Request for help in diagnosing a fault in a Sony TA-N55ES/N330ES amplifier.
Right (R) channel not working.
Components found faulty during diagnosis:
- Short-circuited ICs: Q301, Q302, Q303, Q304, Q305
- Burnt resistors: R306 and R305
- RT301: Open circuit
- Issue: On pins 10 and 11 of the STK3102-3, we measure + and -59V DC (measured with respect to ground).
- We isolated pins 10 and 11 of the STK3102-3 from the amplifier circuit, but we still measure 59V DC on them.
- We removed ICs Q301, Q302, Q303, Q304, and Q305 to isolate the amplifier section.
- Correct measurement: On pins 5 and 6 of the STK3102-3 (Left channel), we measure + and -1.2V DC, which is correct.
- Resistors and capacitors in the STK3102-3 bias circuit are within correct values:
R301 & C301, R302 & C302, C329, C307, C304, C305, C306, C303, C308 - Continuity test passed on the -B and +B power lines.
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Request for help in diagnosing a fault in a Sony TA-N55ES/N330ES amplifier.
Right (R) channel not working.
Components found faulty during diagnosis:
- Short-circuited ICs: Q301, Q302, Q303, Q304, Q305
- Burnt resistors: R306 and R305
- RT301: Open circuit
- Issue: On pins 10 and 11 of the STK3102-3, we measure + and -59V DC (measured with respect to ground).
- We isolated pins 10 and 11 of the STK3102-3 from the amplifier circuit, but we still measure 59V DC on them.
- We removed ICs Q301, Q302, Q303, Q304, and Q305 to isolate the amplifier section.
- Correct measurement: On pins 5 and 6 of the STK3102-3 (Left channel), we measure + and -1.2V DC, which is correct.
- Resistors and capacitors in the STK3102-3 bias circuit are within correct values:
R301 & C301, R302 & C302, C329, C307, C304, C305, C306, C303, C308 - Continuity test passed on the -B and +B power lines
