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• Check the dimensions specified for the matrices or vectors to see if they are compatible with the calculation. Variable ERROR (SOLVE feature only) Cause: • You did not specify a solution variable, and there is no X variable in the equation you input. • The solution variable that you specified is not included in the equation you input. Action: • The equation you input must include an X variable when you do not specify the solution variable. • Specify a variable that is included in the equation you input as the solution variable. Can’t Solve Error (SOLVE feature only) Cause: The calculator could not obtain a solution. Action: • Check for errors in the equation that you input. • Input a value for the solution variable that is close to the expected solution and try again. Insufficient MEM Error Cause: The configuration of TABLE Mode parameters caused more than 30 X-values to be generated for a table. Action: Narrow the table calculation range by changing the Start, End, and Step values, and try again. Time Out Error Cause: The current differential or integration calculation ends without the ending condition being fulfilled. Action: Try increasing the tol value. Note that this also decreases solution precision. Before Assuming Malfunction of the Calculator... Perform the following steps whenever an error occurs during a calculation or when calculation results are not what you expected. If one step does not correct the problem, move on to the next step. Note that you should make separate copies of important data before performing these steps. 1. Check the calculation expression to make sure that it does not contain any errors. 2. Make sure that you are using the correct mode for the type of calculation you are trying to perform. 3. If the above steps do not correct your problem, press the .. key. This will cause the calculator to perform a routine that checks whether calculation functions are operating correctly. If the calculator discovers any abnormality, it automatically initializes the calculation mode and clears memory contents. E-41 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) .. 1 fx-991ES PLUS: Built-in solar cell; button battery LR44 (GPA76) .. 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) ....80 (W) ....162 (D) mm 1/2.. (H) ....31/8.. (W) ......63/8.. (D) fx-991ES PLUS: 11.1 (H) ....80 (W) ....162 (D) mm 3/8.. (H) ....31/8.. (W) ......63/8.. (D) E-42 Approximate Weight: fx-570ES PLUS: 100 g (3.5 oz) including the battery fx-991ES PLUS: 95 g (3.4 oz) including the battery Frequently Asked Questions I How can I perform input and display results the same way I did on a model that does not have Natural Textbook Display? Perform the following key operation: ....(SETUP)..(LineIO). See “Configuring the Calculator Setup” on page E-5 for more information. I How can I change a fraction format result to decimal format? How can I change a fraction format result produced by a division operation to decimal format? See “Toggling Calculation Results” on page E-9 for the procedure. I What is the difference between Ans memory, independent memory, and variable memory? Each of these types of memory acts like “containers” for temporary storage of a single value. Ans Memory: Stores the result of the last calculation performed. Use this memory to carry the result of one calculation on to the next. Independent Memory: Use this memory to totalize the results of multiple calculations. Variables: This memory is helpful when you need to uses the same value multiple times in one or more calculations. I What is the key operation to take me from the STAT Mode or TABLE Mode to a mode where I can perform arithmetic calculations? Press ....(COMP). I How c...

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