HP 48g Graphing Calculator - Manual (Page 75)

Sometimes the HP 48 may freeze up and won’t respond to (0N}-Q
because it isn’t accepting input from the keyboard. At these times,
you need to execute the system halt directly, without using the
keyboard.
To halt the system without using the keyboard:
1. Turn the calculator over and remove the top right (as you face the
back side of the machine) rubber foot. You should see a small hole
with the letter R next to it.
I
c ® 32K/128KONLY
c®
D.
-Reset hole
2. Insert the end of an ordinary metal paper clip into the hole as far
as it goes. Hold for one second and remove,
3. Press (^.
4. If necessary, press
(ON
l-fcl. If this still doesn’t work, you need to
try a memory reset.
Memory Reset
A memory reset can reset the HP 48 to its factory-default state,
erasing all information you’ve stored. Use this function very carefully.
To perform a memory reset:
1. Press and hold down these three keys simultaneously: (ON~), the
menu key, and the © menu key.
2. Release the two menu keys, but continue to hold (ON):
■ If you want to continue with the memory reset, release (ON).
a If you want to cancel the memory reset, press the menu key,
then release (ON).
Memory 5-17