Re: weird reboots of embedded pc
From: Vlad (Bla_at_dot.com)
Date: 12/13/04
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Date: Sun, 12 Dec 2004 19:52:50 -0500
On Fri, 10 Dec 2004 12:32:03 +0200, "Quack" <alex+google@vuetec.com>
wrote:
>Hi,
>
>This is a verry strange one :)
>
>The system;
>A large cabinet (casino slot machine) - made of wood.
>-1 x standard pc motherboard (p4 1.5ghz)
>-1 x standard ide disk
>-1 x 17" flat panel with resistive touchscreen/usb controlled
>-1 x key operated switch, connected to the CDS line of the serial port
>
>The problem;
>If someone with a slight static charge touches the key to the keyswitch - it
>sometimes hard boots. As if the power was cycled.
>
>We tried changing power supplies.
>We tried grounding everything, including the keyswitch.
>We tried with everything except power disconnected from the motherboard,
>still happens.
>(thats right, everything disconnected, including the keyswitch!)
>
>It still happens, even when the keyswitch is completely disconnected - the
>keyswitch is also mounted in wood so makes absolutely no connection
>anywhere - but for some reason, touching it can reboot the machine.. wow.
>
>Also, there are 10 machines, all worked fine for 3 months - this problem
>just 'started' one day - on all 10 machines. So we assumed an external
>influence caused it.
>
>So, we replace all motherboards with a different brand - the problem
>disappeared.
>We added a regulator to feed a UPS for _each_ machine.
>
>This ran for a few weeks - and now the problem has returned. Wow - how
>weird!.
>
>any ideas ? this is killing me.
>
>Alex.
>
Wireless devices like keyboards and mice are not reliable around
airports.
Once I install a radio station that had a power voltage regulator that
behaved in a very strange way. With the transmitter connected to the
dummy load everything was fine, Filtering the line that fed the
control circuit, fixed the problem.
Vlad
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