Wonks wrote:cyrano.mac wrote:I've had a look at the pics.
The first thing I'd suspect, are the three ribbon cables in picture number two. These are known to develop cracks that induce the kind of intermittent connection problems you're experiencing.
I'd certainly have a close look at them, but as those ribbons connect the drive channel controls to the main PCB, and it's the clean channel that's currently stopped working, that makes them far less likely to be the culprit here. There's no need to take the clean signal circuit output onto the drive circuit board.
I haven't seen the schematics, just the pics...