Although not ideal, the shield can be connected to ground without
issue. D+, D-, and Vcc should all be completely isolated. You can look
up the specs and figure out which pin is what, based on your connector
type.
On Mon, Sep 14, 2009 at 5:12 AM, Pete Theisen <petetheisen@verizon.net> wrote:
> Pete Theisen wrote:
>>
>> Eben King wrote:
>>
>>>>>> I ran a screw through a brand new USB 2 cable, long story. Exploratory
>>>>>> surgery reveals that the insulation is penetrated and maybe half of the
>>>>>> shield wires are broken, but the copper wire and the aluminum wrapped
>>>>>> thingie are untouched.
>>>>>>
>>>>>> Is it shot or not? If it was a shielded audio or TV cable I would just
>>>>>> tape it up and not worry about it but I don't know a lot about USB.
>>>>>
>>>>> There are (up to) four conductors, two for power and two for signal.
>>>>> The shielding's probably to keep the signal from leaking out and other RF
>>>>> noise from leaking in. If the wires are intact I'd just tape it up
>>>>> (preferably with some nonconductive tape, but you're only talking about
>>>>> 500mA @ 5V) and use it like normal, but don't put too much stress on that
>>>>> part of the cable.
>>>>
>>>> Thanks, I think I'll do that right now.
>>>>
>>>> I wrapped it with some aluminum AC tape first to replace the shield, now
>>>> non-conductive tape over that. If my keyboard and mouse both start getting
>>>> flaky at once I will know why.
>>>
>>> Uh, wait, what? Highly conductive things next to possibly-frayed wire is
>>> a no-no. If you must use Al tape, use something else inside it.
>>
>> Hi Eben,
>>
>> Only the shield is frayed, I thought I could repair the shield. On the
>> other hand, I have a Sperry SP-5A multimeter, is there a way to check if
>> everything is OK?
>
> Testing now . . . done.
>
> I would expect the wires to test continuous with themselves, isolated from
> each other and isolated from the ground. I would expect the shield to test
> continuous with itself and isolated from the wires. This is the case. Am I
> home free?
>
> --
> Regards,
>
> Pete
> http://pete-theisen.com/
> http://elect-pete-theisen.com/
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