Canon NP6251 Service Manual page 642

44. The hopper motor (M10) fails to operate.
Cause Step
Toner level
detection circuit
DC controller
PCB
J770, J719
COPYRIGHT © 1997 CANON INC.
Checks
1 Execute 'HPPR_MTR' in service
mode ( ). Does the hopper
4
motor rotate?
2 Does bit 10 of 'P002' in service
mode ( ) indicate '0' (toner
4
absent)?
3 When the hopper motor is turned
on by executing 'HPPR-MTR' in
service mode (
voltage between J105A-1 (+) and
J105A-2 (–) on the DC controller
PCB change from 24 to about 0
V?
4 Is the connection of relay connec-
tors J770 and J719 secure?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO
NO
YES
NO
), does the
4
NO
CHAPTER 11 TROUBLESHOOTING
Action
Go to step 3.
If there is toner in the
developing assembly,
replace the toner
detection PCB.
Replace the DC
controller PCB.
Connect the connectors
correctly.
11-111