EU Radio Head Unit (EUDM 1991) - Repair

[Kaz-kzukNA1]

Thank you for sharing the info, Heineken. Much appreciated.

So, another one with ZD807 area. I had that years ago.

CUrrently, dealing with one unit with issue somewhere at the middle circuit board.

These days, the audio head unit repair is getting much more challenging ever so your knowledge database is precious.
Once again, thank you.

Kaz

[Heineken]

You're welcome Kaz, just trying to share what I've discovered.

Due to the angle the radio is installed and the location of the capacitors, the ZD807 area is affected by damage quite often.
I was surprised by the fact that so many OP amps are supplied with the 10 V reference created there. Even the volume and tone PCB are provided with V+ from there.

Another radio has very strange sound issues probably related to the audio path, too but I haven't been able to identify the problem yet.

It's good to hear the information provided is helping.