Text preview for : Brother HL-2060 Service Manual.pdf part of Brother HL-2060 Service Manual Laser Printer - (6.288Kb) Part 1/3 - pag. 147
Back to : laser_printer_®_.part1.ra | Home
LASER PRINTER
SERVICE MANUAL
MECHANICS & ELECTRONICS
No part this publication may be reproduced in any form or by any means without permission in writing from the publisher.
Trademarks: · BR-Script, DX-2000 and LT-2000 are registered trademarks of Brother Industries, Ltd. · Centronics is a registered trademark of Genicom Corporation. · PostScrip is a registered trademark of Adobe Systems Incorporated. · IBM Proprinter XL is a registered trademark of International Business Machines Corporation. · EPSON FX-850 is a registered trademark of Seiko Epson Corporation. · HP-GL and HP Laser Jet 5 are registered trademarks of Hewlett Packard Company.
PREFACE
This service manual contains basic information required for after-sales service of the laser printer (hereinafter referred to as "this machine" or "the printer"). This information is vital to the service technician in maintaining the high printing quality and performance of the printer. This manual consists of the following chapters:
CHAPTER I :
GENERAL Features, specifications, etc.
CHAPTER II :
THEORY OF OPERATION Basic operation of the mechanical system and the electrical system, and their timing.
CHAPTER III :
ELECTRICAL SYSTEM Theory of the electronics circuit
CHAPTER IV :
MECHANICAL SYSTEM Requirements for a suitable location, disassembling and reassembling procedure of mechanical system.
CHAPTER V :
MAINTENANCE AND SERVICING Parts replacement schedule, list of tools, lubricants and cleaners.
CHAPTER VI :
TROUBLESHOOTING Reference values and adjustment, troubleshooting for image defects, troubleshooting for malfunctions, etc.
APPENDICES : Engin Block Daiagram, PCB Circuitry Diagrams, 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 quality performance and fostering the pratical ability to find the cause of troubles.
CONTENTS
CHAPTER I GENERAL..................................................................... I-1
1. FEATURES......................................................................................................I-1 2. SPECIFICATIONS ...........................................................................................I-1 3. SAFETY INFORMATION .................................................................................I-6
3.1 Laser Safety (110 - 120V Model only)...................................................................................I-6 3.2 CDRH Regulations (110 - 120V Model only) ........................................................................I-7 3.3 Additional Information ...........................................................................................................I-7
4. PARTS OF THE PRINTER ..............................................................................I-8
4.1 External Views ......................................................................................................................I-8 4.2 Cross Sectional View ............................................................................................................I-9
5. STORAGE AND HANDLING OF EP-ED CARTRIDGES ...............................I-10
5.1 Storage of Sealed EP-ED HC Cartridges............................................................................I-10 5.2 Storage of Unsealed EP-ED HC Cartridges........................................................................I-10
CHAPTER II THEORY OF OPERATION ......................................... II-1
1. BASIC OPERATIONS.....................................................................................II-1
1.1. Mechanical Configuration....................................................................................................II-1 1.2. Main Drive ...........................................................................................................................II-2 1.3. Basic Sequence of Operations............................................................................................II-3
2. LASER/SCANNER SYSTEM ..........................................................................II-4 3. IMAGE FORMATION SYSTEM ......................................................................II-5
3.1 Outline..................................................................................................................................II-5 3.2 Printing Process ...................................................................................................................II-5 3.2 1 Electrostatic latent image formation stage ..................................................................II-6 3.2 2 Developing stage ........................................................................................................II-8 3.2 3 Transfer stage .............................................................................................................II-9 3.2 4 Fixing stage...............................................................................................................II-10 3.2 5 Drum cleaning stage .................................................................................................II-10 3.3 Operation ...........................................................................................................................II-11
4. PAPER PICK-UP/FEED SYSTEM ................................................................II-12
4.1 Outline................................................................................................................................II-12 4.2 Cassette Feed....................................................................................................................II-13 4.3 MP Tray Feed ....................................................................................................................II-14 4.4 Paper Jam Detection..........................................................................................................II-15
i
CHAPTER III ELECTRICAL SYSTEM ............................................ III-1
1. MAIN PCB......................................................................................................III-1
1.1. Outline................................................................................................................................III-1 1.2. Video Controller Circuit ......................................................................................................III-2 1.3. Engine Controller Circuit ....................................................................................................III-6
2. PAPER FEED DRIVE CIRCUIT.....................................................................III-7 3. DISPLAY CIRCUIT ........................................................................................III-9
3.1 Outline.................................................................................................................................III-9 3.2 Operation ............................................................................................................................III-9
4. LOW-VOLTAGE POWER SUPPLY ASSY ..................................................III-10
4.1 Outline...............................................................................................................................III-10 4.2 Protection Functions .........................................................................................................III-10
5. HIGH-VOLTAGE POWER SUPPLY ASSY..................................................III-12
5.1 Outline...............................................................................................................................III-12 5.2 Operation of the Components of the High-Voltage Power Supply Assy ...........................III-12
CHAPTER IV MECHANICAL SYSTEM ..........................................IV-1
PRINTER DISASSEMBLING PROCEDURE ..................................................... IV-2 PRINTER BODY ................................................................................................ IV-3
1.1 1.2 1.3 1.4 1.5 1.6 Configuration.................................................................................................................... IV-3 Control Panel Unit ............................................................................................................ IV-3 Toner Cartridge Lid .......................................................................................................... IV-3 Side Cover L .................................................................................................................... IV-4 Font Cover Assy .............................................................................................................. IV-5 Upper Cover Assy, Rear Cover Assy............................................................................... IV-5 1.6.1 Upper cover assy, rear cover assy .......................................................................... IV-5 1.6.2 Changeover guide, jam remove cover ..................................................................... IV-7 1.7 Side Cover R.................................................................................................................... IV-7 1.8 DC Fan Motor................................................................................................................... IV-8 1.9 Main PCB ......................................................................................................................... IV-9 1.10 Laser Unit....................................................................................................................... IV-11 1.11 Cartridge Stopper Assy .................................................................................................. IV-12 1.12 Paper Feed Chassis Unit ............................................................................................... IV-13 1.13 Separation Pad Assy...................................................................................................... IV-15 1.14 MP PE Sub Actuator ...................................................................................................... IV-15 1.15 P Feed /Size-SW PCB Assy .......................................................................................... IV-16 1.16 Size-Switch Spring ......................................................................................................... IV-16 1.17 Regist Sensor Actuator .................................................................................................. IV-16 1.18 PE Sensor Actuator MP ................................................................................................. IV-17
