Hello, 

I have got a Beolab Penta MKIII and a problem with the amplifier Beolab 150. I know that the problem is located at the platine behind the front clap. If I change this with the other box the concerning box works fine.

The error is that the display is not working and the midtones do not work. So, are there any wiring diagrams or measurement points where I can check this item?  Or does anyone have some hints how I can locate the problem?

Best Regards

Sven