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REV.-A
Table 5-6. SIEPS/SANPSE Power Board Unit Repair
Problem
Symptom
Cause
Checkpoint
Solution
The printer
The +24V
Transformer
Measure the resistance of T1 transformer
Replace T1.
does not
line is dead.
coils are
coils.
operate at all.
open.
4-3,6-2, 11-12.
Q 1 is dead.
Check the voltage waveforms at Q 1
Replace Q 1.
(collector).
D"
I'-
r-
....
l"-
t-
. .
kl>l
>50
V
<20I.us
The voltage
Q3, IC1, PC1,
Check the voltage waveforms at Q3
Replace Q3,
on the +24V
or ZD20 is
(collector).
IC 1, PC 1, or
line is below
dead.
ZD20.
normal.
I
>ZV
<20
}JS
Q2 is dead.
Check the voltage waveforms at the Q2
Replace Q2.
(collector).
r-
J
J
1I
I
lU.
11
J
L
I
L1
IJU. J
10.0;
......
.~
r
>'iN
<20
')JS
5-10
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