Question about Behringer EUROPOWER EP2500 Amplifier

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Behringer PMH 880S Hi; Can anyone help. I am desperatley looking for the schematic circuit diagram for the switching power supply Behringer Model SPS1000/02 which is fitted to the PMH 880S, and also the replacement part number for T1, T2 which appear to be the driver transistors for the 1MBK50D's switcing mos fets.The transistos have a stock part number of C2655 and A1020 which I asume showing one is a PNP and the other an NPN.any help would be greatly appriciated.

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Oh yes... I have repaired several of these supplies.
For the IGBT's use APT28GA60BD15 which are pricey at $9.28 from Digikey.com (still lower than alternative sources. Getting the heatsinks off, one of which has a thermal sensor as well is a real pain! Transformers don't fail...
The C2655's are really 2SC2655-Y and those I get from Allied. The mating 2SA1020-Y I believe is available either at Digikey.com or Mouser.com.
You will LIKELY find the IR2153 chip is blown and that I had to get from Allied. Usually one of the PL4148 surface mount gate drive speed up diodes is blown either short or open (D24 and D25).
Often transistor T9 is gonzo (BC856MTTCT).
Often the 10 or 22 ohm wirewound charging resistors are blown open. I use TWW10J20RE as replacemens for those. Be sure and use silicone to help support them.
Now when you are done with that, you need to find WHY the supply failed. It is either because a ceramic cap across the 85 volts failed OR one of the power amps arced out. If the unit has the HCA2400 amp in it I will tell you what happens: In the vicinity of the SPF9640 MOSFET and a big surface mounted cap will be an arc between layers of the multi-layer circuit board. This shorts and fries the IRFP250 MOSFET and BOTH SFP9640 MOSFETS. The repair of this is major involving carving out the "cancer" and reinsulating with epoxy and replacing blown carved out traces with hookup wire. The proceedure I can't document here, but failure to correct this will result in power supply failing again.
FOR YOUR SAFETY ONLY work on the supply using an isolation transformer. Use a 150 Watt lamp in series for testing to act as a fuse so you don't pop the supply again. DISCHARGE the 85 volt outputs BEFORE plugging the amps back on the power supply.

Posted on Jun 09, 2010

Testimonial: "excellent response, covers the question and likely cause of power supply failure together with helpful hints on how to repair and where to get replacement parts without breaking the bank. many thanks fredy2"

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Hi. can any1 tell me if i can purchase or download an operators manual 4 the behringer pmh880s.thanks

Posted on Sep 05, 2010

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