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R

COLOR LASER PRINTER

SERVICE MANUAL
MODEL:HL-2400C

Jan. `98 54S002BE0

R

COLOR LASER PRINTER

SERVICE MANUAL
MODEL:HL-2400C

© Copyright Brother 1997 All rights reserved. No part of this publication may be reproduced in any form or by any means without permission in writing from the publisher. Specifications are subject to change without notice. Trademarks: The brother logo is a registered trademark of Brother Industries, Ltd. Apple, the Apple Logo, and Macintosh are trademarks, registered in the United States and other countries, and True Type is a trademark of Apple computer, Inc. Epson is a registered trademark and FX-80 and FX-850 are trademarks of Seiko Epson Corporation. Hewlett Packard is a registered trademark and HP Laser Jet is a trademark of Hewlett Packard Company. IBM, IBM PC and Proprinter are registered trademarks of International Business Machines Corporation. Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the U.S. and other countries.

PREFACE
This service manual contains basic information required for after-sales service of the color laser printer (here-in-after 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-2400C color laser printer. This manual consists of the following chapters:

CHAPTER I :

OUTLINE OF PRODUCT Features, parts names, internal structure, and description of the control panel.

CHAPTER II :

SPECIFICATIONS Specifications, etc.

CHAPTER III :

INSTALLATION Installation conditions and installation procedures.

CHAPTER IV :

STRUCTURE OF SYSTEM COMPONENTS Basic operation of the mechanical system, the electrical system and the electrical circuits and their timing information.

CHAPTER V :

CONTROL PANEL OPERATION Operation and setting procedures on the control panel.

CHAPTER VI :

PERIODIC MAINTENANCE Description of periodic maintenance parts, and procedures for periodic replacement and cleaning.

CHAPTER VII : DISASSEMBLY Procedures for replacement of the mechanical system parts. CHAPTER VIII : TROUBLESHOOTING Description of error messages on the control panel, troubleshooting image failure, etc. APPENDICES :SERIAL NO. DESCRIPTIONS, ETC.

Information in this manual is subject to change due to improvement or re-design of the product. All relevant information in such cases will be supplied in service information bulletins (Technical Information). A thorough understanding of this printer, based on information in this service manual and service information bulletins, is required for maintaining its print quality performance and for improving the practical ability to find the cause of problems.

CONTENTS
CHAPTER I PRODUCT OUTLINE.................................................... I -1
1. FEATURES...................................................................................................... I-1 2. PARTS NAMES & FUNCTIONS...................................................................... I-4 3. INTERNAL STRUCTURE ................................................................................ I-6 4. DESCRIPTION OF CONTROL PANEL ........................................................... I-7
4.1 Video Controller Mode...........................................................................................................I-7 4.2 Engine Controller Mode.........................................................................................................I-7

CHAPTER II SPECIFICATIONS ...................................................... II-1
1. RATING .......................................................................................................... II-1 2. GENERAL SPECIFICATIONS........................................................................ II-2
2.1. Printing ................................................................................................................................II-2 2.2. Functions.............................................................................................................................II-3 2.3. Electrical and Mechanical ...................................................................................................II-3 2.4. Paper Specification .............................................................................................................II-4

3. ENVIRONMENTAL CONDITION ..................................................................... II-8
3.1 Ambient Temperature / Humidity / Altitude...........................................................................II-8

CHAPTER III INSTALLATION........................................................ III-1
1. CONDITIONS REQUIRED FOR INSTALLATION ......................................... III-1
1.1. Environmental Conditions ..................................................................................................III-1 1.2. Basic Layout of Printer Set-up Location.............................................................................III-1

2. UNPACKING ................................................................................................. III-2
2.1 Unpacking of Printer............................................................................................................III-2 2.2 Unpack the Starter Kit .........................................................................................................III-4

3. INSTALLATION WORK ................................................................................. III-5
3.1 Install the OPC Belt Cartridge .............................................................................................III-5 3.2 Install the Toner Cartridge to the Printer .............................................................................III-6 3.3 Install the Oil Bottle and Fuser Cleaner ..............................................................................III-7 3.4 Test Print.............................................................................................................................III-8

CHAPTER IV STRUCTURE OF SYSTEM COMPONENTS............IV-1
1. BASIC STRUCTURE .....................................................................................IV-1
1.1 Print System and Transfer System .................................................................................... IV-6 1.2 Scanning System ............................................................................................................. IV-21 1.3 Paper Transportation System .......................................................................................... IV-23 1.4 Fusing Unit ....................................................................................................................... IV-25

2. STRUCTURE OF THE CONTROL SYSTEM ..............................................IV-27
2.1 Basic Structure................................................................................................................. IV-27 2.2 Control System................................................................................................................. IV-36 2.3 Main PCB (Video Controller PCB).................................................................................... IV-46 2.4 Power Supply Unit............................................................................................................ IV-58 2.5 High Voltage Power Supply Unit ...................................................................................... IV-61 2.6 Wiring Diagram................................................................................................................. IV-64

CHAPTER V CONTROL PANEL OPERATION .............................. V-1
1. PANEL LAYOUT.............................................................................................V-1 2. VIDEO CONTROLLER MODE .......................................................................V-2
2.1 Configuration of Operational Mode ..................................................................................... V-2 2.2 Toner Save Mode / Power Save Mode ............................................................................... V-3 2.3 Line Test Mode ................................................................................................................... V-4 2.4 DRAM Test Mode................................................................................................................ V-8 2.5 Program Version Display Mode .......................................................................................... V-9 2.6 Test Print Mode................................................................................................................. V-10 2.7 NVRAM Reset Mode......................................................................................................... V-10

3. ENGINE CONTROLLER MODE...................................................................V-11
3.1 Configuration of Operational Mode ................................................................................... V-11 3.2 Operation of Normal Mode................................................................................................ V-13 3.3 Service Mode .................................................................................................................... V-19 3.4 Adjustment Work Procedures ........................................................................................... V-39

CHAPTER VI PERIODIC MAINTENANCE .....................................VI-1
1. GENERAL......................................................................................................VI-1
1.1 Handling Precautions ......................................................................................................... VI-1 1.2 Periodic Maintenance Cleaning.......................................................................................... VI-4 1.3 Periodic Maintenance Parts and Maintenance Cycle....................................................... VI-15

