HP HP-18C - Resetting the Calculator

Figure C-2. Pressing the Batteries Into Place
7. Slide the contact plate into the grooves. If necessary, use your
finger to push the single battery into the compartment so that
the door can slide over it. Slide the door until it latches into
place.
Figure C-3. Closing the Battery Compartment Door
Resetting the Calculator
If the calculator fails to respond to keystrokes or if it is otherwise be-
having unusually, you should attempt to reset it. Resetting the
calculator halts the current calculation, clears the calculator line, and
displays the MAIN menu.
To reset the calculator, hold down the ION I key while you press the
third menu key from the left. It may be necessary to repeat the reset
keystrokes several times. The HP-18C displays:
MACHINE RESET
C: Caring for and Using Your Calculator 187