I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks

Greg Esres wrote:
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks


I have one about that old. Any minor power glitch and the memory goes. I
just plain gave up because I get a minor power glitch every few days and
it's not worth putting the thing on a battery backup.

vey wrote:
Greg Esres wrote:
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks


I have one about that old. Any minor power glitch and the memory goes. I
just plain gave up because I get a minor power glitch every few days and
it's not worth putting the thing on a battery backup.

Hi...

It's likely that there's one filter cap whose sole purpose is to
hold those settings for a while... you may want to consider
changing it.

Take care.

Ken

In many of these types of receivers, there is either a gold leaf capacitor,
or a battery backup.

For the gold leaf capacitor they are usually in the order of about 0.4 Farad
to about 0.5 Farad. The voltage rating can be from about 3.5 VDC to about
5.5 VDC.

If the set uses a battery for the memory backup, it may be very similar to
that is used in many of the mother boards of computers. They are usually in
the range of 3 VDC.

You have to be careful when changing parts in these receivers. Most of the
time, the battery may be with hard contacts and soldered to the circuit
board.

--

JANA
_____


"Greg Esres" wrote in message
oups.com...
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks

JANA wrote in message
...
In many of these types of receivers, there is either a gold leaf
capacitor,
or a battery backup.

For the gold leaf capacitor they are usually in the order of about 0.4
Farad
to about 0.5 Farad. The voltage rating can be from about 3.5 VDC to about
5.5 VDC.

If the set uses a battery for the memory backup, it may be very similar to
that is used in many of the mother boards of computers. They are usually
in
the range of 3 VDC.

You have to be careful when changing parts in these receivers. Most of the
time, the battery may be with hard contacts and soldered to the circuit
board.

--

JANA
_____


"Greg Esres" wrote in message
oups.com...
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks



You had me worried there for a moment - that I'd been throwing gold leaf in
the trash. Anyone know what the construction is of these fractional farad
memory retention caps ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

"Greg Esres" wrote in message
oups.com...
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks


Onkyo's generally use a memory backup cap. May not be readily accessible. A
model number would help...

Mark Z.

"N Cook" wrote in message
...

JANA wrote in message
...
In many of these types of receivers, there is either a gold leaf
capacitor,
or a battery backup.

For the gold leaf capacitor they are usually in the order of about 0.4
Farad
to about 0.5 Farad. The voltage rating can be from about 3.5 VDC to about
5.5 VDC.

If the set uses a battery for the memory backup, it may be very similar
to
that is used in many of the mother boards of computers. They are usually
in
the range of 3 VDC.

You have to be careful when changing parts in these receivers. Most of
the
time, the battery may be with hard contacts and soldered to the circuit
board.

--

JANA
_____


"Greg Esres" wrote in message
oups.com...
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks



You had me worried there for a moment - that I'd been throwing gold leaf
in
the trash. Anyone know what the construction is of these fractional farad
memory retention caps ?


One of the trade names for them was "Goldcaps" I think - it's certainly a
name that I use for them - but I wasn't aware that gold was in any way part
of the construction. Even if it is, gold leaf, or gold in such tiny
quantities as would be in such an item, is valueless, unless you have a lot
of it passing through your hands, as the recyclers of computer mother boards
do. I saw a programme on that brilliant "How do they do that ?" series on
Sky the other day, where they were removing all the gold plating from the
connectors and CPU pins. They were dealing in skip-loads of the stuff, and
recovering a very respectable amount of gold, but it was hard work ...

Arfa

Arfa Daily wrote in message
...

"N Cook" wrote in message
...

JANA wrote in message
...
In many of these types of receivers, there is either a gold leaf
capacitor,
or a battery backup.

For the gold leaf capacitor they are usually in the order of about 0.4
Farad
to about 0.5 Farad. The voltage rating can be from about 3.5 VDC to
about
5.5 VDC.

If the set uses a battery for the memory backup, it may be very similar
to
that is used in many of the mother boards of computers. They are
usually
in
the range of 3 VDC.

You have to be careful when changing parts in these receivers. Most of
the
time, the battery may be with hard contacts and soldered to the circuit
board.

--

JANA
_____


"Greg Esres" wrote in message
oups.com...
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks



You had me worried there for a moment - that I'd been throwing gold leaf
in
the trash. Anyone know what the construction is of these fractional
farad
memory retention caps ?


One of the trade names for them was "Goldcaps" I think - it's certainly a
name that I use for them - but I wasn't aware that gold was in any way
part
of the construction. Even if it is, gold leaf, or gold in such tiny
quantities as would be in such an item, is valueless, unless you have a
lot
of it passing through your hands, as the recyclers of computer mother
boards
do. I saw a programme on that brilliant "How do they do that ?" series on
Sky the other day, where they were removing all the gold plating from the
connectors and CPU pins. They were dealing in skip-loads of the stuff, and
recovering a very respectable amount of gold, but it was hard work ...

Arfa



But how do they separate the gold surface film from the underlay of bronze
or whatever that goes between base metal core and the gold?

I used to know someone who cropped the edge connectors off old computer
boards from the 60s and 70s whan there was serious gold plating.
2 and 1/2 small tubs abot 10 inch diameter x 18 inch high bought him a new
Transit van.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

"N Cook" wrote in message
...

Arfa Daily wrote in message
...

"N Cook" wrote in message
...

