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ADB Keyboard turning machine on automatically?

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I noticed that my machine comes on by itself sometimes. Not knowing how it was happening, I narrowed it down to my ADB keyboard. I'm running an extension wire with it too, just for more info. But I noticed that after it coming on by itself a few times, every time I hit the Shut Down command the thing IMMEDIATELY turns back on like it's restarting. I know it's ADB related because when I unplugged the ADB cable the problem went away. As soon as I leave the ADB cable plugged back in it starts happening again.

 

How can I fix this?

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Maybe I should take the keyboard apart and look at the power button. Not sure exactly what to look for though. If I absolutely have to, I'll just disconnect the power button altogether, but I'd rather fix it if I can.

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Do you have another soft-power machine you could try that keyboard with?  To rule out if there’s something wonky with the unique pairing of that keyboard with that machine?

 

Reminds me of this one 1984-style mouse I had that would always reboot ONE (only one) of my Mac Pluses whenever I plugged it in if the Mac was already running.  Happened 100% of the time.  Never happened with any other mouse, or with any other Mac.  I finally decided something must be shorted out inside the mouse, and recapped the mouse (who recaps a mouse?) ... still kept happening, unresolved to this day.

 

If it’s really the keyboard, I assume something in shorted out in there somehow and you may need to look at cleaning the board and/or recapping it?  I assume the keyboard works OK otherwise?  For example, every key works in Key Caps?

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Very late reply, I forgot about this. I hooked the keyboard in question to another machine and the same thing happens. The entire keyboard works fine, minus it turning on all the machines automatically.

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I'm still at a loss at how to fix this. It's definitely that one keyboard. It does it with every machine I connect it to, and it stops once I unplug it. The culprit is an Apple Extended II keyboard, my best one. There's gotta be something I can do to fix this.

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Well some quality photos of the mainboard of the keyboard would be useful for those here with eagle eyes and who know what to look for.

Hopefully it will simply be a case of having to recap the board and nothing serious like damaged traces.

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Luckily the power key is isolated from the rest of the keyboard circuit wise. I would suspect the mechanism itself is dirty. You can try putting some contact cleaner on it to see if that helps. You need to check continuity across the bottom of the board to trace the problem. It's been a while since I've been inside one, but I think it's just a key and resistor connected across ground?

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I sprayed some Deoxit in it and it seems to not be turning on the machine, so far. I should've done this months ago but I never did trust spraying any Deoxit in there. I did though, so I'll keep it plugged in and see if it acts up again.

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