Epson Stylus 820 Service Manual page 126

Stylus Color 11s /Stylus 820
5.2 Unit-Repair - C160 Power Supply Board
This section describes how to repair the C160 power supply board and main board. The table below
provides various symptoms, likely causes, and check points. The checkpoints refer to waveforms,
resistances, and other values to check to evaluate the operation of each component.
Condition
Printer does not
operate at all. dead.
Rev. A
air of the C160
Checkpoints
Cause
F1 is open.
Check
the
open. T1 coils using the
T1 is Check
Check the wave-form at the drain of Q1.
u
Q2 or Q3 is Check the wave-form at the drain
broken.
of Q2 and Q3.
I
Check the wave-form at 3-pin of PC1.
1
.4962 is Check the oscillation at 5-pin of IC51.
Troubleshooting
Solution
Replace F1.
Replace TI.
tester.
Replace Q1.
I
Replace Q2 or Q3.
Replace PC1.
1 I 1 1
I I
Replace IC51.
I
5-3