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[Yaesu] Yaesu FT980

To: yaesu@contesting.com
Subject: [Yaesu] Yaesu FT980
From: Dave Clift <daveclift@uniserve.com>
Date: Tue, 12 Sep 2006 21:39:45 -0700
List-post: <mailto:yaesu@contesting.com>
Hi All

I have a problem with one of my Yaesu FT980 CAT Tranceivers that perhaps 
some one has run into before and can help me out.

The problem started when I hooked in an amplifier without totally 
reading all of the instructions ( dumb of me) and found out later that 
the amplifier did not have a back pulse cancelling diode installed 
across the T/R relay. The amplifier worked fine at low power but when I 
increased the power the radio went dead so I suspect a surge went back 
through the radio.

I took the covers off the radio and found the 13.5 volt 3.6 amp fuse 
blown and replaced it but the radio is still dead. The main fuse is OK.

All of the meter lights light up, the frequency dial lights up but the 
dial is stuck on 40 metres however is adjustable within the 40 mtr. 
band. Also the cooling fan does come on momentarily when the power is 
turned on.

I investigated further and found that there is a 6 connector terminal on 
the protector unit board ( PS2419A) that upon checking the voltage on 
the different terminals found that teminal #6 is "0" voltage where it 
should be 13.5 Volts. If I am reading the schematic properly it appears 
as though that terminal powers the 10W P/A & 100W P/A.

I suspect the problem is in the Protector Unit however before ordering 
the part I would like to be sure of it.

Have any of you run into this problem and could help me out?

Thanks very much


Dave Clift

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