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Table 5-6. SEIPS/SANPSE Power Board Unit Repair (Continued)
REV.-A
Problem
Symptom
Cause
Checkpoint
Solution
The printer
The voltage
The +24V
Check the +24V line.
does not op-
at +5V line
line is dead.
erate at all.
is dead.
IC20 is dead.
Check the oscillation waveform and the
Replace IC20.
switching waveform.
~
J
1
J
Ij
A
,
/
V
"
/
/
J
" /
V
V
V
V
Ij
>
1V
<20
~s
Oscillation Waveform (IC20, 5Pin)
r
<J,
:
:(
'r
~
~U.
w
......
>10
rv
<10
IJJS
Switching Waveform (IC20, 8Pin)
020 or 021
Check the switching waveform.
Replace
is dead.
either 020 or
021.
-!""""
-
........
>10
V
>2
)JS
020, Collector
5-11
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