HP 9825 keyboard restoration

[jebem]

Back in the late 70's we use to repair these keys by cleaning it on Wang Computer equipment at our customer sites.

First immersing them in isopropyl alcohol and shaking them for a minute or so, then let it dry for a few minutes and apply a good quality dry contact cleaner (with no oil) commonly found in electronics shops.

Test it with a ohmeter for zero ohm before reassembling.