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					fx-9860GII SD   
					fx-9860GII   
					fx-9860G AU PLUS   
					fx-9750GII   
					fx-7400GII   
					Hardware   
					User’s Guide   
					CASIO Worldwide Education Website   
					
					CASIO EDUCATIONAL FORUM   
					
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				BEFORE USING THE CALCULATOR   
					FOR THE FIRST TIME...   
					Batteries are not loaded in your calculator at the factory.   
					Be sure to follow the procedure below to load batteries and adjust the display contrast   
					before trying to use the calculator for the first time.   
					1. Making sure that you do not accidently press the M key, slide the case onto the   
					calculator and then turn the calculator over. Remove the battery cover from the   
					calculator by pulling with your finger at the point marked ꢀ.   
					ꢀ 
					ꢀ 
					fx-9860GII SD   
					fx-9860GII   
					fx-9750GII   
					fx-7400GII   
					fx-9860G AU PLUS   
					2. Load the four batteries that come with the   
					calculator.   
					• Make sure that the positive (+) and negative (–)   
					ends of the batteries are facing correctly.   
					3. Replace the battery cover, making sure that   
					its tabs enter the holes marked ꢁ and turn the   
					calculator front side up. The calculator will turn on   
					automatically and the MAIN MENU will appear on   
					the display.   
					ꢁ 
					ꢁ 
					i 
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				• If the Main Menu shown to the right is not on the   
					display, press the RESTART button on the back   
					of the calculator.   
					RESTART button   
					The above screen shows   
					the fx-9860GII SD. The   
					appearance of the screens   
					of other models may be   
					slightly different.   
					4. Use the cursor keys (D, A, B, C) to select the SYSTEM icon and press U,   
					then press ꢀ(   
					) to display the contrast adjustment screen.   
					5. Adjust the contrast.   
					• The C cursor key makes display contrast darker.   
					• The B cursor key makes display contrast lighter.   
					• ꢀ(INIT) returns display contrast to its initial default.   
					6. To exit display contrast adjustment, press K.   
					ii   
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				Precautions when Using this Product   
					A progress bar and/or a busy indicator appear on the display whenever the calculator is performing   
					a calculation, writing to memory, or reading from memory.   
					Busy indicator   
					Progress bar   
					Never press the RESTART button or remove the batteries from the calculator when the progress   
					bar or busy indicator is on the display. Doing so can cause memory contents to be lost and can   
					cause malfunction of the calculator.   
					fx-7400GII, fx-9750GII users...   
					You can transfer data to a computer using the optionally available Program-Link software (FA-124).   
					The Program-Link software can be used to backup data to a computer.   
					fx-9860GII SD, fx-9860GII, fx-9860G AU PLUS users...   
					The calculator is equipped with flash memory for data storage. It is recommended that you always   
					backup your data to flash memory. For details about the backup procedure, see “Using the Memory   
					Manager” (page 11-1) in the separate Software Version 2.00 User’s Guide.   
					You can also transfer data to a computer using the Program-Link software (FA-124) that comes   
					bundled with the calculator. The Program-Link software can also be used to backup data to a   
					computer.   
					fx-9860GII SD only   
					If the message “No Card” appears even though an SD card is loaded in the SD card slot, it means   
					that the calculator is not recognizing the card for some reason. Try removing the card and then   
					loading it again. If this does not work, contact the developer of the SD card. Note that some SD   
					cards may not be compatible with this calculator.   
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				Handling Precautions   
					• Your calculator is made up of precision components. Never try to take it apart.   
					• Avoid dropping your calculator and subjecting it to strong impact.   
					• Do not store the calculator or leave it in areas exposed to high temperatures or humidity, or large   
					amounts of dust. When exposed to low temperatures, the calculator may require more time to   
					display results and may even fail to operate. Correct operation will resume once the calculator is   
					brought back to normal temperature.   
					• The display will go blank and keys will not operate during calculations. When you are operating   
					the keyboard, be sure to watch the display to make sure that all your key operations are being   
					performed correctly.   
					• Replace the main batteries once every one year regardless of how much the calculator is used   
					during that period. Never leave dead batteries in the battery compartment. They can leak and   
					damage the unit.   
					• Do not use an oxyride battery* or any other type of nickel-based primary battery with this product.   
					Incompatibility between such batteries and product specifications can result in shorter battery life   
					and product malfunction.   
