[ICOM] RE: ICOM 746PRO Screen Brightness from K3JK

John A. Klokis klokis at verizon.net
Tue Nov 18 05:14:00 EST 2008 

thank you Ed for relating that information about the screen brightness.
John K3JK


----- Original Message ----- 
From: "Ed Myers" <emyers2 at cox.net>
To: <icom at mailman.qth.net>
Sent: Tuesday, November 18, 2008 12:38 AM
Subject: [ICOM] RE: ICOM 746PRO Screen Brightness from K3JK


> My 746 PRO has been repaired by an ICOM service facility after a display
> illumination failure.
> I was instructed to run the display at full brightness to preclude another
> failure.
>
> Ed WC4TT
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of icom-request at mailman.qth.net
> Sent: Monday, November 17, 2008 6:14 PM
> To: icom at mailman.qth.net
> Subject: Icom Digest, Vol 5, Issue 304
>
> Send Icom mailing list submissions to
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> Today's Topics:
>
>   1. WTB: Icom IC-970(x)  (Dr M J DiGirolamo)
>   2. Re: IC-765 (bonddaleena at aol.com)
>   3. IC-765 transmit audio problem (Jack/W6NF)
>   4. RE: IC-765 transmit audio problem (Mike Olbrisch)
>   5. Re: IC-765 transmit audio problem (Dave K6DLW)
>   6. Re: IC-765 transmit audio problem (Jack/W6NF)
>   7. Re: IC-765 transmit audio problem (Jack/W6NF)
>   8. Re: IC-765 transmit audio problem (Dave K6DLW)
>   9. from K3JK (John Klokis)
>  10. RE: from K3JK (harrytheham at verizon.net)
>  11. Re: from K3JK (John Klokis)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 14 Nov 2008 19:52:02 -0500
> From: "Dr M J DiGirolamo" <DrD at 2020.com>
> Subject: [ICOM] WTB: Icom IC-970(x)
> To: <icom at mailman.qth.net>
> Message-ID: <00cb01c946bc$5fcd3610$1f67a230$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> In search of Icom IC-970 (any model), modules, accessories, etc.
>
> What have you?
>
> 73,
>
> Mike DiGirolamo, W4XN
> W4XN at arrl.net
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 15 Nov 2008 17:06:16 -0500
> From: bonddaleena at aol.com
> Subject: Re: [ICOM] IC-765
> To: icom at mailman.qth.net
> Message-ID: <8CB158583DC18F8-A00-DF7 at webmail-dx08.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> Hi Mike, One last thing, my 761 was SO touchy, that just the LIGHTEST
> tap on the top cover would make it go deaf. Another tap and it would
> wake up. I hauled her out to the shop several times and every time, I
> 'thought' I had the problem 'fixed' when I found loose screws. It would
> work for a day or 2 and then the same thing would happen.
> Since I cleaned the relay, the radio has worked perfectly for several
> weeks.
> The relay in question is Icom P/N 6330000490, on the relay is P/N
> LY2-0-DC12V. In the 761 the Service Manual calls it RL13. However, in a
> small note, it tells you to add '500' to the P/N in the Tuner unit, so
> it becomes RL513.
> In any case, the research I have done tells me that relay has always
> been problematic in a LOT of Icoms.
> HAVE FUN!!!
>
> 73 and gud luk
>
> ron
>
> N4UE
>
>
> -----Original Message-----
> From: W9MWS at aol.com
> To: icom at mailman.qth.net
> Sent: Wed, 12 Nov 2008 2:56 pm
> Subject: Re: [ICOM] IC-765
>
>
>
> Thanks for the reply Gary. No, the S meter is at rest on the left side
> of
> the meter face ... ZERO signal showing. As soon as I bang on the 20
> meter
> button, the audio comes alive. Had a reply from a fellow with a 761
> that had
> the
> same issue with audio ... his was in the T/R relay and cleaning it
> fixed the
> problem.
>
> As for the display, I suspect lowered voltage but I haven't been inside
> the
> box yet. We'll see. It could also be the result of some rough handling
> in
> shipment from Orlando to Fort Wayne.
