keithley 2400 C power issue

[richcj10]

I have acquired this piece B/C it wasn't working. (nothing on the screen, no beep) I have found out that the AC in to DC (12v & 5v) is working but the 12V DC to AC to +-15, +-30, etc isn't.
I think the problem is at the front end of the transformer. does anyone have the schematic?

Thanks,

Rick

[MetraCollector]

As I know, schematics are not available, I was trying to find some for K2000 with no success.
Anyway, service manual is available through G. and there are some flow chart for repairing these Keithley instruments.
GL !

[free_electron]

Most likely that big power hybrid is shot. On the bottom board there is an industrial power converter brick. Either a vicor or an ericsson. They are hard to find...

[richcj10]

It works.
I get the 12v and 5v out of it.
I just discovered if I run my o-scope probe across one side of U3 (Main CPU)
it will reset and turn on with a "No Com" error.