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Casio fx-100W, fx-115W, fx-570W, fx-991W Replacing the Battery, •Replacing the Battery, • To replace the battery, E-35, Screw, P button, < fx-570W, 3Remove the old battery, 7Press Lto turn power on

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< fx-570W >This calculator is powered by single G13 Type (LR44) button battery.

•Replacing the Battery

Dim figures on the display of the calculator indicate that battery power is low. Continued use of the calculator when the battery is low can result in improper operation. Replace the battery as soon as possible when display figures become dim.

• To replace the battery1Press ito turn power off.

2Remove the two screws that hold the battery cover in place and then remove the battery cover.

3Remove the old battery.

4Wipe off the side of new battery with a dry, soft cloth. Load it into the unit with the positive k side facing up (so you can see it).

5Replace the battery cover and secure it in place with the two screws.

6Use a thin, pointed object to press the P button. Be sure not to skip this step.

7Press Lto turn power on.

Screw

P button

E-35

Contents

Page ENGLISH Removing and Replacing the Calculator’s Cover Safety Precautions Disposing of the Calculator Handling Precautions •Avoid use and storage in areas subjected to tempera- ture extremes Avoid use and storage in areas subjected to large amounts of humidity and dust •Never drop the calculator or otherwise subject it to strong impact •Never twist or bend the calculator •Never try to take the calculator apart Contents Two-lineDisplay Key Layout <fx-991W fx-115W: E-7 Before Starting Calculations kModes kInput Capacity kMaking Corrections During Input kReplay Function kError Locator kExponential Display Formats F FF F3 kAnswer Memory Basic Calculations Memory Calculations kIndependent Memory kVariables AC Fraction Calculations kFraction Calculations kDecimal-to-FractionConversion kFraction-to-DecimalConversion Percentage Calculations Av+ Av Scientific Function Calculations kTrigonometric/Inverse Trigonometric Functions qqq 1→“ R ” qqq 2→“ T ” kAngle Unit Conversion FFF1 → “ R ” 4.25Av 2(R) kCommon and Natural Logarithms Antilogarithms kFIX, SCI, RND FFF F13 FFFF FFFF2 21 \3 FFFF31 kENG Calculations kInputting ENG Calculation Symbols FFF FF2 F FFFF kCoordinate Conversion (Pol(x, y), Rec (r, θ)) AF 2 P60 T Af1 P L3 T kPermutation kCombination Statistical Calculations kStandard Deviation (SD Mode) Am σn-1 kProbability Distribution Calculations kRegression Calculations (REG Mode) Σx2 qq 2 Complex Number Calculations (CMPLX Mode) R2 +3 iT+ R4 +5 iT kAbsolute Value/Argument Calculation A AR 3 +4 iT Formula Memory pypu pxK + Metric Conversions (fx-570W/fx-991W) 31 A c CONV Scientific Constants (fx-570W/fx-991W) • Scientific Constant Table E-27 Base-n Calculations lll4(o) 76548 lll1 lll3 Integration Calculations d 2 p xK +3 px+ Degrees, Minutes, Seconds Calculations Technical Information kWhen you have a problem kError Messages kOrder of Operations kStacks kPower Supply < fx-570W This calculator is powered by single G13 Type (LR44) button battery • To replace the battery 1Press ito turn power off 3Remove the old battery 5Replace the battery cover and secure it in place with the two screws 7Press Lto turn power on • Auto Power Off kInput Ranges nCr Specifications Page CASIO COMPUTER CO., LTD 6-2, Hon-machi 1-chome Shibuya-ku,Tokyo 151-8543,Japan