Canon PC1000s Service Manual page 318

CHAPTER 7 TROUBLESHOOTING
3.1.20 The
output is solid black.
General conditions
1) Execute
'PRINT
test'. Is the output image normal? (See 3.20.5 of
Chapter 7.)
YES: Go through steps 5) to 8).
NO: Go through steps 2) to 4).
High voltage contact (between primary charging roller and high-voltage spring)
2) Is the high-voltage spring used to supply power to the cartridge
soiled? (Remove the cartridge to check.)
YES: Clean it.
High-voltage contact (high-voltage spring and DC controller PCB;
5205)
3) Is the connection between the high-voltage spring and the DC con-
troller PCB (5205) normal?
NO: Correct it. If the problem cannot be corrected, replace the faulty part.
Cartridge, DC controller PCB
4) Try replacing the cartridge. Is the problem corrected?
YES: End.
NO: Redace the DC controller PCB.
Contact sensor LED intensity auto adjustment adjustment
5) Execute contact sensor LED intensity auto adjustment adjustment.
Is the problem corrected? (See 1.2.4.1 of this chapter.)
YES: End.
Connector
6) Is the connection of the following controller normal: 5501 and 5503
on the analog processor PCB, 5317 on the image processor PCB;
5504 of the contact sensor?
NO:
Connect them firmly. If the flexible cable has a scratch, replace it.
Contact sensor
7) Try replacing the contact sensor. Is the problem corrected?
YES: End.
Analog processor PCB, Image processor PCB
8) Try replacing the analog processor PCB. Is the problem corrected?
YES: End.
NO: Replace the image processor PCB.
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CANON INC.
CANON PC1000slirnageCLAS 136006
REV.
1 AUG.2002