2. PERIODIC MAINTENANCE PROCEDURES ..............................................VI-18
2.1 OPC Belt Cartridge Replacement .................................................................................... VI-18 2.2 Fusing Unit Replacement................................................................................................. VI-20 2.3 Transfer Roller Replacement ........................................................................................... VI-22 2.4 Paper Discharger Unit Replacement................................................................................ VI-24 2.5 Drum Cleaner Replacement............................................................................................. VI-26 2.6 Ozone Filter Replacement ............................................................................................... VI-28 2.7 Paper Feed Roller and Separator Pad Replacement....................................................... VI-29 2.8 Transfer Drum Replacement............................................................................................ VI-30

CHAPTER VII DISASSEMBLY.....................................................VII-1
1. BEFORE STARTING DISASSEMBLY..........................................................VII-1
1.1 Precautions ....................................................................................................................... VII-1 1.2 Preparation of Disassembly .............................................................................................. VII-1

2. PARTS NAME ..............................................................................................VII-3
2.1 Cover................................................................................................................................. VII-3 2.2 Circuit Boards (PCBs) ....................................................................................................... VII-4 2.3 Motor Units........................................................................................................................ VII-4 2.4 Clutches and Solenoids .................................................................................................... VII-5 2.5 Sensors ............................................................................................................................. VII-6

3. DISASSEMBLY FLOW .................................................................................VII-7 4. DISASSEMBLY PROCEDURE.....................................................................VII-8
4.1 Right Side of the Printer .................................................................................................... VII-8 4.2 Top of the Printer ............................................................................................................ VII-17 4.3 Left Side of the Printer..................................................................................................... VII-26 4.4 Paper Exit Unit ................................................................................................................ VII-33 4.5 Front of the Printer .......................................................................................................... VII-38 4.6 Rear of the Printer........................................................................................................... VII-40 4.7 Fusing Unit ...................................................................................................................... VII-44

CHAPTER VIII TROUBLESHOOTING .........................................VIII-1
1. OUTLINE OF TROUBLESHOOTING ..........................................................VIII-2 2. OPERATOR CALL.......................................................................................VIII-3
2.1 Video Controller Mode...................................................................................................... VIII-3 2.2 Engine Controller Mode.................................................................................................... VIII-6

3. PAPER TRANSPORT ERROR....................................................................VIII-8
3.1 Feed Jam ......................................................................................................................... VIII-8 3.2 Inner Jam ......................................................................................................................... VIII-9 3.3 Outer Jam ........................................................................................................................ VIII-9 3.4 Others .............................................................................................................................. VIII-9

4. SERVICE CALL .........................................................................................VIII-10
4.1 Video Controller Mode.................................................................................................... VIII-11 4.2 Engine Controller Mode.................................................................................................. VIII-13

5. IMAGE FAILURE .......................................................................................VIII-41

APPENDIX A....................................................................................A-1

REGULATIONS
LASER SAFETY (FOR 110-120 V MODEL ONLY)
This printer is certified as a Class I laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that the printer does not produce hazardous laser radiation. Since radiation emitted inside the printer is completely confined within protective housings and external covers, the laser beam cannot escape from the machine during any phase of user operation.

FDA REGULATIONS (FOR 110-120 V MODEL ONLY)
U.S. Food and Drug Administration (FDA) has implemented regulations for laser products manufactured on and after August 2, 1976. Compliance is mandatory for products marketed in the United States. One of the following labels on the back of the printer indicates compliance with the FDA regulations and must be attached to laser products marketed in the United States. Caution Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure.

i

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 1LASER PRODUCT APPAREIL Å LASER DE CLASSE 1 LASER KLASSE 1 PRODUKT

This printer has a Class 3B Laser Diode which emits invisible laser radiation in the Scanner Unit. The Scanner Unit should not be opened under any circumstances. Caution Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure. The following caution label is attached near the scanner unit.

5mW 780nm-800nm
DANGERINVISIBLE LASER RADIATION WHEN OPEN. AVOID DIRECT EXPOSURE TO BEAM. LASERSTRAHLUNG, WENN ABDECKUNG GEÖFFNET UND SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN. RAYON LASER INVISIBLE LORS DE L'OUVER TURE. EVITER L'EXPOSITION DIRECTE. RADIACION LASER INVISIBLE AL ABRIR. EVITAR LA EXPOSICION DIRECTA AL HAZ.

VORSICHT- UNSICHTBARE DANGERPELIGRO-

MAS

For Finland and Sweden LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT Varoitus! Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle. Varning Om apparaten används på annat sätt än i denna Bruksanvisning specificerats, kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1.

ii

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 described in this manual. Follow all the cautions and warnings set out in the procedures and on safety labels affixed to the machine. Failure to do so may result in human injury or equipment damage. 3) Perform only the procedures explained in this manual. Refrain from opening or touching any portions that are not related to your required operation(s). 4) Repair and replacement of parts should be performed by trained and qualified persons only. Operators should not attempt to do such repair or replacement work. 5) It must be appreciated that the above-mentioned cautions and warnings do not cover everything because it is impossible to evaluate all the circumstances of repair situations.

SPECIAL SAFETY INFORMATION
Introductory Information Cautions and warnings are made clear by following the `Safety Alert Symbols' or `Signal Words' such as DANGER, WARNING and CAUTION. This is the safety alert. When you find this symbol placed on the equipment or marked in this manual, be aware of the potential of human injuries. Follow the recommended precautions and safety operation practices. DANGER is used to indicate the presence of a hazard which will cause severe human injuries or a fatal accident if the warning is ignored. WARNING is used to indicate the presence of a hazard or unsafe practices which may cause severe human injuries or a fatal accident if the warning is ignored. CAUTION is used to indicate the presence of a hazard or unsafe practices which may cause minor human injuries if the warning is ignored. CAUTION also calls your attention to safety messages in this manual. Carefully read all the safety messages set out in this manual and also in the safety warning signs placed on the equipment. In this manual, the safety instructions (safety alert symbols and signal words) are enclosed in a rectangular enclosure to bring them to your attention. Keep the safety signs on the equipment in good condition and ensure none are missing or damaged. Replace the safety signs if unreadable or damaged. Learn how to operate the equipment and how to use the controls properly. Do not let anyone operate this equipment without following the instructions. Keep the equipment in proper working condition. Unauthorized modification to the equipment may impair the function & safety and affect the life of the equipment. Listed below are the various kinds of "WARNING" messages contained in this manual.

iii

WARNING HAZARDOUS VOLTAGE
May cause serious injuries or fatal accidents. Voltage is now applied from the power supply of printer. There is a danger of electrical shock if you touch the active area inside the printer. Be sure to turn the power supply switch OFF and pull the plug out from the power outlet before starting maintenance work on the printer.

