Sometimes the HP 33 S calculator may locks up or will not respond correctly. The calculator might require a reset for a variety of reasons. The first reset listed below will not affect the memory on the HP 33 S calculator. However, the other resets will erase the memory and restore the HP 33’s defaults. For this reason, it is important that you back up any critical data before resetting.

Resetting the calculator using the HP 33 S keyboard

To halt the calculator and reset the keyboard, follow the procedure below:

The calculator may not appear to change, depending on what was displayed on the HP 33 screen.

To completely reset the calculator and erase all user memory, follow the procedure below:

Resetting to drain the HP 33 S capacitor

If the above resets do not resolve the calculator problem, try one of the following resetting procedures:

HP 33 S Coin reset

HP 33 S Paperclip reset