sci.electronics.repair - 13 new messages in 8 topics - digest

sci.electronics.repair
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Today's topics:

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TOPIC: Any Lighting experts on here ... ?
http://groups.google.com/group/sci.electronics.repair/t/75b7c3eccbec375b?hl=en
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== 1 of 1 ==
Date: Sat, Jul 3 2010 5:26 pm
From: "Arfa Daily"

"Bob AZ" <rwatson767@aol.com> wrote in message
news:17d222a2-3269-45a3-bf3e-132beef1899d@y32g2000prc.googlegroups.com...
> So, does anyone know what the official designation of this
>> style of bulb is, or a name or designation for the holder, so that I can
>> be
>> a bit more targeted with search strings ? Or of course, if anyone knows
>> of
>> a source for them ... :-)
>>
>> TIA
>>
>> Arfa
>
>
> Arfa
>
> www.bulbman.com They are in Nevada USA. Great place. They ship
> eveywhere. And Leviton and Sylvania are also sources.
>
> Bob AZ

Thanks Bob. Duly noted, and shoved in my Favourites ...

Arfa

==============================================================================
TOPIC: Old Solder
http://groups.google.com/group/sci.electronics.repair/t/1325a43abbae0cc1?hl=en
==============================================================================

== 1 of 6 ==
Date: Sat, Jul 3 2010 6:19 pm
From: none@given.now (Joe)

A couple of days ago I did a small repair to an electronic timer. It just
need a bit of solder to reconnect a wire.

I had a devil of a time with that small repair, the solder just didn't
want to flow over the wire and onto the pad on the PCB.

A little while later, it occurred to me that maybe the problem was that I
had used some old solder - about a foot or so are remaining on probably a
5 or 10 foot spool.

The big Aha! came when I realized that all during that soldering attempt,
there was absolutely no odor of rosin flux.

Questions:

Are there any obvious ways to tell if old solder has lost its flux, other
than trying it out on say, soldering some scrap wire?

What happened to the rosin core of that solder? It doesn't look like the
end was left open.

Is there a definite life for unused solder?

--- Joe

== 2 of 6 ==
Date: Sat, Jul 3 2010 6:54 pm
From: John Fields

On Sat, 03 Jul 2010 18:19:10 -0700, none@given.now (Joe) wrote:

>A couple of days ago I did a small repair to an electronic timer. It just
>need a bit of solder to reconnect a wire.
>
>I had a devil of a time with that small repair, the solder just didn't
>want to flow over the wire and onto the pad on the PCB.
>
>A little while later, it occurred to me that maybe the problem was that I
>had used some old solder - about a foot or so are remaining on probably a
>5 or 10 foot spool.
>
>The big Aha! came when I realized that all during that soldering attempt,
>there was absolutely no odor of rosin flux.
>
>Questions:
>
>Are there any obvious ways to tell if old solder has lost its flux, other
>than trying it out on say, soldering some scrap wire?
>
>What happened to the rosin core of that solder? It doesn't look like the
>end was left open.
>
>Is there a definite life for unused solder?

---
Dunno.

I've got rolls of Kester and Ersin that I bought years and years ago
where I can still smell the fresh Frankincense and Myrrh and are hard
to make a cold joint with, and I've got some Alpha and some other
brand that I wouldn't use on plumbing without external flux.

Do you know whose solder you're using?

== 3 of 6 ==
Date: Sat, Jul 3 2010 8:41 pm
From: Grant

On Sat, 03 Jul 2010 18:19:10 -0700, none@given.now (Joe) wrote:

Got to try it, I think. I don't like using solder so old it's turned
black.
>
>What happened to the rosin core of that solder? It doesn't look like the
>end was left open.

I've seen really old solder where the rosin leaked out the end or oozed
out along the solder wire.
>
>Is there a definite life for unused solder?

Not that I know of, but oldest solder I have here is only ten or twelve
years, it used to be in the boot of a previous car, it's really dirty
so I left it in a box somewhere.

