system 1 no sound

p1899m

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So one of my system 1 cabs lost sound. I have tested the cartridge in another cab and that works fine and has sound. When I tuen the volume pot on the AR board I hear static so I'm pretty sure that board is out working/amplifying. So it leads me to believe my issue is on the main board. Any idea what components on the main board effect sound? Also tried a different known working AR board and got no sound so it's not the AR board for sure. Test mode says all audio is fine but I hear nothing so I'm guessing the test is not very thorough.

It would be great if anyone had an idea what the issue might be. If not a link to a manual that contained a system 1 main board schematic may also be of some help.
 
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Try the ARIII in the good cabinet to see if it's the audio board or the main board.

Already tried this. It's the main board. If anyone has a clue what on the main board effect sound I would definitely appreciated being pointed in the right direction.
 
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