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Epson FX-870/1170 User Manual

Page 148

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Principles of Operation

Table 6-7. Repairing the C076 PSB Board Assembly (Continued)

Problem

Checkpoint

Solution

he V line is

The

V line is

Check the

V line.

Refer to the

ad.

bad.

items
described
above.

is bad.

Check the oscillation waveform

pin 5) and the

Replace

switching waveform (IC51 pin 8).

or

is

bad.

Check the switching waveform at

emitter.

Replace

or

Q52.

Epson FX-870/1170

6-33

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