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How can I eliminate audio Hum from Onkyo TR-SR705 AV Receiver?

I am trying to use a new Onkyo TR-SR705 AV receiver. When first setup, I noticed a low 60Hz hum without any of the inputs active, and a louder hum when the "phono" select is made on the receiver (even though the phono was turned off and is grounded to the receiver). The hums were the same from the front speakers and from headphones.

There are no video output connections. I am trying to solve the audio hum before completing the theatre setup.

After removing all inputs (including antennae), and all speaker wires, the hum on the headphones is the same. Moving the unit to another power circuit made no difference.

Can there be any conclusion other than that the receiver is defective?

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Is there any hum in Direct and Pure modes ?

If there is no hum in direct and pure modes .
Then it is bad processor board .

You need to contact ONKYO

Hope this helps .

Posted on Nov 10, 2008

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Hi the problem is with reciever only you should change its freqency signal or the problem may be with input connections itself

Posted on Nov 10, 2008

  • ABHISHEK.C
    ABHISHEK.C Nov 10, 2008

    or there may be short circuit

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There might be a grounded component inside the circuit board. Hopefully its just a wire that needs to be resoldered. Better check the internal of the unit for visible loose component or parts connection.

Posted on Nov 10, 2008

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