Canon PC400 Service Manual - Page 172

The main motor fails to rotate., The copyboard fails to move., Main motor M1

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CHAPTER 10 TROUBLESHOOTING 9. The main motor fails to rotate. Cause Main motor (M1) DC controller/DC power supply PCB Step Checks 1 Set the meter to the '30VDC' range. Does the voltage between J903-1 (+) and J903-2 change from about 0 V to about 20 V according to the operation of the main motor? YES/NO Remedies YES Replace the main motor. NO Check the wiring from the motor to the DC controller/ DC power supply PCB; if normal, replace the DC controller/DC power supply PCB. 10. The copyboard fails to move. Cause Main motor (M1) Copyboard, Copyboard drive assembly DC controller/DC power supply PCB Copyboard drive solenoid (SL2) Step Checks 1 Is the main motor rotating? 2 Push the copyboard by hand. Does it move smoothly? YES/NO Remedies NO See "The main motor fails to rotate." NO Check the copyboard and copyboard drive assembly. 3 Set the meter to the '200 Ω' range. Disconnect J902 from the copyboard drive solenoid, and measure the resistance between terminals of SL2. Is it about 120 Ω? YES NO Check the wiring from the solenoid to the DC controller/DC power supply PCB; if normal, replace the DC controller/DC power supply PCB. Check the solenoid (SL2). 10-28 COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-28
CHAPTER 10 TROUBLESHOOTING
9.
The main motor fails to rotate.
10. The copyboard fails to move.
Cause
Step
Checks
YES/NO
Remedies
Main motor (M1)
1
Set the meter to the ‘30VDC’
range.
Does the voltage
between J903-1 (+) and J903-2
change from about 0 V to about
20 V according to the operation
of the main motor?
YES
Replace the main motor.
DC controller/DC
power supply PCB
NO
Check the wiring from the
motor to the DC controller/
DC power supply PCB; if
normal, replace the DC
controller/DC power
supply PCB.
Cause
Step
Checks
YES/NO
Remedies
Main motor (M1)
1
Is the main motor rotating?
NO
See “The main motor fails
to rotate.”
Copyboard,
Copyboard drive
assembly
2
Push the copyboard by hand.
Does it move smoothly?
NO
Check the copyboard and
copyboard drive assembly.
DC controller/DC
power supply PCB
3
Set the meter to the ‘200
Ω
’
range.
Disconnect J902 from
the copyboard drive solenoid,
and measure the resistance
between terminals of SL2.
Is it about 120
Ω
?
YES
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.
Copyboard drive
solenoid (SL2)
NO
Check the solenoid (SL2).