[ICOM] Oh NO!!!!

Wed Apr 25 18:01:09 EDT 2012

Does the 756 original also suffer from these problems?  I have been thinking 
about getting one of those this summer when the summer teaching money comes 
in

John AF5CC

----- Original Message ----- 
From: "Phil Krichbaum" <vailphil at sopris.net>
To: <icom at mailman.qth.net>
Sent: Wednesday, April 25, 2012 9:31 PM
Subject: Re: [ICOM] Oh NO!!!!

>     It sure seems a rig in this price range should have a reasonable
> method of protection from ESD. Some of the old tube rigs had a neon
> bulb across the RX antenna terminal to ground to bleed off the ESD.
>     Phil N0KE
>
> On 4/25/2012 10:08 AM, Stephen Budensiek wrote:
>> Phil,
>>     I can't answer for the newer rigs.  But it is there in all flavors
>> of the 756, ie the original 756, the Pro, the Pro2, and the Pro3.
>> Someone commented it was also present in the 746 (I've never owned
>> one).  Also can't tell you about the newer rigs.  I find it
>> interesting as a engineering tech that it avoids the finals (should be
>> first thing in the chain from the antenna port on the tx side, and
>> goes to the drivers).  Not sure how that is done.
>>
>> 73's de Stephen, K0SD
>>
>> ***************************************
>>
>> On Wed, Apr 25, 2012 at 11:27 AM, Phil Krichbaum<vailphil at sopris.net> 
>> wrote:
>>>      I'm not sure if you mean 756 PRO, PRO II or PROIII. I know from
>>> first hand experience that the PRO II and PROIII suffer this problem
>>> too easily (IMHO) from ESD (electrostatic discharge). I had a new in
>>> the box PRO III and in the first hour after I took it out of the box
>>> during which I made two QRP QSOS and one at 100w, the TX power went to
>>> almost zero. At the time there was not one cloud in the sky, no wind
>>> etc. The failure was some FETs and diodes in the tuner and it was only
>>> after a few phone calls Icom agreed to cover the repair under
>>> warranty! My antennas have less than 2:1 SWR.
>>>      Another time I had a close lightening strike and my PROII was not
>>> connected to an antenna and was off. It was off as was the Icom PS it
>>> was connected to but it was plugged into the AC mains. The PROII was
>>> totaled but I still use the same PS years later and it had no
>>> problems. Several other items were damaged/destroyed (TV, answering
>>> machine, computer, well pump relay) and it seems the damage came in
>>> the neutral side of the AC 117 line. I've since had the power company
>>> install a "meter treaters" on my electric meters and I've had no
>>> further problems even after a direct hit on the over head feed to the
>>> house last summer but your results may vary. I'm not then lone ranger
>>> with this type of Icom 756 problems and have no clue if it has been
>>> taken care of with the newer Icom rigs.
>>>      Phil N0KE
>>>
>>>
>>>
>>>
>>> 4/19/2012 12:22 PM, bonddaleena at aol.com wrote:
>>>> Hi. I've been a reader of this site for quite some time. Last summer, I 
>>>> took a 'close by' lightning hit. Flash and noise at same instant. I 
>>>> went into the house and found a bunch of stuff damaged. I suspect it 
>>>> hit a nearby AC line due to the following:
>>>> It took out both of my rotor control boxes, Astron 50 Amp supply, TV, 
>>>> my 70 cm preamp, on a different tower, etc.
>>>> I checked my favorite radio, my 756PRO, that I hand carried back from 
>>>> Tokyo when they first came out. It is connected to a PS-55 which is 
>>>> plugged into a large surge protector. Seemed OK.
>>>> Yesterday, I went to call someone on 6M and noticed NO output. The 
>>>> receiver is fine.
>>>>
>>>> ALL antennas were disconnected as usual, when not in use and the coax 
>>>> pigtails were grounded. (I use hardline for most of my antennas}
>>>>
>>>> - no output on any band
>>>> - ant OK
>>>> - tried dummy load
>>>> - used several different wattmeters
>>>> - 'scope shows normal voice patterns
>>>> - Po, SWR, etc non functional
>>>> - tried master reset. no good.
>>>>
>>>> So, before I take a peak inside, any suggestions? I'd like to fix it 
>>>> myself, if possible.
>>>>
>>>> This is strange because my mint 745 next to it did the same thing a few 
>>>> years ago. I haven't bothered to even look at the 745 because the 
>>>> receiver is also fine. I use it with receiving converters.
>>>>
>>>> Thank you!!!
>>>>
>>>> ron
>>>> N4UE
>>>> ----
>>>> 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
>>>>
>>>>
>>>> -----
>>>> No virus found in this message.
>>>> Checked by AVG - www.avg.com
>>>> Version: 2012.0.2126 / Virus Database: 2411/4947 - Release Date: 
>>>> 04/19/12
>>>>
>>>>
>>> ----
>>> 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
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2012.0.2126 / Virus Database: 2411/4958 - Release Date: 04/25/12
>>
>>
>>
> ----
> 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 