Re: FW: [SLE] Need help diagnosing hardware problem

On Tuesday 17 October 2006 21:41, Greg Wallace wrote:
.............
From what I just read in one of Felix's posts, you just stick the probe in
alongside the wire and don't need to unplug anything to get the readings.
At least that's the way I understood his post.

Greg Wallace

Greg,

it is not complicated when you see once, but from your other posts is clear
that you never did it before and it is kind of bad idea to start with power
supply that can give enough amps for quite strong sparks if you cross metal
tips on probes, and that can happen. So better call for help somebody that
did that before, and learn.

Text is not good medium to explain everything that one has to know for this
kind of troubleshooting. It is simply to much text for one posting:
- handling probes to avoid making short with tips, and many other incidents,
- how to get reading if surface is dirty without forcing the probe to slip in
wrong direction, shorting something; today normal probes are large comparing
to traces and electronic components and one can make short easily with single
tip,
- how to be sure that probe is measuring "no voltage", comparing to probe
touching wire insulator instead of contact tip which will give you the same
reading.
- proper voltage range selection, for cheap voltmeters without auto selection,
- to pay extra attention not to leave instrument on Amps and measure voltage,
which will fry something for sure, or on Ohms which will probably damage the
meter.
- to watch on static electricity that human body is loaded with, and that can
fry motherboard components without any sign that something happened,
- and so on ...

There is to much for the first time that one has to know, to make sure that
measuring will not produce more trouble that it can save from.

If you really want to do favor to yourself, skip testing for the first time
and ask someone for help, and learn.

--
Regards,
Rajko M.

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