ii
1.19 Tray Sensor Holder ........................................................................................................ IV-17 1.20 Roller Holder .................................................................................................................. IV-18 1.21 Paper Pick-up Roller Assy, Bearing ............................................................................... IV-18 1.22 Paper Pick-up Solenoid.................................................................................................. IV-20 1.23 Paper Feed Motor Assy ................................................................................................. IV-20 1.24 MP Tray Cover ............................................................................................................... IV-21 1.25 MP Tray Assy................................................................................................................. IV-22 1.26 Paper Path Separation Plate, Paper Path Separation Film ........................................... IV-23 1.27 Latch .............................................................................................................................. IV-23 1.28 Fixing Unit (for both 120V and 230V, the only difference is the halogen heater)........... IV-24 1.29 Transfer Unit .................................................................................................................. IV-27 1.30 DC Gear Holder Assy .................................................................................................... IV-28 1.31 PS Switch Wire, Remote Switch .................................................................................... IV-29 1.32 High-Voltage Power Supply PCB Assy .......................................................................... IV-29 1.33 Low-Voltage Power Supply PCB Assy........................................................................... IV-30 1.34 Toner Cartridge (EP-ED HC Cartridge) ......................................................................... IV-31 1.35 Paper Tray ..................................................................................................................... IV-32
CHAPTER V MAINTENANCE AND SERVICING............................V-1
1. PERIODICAL REPLACEMENT PARTS ........................................................ V-1 2. CONSUMABLE PARTS STANDARD ENDURANCE TABLE ........................ V-1 3. LIST OF STANDARD TOOLS........................................................................ V-2 4. LIST OF LUBRICANTS AND CLEANERS..................................................... V-3
CHAPTER VI TROUBLESHOOTING..............................................VI-1
1. INTRODUCTION .......................................................................................... VI-1
1.1 Initial Check........................................................................................................................ VI-1 1.2 Basic Procedure................................................................................................................. VI-2
2. TEST PRINTING AND MECHANICAL CHECK ............................................ VI-2
2.1 Test Printing ....................................................................................................................... VI-2
3. IMAGE DEFECTS......................................................................................... VI-3
3.1 Image Defect Examples ..................................................................................................... VI-3 3.2 Troubleshooting Image Defects ......................................................................................... VI-4
4. TROUBLESHOOTING OF MALFUNCTIONS............................................. VI-11 5. TROUBLESHOOTING PAPER TRANSPORT PROBLEMS....................... VI-18
5.1 Paper Jams ...................................................................................................................... VI-18 5.2 Incomplete Paper Feed.................................................................................................... VI-21
iii
6. OPERATION................................................................................................ VI-23
6.1 Line Inspection Mode Procedure ..................................................................................... VI-23 6.2 DRAM Test....................................................................................................................... VI-25
7. STATUS MESSAGE LIST .......................................................................... VI-26
CHAPTER VII TROUBLESHOOTING............................................VII-1
1. HIDDEN FUNCTIONS ................................................................................. VII-1
1.1 Holding down Specified key(s) at Power on...................................................................... VII-1 1.2 Off-line and Hold down Mode + FF CONT keys ............................................................... VII-2 1.3 Off-line and Hold down CONT + SEL keys ..................................................................... VII-17
APPENDIX A
1. Engine Block Diagram .................................................................................. A-1 2. Paper Feed/Size-SW PCB Circuitry Diagram (1/1) ....................................... A-2 3. Main PCB Circuitry Diagram (1/7)................................................................. A-3 4. Main PCB Circuitry Diagram (2/7)................................................................. A-4 5. Main PCB Circuitry Diagram (3/7)................................................................. A-5 6. Main PCB Circuitry Diagram (4/7)................................................................. A-6 7. Main PCB Circuitry Diagram (5/7)................................................................. A-7 8. Main PCB Circuitry Diagram (6/7)................................................................. A-8 9. Main PCB Circuitry Diagram (7/7)................................................................. A-9 10. Control Panel PCB Circuitry Diagram (1/1)................................................. A-10 11. Laser LD PCB Circuitry Diagram (1/1) ........................................................ A-11 12. Serial NO. Description ................................................................................ A-12
iv
CHAPTER I GENERAL
1. FEATURES
A. This high-speed, non-impact (low-noise) printer is based on electrophotography, electronics and laser technology. The printer is compact and easy to carry. The internally-storable, front-loading paper cassette enables you to save an occupation space for the machine; the printer can now be installed in a smaller place. The charging roller, developing cylinder, photosensitive drum and cleaner of the printer are combined into a single assembly called an "EP-ED HC cartridge". The cartridge can be replaced by the user when necessary without a need of service call. High printing quality is maintained by a simple cleaning procedure. Laser beam safety is designed into the printer. The printer is approved by the US Center for Devices and Radiological Health (CDRH). Paper can be fed in two ways, by the multi-purpose paper feed tray and paper cassette. Maintenance is easy with print component units which are directly detachable, and they require no adjustment after reassembly.
B.
C.
D.
E.
F.
2.
SPECIFICATIONS
(1) (2) (3) Type Printing method Printing speed Cassette feed Desktop page printer Electrophotography (single-component dry toner)
20 ppm (600 x 600 dpi or 300 x 300 dpi, A4 size) 21 ppm (600 x 600 dpi or 300 x 300 dpi, Letter size) 10 ppm (1,200 x 1,200 dpi, A4 & Letter size) 16 seconds or less (A4 size by face-down print delivery from the paper cassette) Prestart by software command for 10 second first print
(4)
First print time
(5) (6)
Warm-up (WAIT) time Max. 1 minute at 20°C (68°F) Optical system Laser
Scanning system (7) Resolution Horizontal Vertical
Semiconductor laser Output power : 5mW max. Wave length : 780 nm Rotating six-faced polygon mirror
600 dots/inch and 1,200 dots/inch 600 raster lines/inch and 1,200 raster lines/inch
I-1
(8)
Printing system Photosensitive drum Charging Exposure Development Paper feed Image transfer Separation Fixing Toner supply Life expectancy
OPC Charging Roller Laser scanning system Toner projection development system Cassette or manual feed Roller method Natural(utilizing a small drum radius), Static charge eliminator Heated fixing roller Included in the replaceable EP-ED HC cartridge 9,000 pages/cartridge
(9)
Paper Cassette feed
Plain paper for Letter, Legal, A4 (A4 or letter size paper with the print density set at level 8 with 5% coverage, 2 2 recommended: 60 g/m - 105 g/m ) Plain paper of 95 x 148 mm - 216 x 356 mm 2 2 (recommended: 60g/m - 200 g/m , overhead projector (OHP) film, postcards, label stock and envelopes (specified sizes)
Multi-purpose Tray
(10)
Cassette (Tray 1) Paper cassette
A4 Letter / Legal Universal (Option) :
Maximum load height Feedable paper type (11) (12) Print delivery Print delivery tray capacity Face-down Face-up
A4, Letter, Legal, Executive, ISO B5, A5, ISO B6, A6 and approx. 20 envelopes. 2 A4: 55 mm (500 sheets of 80 g/m paper) 2 Letter / Legal: 52 mm (500 sheets of 75 g/m paper) 2 60 - 105 g/m Face-down or (face-up)
Approx. 500 sheets (80 g/m ) Discharge only
2
I-2
(13)
Effective printing area
E A C E
E
Printable area
B
D
E
Figure 1.1 Printable Area Effective printable area is referred to as a area within which is guaranteed the printing of all interface signal data on a hard copy without any omission. The tables below shows the effective printable area for each paper size.
Table 1.1 Plain Paper SIZE A4 Letter Legal B5 (ISO) Executive A5 B6(ISO) A6 A (mm) 210.0 215.9 215.9 176.0 184.2 148.0 125.0 105.0 B (mm) 297.0 279.4 355.6 250.0 266.7 210.0 176.0 148.0 C (mm) 203.2 207.4 207.4 167.5 175.7 139.5 116.5 96.5 D (mm) 288.5 270.9 347.1 241.5 258.2 201.5 167.5 139.5 E (mm) 3.39 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0
Table 1.2 Envelope SIZE COM-10 MONARCH DL C5 B5 (ISO) A (mm) 104.8 98.4 110.1 162.2 176.0 B (mm) 241.3 190.5 221.0 228.6 250.0 C (mm) 96.3 89.9 101.6 154.1 167.5 D (mm) 232.8 182.0 212.5 220.1 241.5 E (mm) 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0 4.23 ± 1.0
(The sizes above are nominal sizes according to ISO.) An A4 sheet accepts 80 PICA-pitch characters (203.2mm).
