Studer A800 audio noise from PSU

[Pat Maki]

Update - Put in the 2N5884 but that didn't get me the +15V.....voltage took a slow nosedive to 0....so swapped the LM340KC and that brought the +15V back. Looks like problem solved. Found a couple brittle regulator wires

 

[Brian Roth]

For future reference...

Beware of all the Molexes hiding behind the audio cards. You have to "fold down" that entire front section to get to them (almost a 2-man job to do that because the assembly weighs a jillion pounds).

Yellow Frako(?) axial electrolytics on various audio cards. They tend to short.

Bri

 

[Walrus]

Yes, cleaning up those molexes is definitely a labour of love, as you have to remove all the cards then pull out all the rear connections before you can unscrew loads of screws to remove the motherboards.
All the while with the front section resting on your lap!
Yes, I have done it to a couple of machines!