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Check the waveform at pin 12 of IC11.
NO Check / Replace Q1274,IC1101.
NORMAL Check / Replace IC11.
Check the voltage at pin 1,6 of IC301.
Check / Replace FR359,FR360,D339,D349.
Check the waveform at pin 19,20 of IC1113.
Check / Replace IC1113,Q1118,Q1121
Check / Replace IC301, D301.
Check the waveform at pin 21,22 of IC601.
Check / Replace IC601.
Check the waveform at pin 1,3 of IC602.
Check / Replace H/P JACK.
Check / Replace IC602.
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