The Output Is Blank - Canon iR1200 Series Service Manual

3.1.19 The output is blank.

General conditions
1) Execute 'PRINT test'. Is the output image normal? (See 3.21.5 of
YES: Go through steps 12) to 15).
NO:
General condition
2) Turn off the power while an image is being printed on the photo-
YES: Go through steps 9) to 11).
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 connec-
NO:
Connectors
5) Is the connection of the following connectors on the DC controller
NO:
Drum unit
6) Try replacing the drum unit. Is the fault corrected?
YES: End.
Developing unit
7) Try replacing the developing unit. Is the fault corrected?
YES: End.
Laser scanner unit, DC controller PCB
8) Try replacing the laser scanner unit. Is the problem corrected?
YES: End.
NO:
Transfer guide
9) Measure the transfer guide and other metal areas. Is the resistance
YES: Check the area around the transfer guide for pieces of metal (e.g.,
COPYRIGHT © 2002 CANON INC.
Chapter 2.)
Go to step 2).
sensitive drum. Is the toner image developed on the drum surface?
Go through steps 3) to 8).
tridge soiled? (Remove the cartridge to check.)
tors (J205, J207) on the DC controller normal?
Correct it. If the problem cannot be corrected, replace the faulty
part.
PCB normal: J201 and J204 on the DC controller PCB; J303, J304,
J312, and J316 on the image processor PCB; J3122, and J801 of the
laser scanner unit?
Connect them firmly. If the flexible cable has a scratch, replace it.
Replace the DC controller PCB.
Ω. Ω. Ω. Ω.
0 Ω.
screw).
2000 2000 2000 2000
CHAPTER 7 TROUBLESHOOTING
CANON iR1200/iR1300 Series REV. 0 AUG. 2002
7-35