I just got two new calculators, and would appreciate your help.
1. 28S - Left keyboard has a full row and a full column of non-working keys. I don't have any idea on how to open the case, and web search did not produce any information. I am clueless. The calculator is in great shape, so I would like to keep its appearance, and fix it too (sort of eating the cake and keeping it...).
2. 33E - Old hardware version (no soldering on chips). Topmost small chip is missing pin number 8. My ideas are: a- cannibalize a for parts machine - i don't have one, so ....
b- recreate the pin - not so easy, as nothing is left from the original pin.
Any ideas ? I can probably fix it myself, but I am certain that this forum will help me do it the best way.
Greetings from Brazil.