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M-14. All Leds On The Display Panel Do Not Light - Canon LBP-CX Series Service Manual

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Cause
Step
Check
Result
Measure
Laser unit
3
Unplug 1204 on the DC controller
NO
Replace the laser unit.
PCB after switching the printer
OFF. Measure the resistance
between 1204-1 and 1204-2 of
the connector (cable attached).
Is it 40Q -
ssm
DC controller PCB,
4
Measure the resistance between
YES
Replace the DC controller PCB.
laser unit
1204-3 and 1204-4 on the connector
(cable attached). Is it Skil - lSkQ
at normal temperature?
After measurement, plug in 1204 on
NO
Replace the laser unit.
the DC controller PCB.
M-14.1 All LEDs on the dispaly panel do not light.
I
Cause
Step
Check
Result
Measure
EP cartridge
l
Is an EP cartridge installed in the
NO
Install the EP cartrdige.
printer?
Power momen-
2
Is the problem solved when the
YES
Finished, because the power momen-
tarily cut,
power is switched ON again?
tarily cut the detection function,
BD signal
which worked normally.
malfunction
If
this problem occurs frequently, the
cause may be attributed to BD mal-
function. In this case, go to M-12.
Self-diagnosis
3
Does the main motor begin rotat-
YES
Wait until a sheet of paper is deliv-
ing and actuate paper feeding as
ered to the print tray.
soon as all LEDs on the display
If
paper comes out, it means that the
panel go out?
pickup sensor has detected the paper
in the paper transport area, which
causes the self-diagnosis function to
deliver the printed paper.
TG signal
4
Press the test switch on the left
NO
Go to M-2. Is the problem solved?
. malfunction
panel while the READY/WAIT
If
not, replace the DC power supply
indicator lights steadily.
and main motor driver PCB.
Is a pulse applied between 1208-12
(TG) and 1208-3 (GND) on the DC
controller PCB? Check it with a
Logic Tone (CK-0400).
DC power supply
5
Is +5 VDC supplied between 1201-1
NO
Go to M-1.
and 1208-6 (GND) on the DC con-
troller PCB ?
7-36
COPYRIGHT
©
BY CANON INC. CANON LBP·CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ

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