Epson Stylus Scan 2000 - Page 81

EPSON Stylus Scan 2000
Revision A
Troubleshooting
Troubleshooting the Power Supply Board
80
Table 3-14. Troubleshooting the B101 PSB/PSE Board(TBD)
Symptom Condition Cause Checkpoint Solution
The printer does not
operate at all.
+42V line is dead.
F1 is open.
Check F1 by using a tester.
Replace F1.
Transformer coils are open. Check the waveform at the drain of Q1. Replace T1.
Switching FET (Q1) is dead.
Check drain side.
Replace Q1.
Feed back transistor (Q2, Q3)
are dead.
Check collector side.
Replace Q2 or Q3.
+42 V line is abnormal.
Check the following parts.
• ZD87, ZD83
• ZD51, ZD81–ZD86
• PC1
Replace suitable
parts.
Title: psq1.eps
Creator: Micrografx Graphics Engine
CreationDate: Thu Oct 31 20:30:14 1996
Title: psq1.eps
Creator: Micrografx Graphics Engine
CreationDate: Thu Oct 31 20:30:14 1996
Title: psq2.eps
Creator: Micrografx Graphics Engine
CreationDate: Fri Nov 01 08:42:39 1996