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tlfrance · (This post was last modified: 12-20-2023 05:05 PM by tlfrance.)

Hello hpmuseum guys

I encounter some issues on my HP28S calc. Batteries are new *

1/ On autotest mode, result is : "2 FAIL"
2/ The screen do reset (clear) after i enter more than 2 or 3 lines in the stack
3/ when trying to plot sin(x) for ex, just 2 first dots begin plotting then cacl seems to be freezed. Must interrupt process whith "ON + UP"

Maybe issue can be the RAM chip , but not sure. What do you think about ?

Thanks for help.