Adcom GDA-700 not working


A couple weeks ago my Adcom GDA-700 stopped playing. The unit powers up and emits a "thump" from the speakers when I change the input but will not produce any input sound. I am wondering if anyone has had experience working with these units particular or if this is a problem which is common to DACs. Any help would be much appreciated.
jahmann
I own two GDA 700s and a 600 ..if you want another 700 let me know...probably be cheaper than fixing it...I only use one and have the other for back up in case it goes bad..Actually I think there are very few moving parts and should be easy to fix IF you can find somebody willing to work on it...give me a reply if you want mine
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