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For details about initialized settings, see “Configuring the Calculator
Setup”.
4. Initialize all modes and settings by performing the following operation:
(CLR)(Setup)(Yes).
Replacing the Battery
A low battery is indicated by a dim display, even if contrast is adjusted, or by
failure of figures to appear on the display immediately after you turn on the
calculator. If this happens, replace the battery with a new one.
Important: Removing the battery will cause all of the calculator’s memory
contents to be deleted.
1. Press (OFF) to turn off the calculator.
• To ensure that you do not accidentally turn on power while replacing the
battery, slide the hard case onto the front of the calculator (fx-991ES
PLUS).
2. Remove the cover as shown in the illustration and replace the battery,
taking care that its plus (+) and minus (–) ends are facing correctly.
Screw
Screw Screw
fx-570ES PLUS fx-991ES PLUS
3. Replace the cover.
4. Initialize the calculator: (CLR)(All)(Yes)
• Do not skip the above step!
Specifications
Power Requirements:
fx-570ES PLUS: AAA-size battery R03 (UM-4)
s 1
fx-991ES PLUS: Built-in solar cell; button battery LR44 (GPA76)
s 1
Approximate Battery Life:
fx-570ES PLUS: 17,000 hours (continuous display of flashing cursor)
fx-991ES PLUS: 3 years (based on one hour of operation per day)
Power Consumption: 0.0002 W (fx-570ES PLUS)
Operating Temperature: 0°C to 40°C (32°F to 104°F)
Dimensions:
fx-570ES PLUS: 13.8 (H)
s80 (W) s162 (D) mm
1
/
2
(H) s3
1
/
8
(W) s6
3
/
8
(D)
fx-991ES PLUS: 11.1 (H)
s80 (W) s162 (D) mm
3
/
8
(H) s3
1
/
8
(W) s6
3
/
8
(D)