E012 - Canon 1000 Service Manual

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
5

E012

Cause Step
Excess load
Drum motor
(M21)
DC controller
PCB
DC controller
PCB
Drum motor
7-92
COPYRIGHT © 2001 CANON INC.
Checks
1 Does the drum motor (M21) rotate
during initial rotation?
2 Slide out the primary charging
assembly, and check the condition of
the cleaning blade by the naked eye.
(Do not slide out the process unit.)
Is the cleaning blade bent?
3 Set the meter to the 5VDC range,
and measure the voltage between
J2226A-13 (+; M210N) and J2226A-
14 (–; GND) on the DC controller
PCB.
Turn OFF and then ON the power
switch. Does the voltage change
from about 5 V to about 0 V when the
main motor starts to rotate?
4 Set the tester to the 5VDC range,
and measure the voltage between
J2226A-12 (+; M21PLL*) and
J2226A-14 (–; GND) on the DC
controller PCB.
Turn OFF and then ON the power
switch. Does the voltage change
from about 3 V to about 0 V when
themain motor starts to rotate?
Yes/No
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
YES Go to step 4.
YES Put a finger through the
primary charging assem-
bly slot, and push the
blade support plate to
correct the bend; then,
slide out the process unit.
Check if the photosensi-
tive drum should be
subject to excess load.
Replace the cleaning
blade as necessary.
YES Replace the drum motor
(M21).
NO Check the wiring from
J2226A to the drum
motor; if normal, replace
the DC controller PCB.
YES Replace the DC controller
PCB.
NO Check the wiring from
J2226A to the drum
motor; if normal, replace
the drum motor.