Text preview for : 1070sm.pdf part of Brother HL-1070 SERVICE MANUAL brother hl-1070
Back to : 1070sm.part1.rar | Home
R
LASER PRINTER
SERVICE MANUAL
MODEL:HL-1070
Apr. `98 54U012BE0
© Copyright Brother 1998 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 registerd 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 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-1070 laser printer. This manual consists of the following chapters:
CHAPTER I :
FEATURES AND SPECIFICATIONS Features, specifications, etc.
CHAPTER II : THEORY OF OPERATION Basic operation of the mechanical system, the electrical system and the electrical circuits, and their timing information. CHAPTER III : DISASSEMBLY AND REASSEMBLY Procedures for disassembling and reassembling the mechanical system. CHAPTER IV : MAINTENANCE AND TROUBLESHOOTING Reference values and adjustments, troubleshooting image defects, troubleshooting malfunctions, etc. APPENDICES :SERIAL NO. DESCRIPTIONS, CONNECTION DIAGRAMS, PCB CIRCUIT DIAGRAMS.
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 FEATURES AND SPECIFICATIONS............................................. I-1
1. FEATURES ......................................................................................................................... I-1 2. SPECIFICATIONS .............................................................................................................. I-3
2.1 Printing ........................................................................................................................................... I-3 2.2 Functions ....................................................................................................................................... I-3 2.3 Electrical and Mechanical .............................................................................................................. I-4 2.4 Paper Specification ........................................................................................................................ I-5 2.5 Print Delivery.................................................................................................................................. I-6 2.6 Paper ............................................................................................................................................. I-6 2.7 Effective Printing Area ................................................................................................................... I-7
3. SAFETY INFORMATION .................................................................................................... I-9
3.1 Laser Safety (110 - 120V Model only) ........................................................................................... I-9 3.2 FDA Regulations (110 - 120V Model only) .................................................................................... I-9 3.3 Caution for Laser Product (Warnhinweis für Laserdrucker)......................................................... I-10
CHAPTER II THEORY OF OPERATION........................................................... II-1
1. ELECTRONICS..................................................................................................................................... II-1 1.1 General Block Diagram................................................................................................................. II-1 1.2 Main PCB Block Diagram ............................................................................................................. II-2 1.3 Main PCB ...................................................................................................................................... II-3 1.3.1 CPU Core ....................................................................................................................... II-3 1.3.2 ASIC ............................................................................................................................... II-5 1.3.3 ROM ............................................................................................................................... II-7 1.3.4 Flash Memory ................................................................................................................. II-7 1.3.5 DRAM ............................................................................................................................. II-8 1.3.6 Optional RAM ................................................................................................................. II-9 1.3.7 Optional Serial I/O ........................................................................................................ II-10 1.3.8 EEPROM ...................................................................................................................... II-10 1.3.9 Reset Circuit ................................................................................................................. II-11 1.3.10 Parallel I/O .................................................................................................................. II-11 1.3.11 Engine I/O................................................................................................................... II-12 1.3.12 Paper Feed Motor Drive Circuit .................................................................................. II-14 1.3.13 USB I/O....................................................................................................................... II-14 1.4 Driver PCB .................................................................................................................................. II-14 1.5 SW Panel PCB............................................................................................................................ II-14 1.6 Power Supply .............................................................................................................................. II-15 1.6.1 Low-voltage Power Supply ........................................................................................... II-15 1.6.2 High-voltage Power Supply, SR PCB ........................................................................... II-16 2. MECHANICS....................................................................................................................................... II-17 2.1 Overview of Printing Mechanism ................................................................................................ II-17 2.2 Paper Transfer ............................................................................................................................ II-18 2.2.1 Paper Supply ................................................................................................................ II-18
i
2.2.2 Paper Registration ........................................................................................................ II-18 2.2.3 Paper Eject ................................................................................................................... II-19 2.3 Sensors....................................................................................................................................... II-20 2.3.1 Cover Sensor................................................................................................................ II-20 2.3.2 Toner Empty Sensor..................................................................................................... II-20 2.4 Drum Unit.................................................................................................................................... II-21 2.4.1 Photosensitive Drum..................................................................................................... II-21 2.4.2 Primary Charger ........................................................................................................... II-21 2.4.3 Developer Roller ........................................................................................................... II-21 2.4.4 Transfer Roller .............................................................................................................. II-21 2.4.5 Cleaner Roller............................................................................................................... II-21 2.4.6 Erase Lamp .................................................................................................................. II-21 2.5 Print Process............................................................................................................................... II-21 2.5.1 Charging ....................................................................................................................... II-21 2.5.2 Exposure Stage ............................................................................................................ II-22 2.5.3 Developing.................................................................................................................... II-23 2.5.4 Transfer ........................................................................................................................ II-23 2.5.5 Drum Cleaning Stage ................................................................................................... II-24 2.5.6 Erasing Stage ............................................................................................................... II-24 2.5.7 Fixing Stage.................................................................................................................. II-24
CHAPTER III DISASSEMBLY AND REASSEMBLY ...................................... III-1
1. SAFETY PRECAUTIONS.................................................................................................. III-1 2. DISASSEMBLY FLOW...................................................................................................... III-2 3. DISASSEMBLY PROCEDURE ......................................................................................... III-3
3.1 Drum Unit..................................................................................................................................... III-3 3.2 Output Tray ASSY ....................................................................................................................... III-3 3.3 Top Cover .................................................................................................................................... III-4 3.4 MP Sheet Feeder 1 ASSY ........................................................................................................... III-4 3.5 MP Sheet Feeder 2 ASSY ........................................................................................................... III-7 3.6 Under Shoot ASSY ...................................................................................................................... III-7 3.7 SR PCB / Relay PCB ................................................................................................................... III-9 3.8 Fixing Unit .................................................................................................................................. III-10 3.9 Scanner Unit .............................................................................................................................. III-12 3.10 Main PCB ASSY ...................................................................................................................... III-14 3.11 Base Plate ASSY ..................................................................................................................... III-15 3.12 Driver PCB ASSY .................................................................................................................... III-16 3.13 Low-voltage Power Supply PCB ASSY ................................................................................... III-17 3.14 High-voltage Power Supply PCB ASSY................................................................................... III-18 3.15 Fan Motor ASSY ...................................................................................................................... III-18 3.16 Drive Unit ................................................................................................................................. III-19 3.17 Main Motor ASSY..................................................................................................................... III-20 3.18 Gears and Solenoid ................................................................................................................. III-21 3.19 Paper Support.......................................................................................................................... III-23 3.20 Extension Support Wire ........................................................................................................... III-23