WARNING HARMFUL OZONE GAS
Inhalation of an excessive amount of ozone gas may adversely affect the respiratory organs. An Ozone Filter is fitted to this printer to reduce the exhausted ozone. This filter must be replaced with a new filter periodically in accordance with the manual supplied with the printer.

WARNING HOT SURFACE
The Fusing Unit reaches a temperature of approx.160°C and adjacent parts are also very hot. When you need to change the cleaning pad or remove jammed paper, wait about 20 minutes after opening the paper exit unit to allow the unit to cool down.

CAUTION ROTATING PARTS
Be aware of the potential danger of various rollers and take care not to get your fingers or hand caught into the machine, this can cause serious injuries. Note that the exit roller that ejects the printed paper is rotating while printing. Be careful not to get your hair, fingers, hands, sleeve or necktie caught in the machine while operating the machine.

iv

CAUTION HAZARDOUS POWDER
Toner is a fine powder which can cause a powder explosion if disposed of into a fire. Under no circumstances dispose of toner into a fire.

CAUTION HAZARDOUS POWDER
Toner is a fine powder which may cause irritation to the eyes and respiratory organs if inhaled. Handle the toner cartridge, waste toner pack and developing unit carefully so as not to spill the toner.

CAUTION POWER CORDS & PLUGS
This printer is equipped with a 3-wire power cord fitted with a 3-pronged plug (bi-polar plug with grounding) for the user's safety. Use these power cords in conjunction with a properly grounded electrical outlet to avoid an electrical shock.

CAUTION SAFETY INTERLOCK
The front cover, paper exit unit and transfer unit of this printer have electrical safety interlocks to turn the power off whenever they are opened. Do not attempt to circumvent these safety interlocks.

v

1

3

2
1. Hot Caution Label
WARNING Hot surface. Avoid contact. WARNUNG Heiße oberfiäche. Bei beseitigung. AVERTISSEMENT Surface chaude. Eviter tout contact.

2. Laser Caution Label
5mW 780nm-800nm
DANGERINVISIBLE LASER RADIATION WHEN OPEN. AVOID DIRECT EXPOSURE TO BEAM. LASERSTRAHLUNG, WENN ABDECKUNG GEÖFFNET UND SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN. RAYON LASER INVISIBLE LORS DE L'OUVER TURE. EVITER L'EXPOSITION DIRECTE. RADIACION LASER INVISIBLE AL ABRIR. EVITAR LA EXPOSICION DIRECTA AL HAZ.

VORSICHT- UNSICHTBARE DANGERPELIGRO-

MAS

3. Rating Label

(For US)
CLASS 1 LASER PRODUCT APPAREIL Å LASER DE CLASSE 1

MODEL HL-C1
SER. NO.

LASER KLASSE 1 PRODUKT

U52492L7H111101
120V ~ 50/60Hz 8.0A BROTHER INDUSTRIES, LTD.

MANUFACTURED;

NOVEMBER 1997

HTJ

BROTHER INDUSTRIES, LTD.
15-1, Naeshiro - cho, Mizuho - ku, Nagoya 467, Japan. This product complies with FDA radiation performance standards, 21 CFR Subchapter J.

MADE IN JAPAN

FCC ID : B3QHLC1
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions : (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

BROTHER PRINTER HL SERIES COVERED BY ONE OR MORE FOLLOWING PATENTS:
USP4, 968, 159 USP5, 050, 228 USP5, 068, 805 USP5, 086, 481 USP5, 093, 904 USP5, 126, 788

(For Europe)
TOV
ProductSafety

CLASS 1 LASER PRODUCT APPAREIL Å LASER DE CLASSE 1 LASER KLASSE 1 PRODUKT

MODEL HL-C1
SER. NO.

E 5 2 6 1 9 L 7 H 1 1 1 1 0 1
220V-240V~ 50/60Hz 4.0A BROTHER INDUSTRIES, LTD.

ACN

001

393

835

MADE IN JAPAN

vi

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.

CAUTION
· When shipping the printer, remove the toner cartridges, the OPC belt cartridge and the waste toner pack from the printer to prevent toner spill in the printer or damage of the toner cartridge and the OPC belt cartridge. · 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 the fusing unit with the supplied syringe. Failure to do so will cause severe damage to the printer.

vii

CHAPTER I
PRODUCT OUTLINE

CONTENTS
CHAPTER I PRODUCT OUTLINE................................................... I-1
1. FEATURES..................................................................................................... I-1 2. PARTS NAMES & FUNCTIONS ..................................................................... I-4 3. INTERNAL STRUCTURE ............................................................................... I-6 4. DESCRIPTION OF CONTROL PANEL .......................................................... I-7
4.1 Video Controller Mode ...........................................................................................................I-7 4.2 Engine Controller Mode .........................................................................................................I-7

CHAPTER I 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 provides higher quality printout which is the equivalent of 2400 x 600 dpi resolution when using HRC or CAPT. High Speed Color Laser Printing The printer allows crisp printing in 24 bit brilliant color. The printer prints at a speed of 16 pages per minute in monochrome mode and 4 pages per minute in full color mode. The controller utilizes a high speed 32-bit RISC microprocessor and special hardware chips, which provides a very fast processing speed. High Resolution Control (HRC) The high resolution control (HRC) technology provides clear and crisp printouts and improves even the 600 dpi resolution. This mode is effective when printing text data. Color Advanced Photoscale Technology (CAPT) The printer can print graphics in 256 shades for each color in HP® color printer PCL5CTM and BR-Script level 2 emulations, producing nearly photographic quality. This mode is effective when printing photographic images. Maintenance-Free Toner Cartridge A toner cartridge can print up to 10,000 (Black) and 6,000 (Cyan, Magenta and Yellow) single-sided pages at 5% coverage. The one piece, easy-to-replace toner cartridges do not require difficult maintenance. Universal Media Cassette This printer loads paper automatically from the media cassette. Since the media cassette is a universal type, a number of different sizes of paper can be used. Even envelopes can be loaded from the media cassette. Three Interfaces This printer has a high speed IEEE 1284 compliant bi-directional parallel interface, an RS-232C serial interface, and a modular input/output (MIO) compatible interface. If the application software supports the bi-directional parallel interface, you can monitor the printer status. It is fully compatible with the industry-standard IEEE 1284 bi-directional parallel interface. The RS-232C serial interface is an industry standard so that you can connect it to any computer using a standard serial cable. The MIO interface allows you to install a commercial MIO-compatible card. If the card is installed, this interface port can be used for features such as networking or printer sharing.

