The Copy Is Blank - Canon GP605 Service Manual

CHAPTER 13 TROUBLESHOOTING
21

The copy is blank.

Cause Step
Developing
assembly
Developing
assembly drive
mechanism
Transfer
charging
assembly
CCD unit
Relay PCB
Laser unit image
processor PCB
Drum unit
13-80
COPYRIGHT © 1999 CANON INC.
1 Is the developing assembly locked to the
photosensitive drum during copying
operation?
2 Is the developing assembly rotating
during copying operation?
3 Is the transfer charging assembly fully
inserted?
4 Is leakage noted in the transfer charging
assembly?
5 Is the voltage of the power to the CCD
unit as rated?
6 Is the laser output normal?
Checks
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
NO Check the locking
mechanism of the
developing assembly.
NO Check the drive
mechanism of the
developing assembly.
NO Insert it fully.
YES Check the transfer
charging assembly.
NO 1. Check the relay
PCB.
2. Check the path of
power between the
CCD unit and the
relay PCB; if
normal, replace the
CCD unit.
NO 1. Replace the laser
unit.
2. Replace the image
processor PCB.
YES Replace the drum unit.