Canon 1000S, Service Manual

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COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
11 The copy has white spots (trailing center).
Action
Go to step 3.
Replace the paper.
See “The cassette heater
fails to operate.”
Check the transfer belt;
replace it if dents exist in
the surface.
A trailing center white spot is a type of transfer failure and is found at the center of the trailing edge of a
paper.
Paper
Trailing center spot
Figure 7-312
n
Trailing Center White Spot
A trailing center white spot is caused by warping of paper. The leading edge of such paper is retained on
the transfer belt without uniform contact, causing its trailing edge to warp.
This problem tends to occur particularly when copying on the second side of a two-sided copy in a high
humidity environment.
Cause
Cassette heater
Transfer belt
Step
1
2
3
Checks
Does the problem occur only when
copying on special paper or thick
paper?
Is the paper wavy because of humid-
ity?
Is the cassette heater operating
normally?
Yes/No
YES
NO
NO
YES