Question about Harman Kardon AVR 510 Receiver

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Hum on all outputs even with volume turned down. any ideas?

I have also experienced sudden and abrupt volume changes depending on what option I select, ie dolby vs stereo it seems as though the volume gets reduced to the point that I have to turn it way up to hear and if I change it back it is extremely loud, this happens when I switch from HD on TV to regular channels, it is not my cable box, must have something to do with reciever

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Signal problem on box

Posted on Jun 18, 2009

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If you have some idea about the working of your TV, and some service experience you can do it by yourself. Your TV has electronic volume controls. That means, a gradual voltage rise or lower does the volume to go up or down. This voltage variation is done by an Ic which we call it as "System Control Ic", that every modern TV has; but differ in their type and number. You must know how to follow the schematic diagram of your tv to get the exact point from which the voltage orginates, and which point regulates the same.
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1 Answer

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