Troubleshooting Malfunctions - Canon LBP-CX Series Service Manual

IV. TROUBLESHOOTING MALFUNCTIONS
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If air is blowing through the louver when the power is switched ON, start from step 8.
Cause
Step
Check Result Measure
Power cord l Is the printer plugged in? NO Plug it in.
Upper main body
2
Is the printer firmly closed? NO
Close it.
Line voltage 3 ls the required line voltage supplied NO
Tell the operator that nothing is
to the outlet?
wrong with the printer. If power is
supplied at a lower voltage, suggest
that the customer install a line-voltage
regulator.
Circuit breaker 4
Is circuit breaker CB 1 open?
YES
Reset the circuit breaker. (If the
circuit breaker breaks its connection
as soon as it is reset, excessive current
may be flowing. Check the circuit.)
5 Confirm that the power is switched NO Replace circuit breaker CB 1 .
OFF. Unplug the printer. Open the
upper half of the printer and
disconnect JI 05 on the AC driver
PCB. Confirm that circuit breaker
CB 1 is reset. Is CB 1 conducting?
Noise filter,
6 Plug the printer in and turn it ON. NO
Check noise filter NFl, main switch
main switch, Is line voltage supplied between
SWl, and the power cord (and plug).
power cord
TBlOl-1 and TB102-l?
Replace as required.
Prior to checking, be sure to set the
multimeter to the correct AC
voltage measuring range.
Door switch, 7
Switch the power OFF. Unplug the
NO
Replace MSl and/or MS2.
MSl, MS2 printer. Connect JI 05 to the AC
driver PCB. Plug the printer in
and turn the main switch ON. Is
AC voltage supplied between
JI05-l and JI05-2 of the AC
driver when the door switch is
actuated with a screwdriver?
AC driver PCB 8 Is AC voltage supplied between NO
Replace the AC controller PCB.
(AC controller PCB
JI 03-1 and JI 03-2 of the AC
Is the problem solved? If not, replace
and fixing roller
controller when the door switch is the fixing roller heater safety PCB.
heater safety PCB)
actuated with a screwdriver?
DC power supply
9 Shut the upper half of the printer
YES
Proceed to step 22.
and remove the top cover.
Are the specified DC voltages
j supplied between the 1502 pins on
the DC power supply & main motor
driver PCB listed in the table below?
Check pin
Voltage
1502-4and1502-8 (GND) 24-35
1502-9 and 1502-8 (GND) 24
1502-1and1502-6 (GND) 5
1502-5 and 1502-6 (GND)
-5
1502-2 and 1502-3 (GND) 20-30
7-24
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BY CANON INC. CANON LBP·CX SERIES HEY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONI