The Copy Is Solid Black - Canon CLC 1120 Service Manual

CHAPTER 13 TROUBLESHOOTING
15

The copy is solid black.

Cause
-------------
Potential control
Cleaning blade
Output system
(primary
charging, grid
bias)
Original exposure
Anti-counterfeit
mechanism
Original exposure
system
Connectors,
wiring
DC power supply
CCD unit
analog processor
PCB
IP-MAIN PCB
13-88
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Generate a horizontal stripe test
print (TYPE=10). Is the image
normal?
2 Execute FUNCTION>DPC>DPC
in service mode. Is the copy image
normal?
3 Is the photosensitive drum cleaned?
4 Is there electrical continuity
between both connectors of the
high-voltage cord connected to the
primary charging assembly?
5 Does the scanning lamp turn on?
6 Does the problem occur when a
bank note is copied? Or, does it
occur when an original identical to
a bank note is copied?
7 Is the copyboard glass riding over
an object?
8 Clean the original scanning lamp,
reflecting plate, No. 1, 2, and 3
mirrors, standard white plate, and
copyboard glass, and execute
FUNCTION>CCD>CCD-ADJ in
service mode. Is the problem
corrected?
9 Are the connectors between the
following PCBs and the wiring
between connectors normal?
· IP-MAIN PCB
· analog processor PCB
· CCD driver PCB
10 Is there DC power present between
the following terminals on the
analog processor PCB?
J2100-7 (+) -6 (-): +5 V
J2100-4 (+) -3 (-): +8.8 V
J2100-2 (+) -1 (-): +15 V
Yes/No
YES
YES
NO
NO
YES
NO
YES
YES
YES
NO
NO
YES
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Go to step 5.
End.
· Check the locking
lever of the cleaning
blade.
· Check the temperature
control mechanism of
the photosensitive
drum and SSR.
Replace the high-voltage
cord.
· Check the output
system of the primary
charging assembly and
the grid bias
· Try replacing the
HVT-DC PCB.
See 42. "The scanning
lamp fails to turn on."
The anti-counterfeit
mechanism turned on.
Advise the user that
copying bank notes is
illegal.
Remove the object.
End.
Make connections
properly.
See 40. "DC power is
absent."
Try replacing the
following in turns:
· CCD unit
· analog processor PCB
· IP-MAIN PCB