ii
4. PACKING ........................................................................................................................ III-24
CHAPTER IV MAINTENANCE AND TROUBLESHOOTING........................... IV-1
1. INTRODUCTION...............................................................................................................IV-1
1.1 Initial Check .................................................................................................................................IV-1 1.2 Basic Procedure...........................................................................................................................IV-2
2. CONSUMABLE PARTS ....................................................................................................IV-2
2.1 Drum Unit.....................................................................................................................................IV-2 2.2 Toner Cartridge............................................................................................................................IV-2 2.3 Periodical Replacement Parts......................................................................................................IV-3
3. IMAGE DEFECTS .............................................................................................................IV-4
3.1 Image Defect Examples ...............................................................................................................IV-4 3.2 Troubleshooting Image Defects ...................................................................................................IV-5 3.3 Location of High-voltage Contacts and Grounding Contacts .....................................................IV-19 3.4 Location of Feed Roller Shaft and Grounding Contacts ............................................................IV-20
4. PAPER JAM....................................................................................................................IV-21 5. TROUBLESHOOTING MALFUNCTIONS .......................................................................IV-22 6. INSPECTION MODE.......................................................................................................IV-27
6.1 Incorporated Inspection Modes..................................................................................................IV-27 6.2 Error Codes...............................................................................................................................IV-29
APPENDICES
1. Serial No. Descriptions ......................................................................................................A-1 2. Connection Diagram ..........................................................................................................A-2 3. Main PCB Circuit Diagram, (1/5)........................................................................................A-3 4. Main PCB Circuit Diagram, (2/5)........................................................................................A-4 5. Main PCB Circuit Diagram, (3/5)........................................................................................A-5 6. Main PCB Circuit Diagram, (4/5)........................................................................................A-6 7. Main PCB Circuit Diagram, (5/5)........................................................................................A-7 8. Driver PCB Circuit Diagram ...............................................................................................A-8 9. Switch Panel/Solenoid, Bin/Relay PCB Circuit Diagram ....................................................A-9 10. Low-voltage Power Supply PCB Circuit Diagram (110 - 240V) ........................................A-10 11. Low-voltage Power Supply PCB Circuit Diagram (220 - 240V) ........................................A-11 12. High-voltage Power Supply PCB Circuit Diagram ............................................................A-12 13. SR PCB Circuit Diagram ..................................................................................................A-13
iii
CHAPTER I FEATURES AND SPECIFICATIONS
1. FEATURES
This printer has the following features: UP to 1200dpi Resolution and 10ppm Printing Speed True 600 dots per inch (dpi) with microfine toner and ten pages per minute (ppm) printing speed (A4 or Letter size paper). The printer also supports 1200 (H) x 600 (V) dots per inch (dpi) resolution for Windows DIB graphics. (It is recommended to add memory when printing in 1200 x 600dpi mode.) Enhanced Printing Performance and User-Friendly Operation for Windows The dedicated printer driver and TrueTypeTM-compatible fonts for Microsoft® Windows 3.1 and Windows 95 are available on the floppy disk supplied with your printer. You can easily install them into your Windows system using our installer program. The driver supports our unique compression mode to enhance printing speed in Windows applications and allows you to set various printer settings including toner saving mode, custom paper size, sleep mode, gray scale adjustment, resolution, and so forth. You can easily setup these print options in the graphic dialog boxes through the Printer Setup menu within the Windows Control Panel. High Resolution Control & Advanced Photoscale Technology High resolution control (HRC) technology provides clear and crisp printouts. Use this function to get smooth text print quality. Advanced photoscale Technology enables the printer to print graphics in 256 grayscale levels, producing nearly photographic quality. Use this function when you want to print photographic images. Two Interfaces This printer has a high speed bi-directional parallel interface and a Universal Serial Bus (USB). If your application software supports the bi-directional parallel interface, you can monitor the printer status. It is fully compatible with the industry-standard bi-directional parallel interface. The Universal Serial Bus Interface is an interface which allows the printer to connect to multiple peripheral devices. The printer status monitor program can show the current status of your printer. When printing, an animated dialog box appears on your computer screen to show the current printing process. If an error occurs, a dialog box will appear to let you know what to correct. For example: when your printer is out of paper, the dialog box will display "Paper Empty" and instructions for the corrective action to take. Enhanced Memory Management The printer provides its own data compression technology in its printer hardware and the supplied printer driver software, which can automatically compress graphic data and font data efficiently into the printer's memory. You can avoid memory errors and print most full page 600dpi graphic and text data, including large fonts, with the printer's standard memory.
I-1
Remote Printer Console Program for DOS The utility program, Remote Printer Console (RPC), is available on the floppy disk supplied with your printer. When you operate your computer in the DOS (Disk Operating System) environment, this program allows you to easily change the default settings of the printer such as fonts, page setup, emulations and so on. This program also provides a status monitor program, which is a Terminate-and-Stay Resident (TSR) program. It can monitor the printer status while running in the background and report the current status or errors on your computer screen. Popular Printer Emulation Support This printer supports four printer emulation modes, HP LaserJet 6P, Brother BR-Script Level 2, Epson FX-850, and IBM Proprinter XL. When you use DOS application software or Windows version 3.0 or earlier, you can use any of these emulations to operate the printer. The printer also supports Auto-emulation switching between HP and Epson or HP, BR-Script 2 and Epson or HP, Brother BR-Script 2 and IBM. If you want to select the printer emulation, you can do it using the Remote Printer Console Program. Versatile Paper Handling The printer has two multi-purpose sheet feeders and a straight paper path mechanism. From the front Feeder 1, you can load A4, letter, legal, B5, A5, A6, and executive sizes of paper, and various types of media including envelopes, postcards, organizer paper, or your custom paper size. From the rear Feeder 2 you can load A4, letter, legal, B5 and executive sizes of paper. The front Feeder 1 also allows manual paper loading, so you can also use labels and transparencies. Environment-Friendly
Economy Printing Mode:
This feature will cut your printing cost by saving toner. It is useful to obtain draft copies for proof-reading. You can select from two economy modes 25% toner saving and 50% toner saving, through the Windows printer driver supplied with your printer.
Sleep Mode (Power Save Mode):
Sleep mode automatically reduces power consumption when the printer is not in use. The printer consumes less than 13W when in sleep mode. Low Running Cost: The toner cartridge is separate from the drum unit. You need to replace only the toner cartridge after around 2,200 pages, which is cost effective and ecologically friendly.
I-2
2.
2.1
SPECIFICATIONS
Printing Print method Resolution Electrophotography by semiconductor laser beam scanning 1200 (H) x 600 (V) dpi (for Windows DIB graphics) 600 x 600dpi (for Windows / DOS) 300 x 300dpi (under Apple Macintosh using optional RS-100M) Up to 10 page/minute (when loading Letter-size paper from the multipurpose sheet feeder 1) Max. 30 seconds at 23°C (73.4°F) 15 seconds (when loading Letter-size paper from the multipurpose sheet feeder 1) Toner cartridge Life Expectancy: 2,400 pages/cartridge (when printing A4 or letter size paper at 5% print coverage) Developer Drum unit, separated from toner cartridge Life Expectancy: 20,000 pages/drum unit (4% coverage, continuous printing) at 20 pages per job 8,000 pages at 1 page per job
Print speed
Warm-up First print
Print media
2.2
Functions CPU Emulation Fujitsu MB86831 66Mhz Automatic emulation selection among HP LaserJet 5P, EPSON FX-850, and IBM Proprinter XL BR-Script Windows 95 / WindowsTM 3.1/3.11 driver, supporting Brother Printing Solution for Windows, Brother Native Compression mode and bi-directional capability Optional Macintosh® driver available for System 6.0.7 or higher Bi-directional parallel interface Universal Serial Bus (USB) A RS-422A/RS-232C serial interface is optionally available. 4.0Mbytes with Data Compression Technology Expandable up to 36Mbytes with the SIMM 1 switch and 5 lamps Self-diagnostic program
Printer driver
Interface
Memory
Control panel Diagnostics
I-3
PR99017
2.3
Electrical and Mechanical Power source U.S.A. and Canada: Europe and Australia: Printing (peak): Printing (average): Standing by: Sleep: Printing: Standing by: Operating: Storage: Operating: Storage: AC 110 to 120V, 50Hz/60Hz AC 220 to 240V, 50Hz/60Hz
Power consumption
820W or less 280W or less 60W or less 13W or less
Noise
49dB A or less 38dB A or less 10 to 32.5°C (59 to 90.5°F) 0 to 40°C (38 to 104°F) 20 to 80% (non condensing) 10 to 85% (non condensing)
Temperature
Humidity
Dimensions (W x D x H)
402 (W) x 439 (D) x 274 (H) mm (when the output tray is closed.)
