly ? YES Confirm the connection of connector. - Brother International HL-3400CN | Service Manual - Page 286
CHAPTE8RTROUBLESHOOTING Error Code E3 Concerned Part Drum HP Sensor OYES Is a belt cartridge properly installed ? Does a transfer drum rotate lightly ? OYES Confirm the connection of connector. - Brother International HL-3400CN | Service Manual - Page 287
HL-3400CN SERVICE MANUAL Error Code E4 Concerned Part Toner Sensor PCB.(LED side) Confirm the connection of a toner sensor PCB.(LED side) connector. DCN7 of IOD1 properly connected with a connector of the toner sensor ? NO Tr YES Check the voltage(LEDON-N/P) _t- - Brother International HL-3400CN | Service Manual - Page 288
CHAPTER 8 TROUBLESHOOTING Error Code E5 Concerned Part Transfer Cam Clutch (TRCM) Confirm the connection of a transfer solenoid connector. YES V NO Is ECN8 of IOD2 properly connected with a - Brother International HL-3400CN | Service Manual - Page 289
HL-3400CN SERVICE MANUAL Error Code Concerned Part E6 Cleaning Brush Solenoid (FBCM) Confirm the connection of a cleaning brush solenoid connector. YES V Is ECN10 of 10D2 properly connected with a - Brother International HL-3400CN | Service Manual - Page 290
CHAPTE8RTROUBLESHOOTING Error Code Concerned Part E7 Cleaner Clutch Confirm the connection of a cleaner clutch connector. 1r Is ECN11 of 10D2 properly connected with a connector of the clutch ? Is ECN2 of 10D2 properly connected with DCN10 of IOD1 ? Is ECN1 of IOD1 properly connected with 11CN - Brother International HL-3400CN | Service Manual - Page 291
HL-3400CSENRVICEMANUAL Error Code Concerned Part E8 Fuser Clutch(FUCL) Confirm the connection of a fuser clutch connector. NO Is ECN9 of 10D2 properly connected with a connector - Brother International HL-3400CN | Service Manual - Page 292
+5V between DCN2-1 and 4 of IOD1? 4 4 V OYES Is E9 error cleared ? Job is complete. YES YES NO YES YES Replace the belt cartridge. Install the printer to be leveled out. Clean the belt. + NO Is E9 error cleared ? I Connect them properly. V NO Is E9 error cleared ? Replace the belt sensor - Brother International HL-3400CN | Service Manual - Page 293
a single voltage between DCN1-27 and 44 of 1OD2 to be a rising edge > YES 4 T4NO Is EL error cleared ? N YES V Job is complete. HL-3400ON SERVICE MANUAL Connect them properly. Is EL error cleared ? }NO Replace the LED PCB. Replace the IOD1 PCB. YES Job is complete. H Replace the MCTL PCB - Brother International HL-3400CN | Service Manual - Page 294
CHAPTE8RTROUBLESHOOTING Error Code Concerned Part FO Fan Motor (Control Cooling) Confirm the connection of a fan motor connector. V NO Is DCN18 of I0D1 properly connected with a connector of the fan motor ? Is DCN1 of I0D1 properly connected with 11CN of MCTL PCB ? OYES Check the voltage ( - Brother International HL-3400CN | Service Manual - Page 295
HL-3400ON SERVICE MANUAL Error Code Concerned Part F2 Fan Motor (OZFAN) Confirm the connection of a fan motor connector. 4 Is ECN5 of 10D2 properly connected with a connector of the - Brother International HL-3400CN | Service Manual - Page 296
CHAPTER 8 TROUBLESHOOTING Error Code Concerned Part F4 Heater Fan (HTFAN) Confirm the connection of a heater fan connector. Is DCN14 of I0D1 properly connected with a connector of the - Brother International HL-3400CN | Service Manual - Page 297
HL-3400CN SERVICE MANUAL Error Code F5 Concerned Part High-voltage power supply unit (HVU) Confirm the status of a charger unit. • IVES Is the charger unit properly installed ? Is a - Brother International HL-3400CN | Service Manual - Page 298
CHAPTER 8 TROUBLESHOOTING Error Code HO (wire cut/ short error of thermistor) Concerned Part Fusing Unit Confirm the connection of a fusing unit connector. • Is the fusing unit properly - Brother International HL-3400CN | Service Manual - Page 299
HL-3400CN SERVICE MANUAL Error Code Concerned Part H2,H3,H4 Fusing Unit and Others Confirm that a fusing heater is lit. V NO Is the fusing heater controlled for On/ - Brother International HL-3400CN | Service Manual - Page 300
