Behringer EP2500 no output on CHANNEL 1

I have rebuild the push/pull power drivers on channel 1 of my ep2500. They were blown and tripping the cct breaker when a speaker was connected. All the power transistors and fets are now good. I can find no other defective discrete components (diodes, resistors,caps etc). The amp powers on fine both channels clip leds momontarily flash but CH1 still has no output. I am testing using a off pwr impedance curve signature tester and a multi meter. All the discreet components on the top and lower etch all look fine. When I switch off the channel 2 clip led slowly gets brighter over about 15-20 secs but chan 1 clip just blips once. Any ideas? Could it be the op amps on the lower etch??? Can I use a scope to check the op amps are working ok if so what component on the top etch do I clip on to. Regards, Eddie Grice UK

Leon Zupanec Jun 07, 2008

Shematic diagram for EP2500 Shematic diagram for EP2500

2 Answers

Scott Frye

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1,175 Answers

Yes,
Oski has the right idea.
Check op amp outputs for some version of the input signal.
Check the plus /minus supplies for the power transistors and see if they match the other channel.
See if the input signal is getting to the bases of the driver transistors

Posted on Feb 02, 2009

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113 Answers

Check all op amps for correct voltage swing +-should be equal,test output of op amps no voltage should be present, use chasis gnd as tester neg.check voltage regulation especially 12v or 15v +-.note some amps show unequal led indications when only 1 channel connected to a load.I will try to get some more info on this specific amp because i don't know this circuit well,keep in touch as you update though.

Posted on Aug 22, 2007

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