HP Forum Archive 07

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Cleaning an HP 27S Message #1 Posted by Jimmy P. on 25 Nov 2001, 12:12 a.m. I have a friend who owns an HP 27s. She unfortunately spilled pineapple juice on it, and the calculator stopped working. Any recommendations on how to clean it? (While it is now dried, it remains sticky, and this got under the keys also). One idea was to remove the batteries and keep it immersed in water for a period of time, and then let it dry completely. I assume there is no way to open the calculator up to clean it. Any suggestions would be greatly appreciated.

Re: Cleaning an HP 27S Message #2 Posted by Vieira, Luiz C. (Brazil) on 25 Nov 2001, 1:39 a.m., in response to message #1 by Jimmy P. Hello; PLease, have a look here and here, where opening an HP42S is described in details. The HP42S and the HP27S share the same case (Pioneer series) and opening both means following the same procedure. About immersing the calculator in water: I cannot find reasons against, cause I had to immerse many electronic equipment in water so durty would be easily removed. What worries me about immersing a Pioneer (and any calc) is the keyboard assy. I`d be concerned about integrity. PLease, wait for other posts so other contributors will help you more precisely. Cheers.

Re: Cleaning an HP 27S Message #3 Posted by Jimmy P. on 25 Nov 2001, 2:10 a.m., in response to message #2 by Vieira, Luiz C. (Brazil) Thanks for the advice. I have taken a look at the postings that describe how to take the calculator apart. I'd rather try a non-destructive approach before drilling into the plastic. That's why I'm thinking of the water immersion idea, unless there are parts that will be affected by (distilled) water.

Re: Cleaning an HP 27S Message #4 Posted by Julián Miranda (Spain) on 25 Nov 2001, 7:51 a.m., in response to message #2 by Vieira, Luiz C. (Brazil) The HP 27S has a beeper, not all Pioneers have. I don't know if water will afect it but sure there are people in this forum who knows.

Re: Cleaning an HP 27S Message #5 Posted by David Smith on 25 Nov 2001, 4:10 p.m., in response to message #4 by Julián Miranda (Spain) The beeper disk is a brass disk with a ceramic coating... water should not hurt it at all. I have had occasion to use imersion in an ultrasonic cleaner on a few calculators. They all seem to have survived... although it did not fix all of them, it worked on many and none came out worse than they went in. I have never done a 42S (though I have one that I am thinking about). If you do drown your machine, use three separate changes of distilled water. I have used Kodak PhotoFlo wetting agent in the last rinse to help prevent streaking of the display window. I have also dried them overnight in an oven on LOW (mine is less than 140 degrees). These techniques are only recommended for machines that would otherwise wind up as scrap.

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