					• Keep batteries out of the reach of small children. If swallowed, consult a physician immediately.   
					• Avoid using volatile liquids such as thinner or benzine to clean the unit. Wipe it with a soft, dry   
					cloth, or with a cloth that has been moistened with a solution of water and a neutral detergent and   
					wrung out.   
					• Always be gentle when wiping dust off the display to avoid scratching it.   
					• In no event will the manufacturer and its suppliers be liable to you or any other person for any   
					damages, expenses, lost profits, lost savings or any other damages arising out of loss of data   
					and/or formulas arising out of malfunction, repairs, or battery replacement. It is up to you to   
					prepare physical records of data to protect against such data loss.   
					• Never dispose of batteries, the liquid crystal panel, or other components by burning them.   
					• Be sure that the power switch is set to OFF when replacing batteries.   
					• If the calculator is exposed to a strong electrostatic charge, its memory contents may be   
					damaged or the keys may stop working. In such a case, perform the Reset operation to clear the   
					memory and restore normal key operation.   
					• If the calculator stops operating correctly for some reason, use a thin, pointed object to press the   
					RESTART button on the back of the calculator. Note, however, that this clears all the data in   
					calculator memory.   
					• Note that strong vibration or impact during program execution can cause execution to stop or can   
					damage the calculator’s memory contents.   
					• Using the calculator near a television or radio can cause interference with TV or radio reception.   
					• Before assuming malfunction of the unit, be sure to carefully reread this User’s Guide and ensure   
					that the problem is not due to insufficient battery power, programming or operational errors.   
					* Company and product names used in this manual may be registered trademarks or trademarks of   
					their respective owners.   
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				Be sure to keep physical records of all important data!   
					The large memory capacity of the unit makes it possible to store large amounts of data.   
					You should note, however, that low battery power or incorrect replacement of the batteries that   
					power the unit can cause the data stored in memory to be corrupted or even lost entirely. Stored   
					data can also be affected by strong electrostatic charge or strong impact. It is up to you to keep   
					back up copies of data to protect against its loss.   
					Since this calculator employs unused memory as a work area when performing its internal   
					calculations, an error may occur when there is not enough memory available to perform   
					calculations. To avoid such problems, it is a good idea to leave 1 or 2 kbytes of memory free   
					(unused) at all times.   
					In no event shall CASIO Computer Co., Ltd. be liable to anyone for special, collateral, incidental, or   
					consequential damages in connection with or arising out of the purchase or use of these materials.   
					Moreover, CASIO Computer Co., Ltd. shall not be liable for any claim of any kind whatsoever   
					against the use of these materials by any other party.   
					• The contents of this User’s Guide are subject to change without notice.   
					• No part of this User’s Guide may be reproduced in any form without the express written   
					consent of the manufacturer.   
					• Be sure to keep all user documentation handy for future reference.   
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				Contents   
					1. Key Layout   
					2. Using the Backlight   
					3. Specifications   
					4. Restart and Reset   
					5. Power Supply   
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				1. Key Layout   
					fx-9860G SD/fx-9860G /fx-9860G AU PLUS   
					fx-9750G   
					II   
					II   
					II   
					fx-7400G   
					II   
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				2. Using the Backlight   
					(fx-9860GII SD/fx-9860GII/fx-9860G AU PLUS only)   
					Your calculator is equipped with a backlight for easy reading, even in the dark.You can   
					conserve battery power by limiting backlight operation to only when you need it.   
					S To turn the backlight on or off   
					Press   
					*(LIGHT) to toggle the backlight on and off.   
					• Changing the Backlight On/Off Key   
					You can configure the calculator so the backlight turns on when any key is pressed, instead   
					of requiring the   
					*(LIGHT) to toggle the backlight on and off. For details, see “To specify   
					the backlight key” (page 12-2) in the separate Software Version 2.00 User’s Guide.   
					• Backlight duration   
					The backlight turns off automatically if you do not perform any key operation for a preset   
					amount of time (30 seconds or 10 seconds).   
					• If you perform a key operation, the backlight duration will be extended for the applicable   
					preset amount of time (30 seconds or 10 seconds).   
					• See “To specify the backlight duration” (page 12-2) in the Software Version 2.00 User’s Guide   
					for information about how to specify 30 seconds or 10 seconds as the backlight duration   
					time.   
