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Denon pma-520 i've a problem with my amp it's that the right speakers output is lower than the left one in both speaker A and speakers B please tell me what to do i tried to change cables but no effect then finally i knew that there is a problem with the amp itself

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If you understand electronics then work backwards from the speaker outputs to the imputs. You need to make the channel buzz by touching the circuit, you can use a small screwdriver. Best of all is a signal injector, you can buy one at a electrical service shop (Maplin UK) they can be cheap for a very simple one.
Compare the results with the good channel. When the sound gets weak you have located the area in which the fault lies.
If not then off to the repair shop.

Posted on Jan 27, 2009

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hi.
Did you checked balanced impedance?load speaker impedance vs PA output?or PA might over driven,causing a trouble on the pre-amp to power amp circuits and components damage,
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I have a denon pma 500v amp, has distortion in right channel, both speaker output and headphones, what should i check for first?


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That model shouldnt be stuck in stand-by
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Hello,
Its usually not a fault that you will see unless somethings burnt up. This is solid state electronics and you don't see this stuff go bad. But in the meantime try disconnecting the speakers and see if it still goes into shutdown and at the same time have a dc multimeter attached to the speaker outputs. If the unit comes on and you don't see any DC at all or very very little B+ on both speaker terminal sets then you may have a defective speaker. If you do see dc then that's why the protections coming on so you don't blow out your speakers. If you don't have any equipment or don't have any electronics experience I would then take the unit to a repair person for an estimate. Good Luck

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