[Yaesu] ft5200

[Tom Seawright]

I have a question for the list re the above dual band unit.  what 
controls the fan? I have lost high power on vhf side, and in trouble 
shooting the unit i have noticed the fan will run most of the time even 
when the pa isn't even warm.  finally got the low power side up to 5 - 6 
watts but the high power side will not go to 50 watts is same as low 
power.  cant find any broken traces in the pa brick.  any ideas, also 
the pin diode in series with the output side is, checks good.
thanks
Tom
WA5WQC