Hi Pentiumbil.
I will be glad to assist you.
The issue you are experiencing, may be caused by an overflow error or low voltage power. Please press the [RESET] button on the bottom of the calculator and perform a printed calculation. If the error persists, I recommend changing the batteries, or, if you're using an AC adapter, plugging the unit into an outlet on an opposite wall.
If the error persists, or you would still like a manual for the calculator, please contact our Calculators Email Technical Support Group at the link below:
Contact Us - Support By Email
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