Question about Onkyo TX-DS939 Receiver

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ONKYO TX-DS939 (sound and heat/fan issues)

Greetings FixYa,

First off, I own an ONKYO TX-DS939 Receiver. The first thing I noticed that was happening was it would get hot, VERY hot and the fan wasn't coming on for some reason unless I had the volume turned up FULL BLAST. As a result from it getting so hot if I would turn it off then BACK ON (right away) there would be no sound coming from the speakers besides a LOUD POPPING and CRACKLING sound. (like my speakers were blown or I was getting some feedback)

I want to stress the fact that my speakers are in MINT shape and have been tested on another system so it is NOT them. Currently my receiver will turn on and all the displays work and video feeds but if I turn on the volume at all its nothing but SNAPPLE, CRACK, POP!!!! Also, the fan doesn't work properly. It seems to me like it could be a power thing but who knows. Any help would be GREATLY appreciated as I paid a boat load of money for this back in "98.

Thank you.

Mike

Any help with this would be greatly appreciated.

Thank you.

Mike

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This sounds like the amp is seeing too small an impedence load. In other words, the amp is expecting to see an 8ohm load and is being presented a 4 or 2 ohm load. This will force the amp to work really hard and generate excessive heat. Does the amp generate sound at all? ever? If not, then you probable have a situation with high frequency oscuillations that you can not hear. This means that the amp is sending out a lot of power to the speakers that the crossovers are shunting to ground. Without seeing the output of the amp with a scope, I can not confirm this. This is not a problem that will be solved remotely. Bring the unit to a shop and request that the output be examined using a scope to check the waveforms. I suspect that a bad feedback look internally is causing the generation of the high frequency signals.

Keep us posted.

Dan

Posted on Oct 29, 2008

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