[ICOM] 765 freq problem

[Marc & Tricia Niebergall]

Oddly enough, that is exactly what I did and so far it is working. I have
ordered the new trimmers anyway.
On Feb 28, 2015 11:11 AM, "jkolin" <jkolin at optonline.net> wrote:

> Marc....
>
> Just rotate the trimmers back & forth about 20 times.
>
> Of course mark the orig positions first.
>
>  Radio shud the be stable another 4-5 yrs. Worked for me.
>
>
> Sent by Low Powered, Ultra High Frequency RADIO Transmitter
>
> NE2Q
>
> <div>-------- Original message --------</div><div>From: Marc & Tricia
> Niebergall <mtniebs at gmail.com> </div><div>Date:02/28/2015  10:45 AM
> (GMT-05:00) </div><div>To: ICOM Reflector <icom at mailman.qth.net>
> </div><div>Subject: Re: [ICOM] 765 freq problem </div><div>
> </div>I have begun the troubleshooting and started with the infamous PLL
> trimmer
> capacitors.  I measured the voltages on the four trimmers according to the
> service manual and each trimmer was high by about 0.3 or 0.4 vdc.  I
> re-trimmed to exactly 6.5vdc on the precise freqs and checked about 1/2
> hour later.  The voltages had drifted about 0.3 volts high.  My question:
> Is this normal or is this an indication that the plastic trimmers are in
> fact in need of replacement?  I would think the voltages should stay
> constant at the freqs listed once re-adjusted.
>
> Marc
>
> On Thu, Feb 26, 2015 at 12:43 PM, Marc & Tricia Niebergall <
> mtniebs at gmail.com> wrote:
>
> > Tnx to all the contributors for the wealth of knowledge. My suspicions
> are
> > that the solution lies therein.
> >
> > I'll post my results for others to benefit as I have.
> >
> > Marc-k7wxk
> > On Feb 26, 2015 9:28 AM, "D. Jones" <djoneses at verizon.net> wrote:
> >
> >> Mouser has the Sprague GKG10015 in stock for 60 cents each.  Comparing
> >> specs with the GKG10024 it seems these should work although they are
> 2.3 mm
> >> taller. I don't know if that is an issue.  The Mouser part number is:
> >> 659-GKG10015.
> >>
> >> David
> >>
> >> <div>-------- Original message --------</div><div>From: Marc & Tricia
> >> Niebergall <mtniebs at gmail.com> </div><div>Date:02/26/2015  10:52 AM
> >> (GMT-05:00) </div><div>To: ICOM Reflector <icom at mailman.qth.net>
> >> </div><div>Subject: Re: [ICOM] 765 freq problem </div><div>
> >> </div>Rich,
> >>
> >> Thanks for the additional info. It seems that the part numbers are
> pretty
> >> scarce, so I would welcome any new info regarding availability of
> ceramic
> >> trimmers.
> >>
> >> Marc
> >> On Feb 26, 2015 7:42 AM, "Rich Dailey" <redailey1 at gmail.com> wrote:
> >>
> >> > I'm the author of that page. I need to mention that I'm not sure of
> the
> >> > availablility of the replacement trimmers that are mentioned in the
> >> > article. If someone has a good link to a supplier of substitutes, I'll
> >> > update the page to add those links. Been a lot of years.
> >> >
> >> > Also, I'll throw in that I recall having one on the bench that had a
> >> > sililar drift situation. I replaced the trimmers, AND
> >> > 10uf bypass caps coming off a 5 volt regulator. They were pulling hard
> >> on
> >> > that supply voltage. Seems
> >> > it was on the board under the power supply, on a long, shared heat
> sink
> >> > with other regulators. Like I said,
> >> > it's been many years, my brain is foggy, but that's what I remember.
> >> >
> >> > Rich, N8UX
> >> >
> >> > On Thu, Feb 26, 2015 at 4:57 AM, rrocket88 at netzero.net <
> >> > rrocket88 at netzero.net> wrote:
> >> >
> >> > > here is an old descriptive i've had filed away, was going to perform
> >> but
> >> > > health went south  good luck K4IMZ
> >> > >
> >> > > http://home.windstream.net/ferncity/icom.htm
> >> > >
> >> > >
> >> > ----
> >> > 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
> >> ----
> >> 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
> ----
> 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