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?
Regards,
Matti
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.
Pauli
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.
OR
try this :-)
Read the whole posting:
Shucking the clam shell