Originally Posted by Theresa
I had a similar problem with one of my Emo amps and it was due to a faulty RCA jack. It was shorting out intermittently and for a long time I thought it was the miniDSP between the pre-pro and amp. I stopped using that channel as I had an extra amp sitting around and the problem went away. If it continues to malfunction after trying a different wire to the speaker I would ship the amp back to Emo although I know how hard this is to do.
Same problem here. Some time ago I bought an used one year UPA-5. After some time, the RCA jack of the FR channel got loosen and started to shut down (into protection mode) I just paid $35.00 to be soldering again, problem solved.
Right now, the RCA jack of the Center channel is also loosen, but is ok, no problem with any shut down (yet).
A friend of mine also bought a brand new Anthem MRX 300 Receiver and it had the same fault. It sent it back, it was repaired and once again, had the same fault. He was told the board (back) was a generic one, made in China and it seems it a was common control quality problem.
So, if that is true, , all the companies doing business with Chinese partners must be very cautious and take more quality control measurures (supervising) of their final production units.