Casio ALGEBRA FX 2.0 PLUS Appendix - Manual (Page 27)

19990401
u To replace the memory back up battery
* Before replacing the memory back up battery, check to make sure the main batteries
are not dead.
* Never remove the main power supply and the memory back up batteries from the
calculator at the same time.
* Be sure to replace the back up power supply battery at least once 2 years, regardless
of how much you use the calculator during that time. Failure to do so can cause data in
memory to be deleted.
1. Press !o(OFF) to turn off the calculator.
Warning!
* Be sure to turn the calculator off before replacing battery. Replacing battery with power
on will cause data in memory to be deleted.
2. Making sure that you do not accidently press the o key, slide the case onto the
calculator and then turn it over.
3. Remove the back cover from the calculator by
1
pulling with your finger at the point marked 1.
4. Remove screw i on the back of the calculator, and
remove the back up battery compartment cover.
5. Insert a thin, pointed non-metal object (such as a
toothpick) into the hole maked j and remove the old
battery.
α
-7-4
Power Supply
P
A B
BACK UP