>
> 73, Mike W9MWS
> **************Get the Moviefone Toolbar. Showtimes, theaters, movie
> news &
> more!(http://pr.atwola.com/promoclk/100000075x1212774565x1200812037/aol?r
> edir=htt
> p://toolbar.aol.com/moviefone/download.html?ncid=emlcntusdown00000001)
> ----
> 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/
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 16 Nov 2008 06:36:49 -0800
> From: Jack/W6NF <vhfplus at bmg50.com>
> Subject: [ICOM] IC-765 transmit audio problem
> To: ICOM Reflector <icom at mailman.qth.net>
> Message-ID: <49203001.3040909 at bmg50.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Just in time for the SSB Sweepstakes (of course), and after not being
> used on SSB for a month or more, my '765 seems to have developed a
> transmit audio problem. To get any RF output with modulation the mic
> gain control must be turned up full resulting in only about 10 watts of
> RF output and almost no deflection of either ALC or compression meter
> positions. That amount of output requires almost hollering into the mic!
> With computer-generated audio being fed into the audio input port on the
> DIN connector on the rear apron the output power is normal. I have tried
> a second microphone with the same results.
>
> I've seen similar symptoms in broadcast audio gear when electrolytic
> coupling capacitors age and dry out but since I have no service manual
> or schematic on this rig I don't know if that is possible in the '765.
> Has anyone seen similar symptoms and come to any diagnosis?
>
> Thanks,
>
> Jack, W6NF
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 16 Nov 2008 08:05:38 -0700
> From: "Mike Olbrisch" <mike-2007 at elp.rr.com>
> Subject: RE: [ICOM] IC-765 transmit audio problem
> To: "'ICOM Reflector'" <icom at mailman.qth.net>
> Message-ID: <F866A9EC02FA41BEB5E0A0F4B7CD37A1 at RadioRoom>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Don't know about the 765, but earlier (740-745) had a problem with the
> compressor switch.  Symptoms were much as you describe.  Replacing it 
> would
> restore full output.  Cleaners didn't cut it, only replacing the switch 
> was
> a
> permanent fix.
>
> Hope that helps.
>
> Mike - KD9KC.
> El Paso, Tx.
> DM61rt
>
> Molon labe. [mo-lone lah-veh] Google it...
>
> =============================================
> The United States Constitution (c) 1791. All Rights reserved.
> =============================================
>
>> -----Original Message-----
>> From: icom-bounces at mailman.qth.net
>> [mailto:icom-bounces at mailman.qth.net] On Behalf Of Jack/W6NF
>> Sent: Sunday, November 16, 2008 7:37 AM
>> To: ICOM Reflector
>> Subject: [ICOM] IC-765 transmit audio problem
>>
>> Just in time for the SSB Sweepstakes (of course), and after
>> not being used on SSB for a month or more, my '765 seems to
>> have developed a transmit audio problem.
>
>
>
> ------------------------------
>
> Message: 5
> Date: Sun, 16 Nov 2008 07:50:38 -0800
> From: "Dave K6DLW" <k6dlw at charter.net>
> Subject: Re: [ICOM] IC-765 transmit audio problem
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Message-ID: <B9A1E26B085541F9A6F0EAE58515A0EF at LAPTOP1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
> Here is a link to the Icom web site for a similar problem.
> http://www.icomamerica.com/en/support/kb/Article.aspx?ArticleNumber=5BBA592A
> 68
>
> I have VE3HUR's document and some other 765 doc's I can send you. Let me
> know.
>
> 73
> Dave K6DLW
>
> ----- Original Message ----- 
> From: "Jack/W6NF" <vhfplus at bmg50.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Sunday, November 16, 2008 6:36 AM
> Subject: [ICOM] IC-765 transmit audio problem
>
>
>> Just in time for the SSB Sweepstakes (of course), and after not being 
>> used
>
>> on SSB for a month or more, my '765 seems to have developed a transmit
>> audio problem. To get any RF output with modulation the mic gain control
>> must be turned up full resulting in only about 10 watts of RF output and
>> almost no deflection of either ALC or compression meter positions. That
>> amount of output requires almost hollering into the mic! With
>> computer-generated audio being fed into the audio input port on the DIN
>> connector on the rear apron the output power is normal. I have tried a
>> second microphone with the same results.
>>
>> I've seen similar symptoms in broadcast audio gear when electrolytic
>> coupling capacitors age and dry out but since I have no service manual or
>> schematic on this rig I don't know if that is possible in the '765. Has
>> anyone seen similar symptoms and come to any diagnosis?
