Epson FX-870

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