Hi Tom,
My experience with the Ft-920 is losing driver transistors when the power
drops to 30-40 watts. If it is getting real hot you have a shorted MFF255 or
the drivers which I think are a 2sc3133. Check on the base of each
transistor and see what the voltages are in tx and rx. In rx the base should
not have any voltage and in tx it should have around .7 volts. You may want
to look real close at the resistors in the final unit and this may point to
which transistors are bad also.
TNX... Tim wd0fkc
www.midwest-technical.com
----- Original Message -----
From: "DL7PP" <DL7PP@HFDX.DE>
To: <yaesu@contesting.com>
Sent: Tuesday, September 19, 2006 12:50 AM
Subject: [Yaesu] FT920 half Power
> Since yesterday my FT920 produces only abt 30-40Watts out.
> The Chassis ( on the amp side )gets very warm without transmitting.
> Is one of the amp transistors MRF255 damaged?
>
> With best regards
> Tom
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>
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