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