[ICOM] RE: ICOM 746PRO Screen Brightness from K3JK
Ed Myers
emyers2 at cox.net
Tue Nov 18 00:38:59 EST 2008
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
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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 &
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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/
------------------------------
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