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

ScrewScrew

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) σ 1

fx-991ES PLUS: Built-in solar cell; button battery LR44 (GPA76) σ 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) σσ80 (W) σσ162 (D) mm 1/2 (H) σσ31/8 (W) σσ 63/8 (D)

fx-991ES PLUS: 11.1 (H) σσ80 (W) σσ162 (D) mm 3/8 (H) σσ31/8 (W) σσ 63/8 (D)

E-42