Digidesign 192 AD card Noise

[rrs]

Just wanting some advice on how to track down what components may be causing excessive noise on 3 channels of my Digidesign 192 AD card.
Any suggestions would be most helpful.

 

[Greg Norman]

I have fixed this with replacing a couple of surface mount transistors, and one of the op amps in the past.  I used an oscilloscope probe connected to a battery powered guitar amp to trace where the noise was coming from.  I can't recall where it was in the circuit (years ago).  The lesson I learned was that it cost me more, in my time, to repair the problem, than to get it fixed/replaced by DD/Avid.  Typically they turn around the A/D board for a couple hundred bucks, and the whole board is brought back to spec (repairing/upgrading any other issues).