I-1

Automatic Interface Selection The printer can automatically select the bi-directional parallel, RS232C serial, or MIO interface depending on the interface port through which it receives data. With this feature, the printer can be connected to more than one computer. Five Emulation Modes The printer can emulate Hewlett-Packard Color PCL 5C (PCL6 in ® monochrome mode) and PostScript Level 2 language emulation (Brother BR-Script Level 2) printers, the industry-standard HP-GLTM ® ® ® plotter as well as EPSON FX-850TM, and IBM Proprinter XL printers (in monochrome mode). It is possible to print with all application 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 Technology The printer can internally compress the received graphics and font data in its memory so that it can print larger graphics and more fonts without additional memory. Various Fonts The printer has 75 scalable fonts and 12 bitmapped fonts The fonts that can be used vary according to the current emulation mode. CCITT G3/G4 Since the printer supports the CCITT G3/G4 format in addition to HPcompatible formats, it can quickly receive and print data compressed in this format. Lock Panel If the panel button settings have been changed, the printer may not work as expected. It is possible for the administrator of the printer to lock the settings to prevent changes from being made. Power Save Mode The printer has a power saving mode. As laser printers consume power to keep the fixing assembly at a high temperature, this feature can save electricity when the printer is on but not being used. The factory setting of the Power Save mode is ON so that it complies with the EPA Energy Star new specification. Compared with conventional laser printers, this printer consumes less power even when the power saving mode is turned off. 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 print job without sending the data again from the computer. When there is not enough memory to print the last complete job out, the last print page can be reprinted.
® ®

I-2

PCMCIA Card Slot The printer has two PCMCIA card slots (Type II cards: 2 slots available, Type III cards: 1 slot available). The following cards can be installed; · PCMCIA-compatible flash memory card · HDD card · PCMCIA Fax Modem card Saving User Settings It is possible to operate the printer differently from other users with the panel button settings. Two sets of user settings can be stored.

I-3

2.

PARTS NAMES & FUNCTIONS
1. Top Cover 2. Control Panel

4. Power Button 3. Front Cover

Media cassette

Fig.1-1

7. Controller Box

5. Power Inlet 6. Rear Access Cover

Fig.1-2

I-4

No. 1

Part Name Top 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 operation.

3

Front Cover

To act as a front enclosure, opened when replacing a toner cartridge or waste toner pack.

4

Power Button

To operate power-on and off to the printer. (Push for On/Off operation)

5

Power Inlet

To connect a power supply cable.

6

Rear Access Cover

To act as a rear enclosure, opened when clearing an internal jam or doing maintenance work.

7

Controller Box

Space where the main (video controller) PCB is installed.

I-5

3.

INTERNAL STRUCTURE

4.Fusing Unit 3.Drum Cleaner 2.OPC Belt Cartridge

1.Toner Cartridge (K,Y,M,C)

K Y M C

5.Transfer Unit 7.Paper Discharger 8.Transfer Roller 6.Transfer Drum 12.Register Roller 10.Paper Pickup Roller
Fig.1-3

11.Scanner Unit 9.Media Cassette

No. 1 2 3 4 5 6 7 8 9 10 11 12

Components Name Toner Cartridge OPC Belt Cartridge Drum Cleaner Fusing Unit Transfer unit Transfer Drum Paper Discharger Transfer Roller Media Cassette Paper Pick-up Roller Scanner Unit Register roller

Outline of Functions Contain the toner (K, Y, M, C) for developing. Each toner cartridge (K, Y, M, C) is independent. Forms images and includes the photoconductive belt. Cleans and collects waste toner adhering to the transfer drum. Fixes by heat and pressure the toner image onto the paper. Transfers toner images from the transfer drum to the paper. Forms color images, combining the toner images from the OPC belt on the drum. Emits a corona charge for separating the paper from the transfer drum. Transfer the toner image on the transfer drum to the paper. Feeds paper automatically. Feeds paper automatically from the paper cassette. Generates a laser beam and scans the OPC belt. Aligns the paper correctly ready for printing

I-6

4.

DESCRIPTION OF CONTROL PANEL
The printer control panel provides control of the printer including test printing, maintenance operations performed by the video controller and also the ones which are performed by the engine controller. The Video Controller Mode and the Engine Controller Mode have some common functions. Under normal circumstances the functions in the Video controller mode will be used. Refer to Chapter V for further information.

4.1

Video Controller Mode The printer goes into the Video Controller Mode when the power is turned on by pressing the power button. The Video Controller Mode supplies the general test printing and setting functions and some of the maintenance operations. If further engine settings are required, use the Engine Controller Mode.

4.2

Engine Controller Mode The printer goes into the Engine Controller Mode when power is turned on by pressing the power button at the same time as holding down the Mode, Set and w buttons. (Refer to Fig.1-4.)

Note: This mode provides unique control panel display and operation functions which are completely different from the ones described on the actual control panel or in the user's guide. Refer to Chapter V for detailed information.

I-7

Copy Pages Orientation Feeder

1

Emulation Mode

Toner

K

C

M

Y

3 2 5 7 8
Ready On Line Sel Data Form Feed

4 6 9
10

Alarm Mode Font

Feeder

Emulation

Economy
Set

Test

12 13

11

Continue

Shift

Copy

Reset

Fig.1-4

No. 1 2 3 4 5 6 7 8 9 10 11 12 13

LED / Button Name LCD: 16 character by 2 lines Ready LED On Line LED Data LED Select button Form Feed / Feeder button Alarm LED Mode / Emulation button Font / Economy button v / Test button Continue / Shift button Set / Copy button w / Reset button

I-8

CHAPTER II
SPECIFICATIONS

CONTENTS
CHAPTER II SPECIFICATIONS ..................................................... II-1
1. RATING ......................................................................................................... II-1 2. GENERAL SPECIFICATIONS ....................................................................... II-2
2.1. Printing.................................................................................................................................II-2 2.2. Functions .............................................................................................................................II-3 2.3. Electrical and Mechanical ....................................................................................................II-3 2.4. Paper Specification..............................................................................................................II-4 2.4.1 Printable Media & Cassette Capacity ............................................................................II-4 2.4.2 Printed Output ................................................................................................................II-5 2.4.3 Recommended Paper Specifications.............................................................................II-5 2.4.4 Effective Printing Area....................................................................................................II-5 2.4.5 Paper Feed Jam Rate....................................................................................................II-7

3. ENVIRONMENTAL CONDITION ................................................................... II-8
3.1 Ambient Temperature / Humidity / Altitude...........................................................................II-8

CHAPTER II
1. RATING

SPECIFICATIONS

WARNING
Use the power supply cable supplied with the printer, or a similar cable complying with the following specification (3-wire power cable with ground). Use of an "out of specification" cable may result in an electric shock.