I-3
(14)
Standard interfaces
Automatic interface selection · Centronics, Bi-directional parallel · RS-232C serial Baud rate : 150, 300,1200, 2400, 4800, 9600 19200, 38400, 57600, 115200bps Stop bit : 1 bit Start bit : 1 bit or 2 bits Data length : 7 bits or 8 bits Parity : Odd, Even, or None Protocol : Xon/Xoff or DTR Automatic emulation selection · HP Laser Jet 5 (PCL Level 6) · EPSON FX-850 · IBM Proprinter XL · BR-Script level 2 (PostScript language emulation interpreter) · HP-GL MB86832 100MHz (SPARC architecture) 75 scalable fonts and 12 bitmapped fonts
(15)
Emulation
(16) (17)
CPU Resident fonts
HP Laser Jet 5, EPSON FX-850, IBM Proprinter XL Scalable Fonts: Intellifont Compatible Fonts: · Albertville, Extrabold · Antique Oakland, Oblique, Bold · Brougham, Oblique, Bold, Bold Oblique · Cleveland Condensed · Connecticut · Guatemala Antique, Italic, Bold, Bold Italic · Letter Gothic, Oblique, Bold · Maryland · Oklahoma, Oblique, Bold, Bold Oblique · PC Brussels Light, Light Italic, Demi, Demi Italic · PC Tennessee Roman, Italic, Bold, Bold Italic · Utah, Oblique, Bold, Bold Oblique · Utah Condensed, Oblique, Bold, Bold Oblique Windows 3.1 Compatible Fonts: · Tennessee Roman, Italic, Bold, Bold Italic · Helsinki, Oblique, Bold, Bold Oblique · BR Symbol · W Dingbats BR-Script Fonts: · Atlanta Book, Book Oblique, Demi, Demi Oblique · Copenhagen Roman, Italic, Bold, Bold Italic · Portugal Roman, Italic, Bold, Bold Italic · Calgary Medium Italic Brother Original Fonts: · Bermuda Script · Germany · San Diego · US Roman
Bitmapped Fonts (Portrait and Landscape): · Letter Gothic 16.66 Medium, Italic, Bold, Bold Italic · OCR-A · OCR-B
I-4
BR-Script Level 2 Mode Scalable Fonts: · Atlanta Book, Book Oblique, Demi, Demi Oblique · Brussels Light, Light Italic, Demi, Demi Italic · Brougham, Oblique, Bold, Bold Oblique · Helsinki, Oblique, Bold, Bold Oblique · Helsinki Narrow, Oblique, Bold, Bold Oblique · Copenhagen Roman, Italic, Bold, Bold Italic · Portugal Roman, Italic, Bold, Bold Italic · Tennessee Roman, Italic, Bold, Bold Italic · Calgary Medium Italic · BR Symbol · BR Dingbats (18) (19) RAM PCMCIA card slots · Albertville, Extrabold · Antique Oakland, Oblique, Bold · Cleveland Condensed · Connecticut · Guatemala Antique, Italic, Bold, Bold Italic · Letter Gothic, Oblique, Bold · Maryland · Oklahoma, Oblique, Bold, Bold Oblique · Utah, Oblique, Bold, Bold Oblique · Utah Condensed, Oblique, Bold, Bold Oblique · Bermuda Script · Germany · San Diego · US Roman
(20) (21)
Power souse Power consumption
(22) (23)
Noise Dimensions (W x H x D)
(24) (25)
Weight Environmental conditions Operating Temperature 10 ~ 32.5°C environment Relative humidity 20 ~ 80%RH (No condensation allowed) Air pressure 71.0 ~ 101.3 kPa (0 ~ 2,500 m above sea level) Non-operating Temperature 0 ~ 35°C environment Relative humidity 10 ~ 80%RH (No condensation allowed) Storage conditions · Printer Temperature Normal (total storage time x 9/10) 0 ~ 35°C Severe (total storage time x 1/10) High Low 35°C ~ 60°C -20°C ~ 0°C Temperature change (within 3 minutes) High Low 60°C 15°C -20°C 25°C
8M bytes (expandable to 72M bytes with SIMMs) Two slots Right slot for Type I and II Left slot for Type I, II and III compatible for flash memory or HDD cards USA and Canada : AC 110 to 120 V, 50/60 HZ Europe and Australia : AC 220 to 240 V, 50/60 HZ Printing : 500 WH or less Stand-by : 90 WH or less Sleep : 25 WH Printing : 55 dB A or less Stand-by : 40 dB A or less With A4 paper cassette: 396 x 400 x 389 mm (15.6 x15.7 x 15.3 inches) With Letter / Legal paper cassette: 396 x 452 x 389 mm (15.6 x18.8 x 15.3 inches) Approx. 15 kg (33 Ibs)
I-5
Relative humidity Normal (total storage time x 9/10) 35 ~ 85%RH Severe (total storage time x 1/10) High Low 85 ~ 95%RH 10 ~ 35%RH Air pressure 71.0 ~ 101.3 kPa Total storage time 0.5 years · EP-ED HC cartridge Temperature Normal (2.45 years max.) 0 ~ 35°C Severe (0.05 years max.) High Low 35°C ~ 40°C -20°C ~ 0°C Temperature change (within 3 minutes) High Low 40°C 15°C -20°C 25°C Relative humidity Normal (2.45 years max.) 35 ~ 85%RH Severe (0.05 years max.) High Low 85 ~ 95%RH 10 ~ 35%RH Air pressure 71.0 ~ 101.3 kPa Maximum total storage time: 2.5 years including used time
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.
I-6
3.2
CDRH Regulations (110 ~ 120V Model only) The center for Devices and Radiological Health (CDRH) of the US Food and Drug Administration implemented regulations for laser products on August 2, 1976. These regulations apply to laser products manufactured from August 1, 1976. Compliance is mandatory for products marketed in the United States. The label shown below indicates compliance with the CDRH regulations and must be attached to laser products marketed in the United States.
MANUFACTURED : BROTHER INDUSTRIES, LTD. 15-1, Naeshiro-cho, Mizuho-ku Nagoya 467, Japan. This product complies with FDA radiation performance standards , 21 CFR chapter 1 subchapter J.
Figure 1.2
Caution:
Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure.
3.3
Additional Information When servicing or adjusting the optical system of the printer, be careful not to place screwdrivers or other reflective objects in the path of the laser beam. Be sure to take off any personal accessories such as watches and rings before working on the printer. A reflected beam, though invisible, can permanently damage the eyes. Since the beam is invisible, the following label is attached to the inside of covers where danger of exposure to laser radiation exist.
CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK DEFEATED. AVOID DIRECT EXPOSURE TO BEAM.
CLASS 38 LASER PRODUCT. KLASSE 38 LASER.
ADVARSEL- USYNLIG LASER STRÅLING NÅR KABINETLÅGET STÅR ÅBENT. UNGDÅ DIREKTE UDSÆTTELSE FOR STRÅLING. VARNING- OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRRAR ÄR URKOPPLADE.
STRÅLEN ÄR FARLIG. KLASS 38 LASER APPARAT.
VAROI- AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE
ÄLÄ KATSO SÄTEESEEN. LUOKAN 38 LASERLAITE.
ADVARSEL- USYNLIG LASERSTRÅLING, UNNGÅ DIREKTE KONTAKT MED LASERENHETEN NÅR TOPPDEKSELET ER ÅPENT.
KLASSE 38 LASERPRODUKT.
ATTENTIGM- RADIATIONS LASER INVISIBLES QUAND OUVERT ET VERROUILLAGE ENLEVE.
