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CHAPTER 10 TROUBLESHOOTING
10–46
COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
6. E013
Waste toner feeding
screw
Waste toner feeding
screw locked sensor
(PS8)
DC controller PCB
1
2
NO
NO
YES
Is the flag of the waste toner feeding screw
locked sensor rotating when the main motor
is rotating?
Is the waste toner feeding screw locked
sensor normal? (See the instructions on how
to check the photointerrupters.)
Remove the drum unit, and
turn the feeding screw by
hand. If it rotates easily, check
how it is mounted. If it does
not turn, replace the drum unit,
and remove the cause.
Check the wiring from the DC
controller PCB to PS8; if
normal, replace PS8.
Replace the DC controller
PCB.
Actions
ChecksStep
Cause
Yes/No
7. E030
Total copy counter
(CNT1)
Total copy counter
(CNT1)
DC controller PCB
1
2
NO
YES
NO
Turn off the power switch, and disconnect
J102 from the DC controller PCB. Set the
meter range to 1 KΩ, and connect the probes
to J102-A11 and J102-A10. Is the resistance
about 500 Ω?
Connect J102 to the DC controller PCB, and
turn on the power switch. Set the meter range
to 30 VCD, and connect the probes J102-
A11 (+) and J102-A10 (-) on the DC
controller PCB. Does the voltage change
from about 0 to about 24 and then to about 0
V when the Start key is pressed?
Check the wiring from the DC
controller PCB to the counter;
if normal, replace the counter.
Replace the counter.
Replace the DC controller
PCB.
Actions
ChecksStep
Cause
Yes/No