Canon PC920 User manual

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
REVISION 0
FY8-13GA-000
AUG. 1999
PC860
F13-8491 TYA00001-
PC880
F13-8291 TZA00001-
PC890
F13-8242 UAA00001-
PC920
F13-8431 TVB00001-
F13-8441 PUD00001-
PUE00001-
F13-8461 PUH00001-
PC921
F13-8432 TVC00001-
PC940
F13-8436 TVD00001-
PC941
F13-8437 TVE00001-
PC950
F13-8231 TVF00001-
F13-8241 PUF00001-
PUG00001-
PC960
F13-8434 TVG00001-
PC980
F13-8232 TVH00001-
PC981
F13-8233 TVJ00001-

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
IMPORTANT
THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN, TO SERVE AS A SOURCE
OF REFERENCE FOR WORK IN THE FIELD.
SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY
FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER
PRINTED MATTER.
ANYQUESTIONSREGARDINGINFORMATIONCONTAINEDHEREINSHOULDBEDIRECTED
TOTHE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.
THIS DOCUMENTATION IS INTENDED FOR ALL SALES AREAS, AND MAY CONTAIN INFOR-
MATION NOT APPLICABLETO CERTAIN AREAS.
COPYRIGHT © 1999 CANON INC.
Printed in Japan
Imprimé au Japon
Use of this manual should be strictly su-
pervised to avoid disclosure of confidential
information.
Prepared by
OFFICE IMAGING PRODUCTSTECHNICAL SUPPORT DIVISION
CANON INC.
5-1, Hakusan 7-chome,Toride-shi, Ibaraki 302-8501 Japan

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
i
This service manual has been prepared for the PC800/900 Series machines,
providing basic information used for servicing the machines in the field so as to ensure
their quality and performance.
This service manual consists of the following chapters:
Chapter 1
General Description introduces the machine's features, specifications,
names of parts, and how originals are reproduced.
Chapter 2
Basic Operation explains how copies are made on a step-by-step basis.
Chapter 3
Exposure System discusses the principles of operation used for the
machine's exposure system. It also explains the timing at which exposure-
related mechanisms are operated, and shows how they may be
disassembled/assembled and adjusted.
Chapter 4
Image Formation System discusses the principles of operation used for the
machine's image formation system. It also explains the timing at which image
formation-related mechanisms are operated, and shows how they may be
disassembled/assembled and adjusted.
Chapter 5
Pick-Up/Feeding System discusses the principles of operation used for the
machine's pickup/feeding system. It also explains the timing at which pickup/
feeding-related mechanisms are operated, and shows how they may be
disassembled/assembled and adjusted.
Chapter 6
Fixing System discusses the principles of operation used for the machine's
fixing system. It also explains the timing at which fixing-related mechanisms
are operated, and shows how they may be disassembled/assembled and
adjusted.
Chapter 7
Externals/Auxiliary Mechanisms discusses the principles of operation used
for the machine's externals/auxiliary mechanisms. It also explains the timing
at which auxiliary mechanism-related mechanisms are operated, and shows
how they may be disassembled/assembled and adjusted.
Chapter 8
ADF explains the principles of operation of the ADF in view of electrical and
mechanical functions and in relation to their timing of operation. It also shows
how the unit may be disassembled/assembled and adjusted.
Chapter 9
Installation introduces requirements for the site of installation, and shows
how the machine may be installed using step-by-step instructions.
Chapter 10
Maintenance and Servicing provides tables of periodically replaced parts and
consumables/durables and scheduled servicing charts.
Chapter 11
Troubleshooting provides tables of maintenance/inspection, standards/
adjustments, and problem identification (image fault/malfunction).
Appendix contains a general timing chart and general circuit diagrams.
INTRODUCTION

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
ii
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specific functions and the
relationship between electrical and mechanical systems with reference to the timing
of operation.
Inthediagrams, represents the path of mechanical drive—where a signal name
accompanies the symbol , the arrow indicates the direction of the electric sig-
nal.
The expression “turn on the power” means flipping on the power switch, closing the
front door, and closing the delivery unit door, which results in supplying the machine
with power.
2. In the digital circuits, ‘1’ is used to indicate that the voltage level of a given signal is
“High,” while ‘0’ is used to indicate “Low.” (The voltage value, however, differs from
circuit to circuit.)
Inpracticallyall cases,theinternalmechanisms ofamicroprocessorcannotbe checked
in the field. Therefore, the operations of the microprocessors used in the machines
are not discussed: they are explained in terms of from sensors to the input of the DC
controller PCB and from the output of the DC controller PCB to the loads.
The descriptions in this Service Manual are subject to change without notice for
product improvement or other reasons, and major changes will be communicated in the
form of Service Information bulletins.
All service persons are expected to have a good understanding of the contents of this
Service Manual and all relevant Service Information bulletins and be able to identify and
isolate faults in the machine.