CHAPTER 8 TROUBLESHOOTING Error Code Concerned Part L1 (Beam Detecting Error) Laser Unit Confirm the connection of an laser unit connector. NO Is the connector PDCN properly connected ? - Brother International HL-3400CN | Service Manual - Page 301
laser unit. Is L2 error cleared ? YES NO V Replace the MCTL PCB. Connect the connector properly. YES Is L2 error cleared ? I NO Job is complete. HL-3400ON SERVICE MANUAL MCTL PD LCN e / 20 ] LDU ] SCMCLK SCMRDY SCMON T 2 3 GND +24V-1 4 SM 5 Laser Unit SM LCN3 8-43 - Brother International HL-3400CN | Service Manual - Page 302
CHAPTER 8 TROUBLESHOOTING Error Code Concerned Part LL Laser Unit Confirm the connection of an laser unit connector. V NO Is the connector LCN3 properly connected ? Is the connector - Brother International HL-3400CN | Service Manual - Page 303
5. IMAGE FAILURE (1) (2) (3) V). (4) (5) (6) (7) (8) (9)-a MIN (9)-b (10) (11) (12) (13) (14) 8-45 Reosustion - Brother International HL-3400CN | Service Manual - Page 304
(15)-a (15)-b (16) (17) M U.E...M .■ (18) (19) (20) wide. ■ TPE. Mriil I (21) (22) t. (23) C' (24) (25) (26) MIL (27) (28) (29) 244mlrn 8-46 - Brother International HL-3400CN | Service Manual - Page 305
HL-3400CN SERVICE MANUAL 1-1 Background Phenomenon Background is smeared due to toner spread as shown in print sample (1) of Page 8-45. Main Causes (1) Too small toner mass and charging level in the developing process. (2) Poor contact of the developer roller's bias pole. (3) Life expired or failure - Brother International HL-3400CN | Service Manual - Page 306
TROUBLESHOOTING Advanced Photoscale Technology) in the driver, this problem might occur. Change the mode printer installation table. (Tilt should be less than 1°.) (2) Toner amount in the toner cartridge is insufficient. (3) Toner concentrates to one side in the toner cartridge since the toner - Brother International HL-3400CN | Service Manual - Page 307
HL-3400CN SERVICE MANUAL 1-5 Wrinkle / Image Migration Phenomenon Banding shadows of different optical density appear due to wrinkle, image migration and color misregistration occurring on the print paper as shown in print sample (5) of Page 8-45. Main Causes (1) Print paper other than the - Brother International HL-3400CN | Service Manual - Page 308
CHAPTER 8 TROUBLESHOOTING 1-6 White Line (1) Phenomenon Vertical white line appears in the Developer blade Fig. 8-3 Countermeasures (1) Implement the test print. (2) Confirm the color of the toner cartridge in question that has caused the white line. (3) Remove the foreign particles adhering to - Brother International HL-3400CN | Service Manual - Page 309
HL-3400CN SERVICE MANUAL 1-7 White Line (2) Phenomenon Vertical white line appears from the leading edge to the trailing edge of the printed image as shown in print sample (7) of Page 8-45. Main Causes The dustproof glass of the laser unit is smeared with toner cartridge and toner cartridges. - Brother International HL-3400CN | Service Manual - Page 310
TROUBLESHOOTING 1-9 Black Line / Blur in the Image Phenomenon Fine black line or blur appears in the printed image as shown in print sample (9) of Page 845. Main Causes (1) The corona wire of the paper discharger unit is dirty. (2) OPC belt surface is damaged. (3) Foreign particles (paper the toner - Brother International HL-3400CN | Service Manual - Page 311
HL-3400CN SERVICE MANUAL Vertically Staggered Image Phenomenon Printed image staggered in the vertical direction as shown in print sample (11) of Page 8-45. Main Causes (1) Shock or vibration applied to the printer not apply shock or vibration to the printer body. (2) Installation location should be - Brother International HL-3400CN | Service Manual - Page 312
CHAPTER 8 TROUBLESHOOTING 1-13 White Band Phenomenon White banding line appears in the horizontal direction, and consequently causes a missing image as shown in print sample (13) of Page 8- - Brother International HL-3400CN | Service Manual - Page 313