					• Backlight and Battery Life   
					• Frequent use of the backlight will shorten battery life.   
					• The following are guidelines that show how battery life is affected by backlight use. It is   
					based on a new set of alkaline batteries at a temperature of 25°C.   
					Backlight Use   
					Approximate Battery Life   
					5 minutes calculation*1, 55 minutes display per hour; no   
					backlight use   
					200 hours (80 hours*2)   
					5 minutes calculation*1, 55 minutes display, 3 minutes   
					backlight operation per hour   
					190 hours (75 hours*2)   
					5 minutes calculation*1, 55 minutes display, 15 minutes   
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				3. Specifications   
					Variables: 28   
					Calculation range:   
					p1 × 10–99 to p9.999999999 × 1099 and 0. Internal operations use 15-digit mantissa.   
					Exponential display range: Norm 1: 10–2 > |x|, |x| ꢂ 1010   
					Norm 2: 10–9 > |x|, |x| ꢂ 1010   
					Program capacity: fx-9860GII SD/fx-9860GII/fx-9860G AU PLUS/fx-9750GII   
					62,000 bytes (max.)   
					fx-7400GII   
					20,000 bytes (max.)   
					Storage memory capacity: fx-9860GII SD/fx-9860GII/fx-9860G AU PLUS: 1.5MB (max.)   
					fx-9750GII/fx-7400GII: None   
					Power supply: Four AAA-size batteries (LR03 (AM4))   
					Power consumption: fx-9860GII SD/fx-9860GII/fx-9860G AU PLUS: 0.7 W   
					fx-9750GII/fx-7400GII: 0.35 W   
					Approximate battery life   
					fx-9860GII SD/fx-9860GII/fx-9860G AU PLUS:   
					280 hours (continuous display of main menu)   
					200 hours* continuous operation (5 minutes calculation, 55 minutes display)   
					* fx-9860GII SD: 80 hours when an SD card is used   
					190 hours* continuous operation (5 minutes calculation, 55 minutes display,   
					E-7   
				Dimensions: fx-9860GII SD/fx-9860GII/fx-9860G AU PLUS:   
					21.2 mm (H) s 91.5 mm (W) s 184.0 mm (D)   
					7 
					5 
					1 
					8 
					8 
					4 
					/ " (H) s 3 / " (W) s 7 / " (D)   
					fx-9750GII/fx-7400GII:   
					21.3 mm (H) s 87.5 mm (W) s 180.5 mm (D)   
					7 
					1 
					1 
					8 
					2 
					8 
					/ " (H) s 3 / " (W) s 7 / " (D)   
					Approximate weight: fx-9860GII SD: 225 g (7.9 oz) (including batteries)   
					fx-9860GII/fx-9860G AU PLUS: 220 g (7.8 oz) (including batteries)   
					fx-9750GII/fx-7400GII: 205 g (7.2 oz) (including batteries)   
					Data Communications   
					3-pin serial port   
					Method: Start-stop (asynchronous), half-duplex   
					Transmission speed (BPS):   
					115200 bits/second (normal)   
					9600 bits/second (When connected to CFX-9850G series or fx-7400G series calculator;   
					Send/Receive commands)   
					38400 bits/second (Send38k/Receive38k commands)   
					<115200 bits/second>   
					Parity: EVEN   
					Bit length: 8 bits   
					Stop bit:   
					Send: 1 bit   
					Receive: 1 bit   
					Includes parity (None) 1-bit   
					X ON/X OFF Control: None   
					<9600, 38400 bits/second>   
					Parity: None   
					Bit length: 8 bits   
					Stop bit:   
					Send: 3 bits   
					Receive: 2 bits   
					Includes parity (None) 1-bit   
					X ON/X OFF Control: None   
					USB port (All models except fx-7400GII)   
					In accordance with USB 1.1 standards   
					E-8   
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				4. Restart and Reset   
					S Restart   
					Should the calculator start to act abnormally, you can restart it by pressing the RESTART   
					button. Note, however, that you should only use the RESTART button only as a last resort.   
					Normally, pressing the RESTART button reboots the calculator’s operating system, so   
					programs, graph functions and other data in calculator memory is retained.   
					RESTART button   
					fx-9860GII SD   
					fx-9860GII   
					fx-9750GII   
					fx-7400GII   
					fx-9860G AU PLUS   
					Important!   
