HP-97 missing keys

[Duane Hess]

To answer the question can they be replaced, yes they can. Open the case, and remove the keyboard from the top case assembly. There is a HP-97 service manual on the museum here which describes the procedure along with key replacement.

It is not difficult, have removed keys myself, but a certain amount of manual dexterity is needed. Especially when you get to the "foils" which comprise a portion of the keyboard contacts. You do not want to bend them and should avoid touching contact surfaces.

You can replace keys by simple observation when you disasemble the 97. The 1st few times I have done such service manuals were unavailable to me. However, check the service manual, having a clue beforehand always helps.

Basically you separate the parts of the keyboard. Keys are held in place by "hats"; a retaining disk. In your case, as the top of the key is broken off, once you separate the keyboard the broken key stems should fall out. Insert a replacement key, spring and install the retaining "hat".