HP97 battery pack rebuild

[Jlouis]

Just a follow up of this thread:

I received the HP97, with the case (mint) and the HP original AC charger (bad condition, already repaired, but working, 13v AC without connect and 8v AC after conected to the calculator).

The calculator is extremely dirty, I will clean it later, as the will to turn the beauty on is huge.

It's Made In Brazil, year 1978.

It did not work with the ac charge pluged in (exausted battery pack on). It was erratic, sometimes on, most of the time off. As my sub C batteries have not arrived yet, I managed to plug four rechargeables AA bateries using an adapter and alligator connectors...and... it worked!

Batteries are total of 5.13v, so I think this is a good voltage.

Printer is dead so the card reader. Funny thing is when I turn it on, there is a buzz noise, like a little dc motor running, I suspect it is the card reader motor. I don't think it is normal, I'm gonna check the service manual, but if some of you have a clue of what is going on, I will apreciate.

Keys are working, but sometimes they double or triple the number keyed! But if my keystroke is fast, it is normal.

I tried to remove the case, but the screws were stuck. I sprayed just a little of lub. I'll try to remove it later. I think this calculator has never been opened before.

I'm amazed of the crisp, bright and BIG display!!! What a pleasure!!!

Well, I supose that I will be busy for the next weeks!!

Cheers

JL

P.S.: Sorry for my bad english