Weight
Approx. 9.6kg (21.2lb.) including the drum unit and toner cartridge
Note: N The peak figure of power consumption is worked out when the halogen heater lamp is turned ON. N The peak figure of power consumption is worked out excluding inrush current value. N Be sure that the peak figure of power consumption is reference value and should be used inside the Brother offices only..
I-4
2.4
Paper Specification (1) Multi-purpose sheet feeder loading < Sheet Feeder 1 (Front)> Paper size: A4, Letter, Legal, B5, A5, A6, and Executive, and other sizes of media that can be handled by the feed mechanism, can be loaded.
69.8 to 229 mm
105 to 406mm (face down)
Feeding direction
Feedable paper weight: 60 (16lb.) to 157 (42lb.) g/m2 Maximum load height : Envelopes : Setting method: 22mm (200 sheets of 80g/m2 paper) letter size 10 envelopes Pull the MP sheet feeder 1 cover toward you, insert the stack of paper into the feeder, aligning the top edge of the sheets, then push the cover back to its original position.
Paper size: A4, Letter, Legal, B5, and Executive, and other sizes of media that can be handled by the feed mechanism, can be loaded, except special papers such as envelopes, OHP sheets, labels and organizer sheets.
90 to 229 mm
250 to 406mm (face down)
Feeding direction
Feedable paper weight: 60 (16lb.) to 157 (42lb.) g/m2 Maximum load height: Setting method: 22mm (200 sheets of 80g/m2 paper) letter size. Pull the MP sheet feeder 2 cover toward you, insert the stack of paper into the feeder, aligning the top edge of the sheets, then push the cover back to its original position.
I-5
2.5
Print Delivery (1) (2) With the output tray opened Tray capacity : Maximum 100 sheets (80g/m2), face-down only With the output tray closed Tray capacity : 1 sheet (80g/m2), face-down only
Note: Face down: Environment :
Deliver the printed face of the paper downward. 23°C
2.6
Paper (1) Types of paper (a) Normal paper (60 to 157g/m2, specified types of high-quality paper) · · · · · · · · * A4 size Letter size Legal size B5 size A5 size A6 size Executive size 9" envelop size (maximum printable area) The recommended types of plain paper are as follows: Letter : Xerox 4200 (75g/m2) A4 : Xerox 80 Premier Paper (80g/m2) Labels Envelopes (DL, C5, COM10) Postcards Organizers (K, L, and J sizes of DAY-TIMERS)
(b)
Special paper (specified types) · · · ·
(a) Normal paper (60 to 157g/m2, specified types of high-quality paper) · · · · · · A4 size Letter size Legal size B5 size Executive size The specified types of plain paper are as follows: Letter : Xerox 4200 (75g/m2) A4 : Xerox 80 Premier Paper
I-6
(2)
Paper feed conditions Type Name 60 to 80 g/m
2
Feeder Feeder 1 Feeder 2
Manual feed
r
(200 sheets)
r
(200 sheets)
r r r r r r r
Normal paper (cut sheet)
80 g/m paper (Legal)
2
r
(100 sheets)
r
(100 sheets)
157 g/m
2
r
(30 sheets)
r
(30 sheets)
Labels
r
(50 sheets)
! ! ! !
Special paper (cut sheet)
Envelopes
r
(10 sheets)
Postcards
r
(30 sheets)
Organizers
r
(10 sheets)
2.7
Effective Printing Area Printable area
F E A C E
B
D
F
I-7
The table below shows the effective printing areas. Size A4 A 210.0mm 8.27" (2,480 dots) 215.9mm 8.5" (2,550 dots) 215.9mm 8.5" (2,550 dots) 182.0mm 7.16" (2,149 dots) 176.0mm 6.93" (2,078 dots) 184.15mm 7.25" (2,175 dots) 148.5mm 5.85" (1,754 dots) 105.0mm 4.13" (1,240 dots) 69.85mm 2.75" (825 dots) 95.25mm 3.75" (1,125 dots) 139.7mm 5.5" (1,650 dots) 104.78mm 4.125" (1,237 dots) 98.43mm 3.875" (1,162 dots) 162mm 6.38" (1,913 dots) 110mm 4.33" (1,299 dots) 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) 210.0mm 8.27" (2,480 dots) 148.5mm 5.85" (1,754 dots) 127.0mm 5.0" (1,500 dots) 171.45mm 6.75" (2,025 dots) 215.9mm 8.5" (2,550 dots) 241.3mm 9.5" (2,850 dots) 190.5mm 7.5" (2,250 dots) 229mm 9.01" (2,704 dots) 220mm 8.66" (2,598 dots) C 203.2mm 8.0" (2,400 dots) 203.2mm 8.0" (2,400 dots) 203.2mm 8.0" (2,400 dots) 170.0mm 6.69" (2,007 dots) 164.0mm 6.46" (1,936 dots) 175.7mm 6.92" (2,075 dots) 135.8mm 5.35" (1,604 dots) 93.0mm 3.66" (1,098 dots) 57.15mm 2.25" (675 dots) 82.55mm 3.25" (975 dots) 127.0mm 5.0" (1,500 dots) 92.11mm 3.63" (1,087 dots) 85.7mm 3.37" (1,012 dots) 150.0mm 5.9" (1,771 dots) 98.0mm 3.86" (1,157 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) 201.5mm 7.93" (2,380 dots) 140.0mm 5.51" (1,654 dots) 118.5mm 4.66" (1,400 dots) 162.98mm 6.42" (1,925 dots) 207.43mm 8.17" (2,450 dots) 232.8mm 9.16" (2,750 dots) 182.0mm 7.16" (2,150 dots) 220.5mm 8.68" (2,604 dots) 211.5mm 8.33" (2,498 dots) E 3.4mm 0.13" (40 dots) 6.35mm 0.25" (75 dots) F 4.23mm 0.17" (50 dots)
Letter
v v v v v v v v v v v v v v
Legal
v
6.01mm 0.24" (71 dots)
B 5 (JIS)
B 5 (ISO)
v
6.35mm 0.25" (75 dots) 6.01mm 0.24" (71 dots)
Executive
A5 A6
v
6.35mm 0.25" (75 dots)
Organizer (J size) Organizer (K size) Organizer (L size)
v v v v
6.01mm 0.24" (71 dots)
COM-10
MONARCH
C5
DL
v
(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.
