Casio PF-8000 Operation Manual page 5

2. Memory backup battery
Turn off the power switch and follow the same procedure as in trm (MM nt main hnltRry
replacement, beginning by removing screw (g). Replace this auxiliary Imtlmy eivnty 2
years irrespective Of main battery replacement.
Note:
If the main batteries for calculation/display and the auxiliary battery for memory beck
up are removed at the same time, the memory contents will be lost. Be sure to keep
either in place.
* Never throw the old batteries into a fire. This is very dangerous because they are
likely to explode.
* Never confuse the (+) and (-) sides of the batteries.
Store the batteries out of reach of infants. If an infant swallows a battery, consult a
physician at once.
This is an automatic power saving function for preventing wasteful power consumption
that will result should you forget to turn off the power switch. The power supply is
automatically cut off about 6 minutes after completion of operation.
In this case, power can be resumed by pressing the c*jjokey or turning the power switch
off and then on again.
* Even when the power is off, independent memory and data memory contents are
retained. However, mode designations ( ua , H , Hmo*, etc.) are canceled except
that of the finger input mode ( D ).
Adjustment of display contrast can be performed using the adjustment control located
on the right side of the unit. Turn in the direction of the arrow to increase contrast.
Turn in the opposite direction to reduce contrast. This is used to compensate contrast of
the display in accordance with battery capacity or to adjust to compensate for the
viewing angle.