HP-21 Disassembly Help...

[Geoff Quickfall]

Good news, you have holes.

Now to get in. Not a hinge but a slot receiving a tab.

Watch this video:

https://ca.video.search.yahoo.com/video/...=ipad&tt=b

1) Remove battery pack.
2) remove two screws located under rubber feet at top of calculator.
3) as pictured, separate the upper portion pivoting on the lower section.
4) as you pivot, notice the battery contacts are preventing you from separating the two halves.
5) push gently on the contacts in a Motion to clear the battery compartment.
6) voila!

Now take some deoxit red and apply some to the hole under the offending key. Work a fine wire into the hole and twirl it as Katie mentioned. Work the key numerous times. Assemble is the reverse making sure the contacts clear the battery compartment.

Looks like steps one through three are complete, just ensure the contacts clear the compartment, as this is where the hangup is.

There is a trick which the HP people use but that takes even longer to describe but is pictured in the video.

Geoff