HL-3400CN SERVICE MANUAL 1-14 Toner Drop Phenomenon Toner spot stain is caused on the print by toner dropping within the printer engine as shown in print sample (14) of Page 8-45. Main Causes (1) Toner drops onto the transfer drum due to the breakdown of the waste toner feeder. 1-1) Mylar of the - Brother International HL-3400CN | Service Manual - Page 314
CHAPTER 8 TROUBLESHOOTING 1-15 White Spot / Black Spot Phenomenon White spots and black spots drum. (2) The OPC belt or transfer drum is damaged. (3) Foreign particles mixed in the toner. (4) Foreign particles adhering to the transfer roller, or local deformation of the transfer roller. - Brother International HL-3400CN | Service Manual - Page 315
HL-3400CN SERVICE MANUAL belt cartridge is excessive. ** This problem might occur in the first page page immediately after turning on the printer. Countermeasures (1) Reset the OPC belt the drum cleaner with a new one. 1-18 Toner Streak Phenomenon Brush mark line of uneven scanning density is - Brother International HL-3400CN | Service Manual - Page 316
CHAPTER 8 TROUBLESHOOTING 1-19 Mottle Phenomenon Variation of the scanning density is found in a new one. (See Section 4.3.2 of Chapter 7.) (4) Replace the toner cartridge with a new one. (5) Replace the paper with new paper from a freshly opened ream. 1-20 Residual Image Phenomenon Image of the - Brother International HL-3400CN | Service Manual - Page 317
HL-3400CN SERVICE MANUAL 1-21 Insufficient Gloss Phenomenon Gloss of the print is not sufficient as the fusing oil to circulate in the new fusing unit. 1-22 Back Stain Phenomenon Back side of the print paper is stained as shown in print sample (22) of Page 8-46. Main Causes Fusing unit: (1) The - Brother International HL-3400CN | Service Manual - Page 318
the fusing is insufficient. Main Causes (1) Wrong selection of print media (label or envelope, etc.) at the Host (driver) side. (2) Recommended paper is not being used. (3) Double-feed paper. (4) Failure of the fusing unit. Countermeasures (1) Adjust the mode of Host side to suit the print media in - Brother International HL-3400CN | Service Manual - Page 319
HL-3400CN SERVICE MANUAL 1-25 Vertical Smear Phenomenon Printed image is smeared vertically as shown in print sample (25) of Page 8-46. Main Causes (1) Paper dust between the cleaning blade and OPC belt. (2) Debris adhering to the base of a toner cartridge's developer roller where it contacts - Brother International HL-3400CN | Service Manual - Page 320
TROUBLESHOOTING 1-27 Color Missing Phenomenon Color is missing in the printed image as shown in print sample (27) of Page 8-46. Main Causes Fusing failure due to using damp paper or using the printer under high humidity conditions. Countermeasures (1) Use the paper immediately after open the paper - Brother International HL-3400CN | Service Manual - Page 321
HL-3400C SERVICE MANUAL APPENDIX 1. SERIAL NO. DESCRIPTIONS The descriptions as below show how to read labels fitted to the printer parts. < ID for production month of the Printer > A: January E: May B: February F: June C: March G: July D: April H: August J: September K: October - Brother International HL-3400CN | Service Manual - Page 322
Cartridge XXXXXXXXXX -COLOR LREVISION - FACTORY USE -DATE OF CARTRIDGE -*MONTH OF CARTRIDGE -*MONTH OF TONER -YEAR OF TONER *1-9 and X for Oct., Y for Nov., Z for Dec I I Fig. A- 2 (3) OPC Belt Cartridge X X X X X X - REVISION LDATE OF CARTRIDGE -*MONTH OF CARTRIDGE -*MONTH OF BELT YEAR - Brother International HL-3400CN | Service Manual - Page 323
HL-3400C SERVICE MANUAL (4) Toner Cartridge, OPC Belt Cartridge Master Box XXXX-XXX - REVISION L 2") LOT OF MONTH OF TONER CARTRIDGE /BELT CARTRIDGE -1 51- LOT OF MONTH OF TONER CARTRIDGE /BELT CARTRIDGE 2") LOT MONTH OF TONER/BELT -2' LOT YEAR OF TONER/BELT -1 5T LOT MONTH OF TONER/BELT - - Brother International HL-3400CN | Service Manual - Page 324
APPENDIX (6) Laser Unit XXXXX - REV DATE -*MONTH YEAR *1-9 and X for Oct., Y for Nov., Z for Dec. (7) Transfer Drum Fig. A- 5 XXXXXXXXXX -.7*MONTH FACTORY USE YEAR DATE *1-9 and X for Oct., Y for Nov., Z for Dec. Fig. A- 6 A-4 - Brother International HL-3400CN | Service Manual - Page 325
