SERVICE
MANUAL
REVISION 0
COPYRIGHT
©© 1998 CANON INC.
CANON LBP-1760 REV. 0 MAY 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
RY8-1387-000
MAY 1998
LBP-1760
COPYRIGHT © 1998 CANON INC
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
TM (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