HP-21 Disassembly Help...

[PANAMATIK]

I want to share my experience of cleaning a woodstock keyboard by completely removing the heat stakes.

After removing the top of the heatstakes with a scalpel I could separate the parts from each other and easily clean the keyboard contacts.

I decided to use a two component adhesive to fix the heatstakes. The bureau clips shown in the picture below were very helpful during hardening. It is very important that the parts must be as close together as before.

Be careful not to put any adhesive into he holes of the buttons

After applying the adhesive to the points indicated by the green arrows, I turned the keyboard around with the buttons upside laying on the table to avoid that any adhesive could flow by gravity through the holes into the keyboard. I didn't fix the heatstakes in the center of the keyboard for the same reason to avoid unwanted adhesive coming to near to the button contacts.







After cleaning the contacts, all buttons are working now flawlessly. The keyboard seems stable and I hope it will keep to be fixed for long time.

Bernhard