Brother HL-1660e Series User manual

No part this publication may be reproduced in any form or by any means without permission in writing
fromthepublisher.
Trademarks:
• BR-Script, and DX-1600 are registered trademarks of Brother Industries, Ltd.
• Centronicsis aregistered trademarkof GenicomCorporation.
• 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.

Thisservicemanualcontainsbasicinformationrequiredforafter-salesserviceofthelaserprinter(hereinafter
referredtoas”thismachine”or”theprinter”).Thisinformationisvitaltotheservicetechnicianinmaintaining
thehigh printingqualityand performanceof the printer.
This manual consists of the following chapters:
ChapterI: General
Features, specifications, etc.
ChapterII : TheoryofOperation
Basic operation of the mechanical system and the electrical system, and their timing.
ChapterIII : Electrical System
Theory of the electronics circuit
ChapterIV : Mechanical System
Requirementsforasuitablelocation,disassemblingandreassemblingprocedureof
mechanical system.
ChapterV: MaintenanceandServicing
Parts replacement schedule, list of tools, lubricants and cleaners.
ChapterVI : Troubleshooting
Referencevaluesandadjustment,troubleshootingforimagedefects,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 IGENERAL
1. FEATURES ..........................................................................................................................I-1
2. SPECIFICATIONS ...............................................................................................................I-1
3. SAFETYINFORMATION .....................................................................................................I-6
3.1 Laser Safety (110 - 120V Model only) ........................................................................ I-6
3.2 CDRHRegulations (110-120V Modelonly) ...............................................................I-7
3.3 AdditionalInformation ................................................................................................I-7
4. PARTS OFTHE PRINTER...................................................................................................I-8
4.1 External Views...........................................................................................................I-8
4.2 Cross SectionalView.................................................................................................I-9
5. STORAGEANDHANDLING OFEP-EDCARTRIDGES..................................................... I-10
5.1 Storageof SealedEP-ED Cartridges .......................................................................I-10
5.2 Storageof UnsealedEP-ED Cartridges ...................................................................I-10
CHAPTER II THEORY OF OPERATION
1. BASICOPERATIONS........................................................................................................ II-1
1.1 MechanicalConfiguration ......................................................................................... II-1
1.2 MainDrive ............................................................................................................... II-2
1.3 BasicSequence ofOperations ................................................................................ II-3
2. LASER/SCANNERSYSTEM............................................................................................. II-4
3. IMAGEFORMATIONSYSTEM ......................................................................................... II-5
3.1 Outline..................................................................................................................... II-5
3.2 PrintingProcess ...................................................................................................... II-5
3.2.1 Electrostatic latent image formation stage................................................. II-6
3.2.2 Developingstage ....................................................................................... II-8
3.2.3 Transferstage............................................................................................ II-9
3.2.4 Fixing stage..............................................................................................II-10
3.2.5 Drumcleaning stage.................................................................................II-10
3.3 Operation ................................................................................................................II-11
4. PAPER PICK-UP/FEED SYSTEM ....................................................................................II-12
4.1 Outline....................................................................................................................II-12
4.2 CassetteFeed ........................................................................................................ II-13
4.3 MPTray Feed .........................................................................................................II-14
4.4 PaperJam Detection ..............................................................................................II-15

