The Blanking Exposure Lamp Fails To Turn On; The Pre-Exposure Lamp Fails To Turn On - Canon NP6260 Service Manual

42. The blanking exposure lamp fails to turn on.

Cause Step
DC controller
PCB
Blanking
exposure lamp
DC controller
PCB

43. The pre-exposure lamp fails to turn on.

Cause Step
DC controller
PCB
Pre-exposure
lamp PCB
COPYRIGHT © 1997 CANON INC.
Checks
1 Remove the blanking exposure
lamp, and connect the connector.
Select 'BLANK' in service mode
( ). Does the blanking
4
exposure lamp turn on when the
user mode key is pressed?
2 Replace the blanking exposure
lamp. Does the new lamp turn on
correctly?
Checks
1 Set the meter to the 30VDC
range. Does the voltage between
J103-B2 (–) and GND change
from 24 to 0 V when the Copy
Start key is pressed?
CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
YES Check the wiring from
the blanking exposure
lamp to the DC controller
PCB; if normal, replace
the DC controller PCB.
YES End.
NO Check the wiring from
the blanking exposure
lamp to the DC controller
PCB; if normal, replace
the DC controller PCB.
YES/NO Action
NO Replace the DC con-
troller PCB.
YES Check the wiring from
the DC controller PCB to
the pre-exposure lamp
PCB; if normal, replace
the pre-exposure lamp.
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