3-9
ELECTRICAL TROUBLESHOOTING GUIDE
3. POWER SUPPLY ON AMP BOARD
No 3.3 VA
Check SMPS part.
Check IC301 working status.
Check IC302 working status.
Check IC303 working status.
Check IC700 working status.
Check IC603 working status.
Check IC602 working status.
Is 20 V supplied to IC603 Pin2?
Is 3.3 V at IC301 Pin97?
Is 3.3V at IC302 Pin1?
Is 3.3 V at IC303 Pin8?
Is 9.5 V at L608?
Is 3.3 V at L600?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
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