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COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
13-111
CHAPTER 13 TROUBLESHOOTING
72 The pre-exposure lamp fails to turn on.
Step
1
2
Action
Check the wiring from
the DC controller PCB
to the pre-exposure
lamp PCB; if normal,
replace the pre-
exposure lamp PCB.
Replace the DC
controller PCB.
Check the wiring from
the DC controller PCB
to the pre-exposure
lamp PCB; if normal,
replace the pre-
exposure lamp PCB.
Checks
Select COPIER>1/O>IP in service mode.
Does bit 6 of address P017 change from
'0' to '1' when the Copy Start key is
pressed?
Set the meter to the 30 VDC range. Does
the voltage between J504-A1 (+) on the
DC controller PCB and GND change
from 0 to 24 V when the Copy Start key
is pressed?
Yes/No
YES
NO
YES
Cause
Pre-exposure
lamp PCB
DC controller
PCB
Pre-exposure
lamp PCB
73 The scanning lamp fails to turn on.
Step
1
2
3
4
Action
Check the connector. It
may have poor contact.
Disconnect the power
plug, and mount the
lamp correctly.
Check the AC line up
to the relay PCB; if
normal, replace the
relay PCB.
Check the wring; if
normal, replace the
inverter PCB.
Check the wiring; if
normal, replace the DC
controller PCB.
Checks
Select COPIER>FUNCTION>MISC-
R>SCANLAMP in service mode. Does
the scanning lamp remain on for 3 sec
when the OK key is pressed?
Is the scanning lamp (LA1) mounted
correctly?
Measure the voltage of J1001-1 on the
inverter PCB. Is it 38 V?
Measure the voltage of J506-B11 on the
DC controller PCB. Does it change from
5 to 0 V when the control panel power
switch is turned on?
Yes/No
YES
NO
NO
YES
NO
Cause
Connector
Lamp
Relay PCB
Inverter PCB
DC controller
PCB