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Dave Britten · 10-04-2022, 04:56 PM

(09-30-2022 08:41 AM)luke7110 Wrote: Hi, I also bought this calculator, this was my first serious calculator when I was kid ?
Good cosmetic condition but sold as non working for cheap.
The only electrolytic capacitor leaked a bit, I swapped it and had to repair a corroded track in the area. It now turns on and at first I though I repaired it, cause I can type and screen looks ok, but I just can't calculate. If I try a "1+1 EXE" screen goes blank with just a - in the lower right corner.
Same if I try to call a formula ex "1 FMLA".
I reflowed and cleaned all the joints, but it didn't improve the situation.
I guess main CPU is OK and the problem is coming from RAM ?
After reading all the posts and understanding that a ROM is in-between CPU and RAM, (+ formulas are stored inside the ROM), could it be the ROM instead of RAM?
Still, I guess RAM are more prone to fail.

Any thoughts ?

Have you pressed the Reset button on the back with the calculator turned on? Older Casios usually don't have automatic initialization of memory, and can act a bit goofy if you don't reset them after installing batteries.