Canon CLC 1120 Service Manual page 650

27 E202
Note: No code id indicated, and keys are disabled.
Cause
Original scanner
HP sensor (PS1)
Original scanner
motor (PM15)
Original scanner
motor driver PCB
CPU PCB
28 E208
Cause
DC power supply
PCB
Connector, wiring
Original scanner
motor driver PCB,
CPU PCB
COPYRIGHT © 1999 CANON INC.
Step
1 Is the original scanner HP sensor
normal? (See the instructions on
how to check photointerrupters.)
2 Replace the original scanner motor.
Is the problem corrected?
3 Replace the original scanner motor
driver PCB. Is the problem
corrected?
Step
1 Is power present at J380 on the
original scanner motor driver PCB?
Voltage
+5V J380-2
+8.8V J380-4
+12V J380-6
+40V J380-8
2 Is there a fault in the connection
between J602 on the original
scanner motor drive PCB and
J2003 on the CPU PCB?
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Checks
Checks
(+) (-)
J380-1
J380-3
J380-5
J380-7
Yes/No Action
NO Replace the sensor
(PS1).
YES End.
YES End.
NO Check the wiring from
the original scanner
motor driver PCB to the
CPU PCB; if normal,
replace the CPU PCB.
Yes/No Action
NO Check the wiring; if
normal, replace the DC
power supply PCB.
YES Connect the connectors
properly.
NO Replace the following
parts in turns:
· original scanner motor
driver PCB
· CPU PCB
13-123