Brother HL-1260 User manual

SERVICE MANUAL
MODEL:HL-1260
R
LASER PRINTER

No part this publication may be reproduced in any form or by any means without permission in writing
from the publisher.
Trademarks:
• BR-Script, and DX-1200 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 4 are registered trademarks of Hewlett Packard Company.

This service manual contains basic information required for after-sales service of the laser printer
(hereinafterreferredtoas”thismachine”or”theprinter”).Thisinformationisvitaltotheservicetechnician
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 : Engine Block Diagram, 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
informationbulletins,isrequiredformaintainingitsqualityperformanceandforfosteringthepracticalability
to find the cause of troubles.
PREFACE

i
CONTENTS
CHAPTER I GENERAL
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. STORAGEAND HANDLING OF EP-ED CARTRIDGES.................................................. I-10
5.1 Storage of Sealed EP-ED Cartridges..................................................................... I-10
5.2 Storage of Unsealed EP-ED Cartridges................................................................. I-10
CHAPTER II THEORY OF OPERATION
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 Transferstage ...........................................................................................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 MPTray Feed ........................................................................................................II-14
4.4 Paper Jam Detection.............................................................................................II-15

ii
CHAPTER III ELECTRICAL SYSTEM
1. MAIN PCB........................................................................................................................ III-1
1.1 Outline.................................................................................................................... III-1
1.2 Video Controller Circuit ..........................................................................................III-2
1.3 Engine Controller Circuit ........................................................................................III-7
2. PAPER FEED DRIVE CIRCUIT ....................................................................................... III-9
3. DISPLAY CIRCUIT .........................................................................................................III-11
3.1 Outline..................................................................................................................III-11
3.2 Operation .............................................................................................................III-11
4. LOW-VOLTAGE POWER SUPPLYASSY.......................................................................III-12
4.1 Outline..................................................................................................................III-12
4.2 Protection Functions ............................................................................................III-12
5. HIGH-VOLTAGE POWER SUPPLYASSY......................................................................III-14
5.1 Outline..................................................................................................................III-14
5.2 Operation of the Components of the High-Voltage Power Supply Assy ...............III-14
CHAPTER IV MECHANICAL SYSTEM
PRINTER DISASSEMBLING PROCEDURE
PRINTERBODY
1.1 Configuration.......................................................................................................... IV-3
1.2 Toner Cartridge Lid ................................................................................................IV-3
1.3 Side Cover L .......................................................................................................... IV-3
1.4 Font Cover Assy..................................................................................................... IV-4
1.5 Upper Cover Assy, Rear Cover Assy......................................................................IV-4
1.5.1 Upper cover assy, rear cover assy ...........................................................IV-4
1.5.2 Changeover guide, jam remove cover......................................................IV-5
1.6 Side Cover R..........................................................................................................IV-5
1.7 DC Fan Motor......................................................................................................... IV-6
1.8 Main PCB...............................................................................................................IV-6
1.9 Control Panel Unit .................................................................................................. IV-8
1.10 Scanner Unit .......................................................................................................... IV-9
1.11 Cartridge Stopper Assy..........................................................................................IV-9
1.12 Paper Feed Chassis Unit .....................................................................................IV-10
1.13 Separation Pad Assy............................................................................................IV-11
1.14 MP PE Sub Actuator ............................................................................................ IV-12
1.15 P Feed /Size-SW PCB Assy................................................................................. IV-12
1.16 Side-Switch Spring...............................................................................................IV-12
1.17 Regist Sensor Actuator ........................................................................................IV-13
1.18 MP Paper Detection Actuator...............................................................................IV-13
1.19 PE Sensor Actuator MP ....................................................................................... IV-13
1.20 Tray Sensor Holder .............................................................................................. IV-14
1.21 Roller Holder ........................................................................................................IV-14
1.22 Paper Pick-up Roller Assy, Bearing...................................................................... IV-15
1.23 Paper Pick-up Solenoid........................................................................................IV-16
1.24 Paper Feed Motor Assy........................................................................................IV-16
1.25 MPTray Cover...................................................................................................... IV-17
1.26 MP TrayAssy .......................................................................................................IV-17
1.27 Paper Path Separation Plate, Paper Path Separation Film .................................. IV-18
1.28 Latch .................................................................................................................... IV-19
1.29 Fixing Unit (for both 120V and 230V, the only difference is the halogen heater). IV-19
1.30 TransferUnit......................................................................................................... IV-22

