Sharp EL9900C EL-9900C - Page 239

Procedures for replacing unit operation batteries 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 compartment cover, and open the cover as illustrated. 3. Replace all four AAA batteries as illustrated. 4. Replace the battery compartment cover. Appendix 5. Press O. The following message will appear. If the message does not appear, repeat the procedures from step 2. 6. Press O. Do not press C. This will clear all the data. Replacing the memory backup battery Once every 5 years, the lithium battery will need to be replaced. The lithium battery is used to maintain the memory of the calculator. Note: Do not remove the lithium battery while the unit operation batteries are removed; otherwise all the calculator's stored memory will be lost. 229