Power Supply; Auto Power Off; System* Self Test Function - Casio FX-890P Owner's Manual

Characters which cannot be displayed using keyboard input can be displayed using
the CHR$ function.

1.7 Power Supply

This unit is equipped with a main power supply (four AA Alkaline batteries) and a
backup power supply (one CR2032 lithium battery). Batteries should be replaced
whenever the display remains dim, even after contrast adjustment. Batteries should
also be replaced once every two years regardless of how much the unit has been
used.
Battery Replacement
1) Switch the power of the unit OFF and
remove the rear panel of the unit after
removing the three screws holding it in
place.
2) To replace the four batteries of the main
power supply, position the internal switch to
the right, slide the cover of the battery
compartment and replace the four AA
batteries.
Put back the internal switch in its central
position
3) To replace the memory backup battery,
position the internal switch to the left, slide
the cover of the battery compartment and
replace the CR2032 battery.
Put back the internal switch in its central
position
4) Replace the rear panel on the unit and three screws to hold it in place.

1.8 Auto Power Off

The power of the unit is automatically switched OFF approximately 6 minutes after
the last key operation (except during program execution), or the last input for an
INPUT statement or PRINT statement. Power can be resumed by either switching
the power switch OFF and then ON again, or by pressing the BRK key.
Program and data contents are retained even when power is switched OFF, but
settings such as the number of digits or the mode (i.e. BASIC mode) are cancelled.

1.9 SYSTEM* Self Test Function

The unit has a powerful built-in self-test function you can address by entering the
following command:
.S Y S T E M * . .
[0]ROM
[4]RAM
[8]3Pin Connector[9]DISPLOOP
[+]I/O
13
Screws
P
Switch
[1]LCD [2]KEY
[5]RAMW [6]RAMR [7]DISP
[3]LB