Is the sound output from both channels (L, R)? YES Normal
NO
No sound from either channel. YES Is 9V present at IC301 pin 31? YES Is the audio signal (including sampling output components) output to IC151 pins 1 and 7 during playback? YES Is the audio signal output at IC301 pins 3 and 30 during playback? YES Check the muting circuit.
NO
Compare the L-ch and R-ch to locate the defctive point.
NO Check the viciniyt of the Q321 audio power supply. NO
