Digest for sci.electronics.repair@googlegroups.com - 12 updates in 4 topics

Mike Coon <gravity@mjcoon.plus.com>: May 30 12:47PM +0100

In article <6sf4bg5vmpgjk0jdolr61a8vhma0g6st12@4ax.com>,
news@spaced.me.uk says...
 
> Cheers, T i m
 
> p.s. Do you sail and if so what OOI? Dinghy sailor and son of a Shell
> Tanker Capt here. ;-)
 
2020 is the first year since 1974 that I have not been able to go on a
sailing holiday somewhere warm in the Summer! But it is decades since I
owned a sailing dinghy and have never owned any other boat. You
certainly know about the extremes! "OOI"?
T i m <news@spaced.me.uk>: May 30 04:45PM +0100

On Sun, 30 May 2021 12:47:54 +0100, Mike Coon
<gravity@mjcoon.plus.com> wrote:
 
<snip>
 
>> Tanker Capt here. ;-)
 
>2020 is the first year since 1974 that I have not been able to go on a
>sailing holiday somewhere warm in the Summer!
 
Shame. ;-(
 
> But it is decades since I
>owned a sailing dinghy and have never owned any other boat.
 
So you rent / charter something and if so what sort of thing?
 
>You
>certainly know about the extremes!
 
;-)
 
>"OOI"?
 
Sorry, 'Out Of Interest'.
 
Cheers, T i m
legg <legg@nospam.magma.ca>: May 30 09:59AM -0400

On Sat, 29 May 2021 22:38:19 -0500, Unlisted <unlisted@nomail.com>
wrote:
 
>SSM-1750
 
Replacing the transformer should be pretty simple, as
it only has to supply one audio board.
 
Check for regulators on the board. Commonly +-15V 3term.
 
A 27V or 30V centertapped winding (2x13V5 or 2x15V)
should provide +/- 18V to 21V after the rectifiers, to
feed those. You could temporarily substitute a bench
supply, to see if there was a major supply problem.
 
The aux lamp connector seems to expect 12Vdc.
 
Once it's running, you'd know if it actually needs more
in-depth repair.
 
RL
micky <NONONOmisc07@fmguy.com>: May 29 05:55PM -0400

Someone on Freecycle gave me a nice tv, pretty old, but comelete with
owners manual and remote control.
 
The remote works fine except for the buttons used the most, volume up
and down, channel up and down, power, and muting.
 
I took it apart and expected to find oxidized contact points, but no.
Instead those buttons, on the circuit board and on the buttons, are
shiny and a little bit sticky. I forced myself to taste it, but I don't
taste anything.
 
3 other buttons have a little of those, but no more than 4% of any
button.
 
What is this, how does it get in there, and [what do I do about it}?
 
I have DeoxitIT, what I've read is the best, but I guess I've never used
it before, and it didn't remove the stickiness. Not only that, these
contacts aren't copper-colored, and as the name impplied, it's really to
remove and prevent oxidization, so I switched to isopropyl alcohol and
that did a good job.
 
So I know what to do about it, but what is that stuff? Finger oil?
Rayner Lucas <usenet202101@magic-cookie.co.ukNOSPAMPLEASE>: May 30 01:36AM +0100

In article <grb5bghglhuog6va9id0b28aak632r957k@4ax.com>, NONONOmisc07
@fmguy.com says...
> Instead those buttons, on the circuit board and on the buttons, are
> shiny and a little bit sticky. I forced myself to taste it, but I don't
> taste anything.
 
[snip]
 
> So I know what to do about it, but what is that stuff? Finger oil?
 
I don't think I'm capable of feeling enough curiosity to taste a
substance I found inside someone else's remote control.
 
I'd bet on something like a spilled drink of some kind, KFC/pizza
grease, or some other such residue from someone's movie-night snacks.
 
R
whit3rd <whit3rd@gmail.com>: May 29 06:27PM -0700

On Saturday, May 29, 2021 at 2:55:31 PM UTC-7, micky wrote:
 
> contacts aren't copper-colored, and as the name impplied, it's really to
> remove and prevent oxidization, so I switched to isopropyl alcohol and
> that did a good job.
 
The liquid (I think) is a plastic component intended to keep it flexible; a
'plasticizer'. Lots of plastic formulations 'sweat' this stuff, and isopropyl
is a good solvent for it. Glycerine, too, should work.
 
DeOxit formulations DO enhance contact, it's worth applying after cleaning.
"Rod Speed" <rod.speed.aaa@gmail.com>: May 30 11:40AM +1000

micky <NONONOmisc07@fmguy.com> wrote
 
> but comelete with owners manual and remote control.

> The remote works fine except for the buttons used the most,
> volume up and down, channel up and down, power, and muting.
 
That's pretty common with older remotes.

> I took it apart and expected to find oxidized contact points,
 
They are normally gold plated so don't oxidise.
 
> but no. Instead those buttons, on the circuit board
> and on the buttons, are shiny and a little bit sticky.
 
Likely someone managed to spill something on the remote.
 
> I forced myself to taste it, but I don't taste anything.
 
Likely because it has been there a while.

> 3 other buttons have a little of those,
> but no more than 4% of any button.