EVITER EXPOSITIONS DIRECTES AU FAISCEAU. PRODUIT LASER CLASSE 38.
VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET UND
SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN. SICHERHEITSKLASSE 38.
ATTENCIÓN- RADIACIÓN LASER INVISIBLE CUANDO SE ABRE LA TAPA Y EL INTERRUPTOR
INTERNO ESTÅ ATASCADO. EVITE LA EXPOSICIÓN DIRECTA DE LOS OJOS. PRODUCTO LASER CLASE 38.
Figure 1.3
I-7
4.
4.1
PARTS OF THE PRINTER
External Views
1 2 3 4 5 6 7
Upper cover Control panel MP tray Tray 1 Power switch PCMCIA card slots Fan outlet port
8 9
10 11 12 13
14
Face-up print delivery port Centronics interface connector RS-232C interface connector USB port Duplex unit, Lower tray unit connector Rating label AC inlet
1 7
2 8
3
9
10 11
5
12
4
13
6
14
Figure 1.4
I-8
4.2
Cross Sectional View
6 2 1 7
14
3
4
5
13
8
12
11
10
9
1 2 3 4 5 6 7 8
Control panel EP-ED HC cartridge Photosensitive drum Laser unit Transfer unit Face-down tray Print-delivery path Fixing unit
9
10 11 12 13
14
Low-voltage power supply assy High-voltage power supply assy Paper cassette (Tray 1) Pick-up rollers MP tray Registration rollers
Figure 1.5
I-9
5.
STORAGE AND HANDLING OF EP-ED HC CARTRIDGES
An EP-ED HC cartridge is influenced by the storage conditions even if it is sealed in its package, so its life depends on the way in which it is used or stored. EP-ED HC cartridges should be handled carefully.
5.1
Storage of Sealed EP-ED HC Cartridges When storing sealed EP-ED HC cartridges in a warehouse or workshop, the storage conditions shown in (25) Environmental conditions on Page 1-5 must be met. Follow the instructions below: Avoid direct sunlight. Do not store cartridges on a surface that is subject to vibration. Do not hit or drop the packages containing cartridges. The cartridges should be stored horizontal when they are removed from the body (with their label side upside). 5) Avoid putting the cartridges near a CRT screen, a disk or a floppy disk (to keep their data from being destroyed). 1) 2) 3) 4)
5.2
Storage of Unsealed EP-ED HC Cartridges Each EP-ED HC cartridge contains a photosensitive drum that has an organic photoconductor (OPC) which deteriorates when exposed to strong light. It also contains toner. The user, therefore, should be fully informed about the correct storage and handling of EP-ED HC cartridges. (1) Storage requirements 1) Avoid places exposed to direct sunlight or near a window. Do not leave an EP-ED HC cartridge in a car in warm or hot weather even if it is in its storage box. 2) Avoid places with a too-high or too-cool temperature and/or humidity. Also avoid places exposed to sudden temperature or humidity changes (such as near an air conditioner outlet). 3) Avoid dusty places or places exposed to ammonia fumes or other harmful fumes. 4) Do not store an EP-ED HC cartridge in a temperature above 40°C. (2) EP-ED HC cartridge life The effective life of an EP-ED HC cartridge is 2.5 years from the date of manufacture (printed on the cartridge.) The expiry year and month (date of manufacture plus 2.5 years) is shown on the EP-ED HC cartridge box. An EP-ED HC cartridge used after the expiry may produce low-quality printing, so a cartridge should be used within the stated period.
I-10
CHAPTER II THEORY OF OPERATION
This chapter describes the printer functions, the relationship between the electrical systems and mechanical systems, and the timing of operations. Striped conduits ( ) indicate mechanical linkages; solid thin arrows ( ) appearing with a signal name indicate the transmission of single control signals and outlined thick arrows ( ) indicate the transmission of groups of signals.
1.
1.1
BASIC OPERATIONS
Mechanical Configuration The printer functions can be divided into four blocks: the laser system, the image formation system, the paper pick-up/feed system and the control system.
Expansion memory (SIMM)
Font card (2 slots)
Optional I/O (MIO)
Main PCB
Control panel
CONTROL SYSTEM
IMAGE FORMATION SYSTEM
Photosensitive drum Cleaning unit Developing unit
Laser unit
LASER SYSTEM
Transfer separation unit
Delivery rollers Fixing unit
MP tray
Feeder
Tray 1
Tray 2 (Option)
PAPER PICK-UP/FEED SYSTEM
Figure 2.1
II-1
External Device
1.2
Main Drive The power necessary for driving the printer is supplied by the main motor, the paper feed motor and the laser unit motor. The main motor is controlled by the main motor drive signal (MDRIVE) output from the main PCB, and the paper feed motor is controlled by the paper feed motor drive signal output from the main PCB, and the laser unit motor is controlled by the laser unit motor drive signal (SDRIVE) output from the main PCB.
Main motor Main motor drive signal (MDRIVE) Main PCB
Drum gear
Photosensitive drum
Fixing unit
Paper delivery rollers
Paper feed motor Paper feed motor drive signal
MP tray pick-up roller solenoid drive signal (MPSOL)
MP tray pick-up roller solenoid
MP tray pick-up roller
Tray1 pick-up roller solenoid drive signal (PUCL1)
Tray1 pick-up roller solenoid
Tray1 pick-up roller
Laser unit motor drive signal (SDRIVE)
Scanning mirror Laser unit motor Laser unit
Note: There are cases, in the following pages, that a main motor is referred to as a DC motor, but they are identical.
Figure 2.2
II-2
1.3
Basic Sequence of Operations Timing for two consecutive prints on A4 paper.
Power on
Print
WAIT
STBY
PRINT
STBY
Ready lamp
180 C control
Fixing heater
180 C control
210 C control
Main motor
Laser unit motor Paper feed motor Pick-up roller solenoid
0.18 sec 0.12 sec 1.50 sec 1.38 sec
Laser diode Registration sensor
2.54 sec
Figure 2.3
II-3
2.
LASER SYSTEM
To external device
Main PCB
SBD
DATA VOFF
Laser unit driver Collimator lens Cylindrical lens
Scanning mirror
Laser unit motor Optical sensor Focusing lenses Beam detect mirror Reflective mirror
Photosensitive drum
Figure 2.4
In response to the print signal transmitted from the external device, the main PCB generates the drive signals (DATA,VOFF) for the laser diode and sends the signals to the laser unit. The laser diode in the laser unit generates a laser beam modulated by DATA. The modulated laser beam is aligned into a parallel beam by a collimator lens and a cylindrical lens and then brought to the scanning mirror which is rotating at a constant speed. The laser beam reflected by the scanning mirror focuses on the photosensitive drum via the focusing lenses arranged in front of the scanning mirror. The path of the beam coming through the focusing lenses is reflected by the reflective mirror. As the scanning mirror rotates at a constant speed, the laser beam scans the photosensitive drum at a constant speed. As the photosensitive drum rotates at a constant speed and the laser beam scans the drum, an images is formed on the drum.
II-4
3.
3.1
IMAGE FORMATION SYSTEM
Outline The image formation system is the main part of the printer. The print information, after input from the video controller circuit into the engine controller circuit as a TVDO signal, forms a toner image on the photosensitive drum. Then the toner image is transferred onto the paper by the transfer charging roller. The image formation system is composed of the photosensitive drum the charging unit, the developing unit and the cleaning unit.
3.2
Printing Process The major part of the image formation system is contained in the cartridge, as shown in Figure 2.5.
