Casio fx-7400G Appendix - Manual (Page 6)

174
Appendix
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To replace the memory back up battery
* Before replacing the memory back up battery, switch on the unit and check to
see if the “Low battery!” message appears on the display. If it does, replace the
main power supply batteries before replacing the back up power supply battery.
* 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.
* Be sure to replace the back up power supply battery at least once 2 years, re-
gardless of how much you use the unit during that time. Failure to do so can
cause data in memory to be deleted.
1. Press !O to turn the calculator 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 screw
i
on the back of the calcula-
tor, and remove the back up battery holder.
4. Remove the old battery.
5. Wipe off the surfaces of a new battery with a
soft, dry cloth. Load it into the calculator so
that its positive (+) side is facing up.
6. Pressing down on the battery with the battery
holder, replace the screw that secures the
holder in place.
7. Replace the battery compartment cover and
press o to turn power on. The main battery
provides power to the memory while the back-
up batteries are removed, so memory data is
not lost.
k k k k k About the Auto Power Off Function
The calculator switches power off automatically if you do not perform any key opera-
tion for about 6 minutes. To restore power, press
o .
The calculator automatically turns off it is left for about 60 minutes with a calculation
stopped by an output command (
^
), which is indicated by the “–Disp–” message on
the display.