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
iii
Model
PC860
PC880
PC890
PC920
PC920
PC920
PC920
PC921
PC940
PC941
PC950
PC950
PC950
PC960
PC980
PC981
Type
code
TYA
TZA
UAA
PUD
PUE
PUH
TVB
TVC
TVD
TVE
PUF
PUG
TVF
TVG
TVH
TVJ
Multi-
feeder
√
√
√
√
√
√
√
√
Single
feeder
√
√
√
√
√
√
√
√
Zoom
√
√
√
√
√
√
√
√
√
√
√
√
√
Default
ratio
2R2E
2R2E
2R2E
2R2E
2R2E
2R2E
3R1E
3R1E
3R1E
3R1E
2R2E
2R2E
3R1E
3R1E
3R1E
3R1E
ADF
as
standard
√
√
√
√
Cassette
250 sheets
250 sheets
250 sheets
Universal
Universal
Universal
Universal
Universal
Universal
Universal
Universal
Universal
500 sheets
Universal
500 sheets
500 sheets
Copying
speed
(cpm) at
Direct
12
12
12
10
10
10
10
10
13
13
12
12
13
10
13
13
The notation “√” indicates that the item in question is available.
• This service manual covers the models shown in the following table. Be sure to have a
good understanding of the difference from model to model before referring to this
manual.
Density
correction
switch
(SW101)
√
√
√
√
√
√
√
√

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
iv

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
v
CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
CHAPTER 2 BASIC OPERATION
CHAPTER 3 EXPOSURE SYSTEM
I. FEATURES ..................................1-1
II. SPECIFICATIONS .......................1-2
A. Copier....................................1-2
B. ADF .......................................1-8
III. NAMES OF PARTS................... 1-10
A. External View ..................... 1-10
B. Cross Section..................... 1-13
IV. USING THE MACHINE ............. 1-15
A. Control Panel...................... 1-15
V. ROUTINE MAINTENANCE
BY THE USER .......................... 1-17
VI. IMAGE FORMATION ................ 1-20
A. Outline................................ 1-20
I. BASIC OPERATIONS ..................2-1
A. Functional Construction ........2-1
B. Outline of Electrical
Circuitry .................................2-2
C. Basic Sequence of
Operations.............................2-3
D. Controlling the Main Motor
(M1) .......................................2-5
E. Inputs to and Outputs from
the DC Controller ..................2-7
I. OPERATIONS..............................3-1
A. Outline...................................3-1
B. Varying the Reproduction
Ratio......................................3-2
C. Lens Drive System................3-3
D. Scanner Drive System ..........3-4
II. EXPOSURE SYSTEM .................3-9
A. Controlling the Scanning
Lamp .....................................3-9
III. DISASSEMBLY/ASSEMBLY ..... 3-12
A. Scanner Drive Assembly.... 3-13
B. Lens Drive Assembly ......... 3-31
C. Exposure System............... 3-37

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
vi
CHAPTER 4 IMAGE FORMATION SYSTEM
CHAPTER 5 PICK-UP/FEEDING SYSTEM
I. IMAGE FORMATION SYSTEM ...4-1
A. Outline...................................4-1
B. Timing Chart for the Image
Formation System .................4-3
C. Controlling the Primary
Charging Roller Bias .............4-4
D. Controlling the Transfer
Roller Bias.............................4-8
E. Controlling the Developing/
Separation Static Eliminator
Bias .................................... 4-11
F. Measuring the Density of
Originals ............................. 4-16
G. Controlling the Side Blanking
Mechanism......................... 4-21
II. DISASSEMBLY/ASSEMBLY ..... 4-22
A. Cartridge ............................ 4-23
B. Transfer Charging
Assembly............................ 4-25
C. Blank Exposure.................. 4-26
I. PICKUP/FEEDING SYSTEM.......5-1
A. Outline...................................5-1
B. Controlling the Pickup
Roller .....................................5-3
C. Controlling the Movement of
Paper.....................................5-9
D. Detecting Jams .................. 5-12
II. DISASSEMBLY/ASSEMBLY ..... 5-18
A. Pickup Assembly ................ 5-19
B. Multifeeder Assembly......... 5-28
C. Single-feeder Assembly ..... 5-31
D. Feeding Assembly.............. 5-33
E. Registration Roller
Assembly............................ 5-34
F. Delivery Assembly.............. 5-36
CHAPTER 6 FIXING SYSTEM
I. OPERATIONS ..............................6-1
A. Outline...................................6-1
B. Controlling the Fixing
Temperature ..........................6-3
II. DISASSEMBLY/ASSEMBLY ..... 6-10
A. Fixing Assembly ................. 6-11

