Replacing Batteries - Casio fx-7400G Service Manual & Parts List

3. REPLACING BATTERIES

• To replace the main power supply batteries
1 Press
to turn the calculator off.
SHIFT OFF
2 Push the battery compartment cover on the back of the calculator
in the direction noted in the illustration and remove it.
3 Remove the two old batteries.
4 Load a new set of two batteries, making sure that their positive +
and negative - ends are facing in the proper directions.
5 Replace the battery compartment cover and press
power on. The memory back-up battery provides power to the
memory while the main batteries are removed, so memory data
is not lost .
• Power will not switch on if you press
supply battery compartment cover is open.
• Do not leave the unit without main power supply batteries loaded
for long periods. Doing so can cause deletion of data stored in
memory.
• If the figures on the display appear too light and hard to see after
you turn on power, adjust the contrast using the following
procedure.
1. Press .
MENU
2. Use the cursor keys (
press to display the contrast adjustment screen.
7
3. Press to make the figure on the screen lighter or
4. After getting the contrast the way you want it, press
REMARK
* Never remove the main power supply and the memory back up batteries from the unit at the same time.
* Be sure to switch the unit off before replacing batteries. Replacing batteries with power on will cause
data in memory to be deleted.
* Never replace the main power supply battery compartment cover or turn the calculator on while the
main power supply batteries are removed from the calculator or not loaded correctly. Doing so can
cause memory data to be deleted and malfunction of the calculator. If mishandling of batteries causes
such problems, correctly load batteries and then perform the RESET operation to resume normal
operation.
* Be sure to replace all two batteries with new ones.
while the main power
AC/
ON
, , , ) to select the CONT icon and press
— 4 —
to turn
AC/
ON
to make them darker.
to return to the main menu.
MENU
or simply
EXE