Epson FX-2180

FX-2180 Service Manual Troubleshooting
Rev. A
3-11
Table 3-14. Repairing C244 MAIN Board Assembly (Continued.)
Problem Cause Checkpoint Solution
A
particular
dot fails
to print.
IC1 or
head drive
transistor
(Q2 ∼ Q19)
is
defective.
• Check the input signal
waveform (CH 1) at BASE of
each transistor.
• Check the output signal
waveform (CH 2) at
COLLECTOR of each
transistor.
CH 1
CH 2
Figure 3-18. Waveform 9
• 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.