HP9915B with PSU problems

[Vassilis Prevelakis]

Hi,

I have returned to my HP9915B that blows its fuse as soon as you
power it up.

I followed Tony's advice and checked the two large capacitors (C46
and C58), and the PIC645 and they are all OK. I then checked the
U30 (3524) in the chopper sense circuit and its OK as well.

I checked the parts after removing them from the PCB to ensure that
there was no interference by other components.

So now I am really at a loss and wonder if anybody has any ideas.

Best Regards

**vp