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EPSON FX-2180 Service Manual Chapter 3 Troubleshooting
3-10
Table 3-7. Repairing the Main Board Assembly (Continued)
Problem Cause Checkpoint Solution
Carriage
operation is
abnormal.
The CPU or
IC9 is
defective.
• Check the input signal
waveforms (CH 1) at
pins 5, 6, 16, and 17 of
IC9.
• Check the output signal
waveforms (CH 2) at
pins 1, 8, 11, and 18 of
IC9.
CH 1
CH 2
Figure 3-15. Waveform 8
• If an input
signal is not
correct,
replace the
main board.
• If an output
signal is not
correct,
replace IC9 or
the main
board.
IC1 is
defective.
Check the output signals at
pins 62, 63, 64, and 65 of
IC1.
If an output signal
is not correct,
replace the main
board.
Table 3-7. Repairing the Main Board Assembly (Continued)
Problem Cause Checkpoint Solution
Paper
feeding is
abnormal.
IC1, IC2, or
IC12 is
defective.
• Check the input signal
waveforms (CH 1) at
pins 26 and 43 of IC12.
• Check the output signal
waveforms (CH 2) at pins 3,
6, 18, and 21 of IC12.
CH 1
CH 2
Figure 3-16. Waveform 9
• If an input signal
is not correct,
replace the
main board.
• If an output
signal is not
correct, replace
IC12 or the main
board.
No data is
printed.
The CPU is
defective.
Check the output signal
waveforms at pin 15 or 19 of
IC2.
Figure 3-17. Waveform 10
If an output signal
is not correct,
replace the main
board.