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Principles of Operation
Table 6-7. Repairing the C076 PSB Board Assembly (Continued)
Problem
cause
Checkpoint Solution
The voltage of the Q3,
ICl,
PCl,
Check the voltage waveforms at Q3.
Replace Q3,
t35 V line is below PC2 or
ZD51
is
ICl,
PCl,
the specified value.
bad.
PC2 or
zD51.
Q2 is bad. Check the voltage waveforms at Q2.
Replace Q2.
6-32
Epson
FX-870/1170