I-8
3.
3.1
SAFETY INFORMATION
Laser Safety (110 - 120V Model only) This printer is certified as a Class 1 laser product under the US 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 the protective housings and external covers, the laser beam cannot escape from the machine during any phase of user operation.
3.2
FDA Regulations (110 - 120V Model only) The US 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.
The label for Japanese manufactured products MANUFACTURED: BROTHER INDUSTRIES, LTD. 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467, Japan. This product complies with FDA radiation performance standards, 21 CFR Subchapter J.
The label for US manufactured products MANUFACTURED: BROTHER INDUSTRIES (USA) INC. 2950 Brother Blud., Bartlet, TN 38133, U.S.A. This product complies with FDA radiation performance standards, 21 CFR Subchapter J.
I-9
3.3
Caution for Laser Product (Warnhinweis für Laserdrucker) CAUTION: When the machine during servicing is operated with the cover open, the regulations of VBG 93 and the performance instructions for VBG 93 are valid. In case of any trouble with the laser unit, please replace the laser unit itself. To prevent direct exposure to the laser beam, do not try to open the enclosure of the laser unit. Im Falle von Störungen der Lasereinheit muß diese ersetzt werden. Das Gehäuse der Lasereinheit darf nicht geöffnet werden, da sonst Laserstrahlen austreten können.
CAUTION:
ACHTUNG:
(1)
Location of the laser beam window.
Window
Fig. 1.1 (2) Location of Caution Label for Laser Product. (200V only)
CLASS 1LASER PRODUCT APPAREIL Å LASER DE CLASSE 1 LASER KLASSE 1 PRODUKT
Fig. 1.2
I-10
CHAPTER II THEORY OF OPERATION
1.
1.1
ELECTRONICS
General Block Diagram Fig. 2.1 shows a general block diagram of the HL-1070 printer.
External Device Parallel USB Erase Lamp Paper Tray Unit Paper Feeder Manual Feed Transfer Block Fixing Unit Developing Block Charging Block Drum Cleaner Block Paper Eject Block Paper Feed System Toner Cartridge External Device External Device
Optional RAM(SIMM) (Max. 32Mbytes) Control System Expansion Memory I/O
Optional I/F Board ( RS-232C)
Expansion I/O
Low-voltage Power Supply Block
Video Control Block
Interface Block
Engine Control Block
Operation Block (Operation Panel)
High-voltage Power Supply Block
Laser Scanner Unit
Drive Block (Stepping Motor)
Drum Unit
Image Generation System
Fig. 2.1
II-1
1.2
Main PCB Block Diagram Fig. 2.2 shows the block diagram of the main PCB.
A S I C CPU Core Reset Circuit MB86831PFV BUS INT Oscillator (33.333333MHz)
Address Decoder Program + Font ROM (8Mbytes) DRAM Control
Timer Flash Memory (1Mbytes) FIFO
RAM (4Mbytes) DATA EXTENSION
Option RAM (SIMM) (Max. 32Mbytes)
Parallel I/O
To PC
USB I/O
To PC
Software Support Option Serial I/O (RS232C & RS422A)
EEPROM (512 x 8bits)
EEPROM I/O
Motor Driver
Engine Control I/O
To Panel Sensor PCB
Fig. 2.2
II-2
1.3
Main PCB 1.3.1 CPU Core
Fig. 2.3 and 2.4 show the CPU circuit blocks on the main PCB. The CPU is a Fujitsu MB86831PFV-G-BND which is driven at a clock frequency of 33.333333MHz.
Fig. 2.3
II-3
Fig.2.4
II-4
1.3.2 (1)
ASIC Oscillator circuit Generates the main clock for the CPU.
The ASIC is composed of a Cell Based IC that contains the following functional blocks.
(2)
Address decoder Generates the CS signal for each device.
(3)
DRAM control Generates the RAS, CAS, WE, OE and MA signals for the DRAM and controls the refresh processing (CAS before RAS self-refreshing method).
(4)
Interrupt control Interrupt levels: Priority High 10 9 8 7 6 5 4 3 2 1 Reserve interrupt 1 (for debug) Watch Dog Timer LSB EMPTY (for VDO FIFO) Timer 1 USB XIO interrupt (RS-100M) or MIO interrupt BD (for engine check) Reserve interrupt 2 CDCC Timer 2
Low
Note: All the interrupts can be masked. The priority of level 7, 6, and 5 are changeable from the program.
(5) Timers The following timers are included: Timer 1 Timer 2 Timer 3 (6) FIFO A 10Kbit FIFO is included. Data for one raster is transferred from the RAM to the FIFO by DMA transmission and is output as serial video data. The data cycle is 10.43mhz. 32-bit timer 32-bit timer Watch-dog timer
II-5
(7)
Parallel I/O There are two modes in this unit. One is the CPU receive mode and the other is the DMA receive mode. In the CPU receive mode the CPU receives the command data from the PC, and after the CPU is switched to the DMA mode, it receives the image data and writes it to the DRAM directly.
CPU Receive Mode
STROBE
BUSY ACK 90 µsec 0.5 µsec
DMA Receive Mode
STROBE
BUSY ACK 1.5 µsec 0.5 µsec
BUSY goes HIGH at the falling edge of the STROBE signal. The data (8 bits) from the PC is latched into the data buffer at the rising edge of the STROBE signal. The pulse width of ACK varies according to the speed MODE as shown above. BUSY goes LOW on the rising edge of ACK. This supports the IEEE1284 data transfer with the following mode. Nibble Byte ECP (8) Data extension This circuit extents the compressed image data which are received from the PC, and writes the bit map data to the FIFO. (9) Software support Supports 16 x 16 rotation, bit expansion, bit search, and decimal point conversion. (10) EEPROM I/O One output port and one I/O port are assigned. mode mode mode
II-6
1.3.3
ROM
The program and the font data are stored in 4Mbytes of ROM. The ROM is composed of two 32Mbit masked ROMs which are mounted in 42-pin IC sockets.
Fig. 2.5
1.3.4
Flash Memory
The program and the font data are stored in 1Mbytes of flash memory.
Fig. 2.6
II-7
1.3.5
DRAM
Four 16Mbit DRAM (x 16bit) are used as the printer memory.
Fig. 2.7
II-8
1.3.6
Optional RAM
A 32bit SIMM (72 pin) can be fitted as optional RAM. The main PCB has one slot and its capacity is for SIMM from 1Mbytes to 32Mbytes.
Fig. 2.8
II-9
1.3.7
Optional Serial I/O
The interrupt of the serial I/O is input to the EXINT terminal of the ASIC, and recognized by the CPU. A 32-byte space for a register is provided for this I/O, which is read and written to by the CPU.
Fig. 2.9
1.3.8
EEPROM
The EEPROM is an X24C04F two-wire type with a 512 x 8bits configuration.
