[ICOM] 756 pro III noise

[Alex]

Excellent job, Jim! And thanks for reporting back on what the problem was.

Perhaps the owner rerouted the cables for a similar reason I did in the
FT-897 I wrote about earlier, except that he or she wasn't addressing the
real cause but a symptom (Yaesu did reroute the cables like I did in newer
models of the same radio). They heard the same noise as you did and rerouted
the cables. However, it was not the rerouting that fixed the problem for
them, but the reseating of the connectors resulted in better connections and
make the noise go away. In the mean time corrosion was still occurring and
the problem reared its ugly head again when you were the owner. You properly
cleaned the connectors as should have been done the first time the problem
occurred and the problem is now fixed.

Again, great job, and I'm glad you got this great radio back on the air!

73,
--Alex KR1ST
http://www.kr1st.com
http://www.airlinkexpress.org


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Jaime Gomez
Sent: Saturday, October 16, 2010 7:04 PM
To: ICOM Reflector
Subject: Re: [ICOM] 756 pro III noise

To close the issue, the radio was purchased second hand in USA. I found one
of the bottom cover screws changed and one missing, clear sign that the
radio was opened, so probably somebody opened the VCO compartment and by
some unknown reason rerouted the cables and didn't take good care when
replacing the cover and pinched the 3SLO cable.
Cheers to all who sent me answers to my mails.

73, Jim, HK1N

On Fri, Oct 15, 2010 at 1:16 PM, mikea <mikea at mikea.ath.cx> wrote:

> On Fri, Oct 15, 2010 at 12:47:52PM -0500, Jaime Gomez wrote:
> > Thanks to all who answered my request giving me their hints. I found 2
> coax
> > cables routed different than shown in the bottom view in the service
> manual
> > and found one contact of the connecting tape between the top and bottom
> > boards, the one that goes on the back left side, with signs of
corrosion.
> I
> > cleaned it while I can get a replacement tape.
> > Now the radio is working OK, no more annoying noise....
>
> That is *VERY* good news.
>
> Any idea how the cables got misrouted?
>
> --
> Mike Andrews, W5EGO
> mikea at mikea.ath.cx
> Tired old sysadmin
> ----
> 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
>



-- 
Jim, HK1N
----
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