Destination US / Canada Europe *

Voltage (V) 120 220 - 240

Frequency (Hz) 50/60 50/60

Input Current (A) 8 4

Power Cord (Piece) 1 1*

For the model for Europe, the power supply cable depends on the country as follows; Figure A B Rating 250VAC, 6A Approval Agency VDE, DEMKO, SEV BS Applicable Area Europe (Continent) UK

Figure A: For Europe (Sample)

2.5m

Figure B: For UK

2.5m

Note: For details of other power supply cables, refer to the parts reference list.
** For rating labels, refer to the Safety Instruction on Page vi.

II-1

2.
2.1.

GENERAL SPECIFICATIONS
Printing Print method: Resolution: Electrophotography by semiconductor laser beam scanning 300 x 300 dots per inch (Normal) 600 x 600 dots per inch (Fine) The resolution can be enhanced to 2400 dpi class by using the HRC(High Resolution Control) and CAPT (Color Advanced Photoscale Technology) features. Monochrome mode: Full color mode: 16 page/minute (A4/Letter-size) 4 page/minute (A4/Letter-size)

Print speed:

Warm-up: First print:

Max. 3 minute at 20°C (68°F) Monochrome mode: 19 seconds or less Full color mode: 30 seconds or less (when loading A4/Letter-size paper by face down print delivery from standard upper cassette feed)

Print media:

Note:

Toner in a single-color single-component cartridge Life Expectancy: 10,000 single-sided pages/cartridge (Black) 6,000 single-sided pages/cartridge (Cyan, Magenta, Yellow) These figures are based on an average of 5% coverage of the printable area for one color using laser paper. The frequency of replacement will vary, depending on the complexity of the prints, the percentage of coverage, and the type of media. Transparencies, glossy coated paper and other special media will result in shortened consumable life.

Resident Printer Fonts: 66 scalable fonts and 12 bitmapped fonts 66 scalable fonts

II-2

2.2.

Functions CPU: Emulation: MB86832 (SPARC architecture) Automatic emulation selection HP Color Printer (PCL5C) including HP LaserJet 4+ (PCL5e) and HP LaserJet 5 (PCL6 monochrome) BR-Script Level 2 (Adobe PostScript Level 2 compatible) HP-GL EPSON FX-850 IBM Proprinter XL Interface: Automatic interface selection between the bi-directional parallel, RS232C serial and MIO interface. Standard model: 16Mbytes Network model: 32Mbytes (Expandable up to 112Mbytes with SIMMs) The standard memory fitted can vary depending on the printer model and country

RAM:

Card Slots: 2 card slots: PCMCIA Type I, II 1 card slot: PCMCIA Type III Compatible for Flash Memory or HDD cards Control panel: 8 buttons, 4 LEDs and a 16-column x 2 lines liquid crystal display Diagnostics: 2.3. Self-diagnostic program

Electrical and Mechanical Power source: U.S.A. and Canada: AC 120V, 50/60Hz Europe and Australia: AC 220 to 240V, 50/60Hz Power consumption: Printing: Standing by: Sleep: Noise: Printing: Standing by:

450W or less 150W or less 25W or less 55dB A or less 48dB A or less 10 to 32.5°C (50 to 90.5°F) 5 to 35°C (41 to 95°F) 0 to 35°C (38 to 95°F)

Temperature:

Operating: Non Operating: Storage: Operating: Storage:

Humidity:

20 to 80% (non condensation) 20 to 80% (non condensation)

Dimensions (W x D x H): 500 x 490 x 388 mm (19.7 x 19.3 x 15.3 inches) 500 x 490 x 493 mm (19.7 x 19.3 x 19.4 inches) with the optional lower tray unit fitted Weight: Approx. 32kg (70.5lbs.) Approx. 36kg (79.4lbs.) with the optional lower tray unit and toner cartridges fitted

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2.4. 2.4.1

Paper Specification Printable Media & Cassette Capacity The standard media cassette (upper cassette) is supplied with the printer. The optional lower tray unit and the optional Legal cassette can also be installed.

Note: The standard cassettes (including the optional lower tray unit) and the optional Legal cassette are interchangeable between the upper and the lower feeder.

1) Printable Media: 2) Printable size: 4) Maximum load height :

Plain paper / Envelope / Transparency / Label (Refer to the list below.) 27mm · Plain paper: · Envelopes : · Label: 250 sheets of 75g/m2 (20lb) paper 15 sheets 80 sheets

3) Feedable paper weight: 60 (16lb.) to 160 (43lb.) g/m2

· Transparency: 50 sheets 5) Setting method: Pull the media cassette out of the printer toward you, insert the paper into the cassette after aligning the top edge of the sheets, then push the cassette back into its original position.

Paper Source The Standard Media Cassette (Upper/Lower feeder) Plain paper: Envelope: Other size: Plain paper: Envelope: Other size:

The Optional Legal Cassette

Printable Media Size A4, Letter, B5, Executive COM10, DL width 105-216mm (4.1"-8.5") length 220-297mm (8.7"-11.7") Legal, A4, Letter, B5, Executive COM10, DL width 105-216mm (4.1"-8.5") length 220-355.6mm (8.7"-14")

105 to 216 mm

Feeding direction (face up)

220 to 297mm (Standard Cassette) 220 to 355.6 mm (Legal Cassette)

II-4

2.4.2

Printed Output 250 sheets of 75g/m2 (20lb) paper / plain paper can be stacked in the output tray. Face-down print delivery Note: Face down: Delivers the printed side of the paper downwards Environment: 17.5 27.0°C, 50 70%RH

2.4.3

Recommended Paper Specifications Item Basis Weight (g/m ) Thickness (µ m) Smoothness (Bekk) (seconds) Stiffness (Clark) Brightness (%) Surface Resistance () Grain Direction Measurement Condition:
2

Description 82 ± 5 95 ± 6 90 ± 20 100 ± 15 85 ± 2 10 ~ 10 Long 17.5 ~ 27.0°C, 50 ~ 70%RH
10 11

Note:

Keep the paper sealed in the bag as supplied and do not open the paper bag until the paper is required for use.

