Canon LBP-CX Series Service Manual page 167

Cause Step Check
Result Measure
DC controller 16 Disconnect connectors J215, J212, YES Check the wires between the shorted
loads J210,J216,J213,J211,J208,J206 connectors and the loads for conti-
on the DC controller PCB. Are any
nuity. If none are shorted, replace
of the circuits between the following the loads (sensors, other components).
connectors (cables attached) If a short is found, remove the cause
shorted? of the short.
J215-3 and J215-l, J215-5 and
J215-l,
J212-2 and J212-3, J210-l and
J210-5,
J210-3 and J210-5, J210-7 and
J210-5,
J216-3 and J216-l, J213-8 and
J213-l,
J21 l-6 and J21 l-l, J206-l and
J206-2
AC driver PCB
17 Is J212-2 and J212-3 of the YES Check the wiring between J 104 and
(fixing roller heater
connector (cable attacched)
J2 l 2 for a short. If it is OK, replace
safety PCB and AC
shorted? the AC controller PCB or fixing roller
controller PCB)
heater safety PCB.
18 Were J502-7 and J502-6 shorted? NO Proceed to step 20.
-
Laser unit, display 19 Disconnect J201 and J204 on the
YES · If the circuit between J201-l and
PCB DC controller PCB. Are J201-l and J208-8 are shorted, check the wiring
J208-8, or J204-4 and J204-5,
between J201and118 and the
shorted? display PCB for a short.
· If the circuit between J204-4 and
J204-5 are shorted, check the wiring
between J204 and TB3, and between
J204 and TB4 for a short. If there
are no shorts,, replace the laser unit.
20
Were J502-2 and J502-3 shorted? NO Proceed to step 22.
Laser unit 21
Disconnect J204 on the DC con- YES
Check the wiring between J204 and
troller PCB. Are J204-l and J204-4 TB3 and TB4 for a short. If there are
of the connector (cable attached)
no shorts, replace the laser unit.
shorted?
Connections 22 Plug in all the connectors on the NO
Check wiring between J502 on the
DC power supply
&
main motor
DC power supply and main motor
driver PCB and DC controller PCB.
driver PCB and J208 on the DC
Confirm that the circuit breaker
controller PCB for good contact or
has been reset and the upper half of scratches on the wire il,lsulation.
the printer has been closed. Switch
YES Replace the DC controller PCB.
the printer ON. Are the specified
DC voltages shown in the table
below supplied between the J208
pins on the DC controller PCB?
Check pin Voltage
1208-4
and
1208-8 (GND)
24-35
1208-9
and
1208-8 (GND) 24
1208-7
and
1208-6 (GND)
5
1208-5
and
1208-6 (GND)
-5
1208-2
and
1208-8 (GND) 20-30
7-26
COPYRIGHT
©
BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTED Ill JAPAll (IMPRIME AU JAPOll)