Disconnect AC power before doing any repair work.
TO LOCATE THE DEFECTIVE BOARD
- Is there 15V at pin [1] of [CN A16 on A board]?
- If NO; check the cable between A6 and A board and P6 on P board.
- If yes; is there a sound waveform at pin 1 and at pin 4 of CN A12 on the A board?
- If No; 'A' board is defective.
- If yes; check speakers. Make sure A12 is properly seated.