ii
CHAPTER III ELECTRICAL SYSTEM
1. MAIN PCB........................................................................................................................ III-1
1.1 Outline.................................................................................................................... III-1
1.2 VideoController Circuit ........................................................................................... III-2
1.3 EngineController Circuit ......................................................................................... III-7
2. PAPER FEED DRIVE CIRCUIT........................................................................................ III-9
3. DISPLAYCIRCUIT ..........................................................................................................III-11
3.1 Outline...................................................................................................................III-11
3.2 Operation ...............................................................................................................III-11
4. LOW-VOLTAGEPOWER SUPPLYASSY.........................................................................III-12
4.1 Outline...................................................................................................................III-12
4.2 Protection Functions..............................................................................................III-12
5. HIGH-VOLTAGEPOWER SUPPLYASSY .......................................................................III-14
5.1 Outline...................................................................................................................III-14
5.2 Operationof theComponents ofthe High-Voltage PowerSupplyAssy ..................III-14
CHAPTER IV MECHANICAL SYSTEM
PRINTERDISASSEMBLING PROCEDURE
PRINTERBODY
1.1 Configuration........................................................................................................... IV-3
1.2 TonerCartridgeLid.................................................................................................. IV-3
1.3 SideCover L........................................................................................................... IV-3
1.4 Font Cover Assy..................................................................................................... IV-4
1.5 Upper CoverAssy, Rear CoverAssy ...................................................................... IV-4
1.5.1 Upper cover assy, rear cover assy ........................................................... IV-4
1.5.2 Changeoverguide, jamremovecover ....................................................... IV-5
1.6 SideCover R .......................................................................................................... IV-5
1.7 DCFanMotor ......................................................................................................... IV-6
1.8 MainPCB ............................................................................................................... IV-6
1.9 ControlPanelUnit ................................................................................................... IV-8
1.10 ScannerUnit ........................................................................................................... IV-9
1.11 Cartridge StopperAssy .......................................................................................... IV-9
1.12 PaperFeed ChassisUnit .......................................................................................IV-10
1.13 Separation PadAssy .............................................................................................IV-11
1.14 MP PE Sub Actuator .............................................................................................IV-12
1.15 P Feed /Size-SW PCB Assy .................................................................................IV-12
1.16 Side-SwitchSpring ................................................................................................IV-12
1.17 RegistSensor Actuator..........................................................................................IV-13
1.18 MP Paper DetectionActuator.................................................................................IV-13
1.19 PE Sensor Actuator MP ........................................................................................IV-13
1.20 TraySensorHolder ................................................................................................IV-14
1.21 RollerHolder ..........................................................................................................IV-14
1.22 Paper Pick-up RollerAssy, Bearing........................................................................IV-15
1.23 PaperPick-up Solenoid..........................................................................................IV-16
1.24 Paper Feed MotorAssy .........................................................................................IV-16
1.25 MPTrayCover .......................................................................................................IV-17
1.26 MP Tray Assy ........................................................................................................IV-17
1.27 Paper PathSeparation Plate, PaperPath SeparationFilm ......................................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 HolderAssy ............................................................................................IV-23
1.32 PS Switch Wire, Remote Switch ............................................................................IV-23
1.33 High-Voltage PowerSupply PCBAssy...................................................................IV-24
1.34 Low-Voltage PowerSupply PCBAssy ...................................................................IV-24
1.35 Toner Cartridge (EP-EDCartridge) .........................................................................IV-25
1.36 PaperTray ..............................................................................................................IV-25
CHAPTER VMAINTENANCE AND SERVICING
1. PERIODICALREPLACEMENT PARTS ............................................................................. V-1
2. CONSUMABLEPARTSSTANDARDENDURANCETABLE ............................................... V-1
3. LISTOFSTANDARDTOOLS ............................................................................................. V-2
4. LISTOFLUBRICANTS ANDCLEANERS ......................................................................... V-3
CHAPTER VI TROUBLESHOOTING
1. INTRODUCTION ............................................................................................................... VI-1
1.1 Initial Check............................................................................................................ VI-1
1.2 BasicProcedure ..................................................................................................... VI-2
2. TESTPRINTING ANDMECHANICALCHECK ................................................................. VI-2
2.1 Test Printing............................................................................................................ VI-2
3. IMAGE DEFECTS ............................................................................................................ VI-3
3.1 Image Defect Examples ......................................................................................... VI-3
3.2 TroubleshootingImage Defects ............................................................................... VI-4
4. TROUBLESHOOTINGOF MALFUNCTIONS .................................................................. VI-11
5. TROUBLESHOOTINGPAPERTRANSPORT PROBLEMS............................................. VI-19
5.1 PaperJams .......................................................................................................... VI-19
5.2 Incomplete PaperFeed ......................................................................................... VI-22
6. OPERATION ................................................................................................................... VI-23
6.1 LineInspection ModeProcedure........................................................................... VI-23
6.2 DRAMTest ........................................................................................................... VI-25
7. STATUS MESSAGE LIST............................................................................................... VI-26
APPENDICES
1. EngineBlock Diagram ....................................................................................................... A-1
2. PaperFeed/Size-SW PCBCircuitryDiagram (1/1) ............................................................. A-2
3. MainPCB CircuitryDiagram (1/7) ...................................................................................... A-3
4. MainPCB CircuitryDiagram (2/7) ...................................................................................... A-4
5. MainPCB CircuitryDiagram (3/7) ...................................................................................... A-5
6. MainPCB CircuitryDiagram (4/7) ...................................................................................... A-6
7. MainPCB CircuitryDiagram (5/7) ...................................................................................... A-7
8. MainPCB CircuitryDiagram (6/7) ...................................................................................... A-8
9. MainPCB CircuitryDiagram (7/7) ...................................................................................... A-9
10. ControlPanel PCBCircuitryDiagram (1/1) ....................................................................... A-10
11. ScannerLD PCBCircuitry Diagram (1/1).......................................................................... A-11