> What is this, how does it get in there,
 
Likely someone spilt something on the remote.
 
> and [what do I do about it}?
 
Wash it off.

> I have DeoxitIT, what I've read is the best, but I guess I've
> never used it before, and it didn't remove the stickiness.
 
Not surprising that it didn't.
 
> prevent oxidization, so I switched to isopropyl
> alcohol and that did a good job.

> So I know what to do about it, but what is that stuff? Finger oil?
 
More likely spilled drink. Finger oil isnt sticky.
micky <NONONOmisc07@fmguy.com>: May 30 01:10AM -0400

In alt.home.repair, on Sun, 30 May 2021 11:40:21 +1000, "Rod Speed"
 
>That's pretty common with older remotes.
 
>> I took it apart and expected to find oxidized contact points,
 
>They are normally gold plated so don't oxidise.
 
They weren't that either. Everything was black, but not solid black.
Lines in some pattern that filled the cirular area that matched the
button.
>> and on the buttons, are shiny and a little bit sticky.
 
>Likely someone managed to spill something on the remote.
 
>> I forced myself to taste it, but I don't taste anything.
 
I didn't like tasting it, expecially since I was sick two nights ago but
I figured a little bit couldn't kill me. The guy who gave it to me
seems like a very clean guy!
 
>Likely someone spilt something on the remote.
 
>> and [what do I do about it}?
 
>Wash it off.
 
I went back and put that in brackets after I figrued out what to do. ;-0
 
>> I have DeoxitIT, what I've read is the best, but I guess I've
>> never used it before, and it didn't remove the stickiness.
 
>Not surprising that it didn't.
 
Before I took it apart, I figured DeoxitIT was what it needed, and I was
a slow to change plans.
 
But as to something spilled on it, I don't see how that could be since
the buttons affected were at 4 corners of the remote with lots of
buttons in between, unblemished rows and columns in between.
 
Only the controls people use a lot, plus Mute, were dirty. It must
have to do with normal use.
 
Andy Burns <usenet@andyburns.uk>: May 30 06:43AM +0100

micky wrote:
 
> what is that stuff? Finger oil?
 
I've always assumed so, combined with whatever gets spilled on remotes,
I'd never taste my own remote juice, let alone someone else's, yesh
alcohol usually works (vodka if necessary and doing it for a favour when
away from home)
"Rod Speed" <rod.speed.aaa@gmail.com>: May 30 05:11PM +1000

micky <NONONOmisc07@fmguy.com> wrote
>> micky <NONONOmisc07@fmguy.com> wrote
 
>>> Someone on Freecycle gave me a nice tv, pretty old,
>>> but comelete with owners manual and remote control.
 
Whats the brand and model ?
 
 
> They weren't that either. Everything was black, but not solid black.
 
> Lines in some pattern that filled the cirular area that matched the
> button.
 
That's normal, the button end that touches those electrically
connects those lines. They should be two separate electrically
separate lines, usually each set joined at one end of each set
with the lines interspersed
 
 
>> Likely someone managed to spill something on the remote.
 
>>> I forced myself to taste it, but I don't taste anything.
 
> I didn't like tasting it,
 
Yeah, specially if the previous owner had been into the porn channels.
 
 
> But as to something spilled on it, I don't see how that could be since
> the buttons affected were at 4 corners of the remote with lots of
> buttons in between, unblemished rows and columns in between.
 
It might well be that that proves it was a spill because the
rubber buttons are usually in a mat and the spilled liquid
could only get around the corners of the mat.
 
> Only the controls people use a lot, plus Mute, were dirty.
> It must have to do with normal use.
 
Not necessarily with the buttons on the corners.
 
But its possible it is plasticiser out of the buttons.
 
>>> alcohol and that did a good job.
 
>>> So I know what to do about it, but what is that stuff? Finger oil?
 
>> More likely spilled drink. Finger oil isnt sticky.
 
But plasticiser can be.
Peeler <trolltrap@valid.invalid>: May 30 10:23AM +0200

On Sun, 30 May 2021 11:40:21 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:
 
<FLUSH the trolling senile asshole's latest trollshit>
 
--
Richard addressing senile Rodent Speed:
"Shit you're thick/pathetic excuse for a troll."
MID: <ogoa38$pul$1@news.mixmin.net>
Unlisted <unlisted@nomail.com>: May 29 10:38PM -0500

I have a Radio Shack SSM-1750 mixer. The primary winding of the power
transformer is open. The secondary has two windings. One is blue-black
blue (centertap). That feeds power thru a bridge rectifier to the whole
unit. The other windings are two brown wires that go to a diode and cap.
All that does is feed power for an optional panel light.
 
But I cant find any schematics online. I spent hours looking. Just
owners manuals that are pretty useless.
 
 
So I dont know what voltaqe transformer is needed for the main CT
secondary. (The light one I can live without)
 
A sticker on the trans reads. 059-154.
 
Its a nice mixer. Id like to fix it. Can anyone help?
 
WHATEVER HAPPENED TO ALL THE RADIO SHACK ONLINE MANUALS? ARENT THEY
ARCHIVED SOMEWHERE?
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