Epson fx-2180 Service Manual page 38

FX-2180 Service Manual
Table 3-12. Repairing C244 MAIN Board Assembly (Continued.)
Problem Cause
• Check the input signal
The CPU or
carriage IC9 is
waveforms (CH 1) at pins 5,
operation defective.
6, 16 and 17 of IC9.
• Check the output signal
is
abnormal.
waveforms (CH 2) at pins 1,
8, 11 and 18 of IC9.
CH 2
Figure 3-15. Waveform 7
IC1 is Check the output signals at
defective pins 62, 63, 64 and 65 of the
IC1.
Rev. A
Checkpoint Solution
• If the input
signal is not
correct,
replace the
main board.
• If the output
signal is not
correct,
replace IC9 or
replace the
main board.
CH 1
If the output
signal is not
correct, replace
the main
board.
Table 3-13. Repairing C244 MAIN Board Assembly (Continued.)
Problem Cause
• Check the input signal
Paper IC1, IC2
feed is or IC12 is
waveforms (CH 1) at pins 26
abnormal. defective.
and 43 of IC12.
• Check the output signal
waveforms (CH 2) at pins 3,
6, 18 and 21 of IC12.
Figure 3-16. Waveform 7
No data is CPU is Check the output signal
printed. defective. waveforms at pins 15 or 19 of
IC2.
Figure 3-17. Waveform 8
Troubleshooting
Checkpoint Solution
• If the input
signal is not
correct,
replace the
main board.
• If the output
signal is not
correct,
replace IC12
or replace the
main board.
CH 1
CH 2
If the output
signal is not
correct, replace
the main
board.
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