Canon CLC 1130, Service Manual

Page: 652 / 965

COPYRIGHT © 2002 CANON INC. CANON CLC1100/1130/1150/1160/1180 REV.1 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
13-81
CHAPTER 13 TROUBLESHOOTING
10 The copy has a white spot (middle of trailing edge).
A white spot in the middle of the trailing edge of a copy usually takes the following form:
Paper
White spot
• Principles behind the Fault
This type of fault mostly occurs when
paper is wavy. If its leading edge is not attracted evenly,
its trailing edge will lose contact with the drum in an increased degree.
This fault tends to occur when copying on the second side of a double-sided copy or in a high
humidity environment.
Cause
------------
------------
Service mode
ADJUST>MISC>
ATT-RTN
(attraction
additional rotation
mode)
ADJUST>HV-
ATT>HV-ATT in
service mode
(attraction high-
voltage output
adjustment mode)
Action
Go to step 7.
Replace the paper .
Set
ADJUST>MISC>
ATT-
RTN3
in service mode
to '1'.
Set
ADJUST>MISC>
ATT-
RTN4
in service mode
to '1'.
Set
ADJUST>MISC>
ATT-
RTN3 and ATT-RTN4
in service mode to '1'.
End.
Settings: -5 to +5
Unit:
2 µA
Step
1
2
3
4
5
6
Yes/No
YES
YES
YES
YES
YES
YES
Checks
Is the problem noted particularly
on thick paper?
Is the paper inside the cassette
wavy because of humidity?
Is the problem noted in single-
sided copying mode only or when
copying on the first side of a
double-sided copy?
Is the problem noted on the second
side of a double-sided copy only?
Does the problem occur in single-
sided copying or on the first and
second sides of a double-sided
copy?
Decrease the setting of
ADJUST>HV-ATT>
ATT-N1
or
ATT-N2
in service mode. Is the
problem corrected?
ATT-N1: for plain paper, single-
sided copying or for
copying on the 1st side
of a double-sided copy
ATT-N2: for copying on the 2nd
side of a double-sided
copy