434
Appendix B Power Supply
•Power supplied by memory back up battery while the main power supply
batteries are removed for replacement retains memory contents.
•Do not leave the calculator 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.
uu
uu
uTo replace the memory back up battery
*Before replacing the memory back up battery, turn on the calculator 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 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 to turn off the calculator.
Warning!
*Be sure to turn the calculator off before replacing batteries. Replacing
batteries with power on will cause data in memory to be deleted.
2. Making sure that you do not accidently press the o key, attach the case to
the calculator and then turn it over.
3. Remove the back cover from the calculator by
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.
1
A
B
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