[ICOM] IC 756 ProIII Tx problem

[Larry Young]

For those interested in the recommendations for home equipment protection, there is an IEEE publication that is available for download here: http://www.lightningsafety.com/nlsi_lhm/IEEE_Guide.pdf   While a lengthy read, it is worthwhile, and you can get a good idea of why some have problems with lightning and ESD issues.

Larry K4LXV



On Friday, November 28, 2014 2:05 AM, Phil Krichbaum <vailphil at sopris.net> wrote:
 


It made no difference on mine, no TX power on any band in my case and 
rig new was fresh out of the box an hour earlier. In the course of the 
first hour on the air I made two QRP QSOs and one at 100w into and 
antenna with very low SWR and suddenly no power out! WX was winter but 
clear, no blowing snow or dust.  Then I had to fight Icom for them to 
cover the repair as they said I operated it out of warranty conditions 
which I never could understand? I'd previously had a 756PROII for 
several years so it wasn't like I was unfamiliar with the rig?
    Lightening took that one out coming in the neutral side of the AC 
line. Rig was off and connected to the Icom PS that came with the rig 
and  was off but plugged in the outlet. PROII was not connected to an 
antenna. PS still works and nothing was wrong with it? I also lost a TV 
set, wireless router, computer HD, phone answering machine (came in 
phone line). Insurance companies do not like to cover lightening damage 
unless they can see singed marks on the equipment  or house which you do 
not usually see if it comes in the power lines or phone lines. The TV 
set was an older one and Hartford wanted me to have a TV repair shop say 
it was lightening damage and I pay for the TV shop! There are only two 
TV repair shops within 75 miles and they only service expensive home 
entertainment centers not a TV you can replace at WalMart for $150-200. 
I do not think anyone fixes those?
    73 Phil N0KE

D C _Mac_ Macdonald wrote:
> Wouldn't a way to check THAT problem be to run the rig WITHOUT using the tuner?
>  
> * * * * * * * * * * * 
> * 73 - Mac, K2GKK/5 * 
> * (Since 30 Nov 53) * 
> * k2gkk hotmail com * 
> * Oklahoma City, OK * 
> * USAF & FAA (Ret.) * 
> * * * * * * * * * * * 
>  
>
>  
>> Date: Thu, 27 Nov 2014 15:51:36 -0500
>> From: cwdx.hk1n at gmail.com
>> To: icom at mailman.qth.net
>> Subject: Re: [ICOM] IC 756 ProIII Tx problem
>>
>> Hi Phil, thank you for your advice. I was out of home, sorry for the delay
>> in answering. I'll check those FETs as you suggest.
>>
>>
>>
>> On Wed, Nov 19, 2014 at 10:03 AM, Phil Krichbaum <vailphil at sopris.net>
>> wrote:
>>
>>    
>>> I've seen this happen to all bands and it is some FETS in the antenna
>>> tuner that get blown by ESD. Blowing dust is enough to blow these FETs on
>>> these Icoms. Never leave ant hooked to one of these rigs in a storm of any
>>> type and there is very poor protection of the RX.
>>>    Been there done that and paid the repair bill too!
>>>    Phil N0KE
>>>
>>> Jaime Gomez wrote:
>>>
>>>      
>>>> I have an 756 ProIII that suddenly stopped transmitting on 1.8 to 14 MHz.
>>>> On 18 to 28 MHz I have good Tx power, very low or nothing on 1.8 to 14.
>>>> Any idea where shall I look? The filter control voltages are ok.
>>>> -- 
>>>>        
>> 73,
>> Jim, HK1N
>>
>> President DXARC - DX Colombia Amateur Radio Club
>> *Malpe**lo Isl. HK0TU 1990 & H**K0NA 2012 Team Member/ hk0na.com
>> <http://hk0na.com/> *
>> Araucaria DX Group
>>    
>                            
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----
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