2.4.4

Effective Printing Area (1) Printable area
A C E

F E

B

D

F

The effective printing area means the area within which the printing of all the data received without any omissions can be guaranteed. (Refer to Table 2-1 for details.)

II-5

Table 2-1: Effective Printing Areas A 210.0mm A4 8.27" (2,480 dots) 215.9mm Letter 8.5" (2,550 dots) 215.9mm Legal 8.5" (2,550 dots) 182.0mm B 5 (JIS) 7.16" (2,149 dots) 176.0mm B 5 (ISO) 6.93" (2,078 dots) 184.2mm Executive 7.25" (2,175 dots) 104.8mm COM-10 4.125" (1,237 dots) 110.1mm DL 4.33" (1,299 dots) Size B 297.0mm 11.69" (3,507 dots) 279.4mm 11.0" (3,300 dots) 355.6mm 14.0" (4,200 dots) 257.0mm 10.12" (3,035 dots) 250.0mm 9.84" (2,952 dots) 266.7mm 10.5" (3,150 dots) 241.3mm 9.5" (2,850 dots) 221mm 8.66" (2,598 dots) C 203.2mm 8.0" (2,400 dots) 207.44mm 8.16" (2,450 dots) 207.44mm 8.16" (2,450 dots) 173.54mm 6.82" (2,049 dots) 167.54mm 6.59" (1,978 dots) 175.74mm 6.91" (2,075 dots) 96.34mm 3.785" (1,137 dots) 101.64mm 3.99" (1,199 dots) D 288.5mm 11.36" (3,407 dots) 271.0mm 10.67" (3,200 dots) 347.1mm 13.67" (4,100 dots) 248.5mm 9.78" (2,935 dots) 241.5mm 9.5" (2,852 dots) 258.3mm 10.17" (3,050 dots) 232.8mm 9.16" (2,750 dots) 211.5mm 8.33" (2,498 dots) E 3.4mm 0.13" (40 dots) 4.23mm 0.17" (50 dots) F 4.23mm 0.17" (50 dots)

(Note that the 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.

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(2)

Print guarantee area

4mm

Paper:5mm Other:10mm

Non printable area Print guarantee area Non guarantee area

4mm 3mm 5mm 3mm 5mm

Paper:4mm Other:10mm

Non printable area Non guarantee area

42mm

3mm

Print guarantee area

16mm 4mm 4mm

COM10:68mm DL:40mm

COM10:68mm DL:40mm

2.4.5

Paper Feed Jam Rate Less than 1 misfeed per 2000 pages under normal environmental conditions. Less than 1 misfeed per 1000 pages outside the normal environmental conditions.

Note: These figures are based on the paper whose specification is recommended. For the recommended specifications, refer to Section 2.4.3 of this chapter.

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3.
3.1

ENVIRONMENTAL CONDITION
Ambient Temperature / Humidity / Altitude (1) Under Operational conditions: 10.0 32.5°C, 20 80%RH (See the figure below.)

80

Humidity (%RH)

70 60 50 40
Recommended Condition; 17.5 27.0°C 50 70%RH

Ambien

20

0

10 17.5 20 27 30 Ambient Temperature ( C)

32.5 40

(2)

Under Non Operational conditions: 5.0 35.0°C, 10 80%RH (See the figure below.)

80

Ambient Humidity (%RH)

60

40 30 20 10 0 5 10 20 Ambient Temperature( C ) 30 35 40

II-8

(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 and toner cartridges. Normal Conditions Temperature Humidity Period of Storage Other Atmosphere Severe Conditions 0°C 35°C (35°F 95°F) High Temperature: 35°C 40°C (95°F 104°F) Low Temperature: -10°C 0°C (14°F 32°F) 10% 90%RH One Year No Condensation 613 1,067hpa (460 880mmHg)

The period under the severe conditions should not be continuous, and is assumed as an accumulation of intermittent time. However, an individual period of intermittent time under severe conditions should not be allowed to exceed 48 hours.

Note: Normal conditions should occupy more than 90% of total storage period. Severe conditions should be less than 10% of total storage period.

II-9

CHAPTER III
INSTALLATION

CONTENTS
CHAPTER III INSTALLATION ....................................................... III-1
1. CONDITIONS REQUIRED FOR INSTALLATION......................................... III-1
1.1. Environmental Conditions...................................................................................................III-1 1.2. Basic Layout of Printer Set-up Location .............................................................................III-1

2. UNPACKING................................................................................................. III-2
2.1 Unpacking of Printer ............................................................................................................III-2 2.2 Unpack the Starter Kit..........................................................................................................III-4

3. INSTALLATION WORK ................................................................................ III-5
3.1 Install the OPC Belt Cartridge..............................................................................................III-5 3.2 Install the Toner Cartridge to the Printer..............................................................................III-6 3.3 Install the Oil Bottle and Fuser Cleaner ...............................................................................III-7 3.4 Test Print .............................................................................................................................III-8 3.4.1 Test Print.......................................................................................................................III-8 3.4.2 On-line Printing (Video Controller Mode only).............................................................III-10

CHAPTER III INSTALLATION
1. CONDITIONS REQUIRED FOR INSTALLATION
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 factors should be taken into consideration before deciding where to set-up the printer. 1.1. Environmental Conditions The printer should not be set up in the locations referred to in the following items (a) through (d) which specify inappropriate locations for set-up. (a) Where it is likely to receive direct sunlight or similar light. (For example, next to a window) (b) Where it is likely to suffer a big difference in temperature and humidity between the maximum and minimum levels. (Normal operation environment is within 10°C 32.5°C, 20 80%RH and without any condensation.) (c) Where it is likely to be in a draft of cold air from an air-conditioner or warm air from a heater, or to receive direct radiant heat. (d) Where it is likely to be excessively dusty or be subject to corrosive gases such as ammonia. (e) Users should select a location with good ventilation and set the printer on a flat surface. (f) Users should check that the maximum angle of the set-up location is horizontal to within ±1°. 1.2. Basic Layout of Printer Set-up Location Fig.3-1 shows the basic layout of the printer set-up location that is suitable for smooth operation and maintenance of the printer.

