Question about Peavey Xr 8600 8 Channel Powered Mixer

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I have the peavey 8600 and l was doing karaoke at my bar last nightwhen something weird happend. i plug my karaoke eqpment into the last channel at the rca in and last night that channel lost half its power for some reason. i changed channels and it worked fine. i moved it back and it done the same thing. WHATS WRONG my xr 8600 is less than a year old.

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Iis ALL your equipment powered from the same receptacle? It had better be... ground bounce can destroy input circuits in these units. I don't have the schematic but a common problem where XLR connectors go into a mixer is they have radio-frequency noise suppression caps to ground from each side of the XLR input. These caps are often lower voltage rating and can be popped by ground bounce or ungrounded equipment being connected before the ground connection is made. When one goes, there is loss of half the voltage or 6 Db of power gain. Since these RCA's are right at the XLR they MAY connect and have these caps and one may have shorted. That means the repair shop I am afraid unless you are adept at electronics. Most of these mixers are a pain to work on that area as all the knobs and screws have to come out/off to get the circuit board away from the panel to work on... I wish I had the service manual to give you more info...

PLEASE in the future power all equipment from the same receptacle or power source AND for units that don't have three wire power cord, NEVER change cables that can break the ground connection such as the RCA cables while power is on to any of the equipment. This will save repair bills...

This is from your friendly electrical engineer that works with this stuff and repairs his own...

Posted on Mar 19, 2011


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