Fw: [ICOM] Origional Icom 706 w/ Low power, Any suggestions ???

[D & M Pendergast]

Hello Eric,

I hope this is of help to you as I have the same rig that did the same
thing.  Mine was caused by relay #6 on the filter board not switching on
caused by a blown protection diode.  The diode is a surface mount 3 legged
type that I replaced with a small signal diode (I think).  The purpose of
the diode is to protect the switching IC or transistor the turns the relay
on or off when the relay de-energises.

>From memory, looking at the circuit diagram - relay 6 is switched on at all
HF bands but not on 50 Mhz which explains why the output power is unaffected
on this band.

This diode sits almost on the rear most edge of the PCB concerned, I just
cant remember if it is accessible through the top of the radio or the
bottom.

I hope this is of help to you as I made this repair on my rig and it
functions normally again.

All the best to you,

Des - VK3DMP.


----- Original Message ----- 
From: "Eric Wilson" <n4hgz at bellsouth.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Tuesday, October 04, 2005 12:15 PM
Subject: [ICOM] Origional Icom 706 w/ Low power, Any suggestions ???


> Hello,
>
> I have an origional Icom 706 that has the following symptoms,  It has
> low power on 10 through 160 meters.  On 6 meters the power output is
> full output and the power drops lower and lower as you go down in
> frequency.  On 10 meters I have around 40 watts and on 160 meters I only
> have about 3 or 4 watts.  I put the rig on my Astron RM 50 Amp supply
> and it draws about 10 watts on 10 through 160 meters.  Does anyone have
> any suggestions ?  I don't think it's the finals since I get acceptable
> power out on 6 meters.   I have not tested 2 meters as of yet.
>
> Thank you,
>
> Eric
> N4HGZ
>
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