Fig. 2.10
II-10
1.3.9
Reset Circuit
The reset IC is a PST596DNR. The reset voltage is 4.2V (typ.) and the LOW period of the reset signal is 50ms (typ.).
Fig. 2.11
1.3.10
Parallel I/O
Fig. 2.13 shows the parallel interface circuit.
Fig. 2.12
II-11
1.3.11
Engine I/O
Fig. 2.14 and 2.15 show the engine interface circuit.
Fig. 2.13
II-12
Fig.2.14
II-13
1.3.12
Paper Feed Motor Drive Circuit
A DC motor is used for paper feeding.
Fig. 2.15 1.3.13 USB I/O
Fig. 2.17 shows the USB interface circuit.
Fig. 2.16 1.4 Driver PCB The following parts are mounted on the driver PCB. · Connectors ..................Low-voltage, high-voltage, solenoid, main motor, toner sensor, laser, polygon motor, connector for main PCB · Registration sensor
1.5
SW Panel PCB The following parts are mounted on the SW panel PCB. · Operation panel ........1 Key, 5 LEDs
II-14
1.6
Power Supply 1.6.1 Low-voltage Power Supply The power supply uses a switching regulation system to generate the regulated DC power (+5V and +24V), which are converted from the AC line.
(Heater)
Thermal Fuse Heater Circuit Lamp
Fuse
Lightning Surge Absorber
Fuse
Feedback
Line Filter
Rectifier
Oscillator
(Driver Circuit)
24V Regulation Circuit
24V
5V Regulation Circuit
5V
Fig. 2.17
II-15
1.6.2
High-voltage Power Supply, SR PCB
This generates and outputs the voltages and currents for the charging, development and transfer functions.
IC PROTECTOR IP001 24VI 24VI GND
Current Regulator
Current Regulator
24VI GND T1 T101
Voltage Regulator
Transfer Roller Supply Roller Photosensitive Drum Developing Roller Cleaner Roller
VR201 VR202
Current Regulator Corona Unit T601 Q602
Voltage Regulator
T701 Q702 GND
PAPER SENSOR Voltage Regulator PC001
Z301 VR301
Voltage Regulator
VR401
Voltage Regulator
VR501
Fig. 2.18
II-16
2.
2.1
MECHANICS
Overview of Printing Mechanism
MP Feeder 2 Cover Multi-purpose Sheet Feeder 2 Papers Multi-purpose Sheet Feeder 1 Manual Paper Path MP Feeder 1 Cover Paper Pick-up Roller Paper Feed Roller Pitch Roller Drum Unit Photosensitive Drum Transfer Roller Erase Lamp Fixing Unit Pressure Roller Pinch Roller Paper Feed Roller Hopper Plate Eject Roller
Papers
Hopper Plate
Blade
Paper Pick-up Roller
Registration Sensor Lever Toner Cartridge Polygon Mirror
Eject Sensor Actuator Heat Roller DevelopThermistor ment Roller Cleaning Roller
Laser Scanner
Toner Empty Sensor
Corona Wire Supply Roller Scanner Unit
Fig. 2.19
EL PCB SW Panel PCB Scanner Unit Main Motor Fan Motor Solenoid Resist HighVoltage Power Supply SR PCB Primary Charger (Corona Wire) Primary Charger (Grid) Developer Roller Transfer Roller Relay PCB Solenoid Bin Thermistor (for Heat roller) Toner Empty Sensor PCB Toner Empty Sensor Thermistor (for Tonner)
Main Cotrol PCB
Driver PCB
Fig. 2.20
II-17
2.2
Paper Transfer 2.2.1 Paper Supply The pick-up roller picks up one sheet of paper from the paper feeder every time it is rotated and feeds it to the paper feed roller.
Papers Pick-up roller
Registration sensor lever
Hopper plate
Separation pad
Fig. 2.21 The paper is gripped between the pick-up roller and the separation pad and separated into individual sheets. The pick-up roller is directly connected to the sector gear, whose rotation is forcibly stopped by the gear stopper; when the pick-up solenoid is activated, the clutch mechanism is engaged by the solenoid action and the sector gear is driven; when it has completed one full turn its rotation is stopped again by the gear stopper. The paper drawn out by the pick-up roller pushes against the top of form sensor lever and the paper top position/absence of paper is detected by sensing the motion of the lever. 2.2.2 Paper Registration
When paper picked up from the multi-purpose sheet feeder (MPF) pushes against the top of form sensor actuator, the registration sensor lever is caused to turn, and the photo sensor detects this motion. When this signal from the sensor is detected the paper feed roller is stopped temporarily by the clutch. The paper is fed to the nip point between the paper feed roller and the pinch roller in the multi-purpose sheet feeder, and the skew of the paper is corrected by pushing the leading edge of the paper against the nip point. When the paper feed roller starts to be rotated again when it is released by the clutch, paper with the leading edge correctly aligned, is fed by the paper feed roller and is transported to the transfer roller.
Paper Pinch roller Transfer roller
Paper feed roller Drum Clutch mechanism (engaged/released by the solenoid assembly) Released when the solenoid is ON and engaged when the solenoid is OFF.
Fig. 2.22
II-18
2.2.3
Paper Eject
The completion of paper eject is detected in the following manner: (a) When the leading edge of the paper pushes down the eject sensor actuator located in the fixing unit, the photo sensor (photo interrupter) is opened and detects the start of paper eject. (b) When the trailing edge of the paper has passed through the paper eject sensor actuator, the photo sensor is closed and the completion of paper eject is recognized.
Transfer roller
Pressure roller
Eject sensor actuator Eject roller
Drum Heat roller
Fig. 2.23
Eject sensor actuator
, ,
Paper Sensor Eject sensor actuator Sensor
High-voltage power supply PCB
Fig. 2.24
II-19
2.3
Sensors 2.3.1 Cover Sensor
Detects opening and closing of the top cover.
Top cover
Cover switch
Fig. 2.25 2.3.2 Toner Empty Sensor
Detects if there is toner in the toner cartridge. It also detects whether or not the drum unit is installed. (The toner cartridge is installed in the drum unit).
Toner empty sensor
Fig. 2.26
II-20
2.4
Drum Unit 2.4.1 Photosensitive Drum Generates the latent electrostatic image and develops the image on the drum surface. 2.4.2 (1) (2) Primary Charger Corona wire Generates the ion charge on the drum. Grid Spreads the ion charge evenly over the drum surface. Developer Roller
Forms a uniform charge on the drum surface.
2.4.3
Develops the latent electrostatic image on the drum surface by the addition of the toner. 2.4.4 Transfer Roller
Transfers the toner image to the paper from the drum surface. 2.4.5 Cleaner Roller
Removes and recycles the toner remaining on the drum surface. 2.4.6 Erase Lamp
Discharges the electrostatic latent image on the drum. 2.5 Print Process 2.5.1 Charging The drum is charged to approx. +1000V by an ion charge which is generated by the primary charger. The charge is generated by ionization of the corona wire, which has a DC bias from high-voltage power supply applied to it. The flow of the ion charge is controlled by the grid to ensure it is distributed evenly on the drum surface. The drum sleeve is regulated to approx. 280V by the voltage regulator.
