[ICOM] THANKS! Re: Icom 706 Dead on Tx and Rx (Again)

[Al Waschka]

Thanks to everyone for the service center recommendations.  I have contacted one and will check with the others to see what their backlogs are.

73,
Al




________________________________
 From: Jim Vohland <n9vo at hotmail.com>
To: ICOM Reflector <icom at mailman.qth.net> 
Sent: Monday, August 5, 2013 11:15 AM
Subject: Re: [ICOM] Icom 706 Dead on Tx and Rx (Again)
 

Another highly respected icom guru is Scott Malcolm.



Sent from my iPad

On Aug 5, 2013, at 11:09 AM, "Jim Miller" <JimMiller at STL-OnLine.Net> wrote:

> AL, I have used Matt Adrian KD8ZB several times at least for my ICOM repair
> guy for several ICOM radios HTs and my 706 as well.  I recommend him to our
> clubs here and I know several who have also used him.  His prices are
> reasonable and his fixes are just that, fixes.  
> 
> He is an authorized ICOM repair center and does excellent work.
> 
> Matt Adrian KD8ZB
> 1792 Nash Drive
> Sat Joseph, MI 49085
> 269-429-2334
> 
> 73, de Jim KG0KP
> 
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
> Behalf Of Al Waschka
> Sent: Thursday, August 01, 2013 5:55 PM
> To: ICOM Reflector
> Subject: [ICOM] Icom 706 Dead on Tx and Rx (Again)
> 
> Seveal months ago I posted on here about a problem with my IC-706 (Mk I). 
> After finding and replacing a damaged cap, the radio got well and stayed
> well for several months, but the problem has now returned.  The replaced cap
> is fine.
>  
> Symptoms are no transmit output and severely degraded (40 dB) receiver
> operation on HF.  Based on output Rx noise, the attenuator and preamp appear
> to be working fine.  I can hear the noise at three distinct levels depending
> on whether the preamp or attenuator are selected.  On strong injected
> signals, the relative levels of the three options appear correct.  VHF works
> fine.
>  
> I have instrumented the radio with test points and traced signals through to
> the main board.  It appears that the filter unit is working normally. 
> Signals injected on all HF bands pass through the filter unit and appear
> unattenuated at the input to the main board.  After the receive signal is
> routed to the main board from the filter unit, it passes through a high pass
> filter consisting of C3, C5, C7 and L4, L5.  The output of this filter does
> not look right.  Either some of the diode switching is malfunctioning or
> components in the filter have changed values.  Instead of the 3.9 MHz signal
> I'm injecting, the filter is passing only high order harmonics, and those at
> attenuated levels.
>  
> Has anyone seen anything like this, and if so, was a cure discovered?  I'll
> continued to troubleshoot, but I thought I'd poll the group to see if there
> might be a shortcut.
>  
> Thanks,
>  
> Al K5TAN
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom Users
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> 
> 
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html