(8) Power Supply Unit S/N XXXXXXX FACTORY USE REV XX YY/WW XX/XX -1- - WEEK OF YEAR YEAR OF POWER SUPPLY UNIT HL-3400C SERVICE MANUAL .-, Fig. A- 7 A-5 - Brother International HL-3400CN | Service Manual - Page 326
OF ROLLERS The diameter or circumference of each roller is listed below; No. Parts Name 1 OPC Belt 2 Belt Drive Roller 3 Developer Roller 4 Transfer Roller 5 Paper Pick-up Roller 6 Transfer Drum 7 Back-up Roller 8 Fuser Roller 9 Drum Cleaner 10 Cleaning Roller 11 Register Roller 12 - Brother International HL-3400CN | Service Manual - Page 327
HL-3400C SERVICE MANUAL APPENDIX 3. SHELF LIFE OF EACH CONSUMABLE Each consumable has its own shelf life as follows. Shelf life varies depending whether the consumable packaging is open or not. Consumable Toner cartridge (all colors) OPC belt cartridge Fuser cleaner Before unpacking *1 3 years 3 - Brother International HL-3400CN | Service Manual - Page 328
coverage. Life is detected by the toner empty sensor. NOTE: Life of the starter toner cartridge supplied with the printer is half of the above figures. condition printed with 50% of monochrome and 50% of color on the letter size paper.) Pages per job 1 page Life 60,000 2 pages 3 pages 4 pages 5 - Brother International HL-3400CN | Service Manual - Page 329
HL-3400CN SERVICE MANUAL PR2000101 8) Cleaning Roller Life: 20,000 pages 35,000 60% 2 23,333 10) Transfer Drum Life: 600,000 images Condition: None 11) Paper Feeding Kit Paper Feeding Roller Life: 120,000 pages Condition: None Separator Pad Life: 120,000 pages Condition: None - Brother International HL-3400CN | Service Manual - Page 330
APPENDIX Figure from Modified by the additional life deleted figure 1) No change 2) 10 pages Add figure of 3) Add 20 pages This figure is actual next care time 1) Print 10 pages by 5 % coverage 2) Print 10 - Brother International HL-3400CN | Service Manual - Page 331
HL-3400C SERVICE MANUAL APPEND5IX. HOWTORE-ENTEORRIGINADLATATOTHEMCTLPWB ACAUTION Actions 1) and 2) MUST be carried out BEFORE the MCTL PWB is removed or the NVRAMinitialized otherwise ALL READINGS WILL BELOST. 1) Go - Brother International HL-3400CN | Service Manual - Page 332
APPENDIX After initializing all the data in the NV-RAM on the MCTL PWB, or replacing the MCTL PW B, all the original counter values for the cleaning roller, OPC belt cartridge, fusing unit, 120K kit and 240K kit should be re-entered as below; The method used to correct the counters is to reset the - Brother International HL-3400CN | Service Manual - Page 333
HL-3400C SERVICE MANUAL 6) Re-enter the FU UNIT (NC8) value as follows; i) Enter the value of NC8 - LP8 into the TOTAL PAGE counter. (i.e.) NC8 - LP8 = 39,684 - 70, - Brother International HL-3400CN | Service Manual - Page 334
APPENDIX APPENDIX 6. RE-PACKING INSTRUCTIONS APRECAUTION When re-packing the printer before shipping, be sure to follow the steps and cautions below. Failure to do so will cause toner or oil spill in the printer and severe damage to the printer. 6.1 Toner Cartridge 1) Open the front cover and - Brother International HL-3400CN | Service Manual - Page 335
from the printer. 2) Open the shutter on the OPC belt cartridge and remove toner in the cartridge with a vacuum cleaner. 3) Cover the OPC belt cartridge with the original protective sheet (black). 4) Put the cartridge into the lightproof polyethylene bag. HL-3400C SERVICE MANUAL / / 0 Fig. A- 10 - Brother International HL-3400CN | Service Manual - Page 336
the oil remaining in the fusing unit with the supplied syringe to avoid oil spill in the printer. NOTE: Re-install the fusing unit into the printer after cleaning the printer as instructed in the following section. For re-installation of the fusing unit, see Section 6.6 `Packing'. Iv Fig. A- 16 - Brother International HL-3400CN | Service Manual - Page 337
