[Icom] 761 Trouble shooting

Mon, 07 Apr 2003 08:37:12 -0600

Hi,
That idle current should be zero. Have to remove the final xsistor and 
measure it. One or both may be
leaking. If you find one bad, replace both to be sure.
GL es 73,
Tony, VE6CGX.

wjdiamond wrote:

>Hi Folks,
>
>
>Well, I have been doing some more testing on the ailing 761. Here is what I
>have found so far.
>
>The drive idle current is way out of spec. It was set at 500 mils and had
>about 40 watts output.  It will not adjust below 240 Mils and results in
>zero power out.
>
>With the idle current at 300 mils there is about 5 watts output. The power
>output adjust will not raise it above the 5 watts. It will take it to zero
>however. When the pot is turned back up there is NO power out at all until
>the TR switch is cycled and then it comes back.
>
>The 50/100 watt switch has NO effect at all.
>
>I am beginning to suspect the final output transistors are gone.
>
>There is no PO on AM at all...
>
>Anyone have any good ideas for me?  I sure wish it had 6146's in it Ha Ha.
>
>Thanks
>
>        William J. Diamond (Bill)
>        Rogers, Arkansas USA
>        [email protected]
>
>        Ham Radio Operator WR�T
>      Flying The Flag Long Before
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>
>
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>