Canon PC430 Service Manual - Page 164
The copy has white spots cross feed direction., The back of the copy is soiled.
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CHAPTER 10 TROUBLESHOOTING 12. The copy has white spots (cross feed direction). Cause Copy paper Copyboard rail Scanning lamp, Developing bias Step Checks YES/NO Remedies 1 Is the copy paper of a type recommended by Canon? NO Try recommended paper; if the results are good, advise the user to use recommended paper. 2 Try copy paper fresh out of package. Is the problem corrected? YES The copy paper may be moist; advise the user to store it wrapped. 3 Is the problem noted at the same YES Check the copyboard rail position on all copies? for foreign matter. NO Check the scanning lamp for flickering, and check the presence/absence of a developing bias. 13. The back of the copy is soiled. Cause Transfer charging assembly Feeding assembly Delivery roller Step Checks 1 Press the Copy Start key, and switch the copier OFF while the copy paper is moving through the feeding assembly. Is the back of the copy soiled? 2 Is the transfer charging assembly soiled? 3 Is the feeding assembly soiled? YES/NO Remedies NO Go to step 3. YES YES NO 1. Clean the transfer charging assembly. 2. Clean the registration roller. 3. Clean the pick-up guide plate. 4. Check the cartridge for leakage of toner. Clean the feeding assembly. Clean the delivery roller. 10-20 COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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