iii
1.31 DC Gear Holder Assy........................................................................................... IV-23
1.32 PS Switch Wire, Remote Switch .......................................................................... IV-23
1.33 High-Voltage Power Supply PCB Assy................................................................. IV-24
1.34 Low-Voltage Power Supply PCB Assy.................................................................. IV-24
1.35 Toner Cartridge (EP-ED Cartridge) ...................................................................... IV-25
1.36 PaperTray ............................................................................................................ IV-25
CHAPTER V MAINTENANCE AND SERVICING
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
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 PAPERTRANSPORT PROBLEMS ...........................................VI-19
5.1 Paper Jams ..........................................................................................................VI-19
5.2 Incomplete Paper Feed ........................................................................................VI-22
6. OPERATION ..................................................................................................................VI-23
6.1 Line Inspection Mode Procedure .........................................................................VI-23
6.2 DRAM Test ...........................................................................................................VI-25
7. STATUS MESSAGE LIST............................................................................................... VI-26
APPENDICES
1. Engine Block Diagram....................................................................................................... A-1
2. Paper Feed/Size-SW PCB Circuitry Diagram (1/1)............................................................ A-2
3. Main PCB Circuitry Diagram (1/8) ..................................................................................... A-3
4. Main PCB Circuitry Diagram (2/8) ..................................................................................... A-4
5. Main PCB Circuitry Diagram (3/8) ..................................................................................... A-5
6. Main PCB Circuitry Diagram (4/8) ..................................................................................... A-6
7. Main PCB Circuitry Diagram (5/8) ..................................................................................... A-7
8. Main PCB Circuitry Diagram (6/8) ..................................................................................... A-8
9. Main PCB Circuitry Diagram (7/8) ..................................................................................... A-9
10. Main PCB Circuitry Diagram (8/8) ................................................................................... A-10
11. Control Panel PCB Circuitry Diagram (1/1) ..................................................................... A-11
12. Scanner LD PCB Circuitry Diagram (1/1) ........................................................................ A-12

I- 1
CHAPTER IGENERAL
1. FEATURES
A. This high-speed, non-impact (low-noise) printer is based on electrophotography, electronics
and laser technology.
B. 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.
C. The charging roller, developing cylinder, photosensitive drum and cleaner of the printer
are combined into a single assembly called an ”EP-ED 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.
D. Laser beam safety is designed into the printer. The printer is approved by the US Center
for Devices and Radiological Health (CDRH).
E. Paper can be fed in two ways, by the multi-purpose paper feed tray and paper cassette.
F. Maintenance is easy with print component units which are directly detachable, and they
require no adjustment after reassembly.
2. SPECIFICATIONS
(1) Type Desktop page printer
(2) Printing method Electrophotography (single-component dry toner)
(3) Printing speed
Cassette feed 12 pages/minute (A4/Letter size by cassette feed)
10.2 pages/minute (Legal size)
(4) First print time Approx. 20 seconds
(A4 size by face-down print delivery from the paper cassette)
(5) Warm-up (WAIT) time Max. 1 minute at 20°C (68°F)
(6) Optical system
Laser Semiconductor laser
Output power : 5mW max.
Wave length : 780 nm
Scanning system Rotating six-faced polygon mirror
(7) Resolution
Horizontal 600 dots/inch and high resolution control (HRC)
Vertical 600 raster lines/inch

I - 2
(8) Printing system
Photosensitive drum OPC
Charging Charging Roller
Exposure Laser scanning system
Development Toner projection development system
Paper feed Cassette or manual feed
Image transfer Roller method
Separation Natural(utilizing a small drum radius), Static charge eliminator
Fixing Heated fixing roller
Toner supply Included in the replaceable EP-ED cartridge
Life expectancy 6000 pages/cartridge
(9) Paper
Cassette feed Plain paper for Letter, Legal, A4, ISO B5, A5, ISO B6, A6,
Executive (A4 or letter size paper with the print density set at
level 8 with 4% coverage, recommended: 60 g/m 105 g/m )
and Envelope (com10, monarch, C5, DL, ISO B5)
Multi-purpose Tray Plain paper of 90 x 148 mm 216 x 356 mm (recommended:
60g/m 135 g/m , overhead projector (OHP) film, postcards,
label stock and envelopes (specified sizes)
(10) Cassette (Tray 1)
Universal cassette A4, Letter, Legal, ISO B5, Executive, A5, ISO B6, and A6
Maximum load height 55 mm (500 sheets of 80 g/m paper)
Feedable paper type 60 105 g/m
Envelopes 40 envelopes
(11) Print delivery Face-down or (face-up)
(12) Print delivery tray capacity
Face-down 250 sheets (80 g/m )
Face-up Discharge only
2
2
22
2
2
2

