Canon PC420 - Pick-Up Fails; The Scanning Lamp Fails to Go on

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CHAPTER 4 TROUBLESHOOTING MALFUNCTIONS
7. Pick-up fails.
8. The scanning lamp fails to go ON.
Cause Step Checks YES/NO Remedies
1 Move the copyboard to the left
until it stops, and open the top
cover. Does the pick-up roller
rotate when the door switch is
turned ON and the Copy Start
key is pressed at the correct
pick-up timing?
YES See “Pick-Up Assembly” in
“Troubleshooting Feeding
Faults.”
Main motor (M1) 2 Is the main motor rotating? NO See “The main motor fails
to rotate.”
Pick-up sensor (Q131) 3 Does the copier operate nor-
mally when the pick-up sensor
(Q131) is blocked with paper?
YES Check the sensor lever.
Pick-up solenoid (SL1;
PC420/430/FC220),
Registration solenoid
(SL1; PC400/FC200)
4 Set the meter to the ‘30VDC’
range. Does the voltage
between J201-6 (+) and J201-7
(-) on the DC controller/DC
power supply PCB change to
about 24 V at pick-up timing?
YES Check the spring clutch in
the registration assembly
and pick-up assembly; if
normal, replace the
solenoid.
DC controller/
DC power supply PCB
NO Check the wiring from the
solenoid to the DC con-
troller/DC power supply
PCB; if normal, replace
the DC controller/DC
power supply PCB.
Cause Step Checks YES/NO Remedies
Scanning lamp
(LA1-LA8)
1 Is the scanning lamp unit
attached correctly?
NO Re-attach the lamp unit.
Scanning lamp
(LA1-LA8)
2 Is the scanning lamp black? YES Replace the scanning
lamp unit.
DC controller/DC
power supply PCB
3 Is the connector of the scanning
lamp connected firmly?
YES Replace the DC controller/
DC power supply PCB.
Connector NO Re-connect the connector.