Cartridge
Laser beam Primary charging roller
Blade
Cleaning blade Photosensitive drum
Developing cylinder Paper Transfer charging roller
Static charge eliminator
Figure 2.5 The cartridge used by the printer has a seamless photosensitive drum with the structure shown in Figure 2.6. The outer layer of the drum consists of an organic photoconductor (OPC); the base is aluminum. The printing process can be divided into five major stages:
Photoconductive layer Base
Figure 2.6 1. Electrostatic latent image formation stage Step 1 Primary charge (-) Step 2 Scanning exposure Developing stage Step 3 Development
2.
II-5
3.
Transfer stage Step 4 Transfer (+) Step 5 Separation Fixing stage Step 6 Fixing Drum cleaning stage Step 7 Drum cleaning
Electrostatic latent image formation stage
2. Scanning exposure
4.
5.
Paper path Direction of drum rotation
1. Primary charge 3. Develop ment
Developing stage
Drum cleaning stage
7. Drum cleaning
Fixing stage
Print delivery 6. Fixing
5. Separation
4. Transfer
Registration
Multi-purpose tray feed
Transfer stage
Cassette feed
Figure 2.7
3.2.1
Electrostatic latent image formation stage This stage has two steps, which together produce a pattern of electrical charges on the photosensitive drum. At the end of the stage, negative charges remain in the unexposed "dark" area. Charges are absent from the "light" areas, where the laser beam struck (exposed) the drum surface. Since this image of negative charges on the drum is invisible to the eye, it is called an "electrostatic latent image".
0 -100
Time (t)
Surface potential (V)
Exposed area -500 Unexposed area
Primary charge (step 1) Scanning exposure (step 2) Transfer (step 4) Primary charge (step 1)
Figure 2.8
II-6
Step 1 Primary charge
Primary charging roller
, ,,,,, ,,, ,,,,, ,,,, ,,,, ,,, ,,,, ,,,, ,,,, ,, ,,, ,,,, ,,,, ,, , , ,,, ,, ,,,,,,,,,,,,,, ,,,, , , , , ,,,,
AC bias
Photosensitive drum
DC bias
Figure 2.9
As preparation for latent image formation, a uniform negative potential is applied to the photosensitive drum surface. The printer uses the charging method that directly charges the drum for the primary charge. The primary charging roller consists of conductive rubber. In addition to DC bias, AC bias is applied to the primary charging roller to keep the potential on the drum surface uniform. This DC bias is changed with the developing DC bias. This charging method has advantages such as lower applied voltage, less ozone generation, etc., compared with the corona charge system.
Step 2 Scanning exposure
Laser beam
_
+
_
+
_
+
Exposed area
Unexposed area
Figure 2.10
When the laser beam scans the drum surface, it causes the charge to be neutralized in the areas struck by the beam. Areas on the drum with no charge form the electrostatic latent image.
II-7
3.2.2
Developing stage Development places particles of toner onto the areas of the drum that have been cleared of charge by the laser beam. This makes a visible image. This printer uses the toner projection development method with a single-component toner.
Step 3 Development
Blade
Photosensitive drum
Stirrer
AC bias DC bias
Developing cylinder Cylinder Magnet
Figure 2.11
Note:
The charges on the light areas on the photosensitive drum are shown as positive in this figure. Actually they are negative, but they are more positive than the developing cylinder and explanation is simplified by regarding them as positive.
As shown in Figure 2.11, the developing unit consists of a developing cylinder and rubber blade. The developing cylinder rotates around a fixed internal magnet. The singlecomponent toner consists of magnetite and a resin binder, and is held to the cylinder by magnetic attraction. The toner is an insulator, and acquires a negative charge by friction due to the rotation of the cylinder. The areas on the drum that were exposed to the laser beam have a higher potential (are less negative) than the negatively charged toner particles on the developing cylinder. When these areas approach the cylinder, the potential difference projects the toner particles onto them. This is called toner projection, and the latent image on the drum becomes visible.
Developing cylinder surface potential +V
Voltage (V)
0
Drum surface potential (exposed area) DC bias
-V Time t
Drum surface potential (unexposed area)
Figure 2.12 An AC bias is applied to the developing cylinder to help project the toner particles to the drum surface and improve the contrast of the printed image. The center voltage of the AC bias (1600 Vp-p) varies with the DC bias voltage. The IMAGE DENSITY ADJUSTMENT signal (sent from the Engine CPU to the highvoltage power supply) changes the DC bias, and thus the potential difference between the cylinder and drum. This changes the density of the print. This printer has a stirring mechanism to supply toner in the cartridge smoothly to the cylinder.
II-8
3.2.3
Transfer stage In the transfer stage, the toner image is transferred from the drum surface to the paper.
Step 4 Transfer
Photosensitive drum
Paper
Transfer charging roller
Figure 2.13 A positive charge applied to the back of the paper attracts the negatively charged toner particles to the paper. The printer accomplishes transfer by using the charging roller method. Advantages compared with the corona transfer method are as follows: · Low transfer voltage that is less than half that for corona transfer. · Less ozone generation. · The paper is supported by the transfer charging roller and photosensitive drum, so feed is more stable. Reference: If the image on the photosensitive drum is not completely transferred to the paper due to jamming, etc., the toner may adhere to the transfer charging roller. The printer removes the toner from the transfer charging roller by switching the transfer voltage between positive and negative in sequence. During wait, initial rotation, and last rotation, the printer sets the primary DC voltage to zero, and sets the charge on the drum to zero. In this case, the transfer voltage is made negative to remove the negatively-charged toner on the transfer charging roller to the drum. The transfer charging roller is thus cleaned. Step 5 Separation
Photosensitive drum
Paper
Static charge eliminator Transfer charging roller
Figure 2.14 The stiffness of the paper causes it to separate from the drum. (Curvature separation) To stabilize the paper feed and prevent small white circles from appearing in the printed image at low temperature and humidity, the charge on the back of the paper is reduced by the static charge eliminator after transfer.
II-9
3.2.4
Fixing stage The toner image transferred to the paper in the transfer stage is held only by electrostatic attraction and slight physical adhesion, so even a light touch will smear the image. In the fixing stage, the toner image is fixed by heating the paper and applying pressure. This fuses the toner particles to the paper to make a permanent image.
Step 6 Fixing
Halogen heater Upper fixing roller
Toner Paper
Lower fixing roller
Figure 2.15 The upper roller surface is PFA-coated. The upper and lower roller surfaces are grounded via a diode to prevent the negative potential of the upper roller becoming higher than that of the lower roller, resulting in the toner being drawn to the lower roller, and adhering to the lower roller surface. 3.2.5 Drum cleaning stage In the transfer stage, not all the toner is transferred to the paper. Some remains on the photosensitive drum. This residual toner is cleaned off in the drum cleaning stage so that the next print image will be clear. Step 7 Drum cleaning
Cleaning blade
Photosensitive drum
Cleaner container
Sweeper strip
Figure 2.16 Prior to the next printing, the residual toner on the drum surface is scraped away by the cleaning blade to clean the drum surface. The removed toner is collected in the cleaner container.
II-10
3.3
Operation When the engine controller circuit receives a print signal (PRINT) or a pre-feed signal (PRFD) from the video controller circuit, the engine controller circuit drives the main motor to rotate the photosensitive drum. After the drum surface is charged negatively by the primary charge roller, the laser beam modulated by a DATA signal scans the drum surface to from a latent image on the drum. The latent image formed on the drum surface is converted into a visible image by the toner on the developing cylinder and then image is transferred onto the paper by the transfer roller unit. Then the residual toner is removed from the drum surface with the cleaner blade. The cartridge also has a toner sensor. When the output from this sensor falls below a certain level, it warns that the EP-ED HC cartridge will be out of toner with an alarm.
