Canon LBP-1760 Manuel utilisateur

SERVICE

MANUAL

REVISION 0

RY8-1387-000

MAY 1998

LBP-1760

Printed in Japan

Imprimé au Japon

Use of this manual should be

strictly supervised to avoid

disclosure of confidential

information.

Prepared by

PERIPHERAL PRODUCTS QUALITY ADVANCEMENT DIV.

PERIPHERAL PRODUCTS TECHNICAL DOCUMENTATION DEPT.

CANON INC.

5-1, Hakusan 7-chome, Toride-City, Ibaraki-Pref. 302-8501, Japan

PREFACE

This Service Manual contains basic information required for after-sales service of the laser beam

printer LBP-1760 (here after referred to as the “printer”). This information is vital to the service

technician in maintaining the high print quality and performance of the printer.

The paper feeder, envelope feeder and duplexing unit, which are prepared for the printer as

options, are described in this manual.

This manual consists of the following chapters:

Chapter 1: Product information

Features, specifications and installation

Chapter 2: Operation and Timing

A description of the operating principles and timing sequences of the electrical and

mechanical systems

Chapter 3: The Mechanical System

Explanation of mechanical operation, disassembly, reassembly and adjustment pro-

cedures

Chapter 4: Troubleshooting

Troubleshooting procedures, reference values and adjustments, maintenance and

servicing, etc.

Appendix: General timing chart, general circuit diagram, etc.

Information in this manual is subject to change as the product is improved or redesigned. All

relevant information in such cases will be supplied in the Service Information Bulletins.

A thorough understanding of this printer, based on information in this Manual and Service

Information bulletins, is required for maintaining its performance and for locating and repairing

the causes of malfunctions.

DTP system

This manual was produced on an Apple PowerMacintosh 9500/200 personal computer and output by an

Apple LaserWriter 16/600 PS laser beam printer.

All graphics were produced with Macromedia FreeHand (J), and all documents and page layouts were

created with QuarkXPress (E).

The video images were captured with SONY degital video camcorder and MASS microsystems

Quickimage 24 video capture board, and modified with Adobe Photoshop(J).

