Epson Stylus COLOR 3000 Service Manual - Page 138

Repair of the C172 PSB/PSE Board at Component Level, Symptom, Condition, Cause, Checkpoint, Solution

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Troubleshooting 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 The printer does not operate at all. +42 VDC is not output. Fuse (F1) is open. Transformer (T1) is open. Q1 is dead. Checkpoint Solution Check visually if the fuse is good. Replace the fuse F1. Check the transformer using a multimeter. Check the waveform at drain. Replace the transformer T1. Replace the Q1. Q2 or Q3 is dead. Waveform (1) Check the waveform at corrector. Replace the Q2 or Q3. PC1 is dead. Waveform (2) Check the voltage in lowering at Replace PC1. the Pin 5 or 7. Waveform (3) +5 VDC is L4962 is dead. Check the reference waveform Replace the L4962. not output. at the Pin 5. Waveform (4) Check the output waveform at the Pin 7. 5-10 Waveform (5) Rev. A

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Troubleshooting
Rev. A
5-10
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)