Electrical Troubleshooting Guide - Aiwa HT-DV2300 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE -1/10

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1. Power(SMPS) Circuit
A.
No FLD
Is 5.2VA section working?
YES
Are D109, L103 open?
YES
Replace SMPS trans(T101).
Replace the inferior
components.
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NO
NO
Is 5.2V applied to IC102
Pin 1?
Is there a DC voltage at the
(+) terminal of BD101?
Is R102(R104) normal?
Is about AC 100V applied to
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2 9
8
No 5.2VA.
Check R127, 128.
(SHUTDOWN CKT)
Q Q
3 6 7 1 3
NO
YES
YES
IC101 Pin 3.
NO
Check IC101.
.
-58-
9 4 2 8
B.
No 5V_D
or 5V_A .
NO Is 5.2VA section working?
(Is the POWER CTL at
Pin6 High/low?)
YES
NO
Is oscillation present at the
Base of Q108?
YES
Replace Q108.
YES
Check D109, C123, R125,
R124.
1 5 0 5 8 2 9 9 4
NO
Replace BD101.
(Bridge rectifier)
NO
Replace R102.
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9 9
2 8 9 9