TEXAS TI-59

For many, the best calculator in the 70's. Powerful and low cost made it so popular.


Card Reader.

Power adapter / Charger
Model AC 9900/H  6.2VAC / 200mA / 3VA

Replacement Battery - wrong type, soldered to the calculator, and dead

 

After cleaning

Documentation

Read Heads signal:

Keyboard replacment:

Initial testing:
Three jumpers are needed in order to a successful power On.
On the 8-pin female connector, from left to right in the picture:
- Connect together the 2nd, 3rd and 4th pins (power on switch);
- Connect the 5th and the 8th pins (card reader sensor);
- Connect the 6th and the 7th pins (card reader sensor).

Repairing the battery connector::

Assembling:

Final testing: