Epson fx-2180 Service Manual page 39

FX-2180 Service Manual
Table 3-14. Repairing C244 MAIN Board Assembly (Continued.)
Problem Cause
• Check the input signal
A IC1 or
particular head drive waveform (CH 1) at BASE of
dot fails transistor
each transistor.
(Q2 ∼ Q19)
• Check the output signal
to print.
is
waveform (CH 2) at
defective.
COLLECTOR of each
transistor.
Figure 3-18. Waveform 9
Rev. A
Checkpoint Solution
• If the input
signal is not
correct,
replace the
main board.
• If the output
signal is not
correct,
replace the
transistor or
the main
board.
CH 1
CH 2
Troubleshooting
3-11