CHAPTER 10 TROUBLESHOOTING
4. The copy has uneven density (darker at front).
5. The copy has uneven density (lighter at front).
CauseStepChecksYES/NORemedies
Scanner1Clean the scanning lamp, YESEnd.
reflecting plate, and lens.
Is the problem corrected?
Cartridge, Scanning 2Press the Copy Start key, and YES1. Replace the cartridge.
lampswitch the copier OFF in the 2. Replace the scanning
middle of operation; then, open lamp unit.
the top cover.Transfer charging rollerNOCheck the transfer charg-
Does the toner image on the ing roller.
photosensitive drum before
transfer have uneven density?
6. The copy is foggy (overall).
CauseStepChecksYES/NORemedies
Scanner1Clean the scanning lamp, YESEnd.
reflecting plate, and lens.
Is the problem corrected?
Scanning lamp, 2Is continuity present between YES1. Check if the scanning
Developing biasphotosensitive drum PCB and lamp goes ON normally.
grounding spring?2. Check the developing
bias.
Grounding springNOCheck to make sure if the
grounding spring is prop-
erly attached in front of the
cartridge.
10-18COPYRIGHT ? 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON) |