Epson FX-880 Service Manual page 42

Condition
Symptom
+35V line is
defective.
The printer
dose not
operate at
all.
+5V line is
defective.
Rev. A
Table 3-7. Repair of the C229PSB/PSE (continued)
Cause
PC1 is
defective.
Regulator IC
(IC51) is
defective.
Checkpoint
Verify the waveform at pin 5 or 7 of
PC1.
Figure 3-12. Waveform of PC1
Verify the waveform at pin 5 of IC51.
Figure 3-13. OSC of IC51
Verify the waveform at pin 9 or 10 of
IC51.
Figure 3-14. Output of IC51
FX-880 Service Manual
Chapter 3 Troubleshooting
Solution
Replace the
C229PSB/
PSE board.
Replace the
C229PSB/
PSE board.
Replace the
C229PSB/
PSE board.
3-12