HP 12c Quick Start Manual

HP 12c Calculator - Resetting the Calculator
Description
Resetting the calculator using the keyboard
Resetting to drain the capacitor
Other solutions
Description
Sometimes a calculator will lock up or will not respond correctly. The calculator may
require a reset for a variety of reasons. These resets will erase the memory on the
calculator and restore the calculator's defaults. For this reason, it is important to back
up any critical data.
Resetting the calculator using the keyboard
The easiest reset is done from the keyboard. To reset the calculator, follow the
procedures below in the order presented.
1. Press ON to turn off the calculator.
2. Press and hold [ - ].
3. Press and release ON.
4. Release [ - ].
5. The screen will display "Pr Error"
6. The calculator will reset to the default settings, and the memory will be
erased.
If the above reset did not restore the calculator to normal, continue to the next
section.
Resetting to drain the capacitor
If the calculator is still performing unexplained errors or will not turn on, it might have
a static charge. This means the capacitor is full. The previous reset will not drain the
capacitor. With this calculator, there are two options for draining the capacitor. The
option to use is dependent upon the serial number of the calculator to be reset. The
first option is a paperclip reset.
Paperclip reset