[ICOM] IC-706MKIIG Transmit Problem

[Alex]

>I have the same problem---If I unkey the mike and key it up  
>again---everything is fine--then a few minutes later the problem creeps back.  This happens to 
>me on all bands ;-(
>I have been reluctant to send it out for service because it's an  
>intermittent. I'm hoping the thing just stops working ! At least then a tech can  find 
>the problem.  

Does the 706 use a power module as a driver or in the final stage(s)? 

I've been chasing a similar problem in an IC-275H that I recently purchased and posted on here about. I'm fairly confident that in my case it is the power module that has developed a crack in the substrate due to excessive heat. I wonder if it could be a similar problem with your 706.

Cooking the radio into a dummy load in order to make it fail permanently may not  work because the power will be reduced because of the power failure when the problem occurs. So less heat is being developed and the radio may stay in that state for the duration of the transmission. If you cycle it enough it will eventually break permanently of course, but the problem is that it may take very many cycles as the material (beryllium oxide) is resistant to temperature changes. (it's also very toxic I learned).

73,
--Alex KR1ST
http://www.kr1st.com