On Tue, Apr 10, 2001 at 09:02 +0000, Declan Moriarty wrote:
> OK. Do it the scientific way: Set it going and see what gets hot. You
> have fairly sensitive infa red detectors on the ends of your fingers :-). This
> fault description raises the possibility of signal degradation; you may have
> something barely passing signals, then gradually going to the point where it
> doesn't do so acceptably;
>
> TTL voltage logic level limits for each line are:
> Less than 0.8Volts - definitely low
> Over 2 Volts - definitely high
> 0.8-2 Volts - indeterminate.
>
> As you see, you want to stay away from the 0.8-2Volts area. What happens is
> that at the very ends of the indeterminate area (0.9?V and 1.7-1.9V), things
> switch. Everywhere else in the indeterminate area, you retain the last valid
> value. Faulty hardware may drift in here, and stop switching when the lows
> don't go low enough or low fast enough, or the highs don't go high enough, or
> high fast enough. This is impractical to test, unless you have an oscilloscope,
> and great patience. But you can find what's doing it, and replace that
> hardware. Slow the system clock right down, and see if the problem persists -
> that will limit it to the laptop if it does.
Wow! This is getting very heavy for me. I'm just a guy for whom
electricity always was a very dubious thing: you can't see it, can't
smell or hear it and still it's there!
I just did the normal layman's thinking: Eliminate everything that
works and you get the thing that doesn't!
> In this scenario, I'd ask - What's in the other pcmcia socket? Does the network
> last longer with the other socket empty? It will be pretty obvious which chip
> is driving the sockets - does that get uncomfortably hot? Is the network
> putting extra load on the system and causing other heating? ELIMINATE things,
> and you'll solve it
The other socket is empty and (Yes) I tried the card in the other
socket with the same result. Concerning fingertips, I can feel that
the card when removed is fairly hot, hotter than a cpu with measured
55°C.
Anyway, after the easter eggs are all eaten I'll take the notebook to
someone who works at IBM. He'll run it through burn-in tests and
other nice things. After that I'll see what goes.
Thanks for helping!
wobo
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