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I realize this isn't strictly a computer-related question, but I figured that if there's any place to go for help about a broken keyboard, it would be a power users' forum.

The O key on my Unicomp Model M has the tendency to strike twice. In other words, I press the key once, and it sends out two letters. There is probably a mechanical solution to this, but I'm not familiar enough with how these things work to come up with a fix myself.

Has anyone had this problem?

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closed as too localized by Ƭᴇcʜιᴇ007, KronoS, Simon Sheehan, Journeyman Geek, 8088 Jul 20 '12 at 11:38

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Have you taken off the key, and tested by manually pressing the nub? –  soandos Apr 22 '12 at 15:34
    
Have you tried emailing Unicomp? –  paradroid Apr 22 '12 at 15:55
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1 Answer 1

On a model M, I would try removing the keycap (both the outer and inner keycap) and spraying a small amount of WD40 deep into the switch, then replacing the keycap and actuating the key a few dozen times in order to clean the contacts (I wouldn't try this on a keyboard without mechanical switches though).

Don't bother with the above advice regarding taking off the keycap and expecting to see a 'nub' there, model Ms don't work that way (removing the keycap exposes a spring that has to be pressed in a very specific oblique way to buckle the spring and tilt the top contact piece so it completes the circuit, it's not easy to actuate without the keycap in place).

Edit: it turns out that a model M has a rubber membrane between the switch and the contacts, through which the switch exerts pressure. Therefore the WD40 probably wouldn't reach the contacts if you apply it from above.

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Consider using a contact cleaner such as DeoxIT instead of WD-40; these are usually friendlier to electronics than a general-purpose lubricant such as WD-40. –  DragonLord Oct 22 '12 at 0:12
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