Epson TM-FX2180 Service Manual page 40

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