[ICOM] IC 756 ProIII Tx problem
Ron via Icom
icom at mailman.qth.net
Fri Nov 28 13:48:26 EST 2014
Hi Phil. Reading your post brought back a LOT of memories (all bad)!!
Living close to the lightning capital of the USA, I ALWAYS keep my antennas disconnected. The lead in cables are connected to a well grounded buss.
I do have 3 towers, 2 are 100' + tall. 2 years ago my buddy and I were outside watching a nasty looking storm approaching. We saw AND heard the strike instantly. I went in and luckily found no fires.
However, my Astron was dead, 2 antenna rotor boxes, every tv and vcr/dvd player in the house. First thing I checked was my favorite radio, a 756PRO I hand carried back from Tokyo when they were first announced. It appeared OK.
Several months later I was getting ready to work some MS on 6M and found NO output. Also my IC745 was also acting the same.
I was afraid it was the IC151 problem. Although by now, I had fixed everything else in the house, this was the last straw. I contacted John, KI4NB here in Florida and he said 'bring her in'. I dropped it and my 745 off at the same time. He deserves all the "5" reviews he receives on eHam! Excellent!!!.
The PRO was connected to a PS-55. The 745 was connected to the Astron. Both PS were connected to (what I thought) were good surge protectors.
The problem in both was a diode. It 'appears' the PRO took the spike in through one of the ACC connectors in the back of the radio that was connected to a foot switch. That was strange.
It was also diagnosed as coming in my Neutral line, the strike hit the AC line a short distance from my house. I'm the last house on this particular power leg. I have a buddy who works for one of the local utility companies and said they always have trouble with neutral legs.......
I kept the IC151 and other spares for the 'next time'....sigh......
BTW, I am very skilled, now, at repairing mast mounted preamps. I keep spares for each VHF / UHF band! Got it down to a science. ha ha
ron
N4UE
-----Original Message-----
From: Phil Krichbaum <vailphil at sopris.net>
To: ICOM Reflector <icom at mailman.qth.net>
Sent: Fri, Nov 28, 2014 2:05 am
Subject: Re: [ICOM] IC 756 ProIII Tx problem
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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