Canon LBP-CX Series Service Manual page 178

I
M-15. j The READY /WAIT indicator does not stop flashing.
J
Cause Step Check
Result
Measure
DC controller
1
Replace the DC controller PCB.
PCB
I
M-16.
j
The READY /WAIT indicator does not light.
j
Cause Step Check
Result Measure
Operator call, 1
Do the other LEDs light steadily? YES •If the PAPER OUT indicator lights
service call
steadily, put paper in the cassette.
• If the JAM indicator lights steadily,
take the jammed paper out of the
printer.
2 Have all the LEDs on the display YES
Go to M-14. Is the problem solved?
panel gone out?
If not, proceed to step 3.
DC controller PCB,
3 Does the READY /WAIT indicator YES Replace the DC controller PCB.
display unit light steadily when the circuit be-
NO
Check J201 on the DC controller
tween 1201-2 (RDYL) and J208-6
PCB and TB 18 on the display PCB
(GND) on the DC controller PCB
for good contact. If contact is good,
is shorted?
check whether +5VDC is supplied
between TB18-l and 1208-6 (GND)
on the DC controller PCB. If so,
replace the display unit. If not, go
to M-l.
M-17. Printing does not start when a TRUE print command (PRNT) is input.
Cause Step Check
Result Measure
Cable 1 Is 1202 on the DC controller con- NO
Connect the cable.
nected with the cable from I/O
connector J 12?
Operator call, 2 Does the READY /WAIT indicator NO
Go to M-16.
service call
light steadily?
DC controller PCB
3
Is test printing executed, and a print
NO
Replace the DC controller PCB.
composed of vertical lines delivered?
Is the problem solved? If not, check
the external device (user designed
interface PCB).
YES
Check J202 on the DC controller
PCB and I/O connector J2 for good
contact. If contact is good, replace
the DC controller PCB.
COPYRIGHT
©
BY CANON INC. CANON LBP·CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPON)
7-37