The Copy Has White Spots - Canon 1000 Service Manual

11 The copy has white spots (trailing center).
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 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 Step
Cassette heater
Transfer belt
COPYRIGHT © 2001 CANON INC.
Checks
1 Does the problem occur only when
copying on special paper or thick
paper?
2 Is the paper wavy because of humid-
ity?
3 Is the cassette heater operating
normally?
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Figure 7-312
Yes/No
Trailing center spot
Action
YES Go to step 3.
NO Replace the paper.
NO See "The cassette heater
fails to operate."
YES Check the transfer belt;
replace it if dents exist in
the surface.
7-79