Question about Behringer Pmp3000 16 Channel Audio Mixer
Yep! The power amp for that side has failed. There is a weakness of insulation in the multilayer board of some of these that causes the problem. If you haven't seen smoke, that is good. Depending on the revision level of the amp module, there will be two or three blown transistors and a Zener diode blown and possible arcing within layers of the board. The repair of the module takes great care and skill due to the arc damage which is internal on the multilayer board. The amp module is a HCA2400 and are rare costing about $160 and probably are out of stock at FullCompass.com which is the Behringer parts distributor... I have waited 3 months for simple parts... I had one HCA2400 shipped to me but they had wrapped it so tight in bubble wrap that capacitors were peeled off the board and it had to be returned. They didn't know when they would get more... If you have seen smoke, then two other small transistors and a metering resistor have blown. Worst case is when the power supply gets wiped out as well... that ups the parts ante to about $50 as two expensive IGBT's also fail and a half dozen other parts as well.
I have repaired three of the HCA2400 modules and it takes many hours with dental drill to carve out the burned cancer and then re-insulate and put jumpers where the circuit traces used to be. It is NOT DIY for sure. Replacing the transistors requires a desoldering station. I have one unit that a hacker tried using solder wick and destroyed the board.
Posted on Mar 21, 2011
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Posted on Jan 02, 2017
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