Grant.

== 4 of 6 ==
Date: Sat, Jul 3 2010 8:52 pm
From: "Michael Robinson"

"Joe" <none@given.now> wrote in message
news:none-0307101819110001@dialup-4.231.175.251.dial1.losangeles1.level3.net...
>A couple of days ago I did a small repair to an electronic timer. It just
> need a bit of solder to reconnect a wire.
>
> I had a devil of a time with that small repair, the solder just didn't
> want to flow over the wire and onto the pad on the PCB.
>
> A little while later, it occurred to me that maybe the problem was that I
> had used some old solder - about a foot or so are remaining on probably a
> 5 or 10 foot spool.
>
> The big Aha! came when I realized that all during that soldering attempt,
> there was absolutely no odor of rosin flux.
>
> Questions:
>
> Are there any obvious ways to tell if old solder has lost its flux, other
> than trying it out on say, soldering some scrap wire?
>
> What happened to the rosin core of that solder? It doesn't look like the
> end was left open.
>
> Is there a definite life for unused solder?
>
> --- Joe

Maybe the rosin dried out.
Also you need a clean surface for the solder to flow onto. Even with good
solder, you can have problems if the copper is oxidized and dirty. It's
very hard to solder to tarnished copper parts.
If cleaning is impractical, it helps to dab some flux on it before
attempting to solder.
How heavy was the part or wire you were soldering? The soldering tip must
have more thermal mass than the part you're soldering.

== 5 of 6 ==
Date: Sat, Jul 3 2010 10:05 pm
From: none@given.now (Joe)

In article <lppv261quq572fj413r2uaupde4a5pvtua@4ax.com>, John Fields
<jfields@austininstruments.com> wrote:

> On Sat, 03 Jul 2010 18:19:10 -0700, none@given.now (Joe) wrote:
>
> >A couple of days ago I did a small repair to an electronic timer. It just
> >need a bit of solder to reconnect a wire.
> >
> >I had a devil of a time with that small repair, the solder just didn't
> >want to flow over the wire and onto the pad on the PCB.
> >
> >A little while later, it occurred to me that maybe the problem was that I
> >had used some old solder - about a foot or so are remaining on probably a
> >5 or 10 foot spool.
> >
> >The big Aha! came when I realized that all during that soldering attempt,
> >there was absolutely no odor of rosin flux.
> >
> >Questions:
> >
> >Are there any obvious ways to tell if old solder has lost its flux, other
> >than trying it out on say, soldering some scrap wire?
> >
> >What happened to the rosin core of that solder? It doesn't look like the
> >end was left open.
> >
> >Is there a definite life for unused solder?
>
> ---
> Dunno.
>
> I've got rolls of Kester and Ersin that I bought years and years ago
> where I can still smell the fresh Frankincense and Myrrh and are hard
> to make a cold joint with, and I've got some Alpha and some other
> brand that I wouldn't use on plumbing without external flux.
>
> Do you know whose solder you're using?

John,

I have two spools of Radio Shack 63/37 rosin-core solder. One of the
spools is almost empty (the one that I had the problem trying to solder
with), the other looks at least half full.

Both spools have the Radio Shack stock number 64-015, but they have
different artwork on their labels, and the old plastic spool is black, the
newer plastic spool is white.

The older spool quite possibly dates back to around 1980.

--- Joe

== 6 of 6 ==
Date: Sat, Jul 3 2010 11:33 pm
From: stratus46@yahoo.com

On Jul 3, 6:19 pm, n...@given.now (Joe) wrote:
> A couple of days ago I did a small repair to an electronic timer. It just
> need a bit of solder to reconnect a wire.
>
> I had a devil of a time with that small repair, the solder just didn't
> want to flow over the wire and onto the pad on the PCB.
>
> A little while later, it occurred to me that maybe the problem was that I
> had used some old solder - about a foot or so are remaining on probably a
> 5 or 10 foot spool.
>
> The big Aha! came when I realized that all during that soldering attempt,
> there was absolutely no odor of rosin flux.
>
> Questions:
>
> Are there any obvious ways to tell if old solder has lost its flux, other
> than trying it out on say, soldering some scrap wire?
>
> What happened to the rosin core of that solder? It doesn't look like the
> end was left open.
>
> Is there a definite life for unused solder?
>
> --- Joe

I have some Ersin I bought around 1990 - about 6 oz. left. Had no
problem with it last week.

