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20. The copy has poor sharpness.
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-61
CHAPTER 10 TROUBLESHOOTING
Cause
Original
Copyboard
glass
Lens drive
assembly
Transfer
charging roller
Drum cartridge
Developing
assembly
Development
bias
Mirror
Scanner
Checks
Is the original off the glass
surface?
Is copyboard glass stained with
oil? Is the copyboard glass
attached correctly?
Turn off and on the power switch.
Does the lens move smoothly?
Execute ‘No. 403’ in service mode
(transfer roller cleaning). Is the
problem corrected?
Is the transfer charging roller
securely inserted?
Is dirt, cracks, or scratches noted
on the transfer charging roller?
Are the position and condition of
the transfer roller pressure spring
normal?
Is the drum cartridge securely
set? (Check if the spacer for the
developing assembly is in contact
with the photosensitive drum
under pressure.)
Is the development bias generated
normally?
Is the horizontal reproduction ratio
in Direct with on specification?
Step
1
2
3
4
5
6
7
8
9
10
Results
YES
YES
NO
YES
NO
YES
NO
NO
NO
NO
YES
Action
1. Check the copyboard
cover for warping.
2. Advise the user how
to place an original.
• Clean the copyboard
glass.
• Re-attach the
copyboard glass.
Check the lens drive
assembly.
End.
Re-insert the charging
roller.
Replace the transfer
charging roller.
Correct or replace the
spring.
Replace the drum
cartridge or the
developing assembly.
• Replace the composite
power supply PCB.
(Replace the DC con
troller PCB.)
Adjust the position
between No. 1 and No. 2
mirrors.
Clean the scanning
lamp, reflecting plate,
mirrors, lens, and dust-
proofing glass.