Canon PC920 Service Manual page 10

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