Insulated wires in headphones lead?

[David Gould]

Firstly, thanks to the two guys who helped me with the printer problem -
I've yet to secure any cleaning alcohol but I'm sure that's it.

Secondly, I'm almost embarrassed to ask this one:

I tripped over my Sony CD350 headphones, which went dead. The jack plug
was bent so I cut it off and stripped down to 4 wires (2 ground & L/R).
The problem is that none of them seem to conduct - even at a 1 mm
distance (using a digital multimeter).

The only thing I can think is that they're somehow coated although the
wires are incredibly thin and wrapped around individual cores.

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.

 

[Jerry G.]

Before soldering these wires, the ends have to have the coating burned off.
I use a small flame for this, as like from a cigarette lighter, and then
scrape off the carbon with a very fine abrasive. I then solder-tin the ends,
and then trim the end back to the length I want. I then can solder on the
new connector.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"David Gould" <dave@deep-tranceNOSPAM.com> wrote in message
news:kgkc705dltuvbnftn66tu6ft8dfv65trdb@4ax.com...
Firstly, thanks to the two guys who helped me with the printer problem -
I've yet to secure any cleaning alcohol but I'm sure that's it.

Secondly, I'm almost embarrassed to ask this one:

I tripped over my Sony CD350 headphones, which went dead. The jack plug
was bent so I cut it off and stripped down to 4 wires (2 ground & L/R).
The problem is that none of them seem to conduct - even at a 1 mm
distance (using a digital multimeter).

The only thing I can think is that they're somehow coated although the
wires are incredibly thin and wrapped around individual cores.

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.

 

[gothika]

On Fri, 09 Apr 2004 07:39:14 GMT, David Gould
<dave@deep-tranceNOSPAM.com> wrote:

Firstly, thanks to the two guys who helped me with the printer problem -
I've yet to secure any cleaning alcohol but I'm sure that's it.

Secondly, I'm almost embarrassed to ask this one:

I tripped over my Sony CD350 headphones, which went dead. The jack plug
was bent so I cut it off and stripped down to 4 wires (2 ground & L/R).
The problem is that none of them seem to conduct - even at a 1 mm
distance (using a digital multimeter).

The only thing I can think is that they're somehow coated although the
wires are incredibly thin and wrapped around individual cores.

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.

How are you testing the conductivity? Continuity check
perhaps?(presumtive on testing at both end of the leads?)
In my experience Sony headphone leads are very fragile and prone to
breaks if stretched.
Mainly because of the very fine gauge of the lead wire used.
If you tripped over the cable better check the connection at the
headphone element end.
If you don't get continuity on all the leads you'll have to replace
the cable.
I use sennheiser pro cables on all my headphones that see serious
duty.( you'll have to cut the special sennheiser connectors off the
headphone end of the cable and solder to the elements using a low watt
soldering iron.)
Sennheiser cables use steel stranded wire in their cables making them
very tough to damage.

 

[David Gould]

On Fri, 9 Apr 2004 07:17:42 -0400, "Jerry G." <jerryg50@hotmail.com>
wrote:

Before soldering these wires, the ends have to have the coating burned off.
I use a small flame for this, as like from a cigarette lighter,

Ah, I did this...

and then scrape off the carbon with a very fine abrasive.

But not this until now I used Maplin's PCB cleaner too.

I then solder-tin the ends,
and then trim the end back to the length I want. I then can solder on the
new connector.

OK, did this, though forgot to allow for the shielding... <sigh>

However, there is still no sound in either ear. Seems unlikely I'd have
broken them both and the source _seems_ fine: the PD between the Right
and the Ground seems to vary +/- 1 V at full volume (deafening). But 0V
between Left and Ground.

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.

 

[David Gould]

On Sat, 10 Apr 2004 01:45:18 -0500, gothika <Vampyres@nettaxi.com>
wrote:

How are you testing the conductivity? Continuity check
perhaps?(presumtive on testing at both end of the leads?)

The whole thing was sealed. I had to cut away at the jack end.

In my experience Sony headphone leads are very fragile and prone to
breaks if stretched.
Mainly because of the very fine gauge of the lead wire used.
If you tripped over the cable better check the connection at the
headphone element end.

There are 2 independent pairs, I thought at least 1 would be intact
<sigh>

I think that's the next job.

If you don't get continuity on all the leads you'll have to replace
the cable.
I use sennheiser pro cables on all my headphones that see serious
duty.( you'll have to cut the special sennheiser connectors off the
headphone end of the cable and solder to the elements using a low watt
soldering iron.)
Sennheiser cables use steel stranded wire in their cables making them
very tough to damage.

Thanks.

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.

 

[David Gould]

On Mon, 12 Apr 2004 21:48:36 GMT, David Gould
<dave@deep-tranceNOSPAM.com> wrote:

On Sat, 10 Apr 2004 01:45:18 -0500, gothika <Vampyres@nettaxi.com
wrote:

How are you testing the conductivity? Continuity check
perhaps?(presumtive on testing at both end of the leads?)

The whole thing was sealed. I had to cut away at the jack end.

OK, having removed the padding, I could unscrew the headphone covers.
So I replaced the cable, but in soldering at the speakers, I screwed up
the existing connections.

There's a row of blobs of solder, with the wires connected at either
end. In the middle of the row, there's a blob of blue plastic stuff.

There seemed to be a small resistance across this row, something like 8
Ohms. I'm not sure if this was due to the blue stuff, something
underneath the blue stuff or the connections to the loudspeakers.

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.

 

[David Gould]

Headphones are described here if it helps:

http://www.electronicusmaximus.com/172541_PRODUCT/PRODB00001WBRE_SonyMDRC.html

Dave, http://www.deep-trance.com
Guaranteed changework in Bristol, UK

Latest newsletter: Maximising your Persuasiveness with Sleight-of-Mouth.