Osborne O1 Keyboard issues
dave at willomail.co.uk
Sun Aug 23 11:02:12 CDT 2015
On 23/08/2015 09:28, drlegendre . wrote:
> Howdy gents,
> Working away on the recently acquired Osborne 1. Seems there's something
> wrong with the KB - and if I didn't know better, I'd say it's a case of
> shorted contacts.
> The KB connector is 24 pins, double row header like a short floppy or IDE
> On the KB side, there are two "shorted" groups of pins. Group one is 2X
> shortred pins, group two is 5X shorted pins.
> Thing is, this KB is not really built to be serviced, best as I can tell.
> The switch matrix is made of two layered flexible circuits, and the key
> assys are 'riveted' in place, by melting over the plastic pins. So I see no
> way to disassemble it and give it a clean.. and then, even so.
> With such limited access, I don't see many avenues other than flushing with
> solvent(s) and hoping for the best.
> What's to be done? Is this one.. done already?
I had a similar issue on a Osborne a couple of weeks ago. I ended up
using a sharp knife to cut the melted pins on the rear of the keyboard
to remove the switches. Lifted the membrane and cleaned it before
refitting. To re-attach the switches, I used some super glue on the back
were each pin is and used a hot glue gun on the front in between each
Whole process took about an hour but has been working fine since. I
think this is caused by the cable constantly pressing down on the keys
when the keyboard is clipped to the front of the machine.
On an Osborne I repaired last year, just removing the the keyboard
assembly and giving a bit of a flex was enought to release the stuck key.
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