Canon PC400 Service Manual - Page 162

The copy has uneven density darker at front., The copy is foggy overall., Cartridge, Scanning

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CHAPTER 10 TROUBLESHOOTING 4. The copy has uneven density (darker at front). 5. The copy has uneven density (lighter at front). Cause Step Checks Scanner 1 Clean the scanning lamp, reflecting plate, and lens. Is the problem corrected? Cartridge, Scanning 2 Press the Copy Start key, and lamp switch the copier OFF in the middle of operation; then, open Transfer charging roller the top cover. Does the toner image on the photosensitive drum before transfer have uneven density? YES/NO Remedies YES End. YES NO 1. Replace the cartridge. 2. Replace the scanning lamp unit. Check the transfer charging roller. 6. The copy is foggy (overall). Cause Scanner Scanning lamp, Developing bias Grounding spring Step Checks 1 Clean the scanning lamp, reflecting plate, and lens. Is the problem corrected? 2 Is continuity present between photosensitive drum PCB and grounding spring? YES/NO Remedies YES End. YES NO 1. Check if the scanning lamp goes ON normally. 2. Check the developing bias. Check to make sure if the grounding spring is properly attached in front of the cartridge. 10-18 COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-18
CHAPTER 10 TROUBLESHOOTING
4.
The copy has uneven density (darker at front).
5.
The copy has uneven density (lighter at front).
6.
The copy is foggy (overall).
Cause
Step
Checks
YES/NO
Remedies
Scanner
1
Clean the scanning lamp,
reflecting plate, and lens.
Is the problem corrected?
YES
End.
Cartridge, Scanning
lamp
2
Press the Copy Start key, and
switch the copier OFF in the
middle of operation; then, open
the top cover.
Does the toner image on the
photosensitive drum before
transfer have uneven density?
YES
1. Replace the cartridge.
2. Replace the scanning
lamp unit.
Transfer charging roller
NO
Check the transfer charg-
ing roller.
Cause
Step
Checks
YES/NO
Remedies
Scanner
1
Clean the scanning lamp,
reflecting plate, and lens.
Is the problem corrected?
YES
End.
Scanning lamp,
Developing bias
2
Is continuity present between
photosensitive drum PCB and
grounding spring?
YES
1. Check if the scanning
lamp goes ON normally.
2. Check the developing
bias.
Grounding spring
NO
Check to make sure if the
grounding spring is prop-
erly attached in front of the
cartridge.