Brother HL 2060 - B/W Laser Printer User manual

MECHANICS & ELECTRONICS
SERVICE MANUAL
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, 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.

i
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

ii
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 Configuration.................................................................................................................... IV-3
1.2 Control Panel Unit............................................................................................................ IV-3
1.3 Toner Cartridge Lid..........................................................................................................IV-3
1.4 Side Cover L .................................................................................................................... IV-4
1.5 Font Cover Assy .............................................................................................................. IV-5
1.6 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

iii
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

iv
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

I-1
CHAPTER I GENERAL
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 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.
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 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)
(4) First print time 16 seconds or less
(A4 size by face-down print delivery from the paper cassette)
Prestart by software command for 10 second first print
(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 1,200 dots/inch
Vertical 600 raster lines/inch and 1,200 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 HC cartridge
Life expectancy 9,000 pages/cartridge
(9) Paper
Cassette feed Plainpaper for Letter, Legal, A4 (A4 or letter size paper
with the print density set at level 8 with 5% coverage,
recommended: 60 g/m2- 105 g/m2)
Multi-purpose Tray Plain paper of 95 x 148 mm - 216 x 356 mm
(recommended: 60g/m2- 200 g/m2, overhead
projector (OHP) film, postcards, label stock and
envelopes (specified sizes)
(10) Cassette (Tray 1)
Paper cassette A4
Letter / Legal
Universal (Option) : A4, Letter, Legal, Executive, ISO
B5, A5, ISO B6, A6 and approx. 20
envelopes.
Maximum load height A4: 55 mm (500 sheets of 80 g/m2paper)
Letter / Legal: 52 mm (500 sheets of 75 g/m2paper)
Feedable paper type 60 - 105 g/m2
(11) Print delivery Face-down or (face-up)
(12) Print delivery tray capacity
Face-down Approx. 500 sheets (80 g/m2)
Face-up Discharge only

I-3
(13) Effective printing area
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 A (mm) B (mm) C (mm) D (mm) E (mm)
A4 210.0 297.0 203.2 288.5 3.39 ±1.0
Letter 215.9 279.4 207.4 270.9 4.23 ±1.0
Legal 215.9 355.6 207.4 347.1 4.23 ±1.0
B5 (ISO) 176.0 250.0 167.5 241.5 4.23 ±1.0
Executive 184.2 266.7 175.7 258.2 4.23 ±1.0
A5 148.0 210.0 139.5 201.5 4.23 ±1.0
B6(ISO) 125.0 176.0 116.5 167.5 4.23 ±1.0
A6 105.0 148.0 96.5 139.5 4.23 ±1.0
Table 1.2 Envelope
SIZE A (mm) B (mm) C (mm) D (mm) E (mm)
COM-10 104.8 241.3 96.3 232.8 4.23 ±1.0
MONARCH 98.4 190.5 89.9 182.0 4.23 ±1.0
DL 110.1 221.0 101.6 212.5 4.23 ±1.0
C5 162.2 228.6 154.1 220.1 4.23 ±1.0
B5 (ISO) 176.0 250.0 167.5 241.5 4.23 ±1.0
(The sizes above are nominal sizes according to ISO.)
An A4 sheet accepts 80 PICA-pitch characters (203.2mm).
C
E
E
D
Printable area
EA
B
E

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, 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
(15) Emulation 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
(16) CPU MB86832 100MHz (SPARC architecture)
(17) Resident fonts 75 scalable fonts and 12 bitmapped fonts
HP Laser Jet 5, EPSON FX-850, IBM Proprinter XL
Scalable Fonts:
Bitmapped Fonts (Portrait and Landscape):
•Letter Gothic 16.66 Medium, Italic, Bold, Bold Italic
•OCR-A
•OCR-B
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

I-5
BR-Script Level 2 Mode
Scalable Fonts:
(18) RAM 8M bytes (expandable to 72M bytes with SIMMs)
(19) PCMCIA card slots Two slots
Right slot for Type I and II
Left slot for Type I, II and III compatible for flash
memory or HDD cards
(20) Power souse USA and Canada : AC 110 to 120 V, 50/60 HZ
Europe and Australia : AC 220 to 240 V, 50/60 HZ
(21) Power consumption Printing (peak) : 1,130 WH or less
Printing (average) : 500 WH or less
Stand-by : 90 WH or less
Sleep : 25 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: 55 dB A or less
Stand-by : 40 dB A or less
(23) Dimensions (W x H x D) 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)
(24) Weight Approx. 15 kg (33 Ibs)
(25) 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)
•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
•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
PR99017

I-6
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
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. 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.

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.
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.
ADVARSEL-
USYNLIG LASER STRÅLING NÅR KABINETLÅGET STÅR ÅBENT. UNGDÅ DIREKTE UDSÆTTELSE FOR STRÅLING.
KLASSE 38 LASER.
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.
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.
VORSICHT-
UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET UND
SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
SICHERHEITSKLASSE 38.
Figure 1.3
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.

I-8
4. PARTS OF THE PRINTER
4.1 External Views
1
Upper cover
8
Face-up print delivery port
2
Control panel
9
Centronics interface connector
3
MP tray
10
RS-232C interface connector
4
Tray 1
11
USB port
5
Power switch
12
Duplex unit, Lower tray unit connector
6
PCMCIA card slots
13
Rating label
7
Fan outlet port
14
AC inlet
Figure 1.4
1
11
39
12
14
13
10
2
8
5
4
6
7

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

I-10
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:
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 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.

II-1
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. BASIC OPERATIONS
1.1 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 Optional I/O
(MIO)
External Device
Control panel
IMAGE FORMATION SYSTEM
Cleaning unit
Photosensitive drum
Developing
unit
Laser unit
LASER 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
(2 slots)
Figure 2.1

II-2
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)
Laser unit motor
Scanning mirror
Laser unit
Figure 2.2
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
180 C control 210 C
STBY
control 180 C control
Laser unit motor
Paper feed
motor
Pick-up roller
solenoid
Laser diode
Registration
sensor
0.18 sec 0.12 sec 1.50 sec 1.38 sec
2.54 sec
Figure 2.3