Epson FX 890 - B/W Dot-matrix Printer - Page 42

FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-1
2
Table 3-8. Repair of the C229PSB/PSE/PSH (continued)
Symptom Condition Cause Checkpoint Solution
The printer
dose not
operate at
all.
+35V line is
defective.
PC1 is
defective.
Check for the proper waveform at
pin 5 or 7 of PC1.
Figure 3-12. Waveform of PC1
Replace the
C229PSB/
PSE/PSH
board.
+5V line is
defective.
Regulator IC
(IC51) is
defective.
Check for the proper waveform at
pin 5 of IC51.
Figure 3-13. OSC of IC51
Replace the
C229PSB/
PSE/PSH
board.
Check for the proper waveform at
pin 9 or 10 of IC51.
Figure 3-14. Output of IC51
Replace the
C229PSB/
PSE/PSH
board.