Epson FX 890 - B/W Dot-matrix Printer Service Manual page 44

Symptom Condition
The printer The CPU
dose not dose not
operate at operate.
all.
The carriage The carriage
operates dose not
abnormally. operate at
all.
Rev. B
Table 3-10. Repair of the C229MAIN (continued)
Cause
The CPU is
defective.
IC8 is
defective.
FX-1180/FX-880 Service Manual
Checkpoint
Check for the proper oscillator signal
at pin 26 or 27 of the CPU (IC3).
Figure 3-17. Clock Signal of CPU
Check for the proper CR motor
phase control signals at pin 5, 6, 16
and 17, and motor driving signals at
pin 1, 8, 11 and 18 of IC8.
Figure 3-18.
CR Motor Control Signal
Chapter 3 Troubleshooting
Solution
Replace the
C229MAIN
board.
Replace the
C229MAIN
board.
3-14