[ICOM] IC-765 question

Wed Apr 22 23:51:24 EDT 2015

Great info, Ron. Thanks again.

Marc-k7wxk
On Apr 22, 2015 8:49 PM, "Ron via Icom" <icom at mailman.qth.net> wrote:

> Yep, the nice thing about the ESR testers is that:
> - you don't have to remove the component
> - the 'value' of the cap is shown
> - the ESR is shown
>
> You will find some old caps will be WAY out of spec. Electrolytic caps
> that are not used on a regular basis, will die early. That's why the older
> caps on the 'shelf' will usually be NFG. Newer 105 C rated caps will last
> almost forever, due to sealing / construction.
> If you need any more info, feel free to contact me directly.
> n4ue at arrl.net
>
> 73
>
> ron
> N4UE
>
>
>
>
>
>
>
> -----Original Message-----
> From: Marc & Tricia Niebergall <mtniebs at gmail.com>
> To: ICOM Reflector <icom at mailman.qth.net>
> Sent: Wed, Apr 22, 2015 11:30 pm
> Subject: Re: [ICOM] IC-765 question
>
>
> Kinda what I expected. Maybe it is time to invest in some new test
> equip.
>
> Thanks,
> Marc
> On Apr 22, 2015 8:27 PM, "Ron via Icom"
> <icom at mailman.qth.net> wrote:
>
> > No, I cannot suggest any specific caps. If you
> were to purchase an ESR
> > meter, you can test the caps 'in circuit' easily. It's
> a great tool. I have
> > several, but if you look on ePay, you can find some great
> ones, for the $.
> > When I refurb a radio (as I am doing with my 'new' Collins
> 75S-3), I
> > double check even the new ones. There is a range of ESR values that
> the
> > different values fall into.
> > I do a lot of Lafayette old radios and
> almost EVERY small value
> > electrolytic cap used in the different stages are
> 'bad'.......
> >
> > ron
> >
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: Marc &
> Tricia Niebergall <mtniebs at gmail.com>
> > To: ICOM Reflector
> <icom at mailman.qth.net>
> > Sent: Wed, Apr 22, 2015 11:17 pm
> > Subject: Re: [ICOM]
> IC-765 question
> >
> >
> > Thanks Ron.  I see that there about 12 or so electrolytics
> in this power
> > supply.
> > I have changed 3. Without the test equipment are there
> any you
> > would suspect
> > over others?
> > On Apr 22, 2015 7:49 PM, "Ron via Icom"
> <icom at mailman.qth.net>
> > wrote:
> >
> > > Hi, I have a large Icom collection and
> although I don't have a 765, I
> > do
> > > have a 761. If you do your own repairs
> as I do, the suggestion of
> > acquiring
> > > an ESR meter is HIGHLY recommended!
> >
> > I now have several and can
> > state that electrolytic caps are the one
> > >
> electronic component that does NOT
> > age well!
> > > I replace hundreds / year.
> >
> >
> > > ron
> > > N4UE
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > -----Original
> Message-----
> > > From: Marc & Tricia Niebergall
> > <mtniebs at gmail.com>
> > > To:
> ICOM Reflector <icom at mailman.qth.net>
> > > Sent: Wed, Apr
> > 22, 2015 4:34 pm
> > >
> Subject: Re: [ICOM] IC-765 question
> > >
> > >
> > > It's looking like
> > it is in the
> internal power supply.  I disconnected it
> > > and
> > > jumped a Yaesu
> > 13.8 vdc
> and "instant on".  Tried the internal power
> > > supply again
> > > and a
> > short
> "pause" before coming alive.  So, now it is just a
> > > matter of
> > > deciding
> >
> which components are likely the problem.  May start with
> > > all the big
> > >
> >
> electrolytics.  They are pretty old and probably getting
> > > suspect
> > >
> anyway.
> > >
> > >
> > Suggestions?
> > >
> > > Marc
> > >
> > > On Wed, Apr 22, 2015 at 1:13
> PM, Bert Almemo
> > >
> > <balmemo at sympatico.ca> wrote:
> > >
> > > > Most likely the
> internal PS. The 765 is
> > known
> > > for PS problems. If you have
> > > > an ESR
> meter, Equivalent Series
> > Resistor, you
> > > could possibly measure the
> > > >
> elec. Caps without removing them.
> > If not, maybe you
> > > can borrow from a
> > >
> > friend. It's a great tool to trouble
> > shoot elec.caps. Good
> > > luck!
> > > >
> >
> > > 73 Bert, VE3NR
> > > >
> > > >
> > > >
> > > >
> > -----Original Message-----
> > > >
> From: Icom
> > >
> > [mailto:icom-bounces at mailman.qth.net] On Behalf Of Marc &
> > > >
> Tricia
> > > >
> > >
> > Niebergall
> > > > Sent: Wednesday, April 22, 2015 2:29 PM
> > >
> > To: ICOM Reflector
> > >
> > >
> > > Subject: Re: [ICOM] IC-765 question
> > > >
> > > >
> Will try that, thanks.
> > > > On
> > Apr 22, 2015
> > > 11:26 AM, "GGLL"
> <nagato at madryndigital.com.ar> wrote:
> > > >
> > > > >
> > You may try to feed
> > > the
> rig with an external power supply to see if it
> > > > >
> > has the same
> behaviour.
> > > >
> > > >
> > > > > Regards
> > > > > Guillermo - LU5WE.
> > > > >
> > >
> >
> > > El 22/04/15 a las 15:08, Marc &
> > > Tricia Niebergall escibió:
> > > > >
> > >
> > >> When
> > pushing the AC on switch there is
> > > sometimes a pause of a
> couple
> > > > >> seconds
> > before the rig powers up.  Other
> > > times it comes on
> almost
> > > > >> instantly.
> > This usually occurs on the first
> > > application of
> the day.
> > > > >> Don't
> > > > >>
> > know if it is a relay or an electrolytic
> > >
> capacitor taking time to
> > > > >>
> > charge or what.  I changed two 33uf
> electrolytics
> > > in the power supply
> > > > >>
> > that were swollen, but no
> change.  Any suggestions are
> > > welcome.
> > > > >>
> > > > >>
> > Thanks,
> > > > >>
> Marc-k7wxk
> > > > >> ----
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> > > Flanagan
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