Canon CLC 1120 Service Manual page 662

Cause
DC power
Lamp regulator
CPU PCB
COPYRIGHT © 1999 CANON INC.
Step
6 Turn off the power switch, and
connect J9. Set the meter range to
50 VDC, and turn on the power
switch. Is 24 VDC present between
J450-2 (+; 24 V) and J450-1 (-;
GND)?
7 Set the meter range to 50 VDC, and
connect the probes to J450-10 (+;
LAON) and J450-1 (-; GND) of the
lamp regulator. Does the voltage
change from about 24 to about 0 V
when the Copy Start key is
pressed?
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Checks Yes/No Action
NO See "DC power is
absent."
YES Replace the lamp
regulator.
NO Check the wiring from
J450 to J2004 on the
CPU PCB; if normal,
replace the CPU PCB.
13-135