I've been trying to trace an issue with my NAD t751.

1. Extremely low volume output on both left and right channels

2. No output when surround mode selected.

3. Doesn't matter if headphones or speakers

4. Doesn't matter which input.




I've bought an oscilloscope and I THINK I've traced it to the multichannel board. Audio goes from inputs to this board, then sent to the amplifier boards.

I get a signal from my freq generator to the input of the "m62447sp" IC.

It seems that the...