Unit Repair C206 Psb/Pse Board - Epson 440 Service Manual

5.3 Unit Repair C206 PSB/PSE Board

This section describes the problems related to the power supply board(C206 PSB/PSE). The table next
page provides various symptoms, likely causes, and checkpoints. The checkpoints refer to waveforms,
resistance, and other values to be checked to evaluate the operation of each component.
Symptom
The printer +42V line is
does not dead.
operate at all.
Rev. A
Table 5-5.C206PSB Power Supply Board
Condition Cause
F1 is open.
Transformer coils
are open.
Switching FET (Q1)
is dead.
Feed back
transistor(Q2, Q3)
are dead.
+42 V line is
abnormal.
Chapter 5 Troubleshooting
Checkpoint
Check F1 by using a
tester.
Check the waveform
at the drain of Q1.
Check drain side.
Check corrector side.
Check following parts.


ZD87, ZD83


ZD51,ZD81•`ZD86


PC1
Solution
Replace F1.
Replace T1.
Replace Q1.
Replace Q2
or Q3.
Replace suitable
parts.
5-9