Epson 440 Manuale Utente
Chapter 5 Troubleshooting
Rev. A
5-9
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.
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
Condition
Cause
Checkpoint
Solution
The printer
does not
operate at all.
does not
operate at all.
+42V line is
dead.
dead.
F1 is open.
Check F1 by using a
tester.
tester.
Replace F1.
Transformer coils
are open.
are open.
Check the waveform
at the drain of Q1.
at the drain of Q1.
Replace T1.
Switching FET (Q1)
is dead.
is dead.
Check drain side.
Replace Q1.
Feed back
transistor(Q2, Q3)
are dead.
transistor(Q2, Q3)
are dead.
Check corrector side.
Replace Q2
or Q3.
or Q3.
+42 V line is
abnormal.
abnormal.
Check following parts.
ZD87, ZD83
ZD51,ZD81
•`
ZD86
PC1
Replace suitable
parts.
parts.
Table 5-5.C206PSB Power Supply Board