280V Passive Type Voltage Regulator
Voltage Regulator
+ + + -- + ++ - - - ++ + + 1000V + + + + + + + + + ++
Corona wire
-
Aluminum drum sleeve Drum Organic Photoconductor layer Grid
HVPS
Fig. 2.27 The primary charge uses a corona wire, but since the drum is positively charged, only less than 1/10 of the usual quantity of ozone is generated compared with the negatively charged drum. The level of ozone expelled from the printer is therefore not harmful to the human body. Applicable safety standards have been complied with.
II-21
2.5.2
Exposure Stage
After the drum is positively charged, it is exposed to the light emitted from the laser unit.
Drum Laser Beam
Paper Laser beam f lens Laser detector Laser diode Motor Lens Polygon mirror
Fig. 2.28 The area exposed to the laser beam is the image to be printed. The surface potential of the exposed area is reduced forming the electrostatic image to be printed.
1 Cycle of drum
1 4 2
Primary charging Laser beam exposure and developing (a) Unexposed area ( Non image area ) (b) Exposed area ( Image area ) Transfer the image to paper Erase the residual potential
Surface Potential (V)
1 +1000 +700
2 (a)
3
3 (b) 4
+400 Drum +300 Sleeve Time
Fig. 2.29
II-22
2.5.3
Developing
Developing causes the toner to be attracted to the electrostatic image on the drum so as to transform it into a visible image. The developer consists of a non-magnetic toner. The development roller is made of conductive rubber and the supply roller which is also made of conductive sponge rotate against each other. The toner is charged and carried from the supply roller to the development roller. The toner adheres to the development roller and is conveyed to the drum at an even thickness controlled by the blade. The toner is nipped between the development roller and the drum and developed onto the latent image on the drum. The electrostatic field between the drum and the development roller, which is DC-biased from the high-voltage power supply, creates the electrostatic potential to attract toner particles from the development roller to the latent image area on the drum surface.
(a) Transfer process [ON] Transfer roller Blade Toner Separator (b) Cleaning process [ON]
Auger
Drum Erase lamp
Develop housing
(a) Collecting process
Supply roller DC-bias SR-bias Development roller Cleaning roller Charger (b) Discharging process
Fig. 2.30 2.5.4 (a) Transfer Transfer process After the drum has been charged and exposed, and has received a developed image, the toner formed is transferred onto the paper by applying a negative charge to the backside of the paper. The negative charge applied to the paper causes the positively charged toner to leave the drum, and adhere to the paper. As a result, the image is visible on the paper. (b) Cleaning process of transfer roller If the toner is not transferred onto the paper perfectly, it is possible that there may be residual toner on the drum which will adhere to the transfer roller. The transfer voltage charges to a positive voltage during non-printing rotation of the drum. Therefore the transfer roller is cleaned by returning the positive charged toner adhered on the transfer roller onto the photo-conductive drum.
II-23
2.5.5 Drum Cleaning Stage In the image transfer stage, not all the toner on the photosensitive drum is transferred onto the paper but some remains on the drum. In the drum cleaning stage, the drum surface is cleaned by the cleaning roller, so that residual toner on the drum surface is removed and collected on the cleaning roller itself. The residual toner on the cleaning roller will be discharged to the drum when starting or non-printing time. The toner will be collected by the developing roller and reused (for further developing). 2.5.6 Erasing Stage
Before the cleaning stage, the drum surface is exposed to the light emitted from the erase lamp. (LED lamp) This stage prepares the drum by decreasing its surface voltage uniformly, ready to receive uniform change in the primary charging stage. 2.5.7 Fixing Stage
An image transferred on paper by static electricity is fixed by heat and pressure when passing through the heat roller and the pressure roller in the fixing unit. The thermistor ASSY keeps the surface temperature of the heat roller constant by detecting the surface temperature of the heat roller and turning on or off the halogen heater lamp.
Thermistor ASSY
Halogen heater lamp
, , , ,, , , , , , ,, , , ,, ,,,,, , , , ,, ,, ,, , ,, ,, , ,
Pressure roller
,, , ,, , , , ,
Heat roller Cleaner ASSY
Fig. 2.31
II-24
CHAPTER III DISASSEMBLY AND REASSEMBLY
1. SAFETY PRECAUTIONS
To avoid creating secondary problems by mishandling, be careful to follow the following precautions during maintenance work. (1) (2) (3) (4) (5) Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the printer. Be careful not to lose screws, washers, or other parts removed. Be sure to apply grease to the gears and applicable positions specified in this chapter. When using soldering irons or other heat-generating tools, take care not to accidentally damage parts such as wires, PCBs, and covers. Before handing any PCBs, touch a metal portion of the equipment to discharge any static electricity charge on your body, or the electronic parts or components may be damaged. When transporting PCBs, be sure to wrap them in the correct protective packaging. Be sure to replace self-tapping screws correctly, if removed. Unless otherwise specified, tighten screws to the following torque values. TAPTITE, BIND or CUP B M3 : 7kgf · cm M4 : 10kgf · cm TAPTITE, CUP S M3 : 8kgf · cm SCREW M3 : 7kgf · cm M4 : 8kgf · cm (8) When connecting or disconnecting cable connectors, hold the connector bodies, but not the cables. If the connector has a lock, release the connector lock first to unlock it. After a repair, check not only the repaired portion but also all connectors, also check that other related portions are functioning properly before operational checks.
(6) (7)
(9)
III-1
BOTTOM
10 MAIN PCB ASSY
2.
1
DRUM UNIT
B
11 BASE PLATE ASSY
B A
12 DRIVER PCB 13 LOW-VOLTAGE PS PCB ASSY 14 HIGH-VOLTAGE PS PCB ASSY
2
OUTPUT TRAY ASSY
3
TOP COVER
DISASSEMBLY FLOW
C
15
FAN MOTOR
4 16 DRIVE UNIT
5
MP SHEET FEEDER ASSY
6 17 MAIN MOTOR ASSY
UNDER SHOOT ASSY
III-2
18
8
FIXING UNIT
7
SR PCB / RELAY PCB GEARS and SOLENOID
C
9
SCANNER UNIT
A
19
PAPER SUPPORT
20
EXTENSION SUPPORT WIRE
3.
3.1
DISASSEMBLY PROCEDURE
Drum Unit (1) (2) Open the top cover. Lift out the drum unit.
Drum Unit
Top Cover
Main Cover
Fig. 3.1 3.2 Output Tray ASSY (1) Press the hinges at the left and right ends of the output tray inwards to release the output tray from the main cover.
Output Tray
Output Tray
Main Cover
Fig. 3.2
III-3
3.3
Top Cover (1) (2) Open the top cover. Press the hinges at the left and right ends of the top cover inwards to release the top cover from the main cover.
Note:
If it is impossible to release the top cover in the above way, press the side of the top cover ( ) while pulling the side of the main cover ( ).
Top Cover
Main Cover
Top Cover
Main Cover
Fig. 3.3 3.4 MP Sheet Feeder 1 ASSY
Note:
When disassembling the MP sheet feeder ASSY, the grease which smears your fingers will stick to the separation pad or the paper pick-up roller, and then spread to the paper and the drum unit. It might cause to appear black spots on the printing page.