G²

==============================================================================
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http://groups.google.com/group/sci.electronics.repair/t/0f6e6fc9ad0ed72f?hl=en
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== 1 of 1 ==
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http://groups.google.com/group/sci.electronics.repair/t/30083aacdb5197d9?hl=en
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Date: Sat, Jul 3 2010 8:01 pm
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==============================================================================
TOPIC: Radio Sound Schematic Help
http://groups.google.com/group/sci.electronics.repair/t/98ed6b260744b027?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 3 2010 9:00 pm
From: "Big Duke"

Hi all,

Can anyone help me. I need a radio schematic for a Radio Sound Model
76164-96 that was on a 1997 Harley Davidson Ultra Classic Motorcycle. I
contacted radio sound corp. and they referred me to the local Harley dealer.
When I talked to the local dealer they almost laughed in my face. Is there
anyone that can help me with a schematic for this radio? Thanks for reading
my post

Duke

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

==============================================================================
TOPIC: Sanyo CRT-tv. HOT tested bad. Transformer noisy. What next?
http://groups.google.com/group/sci.electronics.repair/t/32324e08982f8dea?hl=en
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== 1 of 1 ==
Date: Sat, Jul 3 2010 9:51 pm
From: Meatman

Me, OP: Ok, so I have some work to try to do 8^) Please clarify
right quick: Is the SMPS suspect at this point? Or can it reasonably
be eliminated as a likely problem? Just your best experienced guess.
Thx again. Kevin.

==============================================================================
TOPIC: OT: a presentation on Lead-free solder
http://groups.google.com/group/sci.electronics.repair/t/527a6b18f25279a3?hl=en
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== 1 of 1 ==
Date: Sun, Jul 4 2010 12:00 am
From: "N_Cook"

I'm constructing a talk/presentation on PbF for the local-to-me part of the
science cafe movement
http://www.cafescientifique.org/
Title something like
A 21 century plague: some reasons for failures/problems in electronic
equipment.

If anyone knows of a public domain published like-for-like test of
conventional between conventional and Pbf boards+components ?
I suspect accelerated aging via thermal +humidity cycling and vibration to
show something like a 3 to 1 advancement of aging before solder faults
emerge, but cannot find any such published results.

Anyone here familiar with automobile engine management / control electronics
issues with PbF, not in-car entertainment issues.

Anyone familiar with de-tinning of tin-tinned components / deballing
+reballing of BGA etc in the defense/aerospace/medical spheres?

My email address for anyone not wishing to be on public record ,
divZZZZZZerse9@oneZZZZZZtel.com,
minus the ZZZs. Small text only not pics or large files, I can relay a
non-internet account for that purpose , if necessary.

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TOPIC: Old garage light fixture with no sign of existing switch
http://groups.google.com/group/sci.electronics.repair/t/25109a2423d6f22a?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Jul 4 2010 12:35 am
From: Jim

A general thanks to all who replied. I know this was a long shot for an
online question.

The main mystery is that the only visible switches control the inside
garage light (seen in photo) and the light outside the small garage door.
It is not a detached garage, as someone implied.

If one of those two wall switches (inside the garage) also controls the
high outside garage light, it wasn't a very practical setup - to have two
lights on at once, inside and out. Is that a known common configuration
from the old days?

Taking apart the wires in the box isn't practical at the moment (long
story) but I'm sure some answer lies therein. I might end up bypassing the
existing wire entirely and routing a temp. wire from a regular wall plug.

Jim

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