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Appendix

P.11

u u u u u To replace the memory back up battery

1. Press !O to turn the calculator off

2. Making sure that you do not accidently press the o key, attach the case to the

3. Remove the back cover from the unit by pull-

4. Remove screw

5. Remove the old battery.

198

• Power will not switch on if you press o while the back cover is open.

• Do not leave the unit 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.

* 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 battery. Replacing battery 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.

calculator and then turn the calculator over.

ing with your finger at the point marked

on the back of the calcula-

tor, and remove the back up battery holder.

✩