Slide the upper portion of MP sheet feeder 1 toward you and remove it.
(1)
MP Sheet Feeder 1 MP Sheet Feeder 2
Main Cover
Fig. 3.4
III-4
(2) (3)
Raise the pick-up roller cover ( ) and remove it ( ). Remove the MP feeder cover ( ).
MP Feeder Cover
Pick-up Roller Cover
Fig. 3.5 (4) Remove the tray side covers R and L by releasing the three hooks inside each of the covers as the following order.
Tray Side Cover R
Top Side Cover L
1. Release the hook by hands. 2. Release the hook by using a screwdriver. 3. Release the hook by using a screwdriver. 4. Pull out the tray side covers straight. Fig. 3.6
III-5
PR98062 (5) After removing the sector gear, paper feed bearing, and bearing 6, take off the paper pick-up roller unit.
Bearing 6
Paper feed bearing Sector gear
Paper Pick-up Roller Unit
Fig. 3.7
(6)
Raise the pressure plate toward you and press both sides of the pad inward to release it by pressing the separation pad holder. Then take off the spring.
Note:
If it is impossible to release the pressure plate in the above way, press the side of the pressure plate ( ) while pulling the side of the sheet feeder ( ).
Pressure Plate
Separation Pad
Spring Separation pad holder
Fig. 3.8
Note:
Be sure to replace the regist sensor actuator film together whenever replacing the regist sensor actuator.
III-6
3.5
MP Sheet Feeder 2 ASSY (1) (2) Remove the four screws. Disassemble any other parts of MP sheet feeder 2 in the same way as described for MP sheet feeder 1.
MP Sheet Feeder 2 Screws
Screw
Main Cover
Fig. 3.9 3.6 Under Shoot ASSY (1) Disconnect the two cable harnesses from the relay PCB.
Under shoot ASSY Cable harness
Relay PCB ASSY
Fig. 3.10
III-7
(2) (3)
Remove the two screws. Lift the rear portion of the under shoot ASSY to remove it.
Main Cover
Under shoot ASSY
Fig. 3.11
Note:
Follow the number above in order when assembling.
Feed shaft roller
Plate spring
Fig. 3.12
III-8
3.7
SR PCB / Relay PCB (1) (2) Remove the SR protect sheet. Disconnect the connector of the SR harness ASSY connecting the SR PCB and the driver PCB and remove the high-voltage cover.
SR protect sheet
High-voltage cover
SR harness ASSY Main Cover
SR PCB
Fig. 3.13 (3) Disconnect the connector of the relay harness ASSY connecting the SR PCB and the relay PCB and remove the two screws on the SR PCB, and remove the SR PCB. Remove the relay PCB. Remove the two screws, and remove the electrode SR1, SR2.
Taptite, cup B M4x14 Taptite, cup B M4x14 Relay PCB Taptite, cup B SR PCB Ground wire Electrode SR2 Relay harness ASSY
(4) (5)
Main Cover
Electrode SR2
Fig. 3.14
III-9
3.8
Fixing Unit (1) (2) Remove the two screws. Lifting the fixing unit, disconnect the two heater harnesses and the thermistor connector on the EL PCB.
Screws Fixing Unit
Screws
EL PCB Thermistor harness
Thermistor connector
Heater harness (White)
Fig. 3.15 (3) (4) (5) (6) Unhook the harness of the thermistor ASSY from the hook of the fixing unit. Remove the screw. Remove the thermistor ASSY. Remove the cleaner ASSY.
Fixing Unit
Cup B tight M3x14
Thermistor ASSY
Hook Cleaner ASSY
Fig. 3.16
III-10
Note:
Follow instructions below when installing the thermistor in the fixing unit. · Place the cleaner felt of the cleaner ASSY under the heat roller. · Place the end of the thermistor on the heat roller. · Insert the boss1 of the thermistor into the hole of the fixing unit frame. · Do not place the thermistor on the boss2 of the fixing unit frame.
(7) (8)
Remove the two screws. Open the fixing unit cover along the open side of the fixing unit cover.
,, ,, ,,,, , ,, , , , ,, , , , , ,, , , ,, , ,
Thermistor Boss2 Boss1 Cleaner ASSY
Heat roller
, ,,
Fig. 3.17 Fig. 3.18 III-11
Fixing unit frame
Fixing unit cover
Screws Shaft Fixing unit cover
Pressure Roller
Fixing unit frame
PR98292
(9) (10)
Release the right side of the paper eject roller shaft. Remove the four eject pinch rollers and the pinch springs from the fixing unit frame. Then, remove the pinch spring from each pinch roller.
Paper eject roller shaft
Pinch Spring
Eject Pinch Roller
Fig. 3.18a (11) (12) (13) Remove the bind B tight 3 x 10 screw securing the connector plate. Remove the connector plate from the fixing unit frame and loosen the other bind B tight 3 x 10 screw securing the fixing unit cover. After removing the idle gear 16 from the fixing unit frame, the heat roller can be removed. You can then remove the halogen heater lamp from the heat roller.
Note:
Never touch the surface of the halogen heater lamp.
Heat roller
Halogen heater lamp (Blue 100V, Read 200V) Bind B tight
Bind B tight 3x10 Idle gear 16
Connector plate
Fixing unit frame
Fig. 3.19
III-12
3.9
Scanner Unit (1) (2) Remove the three screws. Lift out the scanner unit.
Screws
Screw
Scanner Unit
Main Cover
Driver PCB
Fig. 3.20 (3) (4) Disconnect the three connectors from the driver PCB. Remove the screw and the tape, and lift the toner sensor PCB from the scanner unit.
Note:
Never touch the inside of the scanner unit or the mirror when disassembling or reassembling. If there is any dirt or dust on the mirror, blow it off.
Screw
Toner Sensor PCB
Tape
Scanner Unit
Fig. 3.21
III-13
(5)
Turn the scanner unit upside down and remove the screw to release the toner sensor harness.
Screw
Scanner Unit
Toner sensor harness
Fig. 3.22 3.10 Main PCB ASSY (1) (2) Remove the four screws. Hold the hooks at left and right to pull out the main PCB ASSY.
Screw
Hook
Main PCB ASSY
Screws Hook
Fig. 3.23
III-14
3.11
Base Plate ASSY
Note:
(1) (2)
Prior to turning the printer upside-down, ensure that the drum unit has been removed from the printer.
Turn the printer upside down. Remove the five M4 and four M3 self tapping screws and one screw.
Taptite, cup M3x2 Taptite, cup M3x2 Screw
Taptite, bind M4x2
Taptite, cup M3x2
Base Plate ASSY
Soundproof Sponge
Fig. 3.24 (3) Lift the base plate ASSY and remove the grounding screw.
Base Plate ASSY
Ground wire Screw
Low-voltage Power Supply PCB ASSY
Fig. 3.25
III-15
Note:
See the Fig. 3.26 about the position installing the dumping material and the soundproof sponge A, B.
