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Channel A on my PMP 1280s is blown

I plugged an monitor into Output A while in bridge mode. Found out after that was a big mistake. Ok so I checked the fuses and they all still worked. None were blown. One fuse for power, one for effects and the other two im not sure what they do but i tested them and they work. They could be to the fans inside however the fans are not working either. Not sure if they only kick on when overheating. Im starting to think now that a transistor or two may have been blown. Is this a possibility? Also how would i test the transistors when they are sottered to the board and there is no evidence that anyhing was blown. I only know there is something blown because there was a pop sound and electrical burn smell while performing and no sound comes out of Output A now. Also is there a link to schematics so i know which transistors and circuits are for only Output A? Thanks in advance!

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This website appears to have diagram for it. You will have to register to log in. http://elektrotanya.com/?q=hu/content/how-change-site-language-english
May of been some other component burnt out. Only way is by test meter and testing. Quite possible transistor burnt out.
You should be able to test it in circuit for Short circuits.
If output transistors faulty make sure you check driver transistors as well. Hope some of that helps.

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

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SOURCE: amp blows fuses

The fuses are there to protect the internals of the AMP.....
Please check that the correct fuses are installed......
if the incorrect ones are installed then a fire may develope...

There should be a manufacturers lable on the external chassis that details the fuses to use....

Fuses now days can be slow blow or fast blow....so the correct fuses must be used.....dont increase the fuse rating past the chassis panel label...but make sure they are correct...if they are correct then the amp needs a service to determine where the peak loadings to the power supply are originating from...

Some one may have installed incorrect fuses in the past...

Cheers from YUBEUT


Posted on Nov 03, 2007

  • 236 Answers

SOURCE: Samson Servo 170 protection circuit problem!

my friend resistors and diodes don't just go off your circuit without a real problem. those parts gave up because of shortage on your power section, i suggest that you check your power transistros first along with the diodes and resistors.

noisy transformers... hmmmm why is that making sound? the solution there is to dip the power transformer to a thick shellac varnish let it there for let's say an hour then let it dry for a day. then place it back in your unit and see if still sounds

Posted on Aug 13, 2008

  • 1 Answer

SOURCE: no output to speakers mackie 808s power mixer

I can hardly even tell what you're talking about because you don't use any punctuation.

Posted on Dec 17, 2009

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Hi, When an two channel (stereo) amplifier is connected in bridge mode the polarity of one channel is reversed, for this example say channel B. An identical (mono) signal is applied to both channel inputs.
The output is now connected between the two channel +ve outputs. As channel A's output goes +ve , channel B's output goes -ve, thus doubling the output voltage.
On this Behringer powered mixer, the bridge switch simply connects the power amp section inputs, the required way.
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So.... If you connect a speaker from the A output alone then I would expect it to work, BUT if there is already a speaker connected from the bridge output, then what happens will depend on the amplifier design.
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You have a lot of company in the something stupid department. We've all done that. Plugging a monitor into output A probably grounded the bridge and blew a fuse. Those tiny fuses with white covers are ceramic but they can be tested the same as regular glass fuses. You can open up your amplifier and check continuity across each one. In case of a hard short, you may see some evidence of discoloration around the blown fuse.

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That's a bad sign. A dead short in the output results in a short of the audio output transistors. I believe that to be the problem and a fairly simple fix to someone good at soldering BUT, you can't get parts for behringer equipment. Most components are specially made for behringer. I've been working on an amp for 6 months and I can fix it BUT, I can't find the parts anywhere, or can even find any reference to them online. Without a reference to the specs, I can't even get a generic replacement. Check your music stores in you area, a behringer dealer may can help you.

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Let me know if you need any more help,

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