{Collins} 516 F2 problem

I have a problem with my 516 F2 power supply.
1. Connected to a 32S3, system works normal all is fine until suddenly, the 
4 amp fuse blows.
2. replace fuse all works fine until suddenly fuse goes again. Current is 
that blows fuse it much greater than the 4 amp rating, so the problem isn't 
just operating close to the 4 amp rating of the fuse.

I suspect a leaky filter cap, but I thought I'd ask.

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