Sharp EL-9900 Operation Manual page 239

Procedures for
replacing unit
operation
batteries
Replacing the
memory backup
battery
Note:
When battery power becomes
low, a message will show
indicating that a new set of
batteries are needed.
1. Turn off the calculator's
power (@ o).
2. Turn over the calculator.
Locate the battery compart-
ment cover, and open the
cover as illustrated.
3. Replace all four AAA
batteries as illustrated.
4. Replace the battery com-
partment cover.
5. Press O.
The following message will
appear.
If the message does not
appear, repeat the proce-
dures from step 2.
6. Press O.
C C . This will clear all the data. C
Do not press C C
Once every 5 years, the lithium battery will need to be replaced.
The lithium battery is used to maintain the memory of the
calculator.
Do not remove the lithium battery while the unit operation
batteries are removed; otherwise all the calculator's stored
memory will be lost.
Appendix
229