[Yaesu] Intermintent FT-5100 UHF PA

[doc]

If you find a decent schematic I'd be interested in a copy as well.

The one at http://krasnodar.online.ru/hamradio/sch_eng.html
wants to print out a few hundred pages!

My 5100 has very low deviation, but it is an intermittent and does
not appear to be the mic.

73, doc KD4E 


> Hi all.
> 
> My FT-5100's UHF PA has been acting strange of late.  The power output
> is intermintent going from full power in either high or low setting to
> about 250mW on the next transmission.  Since it will do 30+ Watts out,
> I'm assuming the PA module is in good working order.  So, I'm suspecting
> the problem may be in the control pots of VRs 1001, 1002, and 1003 as
> they may be dirty.
> 
> I would most appreciate help from anyone who has a service manual who
> is willing to  help me troubleshoot this thing a little closer and 
> provide the realignment procedure for the PA.
> 
> Thanks!
> 
> 73, de Nate >>