Re: HP 32Sii - How do you open it for cleaning? Message #2 Posted by Randy Sloyer on 30 June 2003, 7:35 p.m., in response to message #1 by Kent Harbert
Opening the back will bring you no closer to the problem. The keyboard is sealed. The only effective method is to clean in distilled water in an ultrasonic cleaner. But having said that, this is a conditional solution. This applies only if the problem is random keys, usually the enter or a numeric key. Happens most often when the unit is used outdoors in dirt, i.e. Surveying.
If the problem is one or more columns or rows of keys that are non-responsive, cleaning will not solve the problem. In this case, the keyboard has lost contact with the logic board. Instructions for opening the unit can be found here: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=5
You'll find the problem to be the mylar of the keyboard and foam backing pad. The mylar is going one direction, the pad is to push against. The pad has lost it's spring tension and no longer holds the mylar connector against the logic board. Shimming the pad is the easiest solution.
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