LK201 key stuck

From: Charles H. Dickman <chd_1_at_nktelco.net>
Date: Tue Oct 7 18:33:29 2003

I have been working on a DEC Pro 380 and the LK201 keyboard I have
causes the Pro to report a stuck key and hang. So I opened up the
keyboard thinking I could clean out whatever had jammed in there.

Looking at it, I don't quite know how this thing works. Each key is
supported by a "cantilever" spring. This spring has a piece that looks
like it has a contact of some sort, but this is all on top of a layer of
rubber and it doesn't even look like the "contact" touches the rubber.
Below the rubber is a piece of clear, flexible plastic with circuits on it.

So does anybody know how this thing works? Contacts? Capacitive?
Inductive? Has anybody ever fixed one?

-chuck
Received on Tue Oct 07 2003 - 18:33:29 BST