Canon GP405 Service Manual page 457

Cause
Development Developing
assembly
Toner
level
detecting
Drum unit
Image processor
PC, Analog
processor PCB
Primary charging high-voltage cord resistance: 10 KΩ (approx.)
Separation high-voltage cord (white): 10 KΩ (approx.)
Transfer guide cord resistance: 10 KΩ (approx.)
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Step Check
9 Is the developing assembly set
correctly? (Are the rolls of the
developing assembly in firm
contact with the photosensitive
drum?)
10 Is there toner in the developing
assembly?
11 Replace the drum unit. Is the
problem corrected?
12
CHAPTER 14 TROUBLESHOOTING
Yes/No
NO Set the developing
assembly correctly.
NO • Check the toner sensor.
• Check the connector
and the harness for
continuity.
YES End.
NO Replace the image
processor PCB and the
analog processor PCB.
Action
14-39