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) Standardinterfaces Automatic interface selection
• Centronics,Bi-directional parallel
• RS-232C serial
Baudrate : 150,300,1200,2400,4800,9600
19200,38400,57600bps
Stop bit : 1 bit
Start bit : 1 bit or 2 bits
Datalength : 7 bits or 8 bits
Parity : Odd,Even, orNone
Protocol : Xon/Xoffor DTR
(15) Emulation Automaticemulation selection
• HP Laser Jet 5 (PCL Level 6)
• EPSON FX-850
• IBM Proprinter XL
• BR-Scriptlevel 2(PostScript languageemulation interpreter)
• HP- GL
(16)CPU MB86832
(17)Residentfonts 75 scalable fonts and 12 bitmapped fonts
HP Laser Jet 5, EPSON FX-850, IBM Proprinter XL
Scalable Fonts:
IntellifontCompatibleFonts:
• Albertville,Extrabold
• AntiqueOakland,Oblique,Bold
• Brougham,Oblique,Bold,
BoldOblique
• ClevelandCondensed
• Connecticut
• Guatemala Antique, Italic, Bold,
Bold Italic
• Letter Gothic, Oblique, Bold
• Maryland
• Oklahoma, Oblique, Bold,
BoldOblique
• PC Brussels Light, Light Italic, Demi,
Demi Italic
• PC Tennessee Roman, Italic, Bold,
Bold Italic
• Utah, Oblique, Bold, Bold Oblique
• Utah Condensed, Oblique, Bold,
BoldOblique
BitmappedFonts(PortraitandLandscape):
• Letter Gothic 16.66 Medium, Italic, Bold, Bold Italic
• OCR-A
• OCR-B
Windows3.1CompatibleFonts:
• Tennessee Roman, Italic, Bold,
Bold Italic
• Helsinki, Oblique, Bold, Bold Oblique
• BR Symbol
• WDingbats
BR-Script Fonts:
• Atlanta Book, Book Oblique, Demi,
DemiOblique
• Copenhagen Roman, Italic, Bold,
Bold Italic
• Portugal Roman, Italic, Bold, Bold Italic
• Calgary Medium Italic
BrotherOriginalFonts:
• Bermuda Script
• Germany
• San Diego
• USRoman

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) Powersouse USAandCanada : AC 110 to 120 V, 60 HZ
EuropeandAustralia : AC 220 to 240 V, 50 HZ
(21) Powerconsumption Printing(peak) 115V/230V : 640 WH/1.010 WH or less
Printing(average): 500 WH or less
Stand-by : 80 WH or less
Sleep : 20 WH or less
Note:
- The peak figure of power consumption is worked out when the halogen heater lamp is
turned ON.
- The peak figure of power consumption is worked out excluding inrush current value.
- Be sure that the peak figure of power consumption is reference value and should be
used inside the Brother offices only.
(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) Environmentalconditions
Operating Temperature10 ~ 32.5°C
environment Relativehumidity 20~ 80%RH
(Nocondensationallowed)
Airpressure 613 ~ 1013 hPa
(0 ~ 2,500 m above sea level)
Non-operating Temperature0 ~ 35°C
environment Relativehumidity 10~ 80%RH
(Nocondensationallowed)
Storageconditions
• Printer Temperature
• 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-ScriptLevel 2Mode
Scalable Fonts:
• Atlanta Book, Book Oblique, Demi,
DemiOblique
• Brussels Light, Light Italic, Demi,
Demi Italic
• Brougham, Oblique, Bold, Bold Oblique
• Helsinki, Oblique, Bold, Bold Oblique
• Helsinki Narrow, Oblique, Bold,
BoldOblique
• 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
PR99017

I - 6
• EP-ED cartridge Temperature
Normal(2.45yearsmax.)
0 ~ 35°C
Severe(0.05 yearsmax.)
High Low
35°C ~ 40°C -20°C ~ 0°C
Temperaturechange(within3minutes)
High Low
40°C 15°C -20°C 25°C
Relativehumidity
Normal(2.45yearsmax.)
35~ 85%RH
Severe(0.05 yearsmax.)
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
HumanServices(DHHS)RadiationPerformanceStandardaccordingtotheRadiationControl
for Health and Safety Act of 1968. This means that the printer does not produce hazardous
laserradiation,
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
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
Temperaturechange(within3minutes)
High Low
60°C 15°C -20°C 25°C
Relativehumidity
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
Thepowernecessary fordriving theprinteris suppliedby themain motor,thepaper feedmotor
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
themain PCB, andthescanner motoris controlledby thescanner motordrivesignal (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
0.15 sec 0.15 sec 1.88 sec 1.73 sec
3.18 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.
Asthe photosensitivedrumrotates ataconstant speedandthe laserbeamscans thedrum,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