Epson Stylus Color 640 Service Manual page 89

Epson stylus color ink jet printer service manual
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EPSON Stylus Color 440/640/740
Symptom
Condition
The printer does
+42V line is dead.
not operate at all.
Chapter 3
Troubleshooting
Table 3-5. Repair of the C206/C257 PSB/PSE Board
Cause
Checkpoint
F1 is open.
Check F1 by using a
tester.
Transformer coils are open. Check the waveform at the drain of Q1.
Switching FET (Q1) is
Check drain side.
dead.
Feed back transistor (Q2,
Check collector side.
Q3) are dead.
+42 V line is abnormal.
Check the following parts.
• ZD87, ZD83
• ZD51, ZD81–ZD86
• PC1
Revision A
Solution
Replace F1.
Replace T1.
Replace Q1.
Replace Q2 or Q3.
Replace suitable
parts.
89

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Stylus color 740Stylus color 460Stylus color 440

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