is there a guideline for disassembling a HP-35s ?

[Jehag]

Hi.

I'm new here, and I'm here because I got an old HP-35s.
However, the buttons don't work well. I saw an interesting thread on (almost!) submerging the whole thing in alcohol.
The thread is called: [HP-35s] Are bad keys fixable?

But in that thread the 35s was disassembled to help the drying process. Now, I want to try the alcohol remedy too, but I hesitate to disassemble the thing. I have already screwed up one before. Is there some guideline how to open a 35s?

Thanks.

[Maximilian Hohmann]

Hello!

(10-29-2023 09:00 AM)Jehag Wrote:  Is there some guideline how to open a 35s?

In this thread you can find a textual descripton of the disassembly, unfortunately some pictures have evaporated over the years: https://www.hpmuseum.org/cgi-sys/cgiwrap...ead=118409
And here are some internal views of the calculator including a picture that shows the location of the six screws that need to be undone to open the housing: http://www.finetune.co.jp/~lyuka/interests/calc/hp35s/ Once the calculator is open, you "only" have to remove about two dozen more screws to gain access to the keyboard. Which is an enormous advantage over previous HP calculators which had their keyboards permanently attached with heatstakes.

Hope that helps!
Max