[ICOM] IC-765 question

Wed Apr 22 23:49:19 EDT 2015

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
> > > >> ----
> > > >> Your Moderator: Dick
> > Flanagan
> K7VC:
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