20 Most Recent Onkyo TX-DS939 Receiver Questions & Answers

did you solve the problem ? i have the same thing

The manual explains it.

http://www.retrevo.com/support/Onkyo-TX-DS939-Receivers-manual/id/365ag201/t/2/

Yes.

There are several other methods for your surround sound channels to operate without your optical connection.

Sounds like you've blown the audio amplifier, you'll have to get it repaired by a service tech.

What you are getting is excessive phase shift at the lower-frequency edge of the audio pass band, causing oscillation. This is almost always due to aging capacitors or preamp
.Replacing preamp or capacitors will surely solve the problem.
Hi,

check the coupling capacitors for the speaker outputs. It probably has quasi-complimentary transistor configuration in the amp section. If they loose capacitance the circuit can become unstable.

check the leads on the square transistors.If they are bolted down the leads sometimes break where they are bent.

post a comment for further assistance.


thank you for using fixya have a nice day:-)

Im not saying that this will solve your issue since there is nothing listed anywhere on the manual or any website that help with this. But I had the same error code a few month back. I had 3 issues.
1. Speaker wires not connected fully. ( Even though it worked ok for over a year)

2. Power failure ( Had to replace the power supply)

3. Internal Control board failure. ( Had to replace the control board)

Now I do know that you can also contact the manufacture about this issue also. So that may be a step in the right direction. The last thing you can try is to unplug the unit for 15 minutes then plug it back in. Resets the system.

disconnect the speakers and see if it does the same thing.
if it does not shut down,check that the speaker wires are not touching on the back of the speakers.
many times,people run over the wires with a vacuum or similar and a short results,or bump the speaker.most people have the leads way too long,and even if one strand touches,it will shut down the amp.
if it still shutting off,there is an internal problem.
the best place to go with an onkyo is an authorized depot.
they are tricky to work on.
i did onkyo warranty for 7 years.

Hi...
If you've had it "fixed" 3 times and the problem comes back either you have the wrong impedance (ohms) speakers connected or the power supply in the unit is the actual problem.

Happy new years,

Scott

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