[ICOM] Original 706 no HF output

[D & M Pendergast]

Hello again,

Further to my earlier posting I discovered that RL 6 in the filter board was
not switching on.  Cause - blown protection diode.
Removed the diode and now full power has restored with no damage to the
driver transistor.  A circuit diagram would have helped but managed without
it.  Hard bit now is fitting the replacement one!

Regards to all,

Des.

----- Original Message -----
From: "D & M Pendergast" <d_and_mpendergast at bigpond.com>
To: "Icom reflector" <icom at mailman.qth.net>
Sent: Monday, January 17, 2005 4:31 PM
Subject: [ICOM] Original 706 no HF output


> Hello to all,
>
> I have been asking some questions about the original 706 lately and now I
> have another one.  I wonder if someone can help or has seen this problem
> before.
>
> My 706 that I have had now for a few years has suddenly stopped full
> transmit output on HF.  6 metres is still OK and most of the bands show
> between 20 to 40 watts on 100 watt modes.
>
> 40 metres show virtually no output at all.
>
> Even though there is no output, current draw is extremely high to the
point
> of stalling a 25 amp power supply.  So there is something gone wrong and I
> ask for help if anyone who has experience with this model can give me a
few
> clues of where to look.
>
> My initial thoughts are something wrong in the final bandpass switching
> somewhere.
>
> Pleased to hear any replies,
>
> Des - VK3DMP.
>
>
>
>
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