Canon CLC 5000, Service Manual

Page: 468 / 757

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON CLC5000 REV.0 JAN. 2001
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
5-111
4.1.5 E012
1) Does the photosensitive drum motor (M21) rotate during initial ro-
tation?
YES: Go to step 4.
Excess load
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?
YES: Put a finger through the primary charging assembly slot, and push
the blade support plate to correct the bend; then, slide out the pro-
cess unit.
Check if the photosensitive drum should be subject to excess load.
Replace the cleaning blade as necessary.
Photosensitive drum motor (M21)
DC controller PCB
3) Set the meter to the 5VDC range, and measure the voltage between
J2225B-2 (+; M210N) and J2225B-3 (–; 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?
YES: Replace the photosensitive drum motor (M21).
NO:
Check the wiring from J2225B to the drum motor; if normal, re-
place the DC controller PCB.
DC controller PCB
Photosensitive drum motor (M21)
4) Set the meter to the 5VDC range, and measure the voltage between
J2226A-12 (+; M21PLL*) and J2226A-14 (–; GND) on the DC con-
troller PCB.
Turn OFF and then ON the power switch. Does the voltage change
from about 3 V to about 0 V when the main motor starts to rotate?
YES: Replace the DC controller PCB.
NO:
Check the wiring from J2225B to the photosensitive drum motor;
if normal, replace the photsensitive drum motor.