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+--- Forum: General Forum (/forum-4.html)
+--- Thread: HP41CV Key Issue (/thread-14605.html)
HP41CV Key Issue - dluvhike - 03-04-2020 11:34 PM
I have searched for an answer to this with no luck. Appreciate the forum helping out.
I have a key on my HP41CV (that I bought in 1986) that feels fine but does not register until I press it hard. Is there any easy fix to this?
RE: HP41CV Key Issue - g8241CV - 03-05-2020 05:45 AM
Lot's of threads on the topic. Deoxit is your friend. Example:
https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=217869
Look for other threads on opening/closing the calculator, here and on other sites, to avoid damaging the battery posts.
RE: HP41CV Key Issue - Dave Britten - 03-05-2020 12:52 PM
https://www.amazon.com/CAIG-LABORATORIES-D100L-25C-Contact-Cleaner/dp/B0000YH6F8
Use the precision tip to put a tiny drop into the hole underneath the key, and press the key a few times to work the liquid into the contact. The key might feel/sound a little different for a few days, but should be back to normal after it's dried out a bit. The response of the key will be improved almost immediately. This also works great on Woodstocks, and possibly other models.
Just be very careful of the screw posts on the 41 when opening the back of the case. It wouldn't be a bad idea to have some JB Weld Plastic Bonder handy in case you need it, and don't be surprised if you have to do a lot of cleaning on the various pressure contacts to keep the calculator behaving like it should after reassembly. My 41CV fullnut was varying degrees of dead/glitchy, and it took several attempts at reopening it and cleaning contacts to get it back to normal.