I- 3
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.
SIZE A (mm) B (mm) C (mm) D (mm)
COM-10
MONARCH
DL
B5 (ISO)
C5
104.8 241.3 96.3 232.8
98.4 190.5 89.9 182.0
110.1 221.0 101.6 212.5
162.2 228.6 154.1 220.1
176.0 250.0 167.5 241.5
E (mm)
4.23 ± 1.0
4.23 ± 1.0
4.23 ± 1.0
4.23 ± 1.0
4.23 ± 1.0
SIZE A (mm) B (mm) C (mm) D (mm)
A 4
Letter
Legal
Executive
B 6 (ISO)
A 6
B 5 (ISO)
A 5
210.0 297.0 203.2 288.5
215.9 279.4 207.4 270.9
215.9 355.6 207.4 347.1
176.0 250.0 167.5 241.5
184.2 266.7 175.7 258.2
148.0 210.0 139.5 201.5
125.0 176.0 116.5 167.5
105.0 148.0 96.5 139.5
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
(The sizes above are nominal sizes according to ISO.)
An A4 sheet accepts 80 PICA-pitch characters (203.2mm).
(13) Effective printing area
Printable area
E
D
B
CE
E
A
E
Figure 1.1 Printable Area
Table 1.2 Envelope
Table 1.1 Plain Paper

I - 4
(14) Standard interfaces Automatic interface selection
• Centronics, Bi-directional parallel
• RS-232C serial
Baud rate : 150, 300,1200, 2400, 4800, 9600
19200, 38400, 57600 bps
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
(15) Emulation Automatic emulation selection
• HP Laser Jet 4 (PCL Level 5e)
• EPSON FX-850
• IBM Proprinter XL
• BR-Script level 2 (PostScript language emulation interpreter)
• HP- GL
(16) CPU 79R3041 (20MHZ)
(17) Resident fonts 75 scalable fonts and 12 bitmapped fonts
HP Laser Jet 4, 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
Bitmapped Fonts (Portrait and Landscape):
• Letter Gothic 16.66 Medium, Italic, Bold, Bold Italic
• OCR-A
• OCR-B
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

I- 5
(18) RAM 2M bytes (expandable to 26M bytes)
(19) Font cartridge/card slots Two slots
One font cartridge slot and one font card slot
(20) Power souse USA and Canada : AC 110 to 120 V, 60 HZ
Europe and Australia : AC 220 to 240 V, 50 HZ
(21) Power consumption Printing : 500 WH or less
Stand-by : 80 WH or less
Sleep : 20 WH
(22) Noise Printing : 49 dB A or less
Stand-by : 40 dB A or less
(23) Dimensions (W x H x D) 371.6 x 326.5 x 393 mm (14.6 x12.9 x 15.5 inches)
(24) Weight Approx. 15 kg (32.6 Ibs)
(25) Environmental conditions
Operating Temperature 10 ~ 32.5°C
environment Relative humidity 20 ~ 80%RH
(No condensation allowed)
Air pressure 613 ~ 1013 hPa
(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
• Albertville, Extrabold
• Antique Oakland, Oblique, Bold
• Cleveland Condensed
• Conecticut
• 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
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

I - 6
• EP-ED 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 613 ~ 1013 hPa
Maximum total storage time: 2.5 years including used time
3. SAFETY INFORMATION
3.1 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.
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 613 ~ 1013 hPa
Total storage time 0.5 years

I- 7
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.
Caution: Use of controls, adjustments or performance of procedures other than those
specified in this manual may result in hazardous radiation exposure.
Figure 1.2
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.
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.
Figure 1.3

