Epson 3000 Manual

A SERVICE OF

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Troubleshooting

Rev. A

5-1

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5.3 Repair of the C172 PSB/PSE Board at Component Level

This section contains information which enables you to repair and replace the components on the

electrical board (C172 PSB/PSE). Table 5-5 lists the potential causes for each symptom in order of

possibility, with which you are able to find and repair the defective part.

Table 5-5. Component Repair of the C172 PSB/PSE Board

Symptom Condition Cause Checkpoint Solution

The printer

does not

+42 VDC is

not output.

Fuse (F1) is

open.

Check visually if the fuse is good. Replace the fuse F1.

operate at all. Transformer

(T1) is open.

Check the transformer using a

multimeter.

Replace the

transformer T1.

Q1 is dead. Check the waveform at drain.

Waveform (1)

Replace the Q1.

Q2 or Q3 is

dead.

Check the waveform at corrector.

Waveform (2)

Replace the Q2 or Q3.

PC1 is dead. Check the voltage in lowering at

the Pin 5 or 7.

Waveform (3)

Replace PC1.

+5 VDC is

not output.

L4962 is dead. Check the reference waveform

at the Pin 5.

Waveform (4)

Replace the L4962.

Check the output waveform at the

Pin 7.

Waveform (5)