![]() ![]() ![]() Doing this it will not delete the programs you have on the Casio, and I guess with this it would be enough to solve your problem. To solve your problem, with the calculator turned on, push with a needle, the hole placed back, where the letter “P”. Once you are done with one, you can change the other. Then you have to change just a battery, the big ones or the small ones, not the three at the same time. You have these different batteries to have a backup battery when changing, not to lose your information. The calculator has 2 big batteries (CR2032) that are the ones that make the calculator work, and a small one (CR1220) which is the one that saves the memory when the battery is changed. First of all, I tell you how you should have changed the batteries in case you have not done it yet, to make you know by the next time. ![]() That problem is very common and easy to solve. Message: I cannot make the calculator work after changing the batteries, the TM, SN error codes appear, and nothing works. I got an email of someone whoes calculator Casio 880 is having troubles after changing the batteries, as it is a very common failure on Casio FX-880P and FX-850P, I write here the question and the solution. ![]()
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