The Copy Has A Blurred Image; The Copy Has Horizontal Fogging - Canon PC920 Service Manual

CHAPTER 11 TROUBLESHOOTING

18 The copy has a blurred image.

Cause Step
Scanner 1
drive cable
Scanner rail 2
--------------- 3
Feeding 4
system
Cartridge

19 The copy has horizontal fogging.

Cause Step
Scanning 1
lamp
Cartridge, 2
High-voltage
transformer
assembly
Scanning 3
system
Feeding
system
11-58
Checks
Does the cable wind on itself when the
scanner is moving? Or, is the cable too
slack or too taut?
Move the No. 1 mirror mount slowly
by hand. Does it move slowly?
Is abnormal noise heard from the
scanner motor?
Does the copy paper spring up or stop
around the transfer assembly?
Checks
Does the scanning lamp flicker?
Replace the cartridge. Is the problem
corrected?
Make a reduced copy, and compare it
against one made in Direct. Is the
problem found at different positions?
COPYRIGHT © 1999 CANON INC.
YES/NO
YES
NO
YES
YES
NO
YES/NO
YES
YES
NO
YES
NO
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
1. Route the cable
correctly.
2. If the cable is
twisted or frayed,
replace it.
Clean the surface of
the scanner rail with
alcohol. Then, apply
lubricant. (CK-0551)
See "The scanner fails
to move forward/in
reverse."
Check the feeding
assembly for burrs.
Replace the cartridge.
Action
Replace the scanning
lamp.
End.
Check the high-
voltage transformer
(composite power
supply PCB).
Check the scanning
system.
Check the feeding
system.