10cm(4")

40cm(16")

70cm(28")

Paper Exit Side

10cm(4")

Fig.3-1

· · ·

The space in front of the printer (70cm) is necessary to open the front cover. The space at back of the printer (40cm) is necessary to open / close the rear access cover. The space on both sides of the printer (10cm) is necessary for general access.

III-1

Front Side

2.

UNPACKING

WARNING
· The package containing a printer weighs approximately 40kg (80lbs), so it is too heavy for one person to carry. It needs two adults to move the printer. Since the printer is a precision machine, make sure that it is carried slowly with care so that no impact occurs to the printer while moving it. Do not attempt to lift a printer when it is covered by the vinyl bag because it is slippery and may result in damage and injury if dropped.

·

2.1

Unpacking the Printer Refer to Fig.3-2 on the next page. 1) 2) 3) 4) 5) 6) 7) 8) 9) Remove the binding tape from the top of the package. Open the top of the package and take the starter kit out. Remove the upper packing. Take the customize kit** out. Remove the plastic joints (4 locations). Lift the outer box up from around the printer. Take the power cable. (for US / Canada only). Open up the vinyl bag enclosing the printer. Lift up the printer with another person's help, and move it away from the vinyl bag.

10) Set up the printer in a suitable location. ** For USA/Canada, it contains the user's guide and printer driver disks. For other countries, it contains the user's guide, printer driver disks and the power cable.

III-2

Starter Kit Packing (U)

Outer Box Polyethylene Bag (T) Polyethylene Bag (OPC) Polyethylene Bag (ST) Polyethylene Bag (OIL) Starter Kit Packing (L) Silica Gel (EN) Upper Packing
Power Cord

Polyethylene Bag (CL)

III-3
Costomize Kit Polyethylene Bag (EN)

Silica Gel (ST)
Syringe

Outer Box Tape

Cleaning Brush

Joint Base

Fig.3-2

2.2

Unpack the Starter Kit 1) 2) Open the vinyl bag and slide off the cardboard sleeve covering the starter kit. Confirm all of the following parts are inside the starter kit packing box. Kit Name Appearance Y (Yellow) M (Magenta) C (Cyan) K (Black) Quantity

No.

1

Toner Cartridge (Y,M,C,K)

4

2

OPC Belt Cartridge

1

3

Oil Bottle

1

4

Fuser Cleaner

1

5

Syringe

1

PRECAUTION
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 the fusing unit with the supplied syringe. Failure to do so will cause severe damage to the printer.

III-4

3.

INSTALLATION WORK
Install the unit parts of the starter kit into the printer according to the following procedures:

3.1

Install the OPC Belt Cartridge

PRECAUTION
· Do not directly touch the OPC belt surface with bare hands or gloves.

· If the belt is exposed for more than two minutes to a light source of 800 lux, the belt may be damaged.

1) Open the front cover and the top cover by releasing the latches.

Top Cover

CAUTION
When installing or removing the OPC belt, be sure to open the front cover first. Failure to do so will cause the OPC belt to be damaged due to contact with the toner cartridges.
Front Cover Fig.3-3

2) Release the belt cartridge lock levers (left & right).
Belt cartridge lock lever (Left)

Belt cartridge lock lever (Right) Fig.3-4

3) Pull and remove the tension release pins on both sides (left & right) of the OPC belt cartridge. 4) Remove the protective sheet from the new OPC belt cartridge.
Tension release pin

OPC Belt Cartridge

Protective sheet Tension release pin Fig.3-5

III-5

5) Install the new OPC belt cartridge into the guides at both sides in the printer.

Fig.3-6

6) Set the belt cartridge lock lever at both sides (left and right).

Fig.3-7

3.2

Install the Toner Cartridges into the Printer 1) Rock each of the cartridges 3 to 4 times through 30o to the horizontal. 30o

30o
Fig.3-8

2) Remove the tape fixing the protective cover and remove the protective cover from the new toner cartridge.

Protective cover

3) Install the new toner cartridge along the guide into the printer.

Fig.3-9

Fig.3-10

III-6

Note: The installation order of the four toner cartridges should be from the bottom to the top, in terms of colors this is in the order Cyan (C), Magenta (M), Yellow (Y), and Black (K). 4) Close the front cover.
K Y M C

Fig.3-11

3.3

Install the Oil Bottle and Fuser Cleaner 1) Pull out and remove the orange protective parts fitted between the rollers of the fusing unit.
Orange protective part

Fig.3-12

2) Install the oil bottle into the fusing unit.
Oil Bottle

Fig.3-13

3) Install the fuser cleaner into the fusing unit. 4) Secure the oil bottle and the fuser cleaner with the retainer lock levers. 5) Close the top cover.

Fuser Cleaner Retainer lock lever

Fig.3-14

III-7

3.4

Test Print After completing the installation work, perform a test print. The test print should be done in the Video Controller Mode and 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 necessary.

Note: The test print pattern differs between these two modes.
3.4.1 Test Print 1) Before connecting a power cable to the printer, ensure that the power button located on the front of the printer projects from the cover surface. This means that the printer is in the power-off status.
Power Button

2) Connect the connector of the power cable to the printer.

3) Insert the plug of the power cable into the power outlet.

4) Press the power button, and confirm that the SELF TEST LCD panel screen is displayed during printer initialization.

04

SELF TEST

The printer checks the RAM size and then goes into warming-up mode. 5) The Ready LED lights within 210 seconds maximum, before which the screen shown on the right appears on the control panel display. 6) Press the Select button to set the printer off-line.

RAM SIZE = 16 M

LJ WAIT 001P T1 AUTO

7) Hold down the Shift button and press the Test button so that the printer enters the test mode. 8) The printer has built-in print patterns for test printing. The display shows the first test mode item. 9) Press the v or w button until the desired test mode appears on the display, then press the SET button to print the desired test page.

III-8

Note: Refer to the table below for each test mode item.
Display Message Test Mode Description Prints out the demonstration. Performs the printer test and prints out the test pattern. Prints out a list of panel button settings you have configured as user settings for the printer. Prints out a list of internal or resident fonts. Prints out a list of optional fonts stored in the font cartridge/card. Prints out a list of permanent download fonts. Exits from the test mode. The printer does not perform any test.

DEMO PAGE TEST PRINT PRINT CONFIG PRINT FONTS I PRINT FONTS C PRINT FONTS P exit

10) Push the power button in order to shut off the power supply to the printer.