					The calculator backs up user data (main memory) when you turn power off and loads the   
					backed up data when you turn power back on.   
					When you press the RESTART button, the calculator restarts and loads backed up data.   
					This means that if you press the RESTART button after you edit a program, graph function,   
					or other data, any data that has not been backed up will be lost.   
					S Reset   
					Use reset when you want to delete all data currently in calculator memory and return all   
					mode settings to their initial defaults.   
					Before performing the reset operation, first make a written copy of all important data.   
					For details, see “Reset” (page 12-3) in the separate Software Version 2.00 User’s Guide.   
					5. Power Supply   
					This calculator is powered by four AAA-size (LR03 (AM4)) batteries.   
					If the following message appears on the display, immediately turn off the calculator and   
					replace the batteries as instructed.   
					E-9   
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				If you try to continue using the calculator, it will automatically turn off in order to protect   
					memory contents.You will not be able to turn power back on until you replace batteries.   
					Be sure to replace the batteries at least once every one year, no matter how much you use the   
					calculator during that time.   
					The batteries that come with this calculator discharge slightly during shipment and storage.   
					Because of this, they may require replacement sooner than the normal expected battery life.   
					I Replacing Batteries   
					Precautions:   
					Incorrectly using batteries can cause them to burst or leak, possibly damaging the interior of   
					the calculator. Note the following precautions:   
					• Be sure that the positive (+) and negative (–) poles of each battery are facing in the proper   
					directions.   
					• Never mix batteries of different types.   
					• Never mix old batteries and new ones.   
					• Never leave dead batteries in the battery   
					compartment.   
					• Remove the batteries if you do not plan to   
					use the calculator for long periods.   
					• Never try to recharge the batteries supplied   
					with the calculator.   
					• Do not expose batteries to direct heat, let   
					them become shorted, or try to take them   
					apart.   
					(Should a battery leak, clean out the battery compartment of the calculator immediately, taking   
					care to avoid letting the battery fluid come into direct contact with your skin.)   
					Keep batteries out of the reach of small children. If swallowed, consult with a physician   
					immediately.   
					S To replace the batteries   
					• Never turn on the calculator while the batteries are removed or not loaded correctly. Doing   
					so can cause memory data to be deleted and malfunction of the calculator. If mishandling   
					of batteries causes such problems, correctly load batteries and then perform the restart   
					operation to resume normal operation.   
					• Be sure to replace all four batteries with new ones.   
					1. Press   
					Warning!   
					M(OFF) to turn off the calculator.   
					• Be sure to turn the calculator off before replacing batteries. Replacing batteries with power   
					on will cause data in memory to be deleted.   
					E-10   
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				2. Making sure that you do not accidently press the M key, slide the case onto the calculator   
					and then turn it over.   
					3. Remove the battery cover from the calculator by   
					ꢀ 
					ꢀ 
					pulling with your finger at the point marked ꢀ.   
					4. Remove the four old batteries.   
					5. Load a new set of four batteries, making sure that   
					their positive (+) and negative (–) ends are facing in   
					the proper directions.   
					fx-9860GII SD   
					fx-9860GII   
					fx-9750GII   
					fx-7400GII   
					6. Replace the battery cover.   
					fx-9860G AU PLUS   
					7. Turn the calculator front side up and slide off its   
					case. Next, press M to turn on power.   
					• If the figures on the display appear too light and hard to see after you turn on power, adjust   
					the contrast.   
					I About the Auto Power Off Function   
					Calculator power turns off automatically if you do not perform any operation within the Auto   
					Power Off trigger time you specify.You can specify either 10 minutes or 60 minutes as the   
					trigger time (see “Power Properties Settings” on page 12-1). To restore power, press M.   
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				Manufacturer:   
					CASIO COMPUTER CO., LTD.   
					6-2, Hon-machi 1-chome   
					Shibuya-ku, Tokyo 151-8543, Japan   
					Responsible within the European Union:   
					CASIO EUROPE GmbH   
					Casio-Platz 1   
					22848 Norderstedt, Germany   
					This mark applies in EU countries only.   
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				CASIO COMPUTER CO., LTD.   
					6-2, Hon-machi 1-chome   
					Shibuya-ku, Tokyo 151-8543, Japan   
					One or more of the following patents may be used in the product.   
					U.S.Pats. 5,166,897 5,210,708 5,535,317 5,539,867   
					SA0902-A   
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