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FX-2180 Service Manual Troubleshooting

Rev. A

3-11

Table 3-14. Repairing C244 MAIN Board Assembly (Continued.)

Problem Cause Checkpoint Solution

particular

dot fails

to print.

IC1 or

head drive

transistor

(Q2 ∼ Q19)

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.

Epson FX-2180 Service Manual

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