Question about Onkyo TX-SV646 Receiver

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Channels missing on Onkyo TX-SV646

I have an older late 90's Onkyo TX-SV646. I have lost all surround channels except for the right main. Is there an easy fix to this without tossing it on a busy highway. Yes it is a bit dated, but since we just moved into a new house, I don't want to afford a new 7.1 THX at this time. Mainly I don't want to start that discussion with my wife, cause her solution is to dust off her off brand college stereo receiver and use that. Which to me is UNACCEPTABLE, it has poor sound quality.

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These units are quality units. The fix is not the easiest. We need to determine whether the problem is the output amp sections or the processing side. Worse case, the cost would be around $50-$75 for parts plus the local labor rate. Given your description, it will be difficult to diagnose remotely. One alternative is to get a detailed repair estimate ($50 or so) and post the results here. We can walk you through the actual repair.

Dan

Posted on Sep 12, 2008

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Where is the aux/tv button on the onkyo tx-sv646?


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Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Onkyo-TX-SR701-Receivers-manual/id/365ag222/t/2/

7.1 would have Surround Back L and R.

6.1 would have just one back there (SB). It defaults to the Left output on the Pre-Outs if you ever go that route.

This being a 6.1 receiver it does not support two SB channels BUT you can configure those amp channels for a separate Zone supporting 2 speakers. Confused?

The manual shows a single SB speaker connected to the left side on Page 27. THAT would be consistent with a 6.1 configuration.

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Have you check the button Tape 2/ Monitor not have bin set to on? If you press this botton all sound is gone no mather what other button you are pressing.

Regards
Peter

May 04, 2009 | Onkyo TX-SV646 Receiver

1 Answer

No sound from Left and Right front speakers


You didn't state it but I assume the other channels are functional?
The auxilliary channels are generally lower power and may even be serviced by a different voltage than the main amps. If it is so designed, you may have something as simple as a blown fuse for the main amp supply.
If the aux. channels are equal in power, the power supply may still be dividing the load so a fuse still could be at fault. The unit could also use integrated power amplifiers in which case, if two channels are operating from a single module it could be a module failure.
I don't see much chance of anyone repairing this system without examining it in the first person. 

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solutiondoct

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