>>
>> Thanks,
>>
>> Jack, W6NF
>> ----
>> 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/
>
>
>
> ------------------------------
>
> Message: 6
> Date: Sun, 16 Nov 2008 08:35:50 -0800
> From: Jack/W6NF <vhfplus at bmg50.com>
> Subject: Re: [ICOM] IC-765 transmit audio problem
> To: ICOM Reflector <icom at mailman.qth.net>
> Message-ID: <49204BE6.5030301 at bmg50.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Dave K6DLW wrote:
>> Here is a link to the Icom web site for a similar problem.
>>
> http://www.icomamerica.com/en/support/kb/Article.aspx?ArticleNumber=5BBA592A
> 68
>>
>>
>> I have VE3HUR's document and some other 765 doc's I can send you. Let
>> me know.
>>
>> 73
>> Dave K6DLW
> Thanks for the ICOM link, Dave, I appreciate it. I will take the rig to
> work tomorrow and see if this solves my problem.
>
> I do have a copy of VE3HUR's IC-765 Notes (v1.08, dated December 17,
> 2005...is there a more recent version?).
>
> 73,
>
> Jack, W6NF
>
>
> ------------------------------
>
> Message: 7
> Date: Sun, 16 Nov 2008 08:41:13 -0800
> From: Jack/W6NF <vhfplus at bmg50.com>
> Subject: Re: [ICOM] IC-765 transmit audio problem
> To: ICOM Reflector <icom at mailman.qth.net>
> Message-ID: <49204D29.7050804 at bmg50.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Mike Olbrisch wrote:
>> Don't know about the 765, but earlier (740-745) had a problem with the
>> compressor switch.  Symptoms were much as you describe.  Replacing it
> would
>> restore full output.  Cleaners didn't cut it, only replacing the switch
> was a
>> permanent fix.
>>
>> Hope that helps.
>>
>> Mike - KD9KC.
>> El Paso, Tx.
>> DM61rt
>>
> Hi, Mike:
>
> Doesn't seem to be the compressor switch but I will check that further.
> Someone did send me a link to ICOM that had this information and,
> although I did not have any indications of raspy/distorted audio, this
> symptom fits my situation exactly:
>
>>
>>       Knowledge Base Article 5BBA592A68
>>
>> Issue
>> Distorted/raspy-sounding TX in SSB modes on my 765. Average power is
>> low, even at higher mic gain levels. Turning on the speech processor
>> seems to help a little. CW, RTTY and FM seems normal.
>>
>> Resolution
>> No bias voltage to driver or PA transistors. Measure voltages at bases
>> of driver and PA transistors in TX SSB mode. Should be around .67
>> volts. 0 volts indicates trouble.
>>
>> To fix:
>> Replace bad Q6 transistor (2SD880Y) on PA unit. If problem is
>> intermittent, check for bad solder at the legs of Q6 transistor, or D2
>> diode.
>>
>> Category
>> Amateur : HF : 765
>>
>
> Thanks for the suggestion!
>
> 73,
>
> Jack, W6NF
>
>
>
> ------------------------------
>
> Message: 8
> Date: Sun, 16 Nov 2008 09:44:47 -0800
> From: "Dave K6DLW" <k6dlw at charter.net>
> Subject: Re: [ICOM] IC-765 transmit audio problem
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Message-ID: <0D64C6E177694DDB9B4D44561A8A6C27 at LAPTOP1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
> I don't know of a more recent one.
>
> ----- Original Message ----- 
> From: "Jack/W6NF" <vhfplus at bmg50.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Sunday, November 16, 2008 8:35 AM
> Subject: Re: [ICOM] IC-765 transmit audio problem
>
>
>> Dave K6DLW wrote:
>>> Here is a link to the Icom web site for a similar problem.
>>>
> http://www.icomamerica.com/en/support/kb/Article.aspx?ArticleNumber=5BBA592A
> 68
>>>
>>> I have VE3HUR's document and some other 765 doc's I can send you. Let me
>>> know.
>>>
>>> 73
>>> Dave K6DLW
>> Thanks for the ICOM link, Dave, I appreciate it. I will take the rig to
>> work tomorrow and see if this solves my problem.
>>
>> I do have a copy of VE3HUR's IC-765 Notes (v1.08, dated December 17,
>> 2005...is there a more recent version?).
