HP41CV Repair - Keyboard PCB Reassembly

[Dave Britten]

(05-24-2021 01:50 PM)BillBee Wrote:  For a 15c, which also used the plastic rivets, I clamped the keyboard tight and used a "dab" of E6000 jewelry glue on each spot. No problems so far. Nice and tight key presses.

In my case the calc came that way. For your case there are other options. I have read (on this site) use of an ultrasonic cleaner and/or a keyboard bath (vinegar soln IIRC). Though I recommend some reading for confirmation.

For specific keys I have used DeOxit and a small wire to fix intermittent 41c keys. Be gentle.

Hope that helps until some pros pop by.

-Bill

I did something similar to fix a TI FIA with dirty key contacts. That thing has enough heat stakes to make an HP 28 blush. Place the calculator face down on a board, and use Irwin clamps to hold the PCB in place. I used JB Weld Plastic Bonder so it took about 24 hours of gluing some stakes, waiting a couple hours for the epoxy to cure, moving the clamps, gluing more stakes... Might have to try E6000 and see if it's a quicker process.