Note: use the following procedures to identify the problem if the test print is incorrect.
11) Press and hold down the Mode, Set and w buttons and press the power button to go into the Engine Controller Mode. The Ready LED lights within 210 seconds maximum, when the screen (a) on the right appears on the control panel display. 12) Press the Select key, then the screen (b) on the right appears on the control panel display. (a)

00 U:[

READY ] L:[

[ ] [

] ]

(b)

SERVICE MODE TEST PRINT/NEXT

13) The printer has two built-in print patterns for test printing in the Engine Controller Mode as follows. Use the Set or w button to scroll through the menu options and then press the Continue key to perform the selected test print. Press Font to stop the test print. 1. Grid Pattern: Available in mono color print of Y, M, C, K, and two color print of R, G, B. 2. Stripe Pattern: Available in color print of Y, M, C, K, R, G, B.

Grid

Stripe

III-9

14) Press the Font button to stop the test print and then push the power button in order to shut off the power supply to the printer. (This switch is push-on/push-off type.)
Power Button

15) Unplug the power cable from the outlet.

PRECAUTION
· · · Before unplugging the power cable, confirm that the main power button located on the front of the printer is set to Off. Under no circumstances power off or unplug the printer while it is performing any printing operations. Do not turn the printer power back on until at least 5 seconds after powering off.

3.4.2 On-line Printing (Video Controller Mode only) Upon confirmation of correct printing by the test print modes, proceed with normal OnLine 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-Line Printing. 1) Connect the interface cable to the host computer. 2) Push the power button to turn on the printer.

Power Button

3) Confirm that the printer is set to the OnLine mode. (On Line LED is lit.) 4) Upon completion of the warming-up process, the Ready LED lights. This warming-up process takes 210 seconds maximum.

** Confirm what is indicated on the control panel.

LJ WAIT 001P T1 AUTO

5) The printer starts printing upon receipt of print data transmitted from the host PC.

III-10

CHAPTER IV
STRUCTURE OF SYSTEM COMPONENTS

CONTENTS
CHAPTER IV STRUCTURE OF SYSTEM COMPONENTS........... IV-1
1. BASIC STRUCTURE .................................................................................IV-1
1.1 Print System and Transfer System ................................................................................. IV-6 1.1.1 Structure of the Printer ............................................................................................. IV-7 1.1.2 Basic Structure of the Printing System..................................................................... IV-8 1.1.3 Details of Each Process ......................................................................................... IV-10 1.2 Scanning System .......................................................................................................... IV-21 1.3 Paper Transportation System ....................................................................................... IV-23 1.4 Fusing Unit .................................................................................................................... IV-25

2. STRUCTURE OF THE CONTROL SYSTEM...........................................IV-27
2.1 Basic Structure.............................................................................................................. IV-27 2.1.1 Electrical System and Functions ............................................................................ IV-27 2.2 Control System.............................................................................................................. IV-36 2.2.1 Control of the Print Process ................................................................................... IV-36 2.3 Main PCB (Video Controller PCB) .................................................................................IV-46 2.3.1 Outline .................................................................................................................... IV-46 2.3.2 Circuit ..................................................................................................................... IV-47 2.4 Power Supply Unit......................................................................................................... IV-58 2.5 High Voltage Power Supply Unit ................................................................................... IV-61 2.6 Wiring Diagram ............................................................................................................. IV-64

CHAPTER IV STRUCTURE OF SYSTEM COMPONENTS
1. BASIC STRUCTURE
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 printing through the interactive operations of these five systems as shown in Fig.4-1. (1) Print System The print system consists of the following 6 (six) functional parts located around the OPC belt which form a toner image on the OPC Belt. · Charger Part · Exposure Part · Development Part · First Transfer Part · Discharger Part · Cleaner Part (2) Scanning System The scanning system consists of the following 2 (two) functional parts which form an electrostatic latent image on the OPC Belt by scanning it with a laser beam. Scanner Unit Scanner Motor (SCM) (3) Transfer System The transfer system consists of the following 3 (three) functional parts and transfers the toner image formed on the transfer drum onto the page. · Transfer Drum · Second Transfer Part · Drum Cleaner Unit (4) Paper Transport System The paper transport system consists of the following 5 (five) functional parts and picks up paper from the media cassette, separates the paper from the transfer drum and exits it from the printer body after fusing the toner image on the paper. · Media Cassette · Transport rollers · Paper Discharger · Fusing unit · Paper Exit

IV-1

Main Motor MM Develope Motor Paper Exit Unit Paper Exit Drum Cleaner Unit DM I/F Controller

Fusing Unit

Fix Drum Cleaning Operation OPC Belt Development K Y M C First Transfer Second Transfer Discharge Exposure Scanner Unit LD SCM

MCTL I/F Control Sequence Control Laser Control

Transfer Unit AC Discharger Unit Transfer Roller

Paper Discharger

Transfer Drum

IV-2

Registrater Roller Charge Paper Pick-up Roller Erase Lamp Cleaning Paper Feed Media Cassette DC Charger

Fig.4-1

(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 · Laser Control · Fusing Temperature Control · Interface Control

(1) Principle of Color Printing Color printing is made through the subtractive process by combining the three primary colors, yellow, magenta, and cyan. Fig.4-2 shows the three primary colors and subtractive process:

C GR BK M R Y
Y: Yellow M: Magenta C: Cyan R: Red GR: Green BL: Blue BK: Black

BL

Fig.4-2

(2)

Basic Color Printing Process (a) The printer has a Toner Cartridge of each color yellow, magenta, cyan and black as shown in Fig.4-3. (b) The toner image developed using the primary colors is transferred to the transfer drum for the printed color combination as shown in Fig.4-4 a . (c) The toner image formed on the transfer drum is transferred to the transported paper as shown in Fig.4-4 b . (d) The toner on the paper is fused by the thermal fixing unit to fix the toner image onto the paper as shown in Fig.4-4 c . Summarizing the above processes, a toner color layer is formed on the transported paper, and subsequently, the color image is made through the subtractive process.

IV-3

OPC Belt Toner Cartridge

Transfer Drum

K Y M C

Fig.4-3

Toner

a . First Transfer

a

MMM CC C Y Y CC Y Y Y Y Transfer Drum

b . Second Transfer

b

Y Y Y Y Y Y MMM C C C CC Paper

Red

Cyan C

Green GR

C . Fusing

C

R

Paper
Fig.4-4

IV-4

The OPC belt consists of a surface layer having a photoconductor (OPC