I - 8
9 AC inlet
10 Face-up print delivery port
11 Fan outlet port
12 Rating label
13 Optional I/O slot
14 RS-232C interface connector
15 Centronics interface connector
16 Optional interface connector
4. PARTS OF THE PRINTER
4.1 External Views
1 Upper cover
2 Control panel
3 MP tray
4 Tray 1
5 Tray 2 (Option)
6 Font card slot
7 Font cartridge slot
8 Power switch
2
4
10
11
6
3
8
5
7
1
9
15
13
16
12
14
Figure 1.4

I- 9
1 Registration rollers
2 EP-ED cartridge
3 Photosensitive drum
4 Laser scanner unit
5 Transfer unit
6 Face-down tray
7 Print-delivery path
8 Fixing unit
9 Low-voltage power supply assy
10 High-voltage power supply assy
11 Paper cassette (Tray 1)
12 Pick-up rollers
13 MP tray
14 Control panel
9
13
8
12345
12
11
7
6
10
4.2 Cross Sectional View
14
Figure 1.5

I - 10
5. STORAGE AND HANDLING OF EP-ED CARTRIDGES
An EP-ED 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 cartridges should be
handled carefully.
5.1 Storage of Sealed EP-ED Cartridges
When storing sealed EP-ED 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:
1) Avoid direct sunlight.
2) Do not store cartridges on a surface that is subject to vibration.
3) Do not hit or drop the packages containing cartridges.
4) 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).
5.2 Storage of Unsealed EP-ED Cartridges
Each EP-ED 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
cartridges.
(1) Storage requirements
1) Avoid places exposed to direct sunlight or near a window. Do not leave an EP-ED
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 cartridge in a temperature above 40°C.
(2) EP-ED cartridge life
The effective life of an EP-ED 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 cartridge box. An EP-ED cartridge used after the expiry
may produce low-quality printing, so a cartridge should be used within the stated
period.

II - 1
CHAPTER II THEORY OF OPERATION
Thischapterdescribestheprinterfunctions,therelationshipbetweentheelectricalsystemsand
mechanicalsystems,andthetimingofoperations.Stripedconduits( )indicatemechanical
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. BASIC OPERATIONS
1.1 Mechanical Configuration
The printer functions can be divided into four blocks: the laser/scanner system, the image
formation system, the paper pick-up/feed system and the control system.
Figure 2.1
Expansion memory
(SIMM)
Font cartridge/card Optional I/O
(MIO)
External Device
Control panel
IMAGE FORMATION SYSTEM
Cleaning unit
Photosensitive drum
Developing
unit
Laser/scanner
unit
LASER/SCANNER
SYSTEM
Transfer
separation
unit
Delivery rollers
Fixing unit
Feeder
Tray 1
Tray 2
(Option)
MP tray
Main PCB
CONTROL SYSTEM
PAPER PICK-UP/FEED SYSTEM

II - 2
1.2 Main Drive
Thepowernecessaryfor drivingtheprinterissupplied bythemainmotor,the paperfeedmotor
and the scanner 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
themainPCB,andthe scanner motoriscontrolledbythescanner motor drivesignal(SDRIVE)
output from the main PCB.
Figure 2.2
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
Scanner motor drive signal (SDRIVE)
Scanner motor
Scanning mirror
Scanner unit
Note: There are cases, in the following pages, that
a main motor is referred to as a DC motor, but
they are identical.

II - 3
1.3 Basic Sequence of Operations
Timing for two consecutive prints on A4 paper.
Power on Print
WAIT STBY PRINT
Ready lamp
Fixing heater
Main motor
170°C control 190°C
STBY
control 170°C control
Scanner motor
Paper feed
motor
Pick-up roller
solenoid
Laser diode
Registration
sensor
0.2 sec 0.2 sec 2.5 sec 2.3 sec
4.24 sec
Figure 2.3

II - 4
2. LASER/SCANNER SYSTEM
Inresponsetotheprintsignaltransmittedfromtheexternaldevice,themainPCBgeneratesthe
drive signals (DATA,VOFF) for the laser diode and sends the signals to the scanner unit.
The laser diode in the scanner 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.
Asthephotosensitivedrumrotatesataconstantspeedandthe laser beam scans the drum, an
images is formed on the drum.
Scanner driver
Collimator lens
Cylindrical lens
Scanner motor
Scanning mirror
Focusing lenses
Beam detect mirror
Optical sensor
To external device
Main PCB
SBD DATA VOFF
Figure 2.4