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HP 20S Calculator - Resetting the Calculator
Sometimes a calculator locks up or will not respond correctly. The calculator might require a reset for a variety of reasons. The first reset will not affect the memory on the calculator. However, the other resets will erase the memory and restore the calculator's defaults. For this reason, it is important that you back up any critical data before resetting.
Resetting the calculator using the keyboard
To halt the calculator and reset the keyboard, follow the procedure below:
To completely reset the calculator and erase all user memory, follow the procedure below:
Resetting to drain the capacitor
If the above resets do not resolve the calculator issue, try one of the following resetting procedures.
If the calculator did not display the "ALL CLr" message after resetting, or if it did not correct the error, then remove the batteries for 24 to 48 hours.
NOTE: The batteries must be removed for at least 24 hours to drain the capacitor completely.
After letting the calculator sit without batteries for at least 24 hours, replace with fresh batteries.
If the calculator continues to malfunction, it will need to be sent in for repair or replaced.