Well having an idea isn't quite the same as troubleshooting, however, I'd start at the power cord and work inward. If C1 shorted that would be a problem, but it wouldn't blow the fuse. The only thing that might blow a fuse on the primary side of the transformer is if the little glow lamp shorted, which I think is unlikely, or the transformer windings themselves shorted. Unlikely, but not impossible.
After that there's nothing left but the generator board, or a short in the transformer secondary (again, not most likely, but it does happen.) Continuing onto the board, either or the filter caps C2 & C4 shorted would do it. As would bypass caps C3 & C5. A shorted diode or diodes in the bridge would also cause a blown fuse. I'd put my money on one of the 1000uF filters if the problem is here. I've gone on about why because some here know that I poo-poo the idea of changing these just because there's some unrelated problem. This time the might be the problem. Beyond the power circuit there are many components on the board that could cause the problem. I'd say buy a box of fuses, replace the 1000uF filters and try again. Good luck.
Nothing is ever as bad or as good as it first seems.