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
vii
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
CHAPTER 9 INSTALLATION
CHAPTER 10 MAINTENANCE AND SERVICING
CHAPTER 8 ADF
I. FANS ............................................7-1
II. POWER SUPPLY SYSTEM.........7-3
A. Outline of the Power Supply
System ..................................7-3
B. Power Supply Circuit.............7-4
C. Detecting an Error on
the Composite Power Supply
PCB .......................................7-6
D. Protecting the Power Supply
Circuit ....................................7-6
III. DISASSEMBLY/ASSEMBLY ........7-7
A. External Covers.....................7-8
B. Control Panel...................... 7-15
C. Copyboard Glass ............... 7-16
D. Main Motor/Main Drive
Assembly............................ 7-17
E. Electrical System ............... 7-21
I. ADF ..............................................8-1
A. Outline...................................8-1
B Basic Construction ................8-2
C. Basic Operations...................8-4
D. Detecting an Original ............8-6
E. Pickup Operation...................8-8
F. Delivery .............................. 8-12
G. Controlling the Pickup
Motor .................................. 8-14
H. Controlling the Belt Motor .. 8-15
I. Detecting Original Jams..... 8-16
J. Power Supply ..................... 8-17
II. DISASSEMBLY/ASSEMBLY ..... 8-18
A. Removing the ADF............. 8-19
B. External Covers.................. 8-21
C. Drive System...................... 8-23
D. Feeding System ................. 8-26
E. Electrical System ............... 8-33
I. SELECTING A SITE ....................9-1
II. UNPACKING AND
INSTALLATION ............................9-2
A. Unpacking and Installation....9-2
B. Placing Copy Paper...............9-9
III. MOVING THE MACHINE .......... 9-12
I. PERIODICALLY REPLACED
PARTS....................................... 10-1
II. DURABLES AND
CONSUMABLES ...................... 10-1
III. SCHEDULED SERVICING ....... 10-1
IV. STORING AND HANDLING
THE CARTRIDGE..................... 10-2
A. Storing the Cartridge with the
Packaging Seal Intact ........ 10-2
B. Storing and Handling the
Cartridge with the Packaging
Seal Removed.................... 10-3

COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
viii
APPENDIX
CHAPTER 11 TROUBLESHOOTING
I. MAINTENANCE AND
INSPECTION ............................ 11-3
A. Image Adjustment Basic
Procedure........................... 11-3
B. Points to Note for
Servicing ............................ 11-4
II. STANDARDS AND
ADJUSTMENTS ....................... 11-5
A. Mechanical ......................... 11-5
B. ADF .................................. 11-30
C. Electrical........................... 11-41
III. TROUBLESHOOTING IMAGE
FAULTS ................................... 11-48
A. Making Initial Checks ....... 11-48
B. Sample Image Faults ....... 11-52
C. Troubleshooting Image
Faults................................ 11-53
IV. TROUBLESHOOTING
MALFUNCTIONS.................... 11-61
A. Troubleshooting
Malfunctions ..................... 11-61
V. TROUBLESHOOTING FEEDING
PROBLEMS ............................ 11-75
A. Copy Paper Jam............... 11-75
B. Faulty Feeding.................. 11-78
VI. ARRANGEMENT AND
FUNCTIONS OF ELECTRICAL
PARTS..................................... 11-79
A. Sensors and Solenoids.... 11-79
B. Switches........................... 11-80
C. Lamp, Heater, Motor, Etc. 11-81
D. PCBs ................................ 11-82
E. ADF .................................. 11-83
F. Variable Resistors (VR) and
Check Pins by PCB.......... 11-84
VII. SELF DIAGNOSIS .................. 11-86
A. GENERAL TIMING CHART........ A-1
B. SIGNALS AND
ABBREVIATIONS ....................... A-3
C. GENERAL CIRCUIT
DIAGRAM ................................... A-5
D. DC CONTROLLER CIRCUIT
DIAGRAM ................................... A-7
E. ADF CONTROLLER CIRCUIT
DIAGRAM ................................. A-15
F. COMPOSITE POWER SUPPLY
CIRCUIT DIAGRAM.................. A-19
G. CONTROL PANEL CIRCUIT
DIAGRAM ................................. A-27
H. AE SENSOR CIRCUIT
DIAGRAM ................................. A-29
I. SENSOR CIRCUIT
DIAGRAM ................................. A-30
J. NOISE FILTER CIRCUIT
DIAGRAM ................................. A-31
K. HIGH VOLTAGE CONTACT
CIRCUIT DIAGRAM.................. A-32
L. BLANK EXPOSURE (front)
CIRCUIT DIAGRAM.................. A-33
M. BLANK EXPOSURE (rear)
CIRCUIT DIAGRAM.................. A-34
N. SPECIAL TOOLS ...................... A-35
O. SOLVENTS/OILS ...................... A-36