The Blanking Exposure Lamp Fails To Turn On; The Pre-Exposure Lamp Fails To Turn On - Canon NP6251 Service Manual

41. The blanking exposure lamp fails to turn on.

Cause Step
DC controller 1
PCB
Blanking 2
exposure lamp
DC controller
PCB

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

Cause Step
DC controller 1
PCB
Pre-exposure
lamp PCB
COPYRIGHT © 1997 CANON INC.
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Checks
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?
Replace the blanking exposure
lamp. Does the new lamp turn on
correctly?
Checks
Set the meter to the 30VDC
range. Does the voltage between
J103B-2 (–) and GND change
from 24 to 0 V when the Copy
Start key is pressed?
CANON NP6350/NP6251 REV. 0 JULY 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
controller 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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