1660esm.pdf

LASER PRINTER

SERVICE MANUAL

MECHANICS & ELECTRONICS

No part this publication may be reproduced in any form or by any means without permission in writing

from the publisher.

Trademarks:

• BR-Script, and DX-1600 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 :

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

information bulletins, is required for maintaining its quality performance and for fostering the practical ability

to find the cause of troubles.

CONTENTS

CHAPTER I

GENERAL

FEATURES .......................................................................................................................... I -1

SPECIFICATIONS ............................................................................................................... I -1

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

PARTS OF THE PRINTER ................................................................................................... I -8

4.1

External Views ........................................................................................................... I -8

4.2

Cross Sectional View ................................................................................................. I -9

STORAGE AND 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

BASIC OPERATIONS ........................................................................................................ II -1

1.1

Mechanical Configuration ......................................................................................... II -1

1.2

Main Drive ............................................................................................................... II -2

1.3

Basic Sequence of Operations ................................................................................ II -3

LASER/SCANNER SYSTEM ............................................................................................. II -4

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

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

CHAPTER III

ELECTRICAL SYSTEM

MAIN PCB ........................................................................................................................ III -1

1.1

Outline .................................................................................................................... III -1

1.2

Video Controller Circuit ........................................................................................... III -2

1.3

Engine Controller Circuit ......................................................................................... III -7

PAPER FEED DRIVE CIRCUIT ........................................................................................ III -9

DISPLAY CIRCUIT .......................................................................................................... III -11

3.1

Outline ................................................................................................................... III -11

3.2

Operation ............................................................................................................... III -11

LOW-VOLTAGE POWER SUPPLY ASSY ......................................................................... III -12

4.1

Outline ................................................................................................................... III -12

4.2

Protection Functions .............................................................................................. III -12

HIGH-VOLTAGE POWER SUPPLY ASSY ....................................................................... 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

PRINTER BODY

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 DetectionActuator ................................................................................. 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 RollerAssy, Bearing ........................................................................ IV -15

1.23

Paper Pick-up Solenoid .......................................................................................... IV -16

1.24

Paper Feed Motor Assy ......................................................................................... IV -16

1.25

MP Tray Cover ....................................................................................................... IV -17

1.26

MP Tray Assy ........................................................................................................ 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

Transfer Unit .......................................................................................................... IV -22

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