Pack 1) Remove the waste toner pack from the printer. HL-3400C SERVICE MANUAL 2) Clean toner from around the pack. Then, remove the seal from the side of the waste toner pack and fit it to cover the hole of the waste toner pack completely. 3) Put the waste toner pack into the polyethylene bag - Brother International HL-3400CN | Service Manual - Page 338
cover, side cover (L), and upper cover from the printer. ii) Remove the control fan, and then remove the waste toner feeder unit. Drum cleaner O Fig. A- 21 iii) Vacuum toner from around the other side of the waste toner feeder tube and inside the printer. (Refer to the figure on the right.) iv - Brother International HL-3400CN | Service Manual - Page 339
HL-3400C SERVICE MANUAL 4) Paper cassette Media cassette i) Remove the paper cassette from the printer and remove paper from the cassette. C ii) Vacuum up any paper dust in the paper cassette. iii) Reinstall the paper the starter kit packing; sleeve Four toner cartridges (K, Y, M, C), OPC - Brother International HL-3400CN | Service Manual - Page 340
4) Pack the printer, starter kit packing, waste toner pack, and power cable in the carton using the original packing material. Outer carton V Starter kit packing Waste toner pack'.• Power cable 5) Seal the outer carton firmly. 6) Band the carton with two plastic bands. Printer Fig. A- 27 - Brother International HL-3400CN | Service Manual - Page 341
HL-3400C SERVICE MANUAL APPENDIX 7. TO LEVEL THE PRINTER CORRECTLY Please read the leveling instructions described below carefully. If the printer is not installed level, image failures may occur or the life expectancy of the OPC belt cartridge may be shortened. Please do not install the printer as - Brother International HL-3400CN | Service Manual - Page 342
on is not level. Level / 1° Fig. A- 31 iv) The table surface the printer is installed on is not strong enough. Level . Fig. A- 32 NOTE: If you have a spirit level, put it on the output tray and install the printer as level as possible referring to the level. Spirit Level Fig. A- 33 A-22 - Brother International HL-3400CN | Service Manual - Page 343
HL-3400C SERVICE MANUAL APPENDIX 8. PAPER POSITIONS DURING DUPLEX PRINTING Fig. A-34 below shows the paper positions when printing using the available duplex printing function. Paper positions after printing single side of the first sheet PaPer feeding order 1 /2/3 / F: Front of sheet/ B: Back - Brother International HL-3400CN | Service Manual - Page 344
INDEX 2 2.5-inch HDD 3-21 A altitude ambient humidity ambient temperature ASIC auger spring gear unit automatic emulation selection automatic interface selection 2-11 2-11 2-11 4-48 7-22 1-4 1-4 B barcode base cover 3 (L) base cover 3 (R) BD3 gear assembly belt sensor bi-directional parallel - Brother International HL-3400CN | Service Manual - Page 345
PWB 8-45 3-8 2-4 7-38 7-34 7-27 7-27 7-14 L label laser unit left margin level Line Test Mode low-voltage power supply unit lower paper guide lower tray unit 2-6 1-8, 7-47 5-47 A-21 5-6 4-60, 7-36 7-50 3-18 M main gear unit 3 7-18 main motor 3 main PCB circuit diagram maintenance tool MCTL - Brother International HL-3400CN | Service Manual - Page 346
(U) cap recommended paper register roller cleaning registration clutch re-packing reprint resident printer fonts resolution RS-232C serial interface ROM S scalable font scanning system screw sensors separator pad (2) replacement sequence control serial number service call Service Mode shelf life - Brother International HL-3400CN | Service Manual - Page 347
6-12 6-24 4-8 1-8, 7-48 2-6 2-12 7-15 7-48 U unpacking upper cover upper side cover (LU) upper side cover 3 (L) 3-5 7-26 7-23 7-23 V Video Controller Mode 1-9, 5-4 W warm-up waste toner feeder (L) WT holder assembly waste toner sensor Weight 2-4 7-22 7-19 7-19 2-5 iv
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 |
 |
Brother
Color
Laser
Printer
SERVICE
MANUAL
MODEL:
HL-3400CN
Read
this
manual
thoroughly
before
commencing
any
maintenance
work.
Keep
this
manual
in
a
convenient
place
for
quick
and
easy
reference
at
al
l
times.
March,
2000
SM-PRN005