HP-21 Disassembly Help...

[PANAMATIK]

(06-25-2020 07:25 AM)EdS2 Wrote:  Bernhard, many thanks for the photos and the update. Do I take it that 8 blobs of epoxy was not enough, and that you now used maybe 18 or 20 more blobs?

(I have an HP-25 which was disassembled before I got it, and I can't tell how many of the little plastic pillars would originally have had mushroom heads and be holding the keyboard together. Do all of them need reconstruction?)

Yes, as many heat stakes as possible should be fixed with epoxy, also in the middle part of the keyboard. If one or more are loose, when a button is pressed the keyboard PCB is not stable enough and deforms, this changes the click and feel of the inner buttons and makes them wobbly.


Bernhard