Problem with onkyo receiver (1 Viewer)

[HienD]

I have a problem with my onkyo tx-sr600 receiver. The Sound coming out of the receiver is distorted or clipping some of the time at all volumes. It happens at the same points on the dvd/cd. It mostly happens during louder vocals or midrange frequencies/sounds. The sound is not as clean anymore and seem like some static has been added to the sound. The same dvd/cds plays fine on my parents system and my $1500 car stereo system.

Here are the thing I tested or done.
-Tested on 2 different dvd players and my yamaha cd player.
-Disconnected everything from the receiver leaving only 2 speaker and the cd players connected. This is using both anolog and optical output to the receiver as well.
-Tested using different analog input as well and it does the same thing.
-Used different set of speaker with the same result.
-Test my speakers with my parents receiver and it's fine.
-Headphones even suffers from this problem.
-It's also distorted with the 3 surround speakers in all channel stereo mode.
-Have tried all the surround, dsp and direct modes with same results.
-Tried reseting speaker level and intellivolume to 0


Anybody here know what could be wrong. The receiver was sent out to the service depot and is gonna take 3-4 weeks. I just wanted to know what I should say when they find nothing wrong with it. There is diffinitely something wrong with it. Thanks

 

[Nick.H]

Could be that the receiver is not grounded correctly, that would cause it to clip when playing music.

Does it have a manual ground plug or point at the back? I've had a reciever that worked for about 5mins then became all distorted and clipped, this was grounding I had to actually get it repaired.

Hope this helps!

 

[HienD]

There no ground plug or point in the back. Only the sr700 and up has one. Could it still be a grounding issue? I have a good surge protector that tests the inlets for me and it registers fine. I only have 3 thing pluged it this surge, receiver, cd player and ps2. It just started doing this a few weeks ago.(I've had the receiver for 4 months now) So I wonder what it could be?