M-2. The Main Motor Does Not Rotate; M-3. The High-Voltage Power Supply Does Not Provide Power - Canon LBP-CX Series Service Manual

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M-2. jThe main motor does not rotate.
I
Cause
Step
Check
Result
Measure
Drive component
1
Remove the rear panel of the
YES Check that all gears mesh correctly.
printer. Does the main motor begin
rotating as soon as the test printing
is executed while the READY
I
WAIT indicator lights continuously?
Main motor
2 Does the voltage between 1503-6
YES Replace main motor M 1.
and 1503-5 (GND) on the DC power
NO Check all connections and wires
supply and main motor driver PCB
to main motor M 1. Is the problem
vary from OV to about +13VDC
solved? If not, proceed to step 3.
when the same operation as in step
1 is performed?
DC controller PCB 3
Does the voltage between 1208-1
YES
Check 1208 on the DC controller
(DRMD) and 1208-3 (GND) on the
PCB and 1502 on the DC power
DC controller PCB vary from about supply
&
main motor driver PCB for
+8VDC to about OV when the
good contact. Repair any poor con-
same operation as in step 1 is
tacts. Is the problem solved? If not,
conducted?
proceed to step 5.
NO
Replace the DC controller PCB.
DC power supply
4 Does the voltage between 1502-1
YES Replace the DC power supply &
& main motor
(DRMD) and 1502-3 (GND) on the main motor driver PCB.
driver PCB DC power supply and main motor
driver PCB vary from about +8VDC
to about OVDC when the same
operation as in step 1 is performed?
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M-3
I
The high-voltage power supply does not provide power.
J
Cause Step Check
Result
Measure
Drive component
1 Remove the rear panel of the
NO Go to M-2.
printer. Execute the test printing
while the READY /WAIT indicator
lights continuously. Does the main
motor begins rotating immediately?
DC power supply
2 Is the voltage between 1601-7
NO
Check the wires between the follow-
& main motor
(HVRST) and 1601-1 (GND) on
ing connectors for good contact.
driver PCB
the high-voltage power supply
Repair any problem with poor
about OVDC when the power is
contact.
switched ON?
• 1211 on the DC controller PCB
and 1601 on the high-voltage
power supply
• 1208 on the DC controller PCB
and 1502 on the DC power supply
& main motor driver PCB
Is the problem solved?
If not, replace the DC power supply
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& main motor driver PCB.
COPYRIGHT
©
BY CAllOll INC. CAMOll LBP-CX SERIES REV.2 JULY 1985 PRlllTEO IN JAPAN (IMPRIME AU JAPON)
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