September 2011
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Things that make you go Hmmmm? Part IV

The case of the blown fuse, or rather the blown up fuse:

Blown 10 amp fuse on Harris SX5 PA board

Blown 10 amp fuse on Harris SX5 PA board

F32 is blown to small bits and had to be vacuumed out of the bottom of the transmitter.  The reason why is the pair of MOSFETS connected to that circuit were shorted.  Of course, the reason for the shorting MOSFETS needed to be investigated.  What I found was on the under side of the PA board where the brass stand off attacked to the torroid combiner board, the nuts attaching the stand off to the combiner board was loose and there was a big arc mark.

I tightened everything up and replaced the MOSFETS, marking them with a pen in case they short again, in which case the drive section needs to be closely examined.


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