Hi,

I have an old 0-100V (0.2A) HP power supply (HP 6116A), which is
broken. The output is always 0.6V (when on). Nothing is obviously
burned or exploded inside.

The problem started when one of the people in my lab connected a
capacitor backwards across the supply's output, giving it a large
negative voltage spike.

Any ideas on what could be the problem? The supply has a transformer
and several largeish capacitors. However, the inner circuit is pretty
complicated. My guess is something near the output is broken, but what
could it be?

Any advice would be greatly appreciated.