[ICOM] IC 756 ProIII Tx problem
KK2DOG in NY
kk2dog at hotmail.com
Fri Nov 28 18:08:56 EST 2014
Ask this cat: http://www.n1eq.com/
Nothin' but 5's here: http://www.eham.net/reviews/detail/5640
Mike KK2DOG
> To: icom at mailman.qth.net
> Date: Fri, 28 Nov 2014 13:48:26 -0500
> Subject: Re: [ICOM] IC 756 ProIII Tx problem
> From: icom at mailman.qth.net
>
> 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
> >>
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
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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
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