Dumping material
Soundproof sponge A
Soundproof sponge B
Soundproof sponge A
Fig. 3.26 3.12 Driver PCB ASSY (1) Remove the screw securing the driver PCB ASSY. (Slide the PCB A from underneath the main shield.)
A
Screw
Main Shield
Driver PCB ASSY
Insulation tape
Driver PCB ASSY
Fig. 3.27
III-16
(2)
Disconnect the eleven connectors from the PCB. (Three connectors have already been disconnected when removing the scanner unit.) 4 3 8
5 1
Driver PCB ASSY
9
10
11 12 13
(Name of the harnesses) 1. SW panel harness 2. Scan motor harness 3. Toner harness 4. Laser harness 5. Fan motor harness 7. Main connector 8. High-voltage flat cable 9. Erase lamp harness 10. SR harness 11. Solenoid harness 12. Main motor harness 13. Low-voltage harness
2 7
Main frame
Fig. 3.28
Note 1: When reassembling, the cable connectors must be inserted securely into the PCB connectors and the PCB must not be stressed by the harnesses. Note 2: The connectors should be inserted by matching the housing color and the number of pins.
3.13 Low-voltage Power Supply PCB ASSY (1) (2) Remove the screw securing the low-voltage power supply PCB ASSY. Disconnect the two connectors for the heater harness and the LV harness from the PCB.
LV harness
Low-voltage power supply ASSY
Heater harness Screw
<200V only>
Main cover
Fig. 3.29
III-17
3.14
High-voltage Power Supply PCB ASSY (1) (2) Remove the screw securing the high-voltage power supply PCB ASSY. Disconnect the HV flat cable from the PCB.
Screw
High-voltage Power Supply PCB ASSY
Density dial
HV flat cable
Main Cover
Fig. 3.30
Note:
When reassembling, the flat side of the density dial shaft must be aligned with the flat side of the density dial plastic adjustment cover.
3.15
Fan Motor ASSY (1) (2) Remove the screw securing the fan motor ASSY. Release the two hooks of the fan holder from the main cover.
Screw Hook
Hook
Fan Motor ASSY
Fig. 3.31
III-18
(3)
Remove the two screws securing the fan motor.
Fan Motor SW Panel PCB Screws
Fan Motor Holder
Fig. 3.32 3.16 Drive Unit (1) Unhook the heater harness from the drive unit.
Heater harness
Drive Unit
Hook
Fig. 3.33
III-19
(2) (3)
Release the hook to remove the gear cover. Remove the six screws securing the drive unit. Lift the drive unit while pressing and releasing the static removal plate spring on the drive unit.
Gear cover Screws Screws
Drive Unit
Hook
Gear cover
Static removal plate spring
Fig. 3.34 3.17 Main Motor ASSY (1) Remove the four screws securing the main motor ASSY.
Drive Unit
Screws
Main Motor ASSY
Fig. 3.35
III-20
3.18
Gears and Solenoid (1) Apply grease to the points shown below.
J
A
D
J
F
A
F
N
N
N
N
G
E
B
E
B
A
E
E
M, L
F
F
G
E G
D
A
K
A
H
A
A
A
C
A A
H
H
A
C
N H
E
Fig. 3.36
III-21
M
L
H
B
K
Note:
Sign A B
Follow instructions below when applying the grease.
Grease Dow Corning LTD. EM-30L Dow Corning LTD. EM-30L Application amount 1 rice-grain size 1 rice-grain size
When applying the grease Before installing the gear. After installing the bending washer, and before installing the gear. Before installing the gear.
C D E F G H J
Dow Corning LTD. EM-30L Dow Corning LTD. EM-30L Dow Corning LTD. EM-30L Dow Corning LTD. EM-D110 Dow Corning LTD. EM-30L
1 rice-grain size 5 rice-grain size 5 rice-grain size Refer to the Fig. 3.36 1 rice-grain size 5 rice-grain size 1/2 rice-grain size
After installing the drive unit on main body. After installing the drive unit on main body.
Dow Corning LTD. EM-30L Kanto Kasei LTD. FLOIL GE334C or GE676 Dow Corning LTD. EM-30L Dow Corning LTD. EM-D110 Dow Corning LTD. EM-D110
K L M N Before installing the gear.
1 rice-grain size Refer to the Fig. 3.36 Refer to the Fig. 3.36 5 rice-grain size
Dow Corning LTD. EM-D110
III-22
3.19
Paper Support (1) Pull the paper support down toward you and pull both legs outwards to release it.
MP Sheet Feeder 1,2
Paper Support
Fig. 3.37 3.20 Extension Support Wire (1) Raise the extension support wire toward you, press both legs inward to release it, and then release the paper stopper from the wire.
Output Tray
Paper Stopper
Extension Support Wire
Fig. 3.38
III-23
4.
PACKING
Documents
Accessories Carton
Pad
Pad PE sheet
Bag
Pad
Pad
Carton
Fig. 3.39
III-24
CHAPTER IV MAINTENANCE AND TROUBLESHOOTING
1.
1.1
INTRODUCTION
Initial Check (1) Operating environment Check if : · The source voltage stays within ±10% from the rated voltage shown on the rating plate. · The printer is installed on a solid, level surface. · The room temperature is maintained between 10°C and 32.5°C. The relative humidity is maintained between 20% and 80%. · The printer is not located in a dusty place. · The printer is not exposed to ammonia fumes or other harmful gases. · The printer is not located in a hot or humid area (such as near water or a humidifier). · The printer is not exposed to direct sunlight. · The room is well-ventilated. · The printer is not placed where the ventilation hole of the printer is blocked. (2) Print paper Check if : · A recommended type of print paper is being used (if the paper is too thick or too thin, or tends to curl, paper jams or paper feed problems may occur, or printed images may be blurred). · The print paper is damped. [If so, use fresh paper, and check whether the print quality improves or not.] (3) Consumables Check if : · The Toner lamp is not lit on the control panel when a toner cartridge is installed in the printer. [If the above lamp is lit, replace the cartridge with a new one. If blank spots occur on printouts, take out the drum unit and slowly rock it to redistribute the toner evenly.] (4) Others Condensation: When the printer is moved from a cold room into a warm room in cold weather, condensation may occur inside the printer, causing various problems as listed below: · Condensation on the optical surfaces such as the scanning mirror, lenses, the reflection mirror and the protection glass may cause the print image to be light. · If the photosensitive drum is cold, the electrical resistance of the photosensitive layer is increased, making it impossible to obtain the correct contrast when printing. · Condensation on the corona unit may cause corona charge leakage. · Condensation on the hopper gate and separation pad may cause paper feed troubles.
IV-1
If condensation has occurred, wipe the effected units or parts with a dry cloth. If the drum unit is unpacked soon after it is moved from a cold room to a warm room, condensation may occur inside the unit, which may cause incorrect images. Instruct the user to allow the unit to come to room temperature before unpacking it. This will take one or two hours. 1.2 Basic Procedure If a malfunction or incorrect print appears, make an initial check following the basic procedure below: (1) (2) Check the error lamps following the inspection proc edure described later in this section. If no error lamps are lit, see Section 4 for troubleshooting information. If any defecti