[ICOM] Re: IC746 746 Pro no output

[Jim Vohland]

I am betting that this is not the IC151 failure but will be a transitor on the PA board. This is the most recent problem popping up. I have a friend who purchased a new 746 pro for Christmas last year. In the eight months of ownership, he experienced the same identical failure not once, not twice, not thrice but FOUR times. Icom bought it back and gave him a full refund. Check with Icom, they may fix it for you. Then I would sell immediately. 


> From: k7acz at cox.net
> To: IC746 at yahoogroups.com
> Date: Sat, 30 Aug 2008 15:52:51 -0700
> CC: icom at mailman.qth.net
> Subject: [ICOM] Re: IC746 746 Pro no output
>
> I kept the attached emails in case the problem ever happened to me.
> Today it did.
>
> On 8/30/2004 I purchased an Icom IC-746PRO S/N 02028XX from HRO. I
> promptly registered it with the Icom Warranty web site.
>
> This series of serial numbers supposedly had the
> IC-151 power output problem corrected. However, today I have
> experienced a problem that I believe is the IC-151. The receiver works
> fine. On RTTY with the TRANSMIT button depressed I get no power out on
> the Transceivers' LED screen. My dummy load shows maybe a watt or 2.
> The linear amp switching relay is OK as with my AL-80B turned on the rig
> will key the amp and the amp's meter shows maybe one watt of power.
> This problem started between QSO's. I had just worked a 5B station in
> the YO Contest with no problem. I saw a YO station spotted and QSY'd
> down the band to work him. I keyed the mic as always and there were no
> voice peaks. I then tried transmitting on CW and RTTY and there was no
> power out. There were no power surges, lighting strikes, etc.
>
> I have an older IC-746 non pro as a back up rig. All the connections
> for the PRO and non PRO are the same. If I connect the non PRO using
> all the same coax, power supply, etc, connections as the PRO the older
> rig works fine. Since the older non-PRO works fine but the newer PRO
> does not that tells me my power supply and coax connections must be OK.
> I took the covers off and did not find any burned parts or other
> problems. Does any one have a trouble shooting guide for this problem?
>
> Since it was purchased in 2004 it is well out of warranty unless Icom
> has extended the warranty for IC-151 problems. The web site Bill
> referenced is now down. Guess Icom was getting too much grief over this
> problem and shut it down.
>
> TIA for any suggestions you may have.
>
>
>
> _______________________________________________________
> Alan Zack
> Amateur Radio Station K7ACZ
> Official USCG Auxiliary Comm Station
> Las Vegas, Nevada, USA
> Aviation Chief Warrant Officer, U.S. Coast Guard, Retired
>
>
> ----- Original Message -----
> From: "Bill McLaughlin" 
> To: 
> Sent: Sunday, February 25, 2007 8:57 PM
> Subject: Re: IC746 746 Pro no output
>
>
> Dave has it correct,
>
>
> Reference this if they give you grief about the repair:
>
> "http://www.icomamerica.com/products/amateur/746pro/ic746prodiodefix.a
> sp"
>
> It is a known "issue"
>
> Bill N9DSJ
>
> --- In IC746 at yahoogroups.com, Dave NØRQ  wrote:
>>
>> I agree with the other comments.
>> 027XX is definitely old enough to be subject to the so-called "ESD"
> problem. When it hits, power output drops to essentially zero on all
> bands and all modes.
>>
>> My advice would be to send it to Icom directly, ask them to fix it
> at no charge since they admit on their own web site that it is a
> known problem. I suspect they will do that for you. You shouldn't
> have to pay to fix a real defect.
>>
>> Any of you other guys will older serial #s (746PRO only) should
> send your rig to Icom to get the "ESD diode mod" (?) done, which
> should help avoid this problem. Further details can be found by
> searching the archives. All it will cost you is shipping to
> Washington.
>>
>> --
>> Dave N0RQ
>> http://www.powerlinenoise.com
>
>
>
>
>
>
> ----
> 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/

_________________________________________________________________
Talk to your Yahoo! Friends via Windows Live Messenger.  Find out how.
http://www.windowslive.com/explore/messenger?ocid=TXT_TAGLM_WL_messenger_yahoo_082008