The Pre-Exposure Lamp Fails To Turn On; The Scanning Lamp Fails To Turn On - Canon GP215 Service Handbook

TROUBLESHOOTING MALFUNCTIONS
33

The pre-exposure lamp fails to turn ON.

Cause Step
Pre-exposure 1
lamp
DC controller
PCB
34

The scanning lamp fails to turn ON.

Cause Step
Scanning lamp 1
Scanning lamp 2
installation
Connector 3
(poor contact)
DC controller 4
PCB
Composite
power supply
PCB
4–20
Checks
Does the voltage between the
connector J107-A11 (+) and
the connector J107-A12 (–) on
the DC controller PCB change
from 0 V to 24 V when the
Copy Start key is pressed?
Checks
Are both ends of the scanning
lamp black?
Is the scanning lamp installed
correctly?
Is the connection of the relay
connectors J20 and J95 nor-
mal? Further, is the connection
of the connector J802 on the
composite power supply PCB
normal?
Replace the DC controller
PCB. Is the problem corrected?
Yes/No
YES Check the wiring from the DC
controller PCB to the pre-expo-
sure lamp; if normal, replace
the pre-exposure lamp.
NO Replace the DC controller
PCB.
Yes/No
YES Replace the scanning lamp.
NO Re-install it.
NO Re-connect it.
YES End.
NO Replace the composite power
supply PCB.
Action
Action