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CHAPTER 11 TROUBLESHOOTING
COPYRIGHT
©
1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
11-59
20 The copy has poor sharpness. (out-of-focus)
YES/NO
YES
YES
NO
NO
YES
NO
Cause
---------------
Original
Lens
Mirror
position
Scanner
Cartridge
Step
1
2
3
4
5
Checks
Is the image also too light?
Is the original off the copyboard glass?
Turn off and then on the power switch.
Does the lens move smoothly?
Is the horizontal ratio in Direct within
specification?
Clean the scanning lamp, reflecting
plate, mirror, and lens. Is the problem
corrected?
Action
Correct the light
image problem first.
1. Check the
copyboard cover too
see if it happens to
be warping.
2. Instruct the user on
the correct method
of placing originals.
Check the lens rail for
foreign matter, and
clean it.
Adjust the distance
between No. 1 mirror
and the No. 2 mirror.
End.
Replace the cartridge.
21 The copy is blank.
YES/NO
NO
YES
NO
NO
NO
YES
NO
Cause
Cartridge
Drum drive
assembly
High-voltage
transformer
Primary
high-voltage
charging
terminal,
cartridge
Step
1
2
3
4
5
6
Checks
Is the cartridge set in the machine?
Does the cartridge have toner?
Has the open seal been removed?
Set the cartridge in the machine, and
close the machine. Does the drum
cover shutter open properly?
Does the drum drive gear rotate
normally?
Is the primary charging terminal on
the front left of the cartridge in firm
contact with the high-voltage terminal
at the machine's bottom?
Action
Set the cartridge in the
machine.
Replace the cartridge.
Remove the opening
seal.
Check the cartridge.
Check the drum drive
assembly.
Check the high-
voltage transformer
(composite power
supply PCB).
1. Check the contacts
for electrical conti-
nuity.
2. Replace the car-
tridge