Canon 1000 Service Manual page 502

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Cause Step
Service mode
Developing
assembly
Grid wire (pri-
mary charging
assembly)
Pre-exposure
lamp
Transfer/static
eliminating
system
Fixing unit
7-66
COPYRIGHT © 2001 CANON INC.
Checks
7 Are the settings of 'CCD' in service
mode as indicated on the service
label?
8 Execute 'AUTO-ADJ' of 'CCD' under
'FUNC'. Is the problem corrected?
9 Is uneven density noted in all colors?
10 Is the grid plate of the primary
charging wire normal?
11 Does the pre-exposure lamp turn ON
during copying operation?
12 • Is the transfer blade locking
mechanism of the transfer unit
normal?
• Are there scratches or a fault on
the transfer blade?
• Operate the transfer blade using
'BLADE' under 'FUNC' in service
mode to check the locking of the
transfer blade. At this time, is the
transfer blade subject to warping
or other fault?
13 Are there scratches or dents in the
peripheral direction of the fixing roller
(upper, lower)?
14 Is there a fault in the fixing oil apply-
ing roller, oil hose, oil tank, fixing oil
pump drive solenoid (SL2), or oil
removing blade?
Yes/No
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
NO Enter the correct settings.
NO Try replacing the image
processor and the analog
processor.
NO Check the developing
assembly and the devel-
oping cylinder for which
uneven density is noted; if
a fault is found, clean or
replace it.
NO Replace the grid plate.
NO Check the contact of
J2239 on the DC controller
PCB and the wiring from
J2239 to J6021 on the pre-
exposure lamp PCB; if
normal, replace the pre-
exposure lamp PCB.
YES Check the transfer blade
locking mechanism; if
normal, replace the
transfer blade.
YES Replace the fixing roller.
YES Remove the cause of the
fault, and replace the part.