Reflection mirror Laser unit Laser beam
Scanner motor drive signal (SDRIVE)
Laser diode drive signal (DATA)
EP-ED HC cartridge
Transfer roller
Primary charge (AC) drive (HV1AC) Main PCB Primary charge (DC) drive (HV1DC) Developing bias (AC) drive (DBAC) Developing bias (DC) drive (DBDC) Transfer charger 1 drive (HVT1) Transfer charger 2 drive (HVT2) Transfer charger 3 drive (HVT3) Transfer charger 4 drive (HVT4) Toner sensor signal 1 (TONER 1) Toner sensor signal 2 (TONER 2) High-voltage power supply PCB
Figure 2.17
II-11
4.
4.1
PAPER PICK-UP/FEED SYSTEM
Outline If a tray1 paper pick-up roller solenoid drive signal (PUCL1) is input to the circuit while the paper feed motor is rotating, the paper pick-up solenoid comes on and the paper pick-up roller solenoid is engaged. As a result, the paper pick-up roller rotates to feed paper down to the photosensitive drum. The paper position is controlled by the registration sensor so that the leading edge of the paper is aligned with the leading edge of the image on the photosensitive drum. After this operation, the paper is deliveried to the face down tray via the fixing unit. Paper ejection is detected by the paper ejection sensor; if printed paper has not reached or not cleared the paper ejection sensor in a specified time, the printer judges that a paper jam has occurred. In this case a paper jam is noticed to the external devise by a status signal.
MP tray paper empty sensor
MP tray paper empty sensor signal (PEMP)
Tray paper empty sensor
MP tray Pick-up roller solenoid
MP tray pick-up roller solenoid drive signal (MPSOL)
Tray1 Pick-up roller solenoid
Paper feed motor drive signal
Tray1 pick-up roller solenoid drive signal (PUCL1) Tray1 paper empty sensor signal (PETRAY1)
Paperfeed motor
Registration sensor signal (REGIST)
Transfer roller
Registration sensor
Main motor drive signal (MDRIVE)
Photosensitive drum
Fixing rollers
Paper ejection sensor
Paper ejection sensor signal (EJECT)
Figure 2.18
II-12
Stuck-full sensor
Main motor
Main PCB
4.2
Cassette Feed When the fixing rollers reach the specified temperature while a cassette with paper is in the printer, the READY lamp changes from flashing to lighting. When the engine controller circuit receives PRNT or PRFD signal from the video controller circuit, the paper feed motor starts rotation. About 0.2 seconds later, the printer actuates the tray1 pick-up roller solenoid and the pick-up roller makes one rotation. This feeds paper to the photosensitive drum. Timing chart for the pick-up one sheet
PRNT or PRFD STBY PRINT STBY
Main motor Paper empty sensor Paper feed motor Registration sensor Paper ejection sensor Pick-up roller solenoid
0.12 sec 0.12 sec 1.38 sec 2.54 sec
1.74 sec
Figure 2.19
II-13
4.3
MP Tray Feed The timing of the MP tray feed is identical to the timing of the cassette paper feed except for the following points: (1) The paper empty sensors are different. Cassette feed : Tray1 paper empty sensor MP tray feed : MP tray paper empty sensor The pick-up roller solenoids are different. Cassette feed : Tray1 pick-up roller solenoid MP tray feed : MP tray pick-up roller solenoid
(2)
PRNT or PRFD STBY PRINT STBY
Main motor Paper empty sensor Paper feed motor Registration sensor Paper ejection sensor Pick-up roller solenoid
0.12 sec 0.12 sec 0.65 sec
Figure 2.20
II-14
4.4
Paper Jam Detection The printer has a registration sensor and a paper eject sensor at the paper outlet to detect whether the printed paper has been fed correctly. A paper jam is detected by whether the paper is present at the sensor at the check periods programmed in the engine CPU memory. If the engine CPU detects a paper jam, the main motor, paper feed motor and scanner motor is turned off immediately and the jam status is transmitted to the video controller circuit. A paper jam is detected in any of following conditions: 1) Paper exists at the paper ejection sensor or the registration sensor when power is switched on. (JAM REAR or JAM INSIDE) 2) Paper has not reached the registration sensor within a specified time (JAM TRAYS). 3) Printed paper has not passed through the registration sensor within a specified time (JAM INSIDE (1) ). 4) Printed paper has not reached the paper ejection sensor within a specified time (JAM INSIDE (2) ). 5) Printed paper has not passed through the paper ejection sensor within a specified time (JAM REAR). Jam tray
STBY PRINT
Main motor Pick-up solenoid Registration sensor
3.00 sec 3.00 sec
Jam check
Normal
Jam
Figure 2.21 Jam inside (1)
STBY PRINT
Main motor Paper feed motor Registration sensor
2.94 sec
2.94 sec
Jam check
Normal
Jam
Figure 2.22
II-15
Jam inside (2)
STBY PRINT
Main motor Paper feed motor Paper ejection sensor
1.50 sec 1.50 sec
Jam check
Normal
Jam
Figure 2.23
Jam rear
STBY PRINT
Main motor Paper feed motor Paper ejection sensor
5.74 sec 5.74 sec
Jam check
Normal
Jam
Figure 2.24 If the stuck-full sensor detects a status that the paper is inside the printer for 20 seconds, it sends out the full signal.
II-16
CHAPTER III ELECTRICAL SYSTEM
Electric signal levels are expressed by "High" (approximate the supply voltage) or "Low" (approximate 0V). Signals with hyphen or slash, such as -FSRD or FSRD/, are low-active and signals without hyphen or slash, such as FSRD, are high-active signals.
1.
1.1
MAIN PCB
Outline The Main PCB consists of the Video Controller Circuit and the Engine Controller Circuit. The Video Controller Circuit performs the following functions. (1) Converts data received from an external device, such as a personal computer, through Centronics parallel interface or RS-232C serial interface into video data and transfers it to the Engine controller circuit. (2) Displays the current printer status in LED and LCD, and enables settings from the control panel. The operation sequence of the printer controlled by a microprocessor in the Engine Controller Circuit. The Engine Controller Circuit outputs signals to drive the various loads on the laser diode, laser unit motor, main motor, etc. according to the print commands and image data from the external device.
Main PCB
Video controller Main CPU
MB86832
USB IF
PC
CDCC (bolse) IF
ASIC MB87F1611
MASK ROM
32M mask 2 4MB
PC
RS-232C IF
PC
DRAM
16M 4 8MB
DRAM (SIMM 2 slots)
64MBmax.
