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HP71B soft case - Printable Version

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HP71B soft case - John Pierce - 10-11-2007

I have a problem with the case that came with an HP71B I recently bought. According to the s/n of the calculator it was made in 1988 and appears to have been stored unused for most of that time. The interior black lining of the case has a "sticky" substance which also deposited on the calculator. It easily wiped off the calculator using isopropyl alcohol. Does anyone have experience with this, or know if the interior of the case is deteriorating and what can do about it?

Re: HP71B soft case - Allen - 10-11-2007

Some have said that a gentle cycle in the laundry would help (otherwise wash with warm soap and water) I have seen a hand full of cases with the same condition, both for the 71B and the 41C, but I have not tried the recommended cleaning method. Please let me know if it works.

Re: HP71B soft case - Massimo Gnerucci (Italy) - 10-11-2007

It works. I tried on some 41C and 71B cases and it did magic. Just don't use hot water or they will become a little "dull".


Re: HP71B soft case - John Pierce - 10-11-2007

Thanks to both for your responses. The soft case was washed with outstanding results and has survived with no damage at all, after thorough air drying it looks nearly normal. The only difference I notice is the naugahide(sp) appears "dried" out; I'll try Armoral. My concern now is that this condition not return and contaminate the calculator. Thanks.