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.

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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

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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

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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

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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