>>
>> 73,
>>
>> Jack, W6NF
>> ----
>> 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/
>
>
>
> ------------------------------
>
> Message: 9
> Date: Mon, 17 Nov 2008 17:09:14 -0600
> From: "John Klokis" <klokis at verizon.net>
> Subject: [ICOM] from K3JK
> To: <icom at mailman.qth.net>
> Message-ID: <6DF6C3F6CF6B44BA89FFF5E7B3D80389 at JohnPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello everyone:
> I am trying to read the posts on serial numbers of my 746 Pro.  I have 
> read
> that above 3351 are ok.  does this mean xxx3351?   my serial number is
> 0202855.   Is this number considered problematic with the transmit 
> failure?
> It is below 3351, and from what I can understand, the last four numbers 
> are
> what you go by.  I might have a problem with the ic-151 issues?   thanks,
> John K3JK
>
> ------------------------------
>
> Message: 10
> Date: Mon, 17 Nov 2008 16:39:37 -0600 (CST)
> From: harrytheham at verizon.net
> Subject: RE: [ICOM] from K3JK
> To: ICOM Reflector <icom at mailman.qth.net>
> Message-ID:
> <155287126.1342731226961577821.JavaMail.javamailuser at localhost>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
>
>  John,
>
> I believe the serial numbers with 7 digits (e.g., 0202855) are assigned
> to units that have been upgraded/modified by Icom during the
> manufacturing process. Hence, they reflect later production runs
> (probably starting about 2 or 3 years ago) than the 4 or 5 digit serial
> number (e.g., 3351).  So in theory the IC-151 issue was taken care of by
> the factory with your unit.
>
> Harry WE1X
>
> On Mon, Nov 17, 2008 at  6:09 PM, John Klokis wrote:
>
>> Hello everyone:
> I am trying to read the posts on serial numbers of my 746 Pro.B  I have
> read that above 3351 are ok.B  does this mean xxx3351?B B  my serial 
> number
> is 0202855.B B  Is this number considered problematic with the transmit
> failure? It is below 3351, and from what I can understand, the last four
> numbers are what you go by.B  I might have a problem with the ic-151
> issues?B B  thanks, John K3JK
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> <mailto:icom-owner at mailman.qth.net> B
> <mailto:icom-owner at mailman.qth.net>
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/ <http://www.qsl.net/icom/> B
> <http://www.qsl.net/icom/>
>
>
> ------------------------------
>
> Message: 11
> Date: Mon, 17 Nov 2008 18:09:40 -0600
> From: "John Klokis" <klokis at verizon.net>
> Subject: Re: [ICOM] from K3JK
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Message-ID: <246E68404C424FCA9D938122A915FF6A at JohnPC>
> Content-Type: text/plain; format=flowed; charset=UTF-8;
> reply-type=response
>
> thanks for the information Harry, I appreciate it.    And I also have read
> that the screen brightness should be run at full brightness to prevent the
> display from burning out.  Is this correct Harry?   Thanks you sir,  John
> K3JK
>
>
> ----- Original Message ----- 
> From: <harrytheham at verizon.net>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Monday, November 17, 2008 4:39 PM
> Subject: RE: [ICOM] from K3JK
>
>
>
>  John,
>
> I believe the serial numbers with 7 digits (e.g., 0202855) are assigned
> to units that have been upgraded/modified by Icom during the
> manufacturing process. Hence, they reflect later production runs
> (probably starting about 2 or 3 years ago) than the 4 or 5 digit serial
> number (e.g., 3351).  So in theory the IC-151 issue was taken care of by
> the factory with your unit.
>
> Harry WE1X
>
> On Mon, Nov 17, 2008 at  6:09 PM, John Klokis wrote:
>
>> Hello everyone:
> I am trying to read the posts on serial numbers of my 746 Pro. I have
> read that above 3351 are ok. does this mean xxx3351? my serial number
> is 0202855. Is this number considered problematic with the transmit
> failure? It is below 3351, and from what I can understand, the last four
> numbers are what you go by. I might have a problem with the ic-151
> issues? thanks, John K3JK
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> <mailto:icom-owner at mailman.qth.net>
> <mailto:icom-owner at mailman.qth.net>
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/ <http://www.qsl.net/icom/>
> <http://www.qsl.net/icom/>
> ----
> 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/
>
>
>
> ------------------------------
>
> _______________________________________________
> Icom mailing list
> Icom at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/icom
>
>
> End of Icom Digest, Vol 5, Issue 304
> ************************************
>
> ----
> 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/

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