Audio System X70.4 Disorted output

[Achim1409]

I will try later. Come back then.. Thanks a lot Perry

 

[Achim1409]

So, the channel with the shorted fets is working, but with reduced output compared to the good one..
The other channel still disorted. It doesnt belong to the fets on this channel, because i changed for test ....

 

[Perry Babin]

Did you remove the 6-7 jumper?

 

[Achim1409]

Yes jumper is removed.

 

[Perry Babin]

How does the signal level on Cx50 compare between the good and bad channel?

 

[Achim1409]

You mean this potentiometer?

 

[Perry Babin]

No C150, C250, C350... Using the x is shorthand to mean all corresponding components.

 

[Achim1409]

Input at the cap is at each channel the same, see first picture.

The second and third picture are the disorted channel and the reduced output channels. The last two pictures are from the working channels.

 

[Achim1409]

Continued today.

Must be some Audio ground issue in the pre amp side.
If i inject a audio signal at C150, and connect the ground to the rca ground, the signal is lower and slighty disorted. If i connect directly to audio ground, the signal is clean.
That means, if i inject the signal directly into the NE5532, everything is fine..