EEPROM
24CO4 4Kbit
+24V Regurator IC CARD (PCMCIA) IC CARD (PCMCIA) MIO BOARD MIO RELAY (CONNECTOR) PCB
Gate Array µPD65632GF(IO PORT. ENGINE)
CONTROL PANEL
Engine controller Engine CPU
M38063
+24V +5V GND
Low-voltage Power Supply
Figure 3.1 Main PCB Block Diagram
III-1
1.2
Video Controller Circuit (1) CPU block CPU(#33) MB86832-100 manufactured by Fujitsu RISC chip Clock speed: 33.1768 Mhz (3 times faster than the base clock) Appearance: 178-pin QFP Voltage: 3V ASIC/Gate Array Block · #19 MB87F1611(Fujitsu) - 240-pin QFP Controls the address decoder, timers and interfaces (Centronics and RS-232C). · Controls HRC(High Resolution Control), GSC(Gray Scale Control) and economy mode, drivened by 3V. · #2 µPD65632GC - 100-pin QFP Controls the I/O ports and others. Font Card Block · Font Card (option) The font card has a 64MB memory area and is controlled by the 16-bit bus. The card is supplied with 12V power in the slot 2 because the PCMCIA card requires 12V power supply when writing or erasing data. The address bus is buffered by LS245 and the data bus, is buffered by LCX245. Centronics/RS-232C interface block · Centronics parallel interface Data transmission and reception are controlled by the MB87F1611 (#19). · RS-232C Data transmission and reception are controlled by the MB87F1611 (#19). The ADM202JRN (#35) serves as driver/receiver. SIMM block · SIMM (Single-Inline-Memory-Module) allows memory extension up to 72MB · 2 SIMM sockets are available. · SIMM should be of 72-pin type and its access time should be less than 70 ns. · 12 types of SIMM (1MB, 2MB, 4MB, 8MB, 16MB and 32MB) can be combined: 1MB MH25632BJ-7 (MITSUBISHI), HB56D25632B-7A (HITACHI) 2MB MH51232BJ-7 (MITSUBISHI), HB56D51232B-7A (HITACHI) 4MB MH1M32EJ-7 (MITSUBISHI), HB56A132BT-7A (HITACHI) 8MB MH2M32EJ-7 (MITSUBISHI), HB56A232BT-7A (HITACHI) 16MB THM324000BSG-60, -70, -80 (TOSHIBA) 32MB THM328020BSG-60, -70, -80 (TOSHIBA)
(2)
(3)
(4)
(5)
Note:
Fast page type and EDO type can be used together although it is not recommended.
1) The SIMMs have its printed marking on the PCB by silk screen: SLOT1 and SLOT2, respectively. 2) The attached Printer SIMM map shows the memory map for 4 SIMMs combined.
III-2
(6)
ROM block ROMs store the CPU control program and font data. ROMs are two 32Mbit masked ROMs. Optional sockets are available for two 8Mbit EPROM (µPD27C8000DZ-120 - NEC or equivalent) for expansion. ROM access time should be less than 120nsec. DRAM block DRAMs are used for receiving buffer or working area of the CPU. The DRAM block contains four 16Mbit DRAMs, thus having 8MB memory capacity in total. The refreshing method is CBR (Cas Before Ras). DRAM access time should be less than 80nsec.
(7)
III-3
0000_0000 0040_0000 0080_0000 ROM (4 bunk)
There are 4 CS terminals for CSROM#0 - CSROM#3. 2MB or 4MB is selectable from CSROM#0 - CSROM#2. If the both are selected, it will become one memory space and ROM#0 supports upto 16MB. CSROM#3 is a rest of the memory space with 256MB
0100_0000
Font card 1 (64MB) Font card 2 (16MB) $5E00_0000 Memory wait setting Memory structure setting FC control setting $5E40_0000 ROM3 (128MB) $5E60_0000 Soft support function Mediation level setting Interruption External interruption
0200_0000
$5E20_0000
0400_0000 $5E80_0000
SDRAM mode setting DRAM transfer Ghost for CS1# $5EA0_0000 LSB setting HRC/GS setting $5EC0_0000 BD $5EE0_0000 CPU $5F00_0000 Timer Engine CDCC Write to LSB
0600_0000
0800_0000 DRAM (MAX 128MB) 64MB x 8 bunk 0B00_0000 0C00_0000 Reverved (16MB x 4) MIO / EOT $5F80_0000 ASIC $5FA0_0000 $5F60_0000 $5F20_0000
Easy serial 1
16550 $5F40_0000 Switching clock Default setting
USB
0E00_0000 Ghost for CS4#
$5FE0_0000
$5FC0_0000
0FC0_0000 0FD0_0000 (256MB)
$5FFF_FFFF
Figure 3.2 Memory map
III-4
Option I/F Connector
Option ROM Socket
Centronics I/F
CPU (VIDEO) ASIC MB87F1611
USB I/F
RS232C I/F
SIMM Block
DRAM Block
MASK ROM (Flat package)
Control Panel Connector ASIC MPD65632GC PCMCIA Card Connector CPU (ENGINE)
Figure 3.4 Main PCB
III-5
1.3
Engine Controller Circuit
Laser Unit
Primary charging roller
Transfer roller High-Voltage Power Supply Assy
Developing cylinder
Toner sensor
Engine Controller Circuit
Pick-up Solenoid
MP Tray Pick-up Solenoid Paper Feeder PCB Pick-up Motor Detectors
Main Motor
Fixing Unit
Low-Voltage Power Supply Assy
Figure 3.5 Engine Controller Block Diagram Components in the Circuit (refer to the next page) A. B. C. Engine Control CPU Low-Voltage Power Supply Connector Fuser Unit Control C-1. Heater Drive Circuit C-2. Heater Temperature Input Signal C-3. Paper Eject Input Signal Paper Feeder PCB Control Signals and Connector Option Interface Circuit and Connector High-Voltage Power Supply Control Circuit and Connector Laser Unit Control G-1. Laser Unit Motor Control Circuit G-2. Laser Diode Drive PCB Control Circuit Fan Motor Drive Circuit Main Motor Control Circuit Cover Open Detect Circuit Safety Door Switch Circuit
D. E. F. G.
H. I. J. K.
III-6
2.
PAPER FEED DRIVE CIRCUIT
A. B. C. D. E. Connector to Main PCB Pick-up Motor Drive Circuit and Connector Pick-up Solenoid Drive Circuit and Connector Multi Purpose Tray Pick-up Solenoid Drive Circuit and Connector Sensors E-1. Tray1 Paper Empty Sensor E-2. Multi Purpose Tray Paper Empty Sensor E-3. Regist Sensor E-4. Pre-Regist Sensor E-5. Paper Detect Sensor in Duplex Unit Tray1 Paper Size Detect Switches
F.
Refer to the next page.
III-7
F
B
E-1
E-2
E-3
E-4
E-5
Figure 3.7 Paper Feed/Size-SW PCB Circuit
A
III-8
F
C
D
3.
3.1
DISPLAY CIRCUIT
Outline The control panel of this printer has four LED lamps, one LCD display, and eight switches. The control panel is connected to the Main PCB and its functions are as follows: (1) The LCD shows the printer status and error message in alpha-numeric characters. (2) The LED lamps indicate the operating conditions of the printer. (3) The printing mode and LCD brightness can be changed by switches.
PAD4-PAD7
LCD
LCDE, LCDRS LED4 (ONLINE) LED2 (DATA) LED5 (ONLINE) SW1 (FORMFEED) SW4 (SEL) SW2 (UP) SW5 (FONT) SW3 (DOWN) SW6 (SET) LED1 (READY) LED3 (ALARM) SW8 (CONTINUE) SW7 (MODE)
Main PCB
Figure 3.8 Display Circuit
3.2
Operation Indicators on the control panel (LED lamps and LCD) are controlled by the video controller circuit. All the switch signals are input to the video controller circuit. Signals Descriptions: LED1 - LED4 On-off control for the respective LED lamps. Illuminating when Low and extinguished when High. PAD4 - PAD7 LCD control signal. LCDRS A signal to distinguish PAD4 - PAD7 into command and data. LCDE A signal to start the operation. SW1 - SW8 Input signals from the switches. Going Low when each switch is pressed.
III-9
4.
4.1
LOW-VOLTAGE POWER SUPPLY ASSY
Outline The low-voltage power supply assy consists of the low-voltage generating block (hereinafter the DC block) and the heater drive circuit block to turn the heater on (hereinafter the AC block). When the power switch (SW1) is turned on, AC power is supplied to the low-voltage power supply assy. The DC block generates +5 VDC, and +24 VDC. When the heater is turned on, AC power is supplied to the AC block under control of the heater on-off signal from the engine controller. +24V output is reserved in the DC block, for the cooling fan for the low-voltage power supply assy.
