HP31E Missing Pin

[teenix]

(03-17-2021 09:56 AM)PANAMATIK Wrote:  

(03-16-2021 03:32 AM)teenix Wrote:  Hi all,

I removed the pin 8 connection again and put a dap of epoxy on the chip where I Dremmelled the plastic away to protect it against moisture ingress.

I repaired the corroded and broken battery ribbon and what do you know, it sprang back to life :-)

cheers

Tony

Does it work without the chip? In this case moisture protection is not really necessary?

Bernhard

I don't know Bernhard, I didn't try. It's not my calculator so best I leave it as is and with the ribbon setup, I think the less handling the better.

It is quite odd that the chip is there in the first place. There are markings under the "paint" on the top surface but I cannot make them out. I couldn't imagine HP just putting them for no reason, and they would have been reasonably expensive in the day.

cheers

Tony