Q
Quack
- Jan 1, 1970
- 0
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.
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.