4.2
Protection Functions Each of the power supply circuits, +5V, and +24V, has a protection function to prevent the circuit from accident by automatically cutting off the power supply in the case of a over-voltage or over-current of the load. When the cooling fan stops to rotating, an over-voltage protection or a short-circuit protection function is activated, and all the DC power supplies are cutoff. In this case check and clear the cause on the load after turning the power switch (SW1) off, and then switch the power on again at least one minute after the power shut-down.
III-10
AC IN TH1 Thermal Fuse Lamp H1
To Heater Circuit
P1 F1 L N Heater Control 1 HEAT/ 21 P101
Inlet
Figure 3.9 Low-Voltage Power Supply PCB Block Diagram
F2 L N Noise Filter Rectfier Rectfier
III-11
Feedback Control
Transformer
Power Switch (SW1)
4
+24V
Chopper
2 3 5 6 7 Over Voltage Detector
+5V +5V +24VRET ±0V ±0V
8
FANLOCK/
5.
5.1
HIGH-VOLTAGE POWER SUPPLY ASSY
Outline The High-Voltage Power Supply Assy supplies the high-voltage for the charging roller, the developer cylinder and the transfer roller according to the engine CPU's control signals. The block diagrams are shown Fig 3.10 and 3.11.
5.2
Operation of the Components of the High-Voltage Power Supply Assy (1) Primary charging When input signal/HV1AC gets the Low level, the primary high-voltage AC is applied to the primary charging roller. And when input signal/HV1DC gets the Low level, the primary high-voltage DC is applied to the primary charging roller. The primary high-voltage DC changes with developer bias DC according to values of the input signal DNSTY which is for print density adjustment. Developer bias When input signal/DBAC gets the Low level, the developer bias AC is applied to the developer cylinder. And when input signal/DBDC gets the Low level, the developer bias DC is applied to the developer cylinder. The developer bias DC changes according to values of the input signal DNSTY which is for print density adjustment, like the primary high-voltage DC. Transfer charging Transfer bias is controlled by the input signals HVT1 - 4 and HVTFB. When the input signal/HVT1 gets the Low level and the input signal HVT4 gets 3.7V, negative high-voltage is applied to the transfer roller. When the input signal/HVT2 gets the Low level, positive high-voltage is applied to the transfer roller. When the input signal/HVT3 gets the Low level, positive high-voltage about 1100 times that of the input signal HVT4 is applied to the transfer roller. The input signal HVTFB has voltage about 1/1100 times the positive voltage generated on the transfer roller. Once the engine CPU is informed of this voltage, the bias applied to the transfer roller can be known. Note: The HVT2 signal generates high-voltage irrespective of the HVT4 signal. Toner sensing Voltage levels of the input signals TONER1 and TONER2 allow the engine CPU to check if the cartridge is set or not and if toner is empty. The TONER1 carries the voltage generated at the toner sensor and the TONER2 carries the developing bias output value.
(2)
(3)
(4)
III-12
PRIMARY HIGH-VOLTAGE AC
Sin Wave Generator Current Buffer
High-Voltage Electrode P5
Control Unit (Feedback Circuit) (ON / OFF Circuit)
PRIMARY HIGH-VOLTAGE DC
Pulse Generator Current Buffer Current Buffer Control Unit (Feedback Circuit) (DNSTY Control Circuit) (ON / OFF Circuit)
PULSE P2 /HV1AC DNSTY /HV1DC /DBAC /DBDC /HVHALF 1 5 2 3 4 16
Pulse Generator
DEVELOPER BIAS AC
Current Buffer
High-Voltage Electrode P4
DBOUT
Control Unit (Feedback Circuit) (ON / OFF Circuit)
DEVELOPER BIAS DC PULSE
Current Buffer Current Buffer Control Unit (Feedback Circuit) (DNSTY Control Circuit) (ON / OFF Circuit)
Figure 3.10 High-Voltage Power Supply Block Diagram 1
III-13
TRANSFER HIGH-VOLTAGE
Pulse Generator Current Buffer
High-Voltage Electrode P1
Attenuator
Current Buffer
Constant Current Control Unit (Feedback Circuit) (ON / OFF Circuit)
/HVT3 /HVT2 HVTFB HVT4 /HVT1 TONER1 TONER2 0V 24VRET +24V
P2 8 7 10 9 6 11 13 12 14 15
Pulse Generator Current Buffer (HVT4 Control Circuit) Constant Voltage Control Unit
TONER SENSE
Toner Sense Control Unit (Toner 1 Circuit) (Toner 2 Circuit) Toner Sense Electrode P3
DBOUT
Figure 3.11 High-Voltage Power Supply Block Diagram 2
III-14
CHAPTER IV MECHANICAL SYSTEM
s Safety Precautions To prevent the creation of secondary problems by mishandling, observe the following precautions during maintenance work. (1) Always turn off the power before replacing parts or units. When having access to the power supply, be sure to unplug the power cord form the power outlet. (2) Be careful not to lose screws, washers, or other parts removed for parts replacement. (3) Be sure to apply grease to the teeth of gears. (4) When using soldering irons and other heat-generating tools, take care not to damage the resin parts such as wires, PCBs, and covers. (5) Before handling the PCBs, touch a metal portion of the equipment to discharge static electricity, or the electronic parts may be damaged due to the electricity charged in your body. (6) When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil. (7) Be sure to reinsert self-tapping screws correctly, if removed. (8) Unless otherwise specified, tighten screws to the torque values listed below. · Tapping screws S tight M3 B tight M3 x 6 M3 x 8 · Stepped screws M3 M4 (9) 7kgf · cm 5kgf · cm 7kgf · cm 7kgf · cm 10kgf · cm
: : :
: :
(10)
When connecting or disconnecting cable connectors, hold the connector bodies not the cables. If the connector has a lock, always slide the connector lock to unlock it. After repairs, check not only the repaired portion but also that the connectors and other related portions function properly before operation checks. · On the next page is a disassembly order flow which helps you access the object component. · Unless otherwise specified, the disassembled parts or components should be reassembled in the reverse order of removal.
s Notes
IV-1
Printer body
Upper cover Font cover ASSY Front cover Side cover R Side cover L Paper feed chassis unit PS switch wire Remote switch
Control panel unit Side cover L
Toner cartridge lid
Upper cover ASSY
*Toner cartridge Paper tray Separation pad ASSY MP PE sub actuator MP tray cover MP tray ASSY
s PRINTER DISASSEMBLING PROCEDURE
Rear cover ASSY
Fixing unit
Laser unit
IV-2
DC fan motor P feed/size-SW PCB ASSY Size -switch spring Paper path separation plate Latch DC gear holder ASSY Main PCB Regist sensor actuator PE sensor actuator Tray sensor holder
Font cover ASSY Side cover R
Transfer unit
Cartridge stopper ASSY
High-voltage power supply unit
Low-voltage power supply unit
Roller holder
Paper pick-up roller
Paper feed motor ASSY
PRINTER BODY
1.1 Configuration
Upper cover ASSY Control panel unit Toner cartridge lid
Paper tray Side cover L Font cover ASSY Rear cover ASSY Side cover R
Figure 4.1
1.2
Control Panel Unit (1) Release the Stopper. (2) Remove the Lead wire cover. (3) Remove the 3 screws from the bottom of the Control panel unit, and r