Sharp EL-9900 - Manual (Page 39)

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Chapter 2: Operating the Graphing Calculator
Resetting the Calculator
Use the reset when a malfunction occurs, to delete all data, or to set all mode values
to the default settings. The resetting can be done by either pressing the reset switch
located in the battery compartment, or by selecting the reset in the OPTION menu.
Resetting the calculator’s memory will erase all data stored by the user; proceed with
caution.
1. Using the reset switch
1. Pull down the notch to open the battery cover located on the
back of the calculator.
2. Place the battery cover back until the notch is snapped on.
3. Press O.
The verification window will
appear on the screen.
4. Press C to clear all the
stored data. Press O to
cancel resetting. After C
is pressed, the calculator's
memory will be initialized.
Press any key to display the
calculation screen.
Note: If the above verification window does not appear, remove the
battery cover and gently push the RESET switch with the tip of a
ball-point pen or a similar object.
DO NOT use a tip of a pencil
or mechanical pencil, a
broken lead may cause a
damage to the button mecha-
nism.