[Yaesu] FT990 fan

john lee kt6e at yahoo.com
Mon Apr 10 16:38:12 EDT 2006

I recently picked up an FT990 which seems to have a permanently closed  (always on) cooling fan circuit. The fan also seems quite noisey. I  need to trouble-shoot the thermistor, op-amp and transistor in the  cooling circuit on the PA board. Also consider replacing the noisey  fan. Any info/advice would be appreciated.
  Tnx,  --  John
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