The Output Is Too Dark - Canon SmartBase PC1200s Service Manual

CHAPTER 7 TROUBLESHOOTING
Contact sensor
17) Try replacing the contact sensor. Is the problem corrected?
YES: End.
Analog processor PCB, Image processor PCB
18) Try replacing the analog processor PCB. Is the problem corrected?
YES: End.
NO:

3.1.2 The output is too dark.

Image density
1) Is the image density setting correct?
•
•
NO:
General condition
2) Execute 'PRINT test'. Is the output image normal? (See 3.21.5 of
YES: Go through steps 8) to 12).
NO:
High-voltage contact (between cartridge and high-voltage spring)
3) Is the high-voltage spring used to supply high voltage to the car-
YES: Clean it.
High-voltage contact (between high-voltage spring and DC controller PCB; J205, J207)
4) Is the connection between the high-voltage spring and the DC con-
YES: Correct it. If it cannot be corrected, replace the faulty part.
Connector
5) Is the connection of the following connectors normal: J201 and
NO:
Cartridge
6) Try replacing the cartridge. Is the problem corrected?
YES: End.
Laser scanner unit, DC controller PCB
7) Try replacing the laser scanner unit. Is the problem corrected?
YES: End.
NO:
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COPYRIGHT © 2001 CANON INC.
Replace the image processor PCB.
In the case of copier functions: PRINT EXPOSURE of COMMON
SETTINGS and STANDARD EXPOSURE of COPY SETTINGS
on user mode menu.
In the case of printer functions or fax functions, PRINT EXPO-
SURE of COMMON SETTINGS on user mode menu.
Correct the image density setting.
Chapter 2.)
Go through steps 3) to 7).
tridge soiled? (Remove the cartridge to check.)
troller PCB (J205, J207) normal?
J204 on the DC controller PCB; J303, J304, J312, and J316 on the
image processor PCB; J3122 and J801 in the laser scanner unit?
Connect them firmly. If the flexible cable has a scratch, replace it.
Replace the DC controller PCB.
2000 2000 2000 2000 CANON SmartBase PC1200s/iR1200s REV. 0 DEC. 2001