JANA wrote in message
...
In many of these types of receivers, there is either a gold leaf
capacitor,
or a battery backup.

For the gold leaf capacitor they are usually in the order of about 0.4
Farad
to about 0.5 Farad. The voltage rating can be from about 3.5 VDC to
about
5.5 VDC.

If the set uses a battery for the memory backup, it may be very
similar
to
that is used in many of the mother boards of computers. They are
usually
in
the range of 3 VDC.

You have to be careful when changing parts in these receivers. Most of
the
time, the battery may be with hard contacts and soldered to the
circuit
board.

--

JANA
_____


"Greg Esres" wrote in message
oups.com...
I have a 20-year-old Onkyo receiver that has some radio presets that
have *never* held their settings for more than a couple of days. Is
it likely there are any user-serviceable parts inside that I might
could replace to make this function correctly?

Thanks



You had me worried there for a moment - that I'd been throwing gold
leaf
in
the trash. Anyone know what the construction is of these fractional
farad
memory retention caps ?


One of the trade names for them was "Goldcaps" I think - it's certainly a
name that I use for them - but I wasn't aware that gold was in any way
part
of the construction. Even if it is, gold leaf, or gold in such tiny
quantities as would be in such an item, is valueless, unless you have a
lot
of it passing through your hands, as the recyclers of computer mother
boards
do. I saw a programme on that brilliant "How do they do that ?" series on
Sky the other day, where they were removing all the gold plating from the
connectors and CPU pins. They were dealing in skip-loads of the stuff,
and
recovering a very respectable amount of gold, but it was hard work ...

Arfa



But how do they separate the gold surface film from the underlay of bronze
or whatever that goes between base metal core and the gold?

I used to know someone who cropped the edge connectors off old computer
boards from the 60s and 70s whan there was serious gold plating.
2 and 1/2 small tubs abot 10 inch diameter x 18 inch high bought him a new
Transit van.



They used a combination of heating/melting and chemical separation, which
resulted in some gold salt or other, I think. Further chemical treatment at
a secret location, finished the job off. The final recovered product was
just about as pure as when it went on in the first place.

Arfa

Mark Z. wrote:

Onkyo's generally use a memory backup cap. May not be readily
accessible. A model number would help.

Sorry, I didn't expect that anyone would have info about a particular
model. It's a TX-35.

Thanks!

vey wrote:

I have one about that old. Any minor power glitch and the memory
goes. I
just plain gave up because I get a minor power glitch every few days
and
it's not worth putting the thing on a battery backup.


Yeah, I could never figure out the pattern. Although a minor
irritation, I noticed over the years that I used it less and less.
Those minor irritations build up.

JANA wrote:

You have to be careful when changing parts in these receivers. Most
of the
time, the battery may be with hard contacts and soldered to the
circuit
board.

That's what I was afraid of. If it requires soldering, then I'm I'm
not going to try it myself.

Thanks

Greg Esres wrote:
Mark Z. wrote:

Onkyo's generally use a memory backup cap. May not be readily
accessible. A model number would help.

Sorry, I didn't expect that anyone would have info about a particular
model. It's a TX-35.

Thanks!

Hi...

Didn't find you a free one - perhaps someone else can, but if you're
willing to pay a little for a repro of the service manual, here's
where you can find and order one...

http://www.vintageaudiomanuals.com/-O-.htm


Take care.

Ken

Greg Esres wrote:
JANA wrote:

You have to be careful when changing parts in these receivers. Most
of the
time, the battery may be with hard contacts and soldered to the
circuit
board.

That's what I was afraid of. If it requires soldering, then I'm I'm
not going to try it myself.


Hi yet again...

Everyone has someone in their life - a relative, friend, neighbor
that's competent at that level - ask around. Offer a soft drink
or a beer

Take care.

Ken

"Ken Weitzel" wrote in message
news:aTvti.33886$rX4.27575@pd7urf2no...
Greg Esres wrote:
Mark Z. wrote:

Onkyo's generally use a memory backup cap. May not be readily
accessible. A model number would help.

Sorry, I didn't expect that anyone would have info about a particular
model. It's a TX-35.

Thanks!

Hi...

Didn't find you a free one - perhaps someone else can, but if you're
willing to pay a little for a repro of the service manual, here's
where you can find and order one...

http://www.vintageaudiomanuals.com/-O-.htm


Take care.

Ken

The backup cap is C715, a .047F located on the digital pcb near the TC9147BP
tuning control IC. Although my service manual is not really clear where that
board is situated, it seems that it's somewhat buried in the front panel
ass'y.

Mark Z.

Ken wrote:

Everyone has someone in their life - a relative, friend, neighbor
that's competent at that level - ask around.

I'm usually the one that gets that sort of question, which just goes
to show how low standards have sunk these days. :-) I do software
and avoid hardware when I can; immaterial components are much easier
to work with. But I can replace components and do simple wiring.

Mark Z wrote:

The backup cap is C715, a .047F located on the digital pcb near the
TC9147BP
tuning control IC. Although my service manual is not really clear
where that
board is situated, it seems that it's somewhat buried in the front
panel
ass'y.

I'll take a look and see if something jumps out at me. Perhaps there
are labels.

Thanks for looking that up!

Ken wrote:

Didn't find you a free one - perhaps someone else can, but if
you're
willing to pay a little for a repro of the service manual, here's
where you can find and order one...

I might, if the task looks doable by me. Let me see what I can find
based on Mark Z's info.

Thank you!