Specifications
REV.-A
Table
=.
Rebair of the Main Circuit Board (Continued)
‘?
‘)
)
)
——
—r——
.
Problem
Symptom Cause
Checkpoint
Solutlon
The carnage
Carnage
Iclo
Is
Replace
operates
operation
Is
defectrve
Iclo
abnormally
unstable(lack
of torque)
Self-test
Self-test
w
not
The CPU can
Measure the voltage at
pm
59(Vref)
of
Adjust
VR1
prmtmg
IS
executed
not measure
IC21
The normal voltage
IS
4741 V
(Refer to
abnormal
the voltage on
43)
the
+35V
hne
Icll
Is
At IC11, check the input signal at
pm
Replace
defective
101 and the output signal at
pm
46
IC4D
A
particular IC4
-
IC9
Is
For example, check the output
signal
at Replace
IC4
dot
IS
not
defecttve
pm2
and the out put signal at
pm3
wtth
-
IC9
being printed
IC4
Paper
Is
not
The paper
IC3
Is
Check the input signal at
pml
and the
Replace
IC3
led
normally
does not feed,
defectwe
output signal at
pm2
or the feed
pnch
IS
abnormal
5-16