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Full Version: HP 28 with battery corrosion
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A friend of mine has gotten battery acid in his HP-28 (forgot the batteries in the calc for just too long) . And it´s just dead when using new batteries. Is there a way to rescues the calc? How can it be opened?

If the corrosion isn't too bad, try spraying deoxyit on the contacts.

Opening a 28 is painful -- welded heat stacks need drilling and replacing.

Agree with Paul!

Try deoxit and some mechanical cleaning with a stiff artist brush that fits into the battery compartment.

Work the brush into the compartment first, shake any debris out, repeat many times. Then introduce a drop deoxit onto a brush and paint the springs with it.


try this :-)

Read the whole posting: Shucking the clam shell
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