Question about Casio DR-220HD Calculator
If you pry the buttons off and try to clean them, you may never get them back on properly.
The best thing is to take the battery out/ unplug it and then clean the keyboard with Isopropyl alcohol and a scrub brush. Let it dry overnight and hopefully the keys will function. If not, the unit may need to be replaced.
Posted on Sep 30, 2010
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Posted on Jan 02, 2017
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