HP Forum Archive 15

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HP 15C Keyboard Message #1 Posted by Charles on 8 Mar 2006, 5:19 p.m. I have an HP 15C which passes all the tests but the 9 key sometimes doesn't register or puts 2 nines in the display. I'm reluctant to open it up but would consider it. Does anyone have any suggestions ? Thanks

Re: HP 15C Keyboard Message #2 Posted by Randy on 8 Mar 2006, 8:12 p.m., in response to message #1 by Charles If the key clicks okay and has the normal travel, it should be fine. This is an adaptation from many posts from MoHPC regular David Smith: "Your most likely problem is a dirty switch contact for the 9 key. These can be cleaned fairly easily if you open up the machine (one screw under each rubber foot). Beneath each key dome is a tiny hole in the circuit board. Make a tiny wire brush out of three wire brush bristles twised together, mounted in a pin vise, and trimmed square. Place a drop of 91% isopropyl alcohol on the hole, dip the wire brush in more alcohol, and gently "scritch" around in the hole with the brush. In stubborn cases you may have to repeat a few times." For more on how to open: http://www.hpmuseum.org/disasm.htm Good luck, post again if you need more help.

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