CONTENTS

CHAPTER 1 PRODUCT INFORMATION

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

II. SPECIFICATIONS.................... 1-3

III. SAFETY INFORMATION..... 1-6

IV. PARTS OF THE PRINTER ....... 1-7

V. INSTALLATION ....................... 1-12

VI. MAINTENANCE AND

SERVICING BY THE

CUSTOMER ............................ 1-19

VII. OPERATION............................ 1-20

CHAPTER 2 OPERATION AND TIMING

CHAPTER 3 THE MECHANICAL SYSTEM

I. BASIC OPERATION................. 2-1

A. Functions.......................... 2-1

B. Basic Operation Sequences 2-2

C. Power ON Sequence........... 2-3

II. ENGINE CONTROL SYSTEM.... 2-4

A. Engine Controller PCB....... 2-4

B. Fixing Control ................... 2-10

C. High-Voltage Power Supply

Circuit............................... 2-14

D. Low-Voltage Power Supply

Circuit............................... 2-16

E. Video Interface Control ..... 2-17

F. Other Controls .................. 2-20

III. LASER/SCANNER SYSTEM..... 2-22

A. Outline.............................. 2-22

B. Laser Control Circuit......... 2-23

C. Scanner System ................ 2-26

IV. IMAGE FORMATION SYSTEM . 2-28

A. Outline.............................. 2-28

B. Printing Process ................ 2-30

V. PICK-UP/FEED SYSTEM......... 2-38

A. Outline.............................. 2-38

B. Paper Size Detection ......... 2-40

C. Cassette Pick-up................ 2-41

D. Multi-purpose Tray

Pick-up.............................. 2-44

E. Fixing and Delivery Unit.... 2-46

F. Paper Jam Detection ......... 2-48

VI. VIDEO CONTROL SYSTEM...... 2-50

A. Video Controller Circuit .... 2-50

B. Adapter Circuit.................. 2-52

C. Operation Panel................. 2-55

D. Self Test............................ 2-56

VII. PAPER FEEDER...................... 2-58

A. Outline.............................. 2-58

B. Pick-up and Feeding.......... 2-59

C. Paper Jam Detection......... 2-62

VIII.ENVELOPE FEEDER ............... 2-63

A. Outline.............................. 2-63

B. Pick-up and Feeding.......... 2-64

C. Paper Jam Detection......... 2-67

IX. DUPLEXING UNIT ................... 2-68

A. Outline.............................. 2-68

B. Reversing and duplexing

unit Pick-up ...................... 2-70

C. Paper Jam Detection......... 2-74

I. EXTERNALS ........................... 3-1

A. External Covers................. 3-1

B. Pick-up Module.................. 3-5

C. Cooling Fan....................... 3-6

D. Operation Panel................. 3-7

II. DRIVE SYSTEM ...................... 3-8

A. Drive Unit ......................... 3-8

B. Main Motor........................ 3-9

C. Pick-up Drive Unit............. 3-10

III. PAPER TRANSPORT SYSTEM . 3-11

A. Cassette Pick-up Roller ..... 3-11

B. Cassette Feed Roller.......... 3-11

C. Separation Roller .............. 3-12

D. Multi-purpose Tray

Pick-up Roller ................... 3-12

E. Separation Pad .................. 3-13

F. Multi-purpose Tray Unit .... 3-14

G. Registration Unit............... 3-15

H. Feed Roller Unit ................ 3-17

I. Feed Guide Unit ................ 3-18

J. Delivery Unit..................... 3-18

IV. EXPOSURE SYSTEM............... 3-19

A. Laser/Scanner Unit ........... 3-19

V. ELECTROSTATIC IMAGING/

DEVELOPING/CLEANING

SYSTEM ................................. 3-20

A. EP-52 Cartridge................. 3-20

B. Transfer Charging Roller ... 3-21

VI. FIXING SYSTEM ..................... 3-23

A. Fixing Unit ........................ 3-23

VII. PRINTED CIRCUIT BOARDS ... 3-27

A. Engine Controller PCB....... 3-27

B. Paper Size Detection PCB.. 3-28

C. Video Controller PCB......... 3-29

D. Adapter PCB ...................... 3-30

VIII.PAPER FEEDER...................... 3-31

IX. ENVELOPE FEEDER ............... 3-35

X. DUPLEXING UNIT ................... 3-39

CHAPTER 4 TROUBLESHOOTING

I. PREFACE ............................... 4-1

A. Malfunction Diagnosis

Flowchart .......................... 4-1

B. Initial Check ..................... 4-4

C. Test Print.......................... 4-5

II. IMAGE DEFECTS.................... 4-10

III. PAPER JAMS

TROUBLESHOOTING .............. 4-16

IV PAPER TRANSPORT

TROUBLESHOOTING .............. 4-22

V. MALFUNCTION

TROUBLESHOOTING .............. 4-24

VI. MALFUNCTION STATUS

TROUBLESHOOTING .............. 4-25

VII. MEASUREMENT AND

ADJUSTMENT ........................ 4-34

A. Mechanical Adjustment ..... 4-34

B. Electrical Adjustment........ 4-38

C. Variable Resisters, LEDs,

Test Pins, Jumpers and

Switches on PCBs.............. 4-40

VIII.MAINTENANCE AND

SERVICING............................. 4-43

A. Periodic Replacement

Parts ................................ 4-43

B. Expected Service Life of

Consumable Parts.............. 4-43

C. Periodic Service ................ 4-43

D. Cleaning Points for

Servicing .......................... 4-44

E. Standard Tools .................. 4-46

F. Special Tools ..................... 4-47

G. Printer driver tester .......... 4-48

H. Solvents and Oil List ......... 4-55

IX. LOCATION OF ELECTRICAL

PARTS.................................... 4-56

A. Switches............................ 4-56

B. Sensors ............................. 4-58

C. Clutches/Solenoids ........... 4-60

D. Motors/Others................... 4-62

E. PCBs.................................. 4-64

F. Connectors........................ 4-66

APPENDIX

I. GENERAL TIMING CHART ...... A-1

II. GENERAL CIRCUIT DIAGRAM A-3

III. LIST OF SIGNALS................... A-5

IV. MESSAGE TABLE ................... A-11

CHAPTER 1

PRODUCT INFORMATION

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

II. SPECIFICATIONS.................... 1-3

III. SAFETY INFORMATION..... 1-6

IV. PARTS OF THE PRINTER ....... 1-7

V. INSTALLATION ....................... 1-12

VI. MAINTENANCE AND

SERVICING BY THE

CUSTOMER ............................ 1-19

VII. OPERATION............................ 1-20

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