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Principles of Operation
Table 6-7. Repairing the C076 PSB Board Assembly (Continued)
Problem
CalIS@
Checkpoint
Solution
he +5 V line is
The +35 V line is
Check the
+35
V line.
Refer to the
ad.
bad.
items
described
above.
IC51
is bad.
Check the oscillation waveform (IC51 pin 5) and the
Replace
switching waveform (IC51 pin 8).
IC51.
Q51
or
Q52
is
bad.
Check the switching waveform at
Q52
emitter.
Replace
Q51
or
Q52.
Epson FX-870/1170
6-33