"Mycroft668" wrote in message
...
On Feb 28, 3:07 pm, Jeff Liebermann wrote:
On Tue, 28 Feb 2012 08:57:36 -0800 (PST), Mycroft668
wrote:
What is the purpose of the wire mesh and is the charger still usable?
Shielding to help the charger pass FCC Part 15 radiation tests. The
shielding keeps the RF inside the charger. Since you didn't bother to
supply the model number of the charger, I can only guess the reset.
Some Dell chargers use the shield as the ground wires (negative). If
it is a coaxial arrangement and there is a foil shield, the braid is
also used to hold the foil in place so that it doesn't tear when the
cable is bent.
If you broke the cable at the connector, you'll need to re-establish
continuity at the "wire mesh", also known as the braid or shield. If
there's a gap missing, wrap it in copper tape, and solder both ends.
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Thank you for the reply. I'm sorry I didn't give the model number of
the charger - I didn't know it mattered. Here are all the numbers
Model is Dell LA65NS0-00 and it also says PA-12 family. DP/N is
DF263 other numbers shown are PA-1650-06D3
The braid is broken too close to where it enters the charger for me to
be able to work with unless I open the charger and try to do some
major work from the inside but there are no obvious screws so that
wouldn't be worth it since I don't want to break the plastic case.
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
Of some significance is whether the braid screen encloses 2 or 3 insulated
wires, if its 3 the PSU has an earth if not its most likely "double
insulated" as they'd unlikely rely on the mechanical construction as the
sole means of earthing the appliance.
Check continuity from the exposed braid to the earth pin, if its connected
fine, if not your options would be limited by whether the plug is molded or
dismantleable.
If all it does is contain RF radiation from the mains lead, it shouldn't
have any bearing on the functionality of the PSU, but as someone else
mentioned it could interfere with other equipment - for example you may not
be able to listen to FM radio while charging the laptop.