PLC490 - Calculator LEXIBOOK - Free user manual and instructions

USER MANUAL PLC490 LEXIBOOK

Instruction Manual PLC490Copyright © Lexibook 2003 2Copyright © Lexibook 2003

Congratulations! You have just acquired the PLC490 Maxi Desktop Calculator from Lexibook

This calculator will allow you to perform standard calculations as well as advanced functions such as percentage, memory, tax calculation and corrections to the last 100 calculations. In order to get the most out of your PLC490 calculator, read this instruction manual carefully and keep it in a safe place for future reference.

The “00” key allows you to quickly enter hundreds. Example: Press “5”, then the “00” key and the calculator will display “500”. The “+/-” key allows you to change a positive number to negative, or vice versa. The “ - “ sign appears to the left of the screen when the number displayed is negative. If you repeatedly press the calculation signs (+, -, x, ÷), the calculation will be repeated. For example, if you enter “20 + +”, the calculator will display “40”, which is the result of 20+20. The decimal point selector allows you to select from 0, 2, 4 decimal places, or a floating decimal place (position F), or an automatic conversion to 2 decimal places (position A). The round down/up selector allows you to choose round down to the nearest lower unit (position “ ↓ ”), round up to the nearest higher unit (position “↑”), or a result automatically rounded up/down (position “5/4”). The calculation counter indicator showing the number of calculations carried out appears at the top left of the screen. Calculations are recorded in the memory until you press the “ON/AC” key, or you reach 100 calculations. Press ”ON/AC” in order to delete all calculations stored in the memory. To correct a number, press the “” key until you reach the number you want to enter. To completely delete a number you have just entered, press once on “C/CE”. Calculations IntroductionCopyright © Lexibook 2003

Note: If you have pressed the wrong arithmetic function key (addition, subtraction, multiplication, division), immediately press the correct function key to repair the mistake and proceed with the calculation.

3. Calculations using memory

Before saving a new value to the memory, the content must first be deleted by pressing the 'MRC' key twice and then pressing the 'ON/C' key to delete all previous calculations. To add a value to the memory, enter the chosen number or calculation and then press the 'M+’ key. The result of the calculation is worked out and, if applicable, added to the value in the memory. When 'MEMORY' is displayed, it indicates that a value is stored in the memory. To deduct a value from the memory, enter the chosen number or calculation, and then press the “M-” key. The number entered (or the result of the calculation) is deducted from the value stored in the memory. In order to display the value stored in the memory press “MRC”. To delete the memory content, press twice on “MRC”, the caption “MEMORY” will disappear.

In order to set the tax rate, press the “%/TAX RATE” key for 3 seconds, the default tax rate (5%) will be displayed, then the calculator will display zero. You will be then able to enter the new tax rate and confirm it by pressing again on “%/TAX RATE”. To add the tax Press Display Amount excl. Tax: €20 Tax: 6% Amount incl. Tax= €21.2 20 " TAX + "

To deduct the tax Press Display Amount incl. Tax: €150 Tax: 20% Amount excl. Tax= €125 150 " TAX - "

5. Calculation of the “MU” margin rate

6. Conversion to Euros

In order to display the exchange rate, press “HOME/EXCH RATE”. To modify the exchange rate press “HOME/EXCH RATE” for 3 seconds, enter the new exchange rate and confirm it by pressing again on “HOME/EXCH RATE“.

7. Calculation review “100 STEPS CHECK” & “AUTO REVIEW” “CORRECT”

Calculations can be reviewed step by step. Prior to proceeding with the review of the calculations, the latter must have been finalised. Keys ▼ and ▲ can be used for any calculation: additions, subtractions, multiplications, divisions, percentage, tax calculations, conversion to euros, memories. The ▼ key allows you to go back step by step to the first calculation, whereas the ▲ key takes you step by step to the last calculation. Press on “AUTO REVIEW” for an automatic recall of all last calculations. Press on C/CE to stop the recall and return to the screen before using the ▼ and ▲ keys. To modify a calculation during the review, once the calculator displays the calculation you wish to modify, follow the steps given next:

• Press “CORRECT” again in order to validate the modification. Proceed to the last step in order to check the new result. You can modify as many steps as you wish as long as the “CORRECT” key is pressed once for edit the calculation, and then again to finish editing it. Notes: No additional step can be added while reviewing the calculations. Should an error occur while a calculation is being modified, all steps will be deleted from the memory and it will not be possible to review them. Exchange rate example Press Display Euros / other currency = 6.56 100 HOME HM 656 EURO EU 100 HOME HM 656 Example Press Display Margin from 20 to 120 120 – 20 MU 83.33333 % Rate of 20 % over 200 200 MU 20% 250 Margin rate from 200 to 150 150 – 200 MU - 33.3333 %Copyright © Lexibook 2003

8. Using the results from two calculations: “ANS/CHECK”

Comparing the results from two calculations: The “ANS/CHECK” key allows you to view the result from the one before last calculation, and also that of the last calculation. Make two calculations ending with “=”, then press on “ANS/CHECK“ in order to obtain the result from the one before last calculation, and press once more on “ANS/CHECK“ to get the last calculation. Re-using the result from the last calculation: The calculator will show the message “ERROR” in the following cases. - When dividing by zero - In calculations where the result exceeds the capacity of the calculator. In order to delete the error message and any other calculations, press “ON/C”. Important notes Example Press Display First calculation: 10 + 20 - 5 10 + 20 - 5 = 25 GT Second calculation: 100 -25 100 - ANS/CHECK = 75 GT Example Press Display The one before last calculation: 5 x 10 – 20 = 30 GT The last calculation: 5 x 20 – 20 = 80 GT Bring back the one before last result ANS/CHECK 30 CHECK Bring back the last result ANS/CHECK 80 ANS Example Press Display Calculation made: 20 + 10 – 5 x 2 ÷ 5 Calculation to be amended: 20 -5 -5 x 3 ÷ 5

◗ Your calculator contains precision components, never attempt to take it apart. ◗ Take care not to drop your calculator or allow it to receive any other impacts. ◗ Do not leave your equipment in areas exposed to dampness, dirt, dust or high temperatures. ◗ Make sure your calculator does not come in contact with water or with any other liquid substance; this could produce a short circuit or a potential risk of fire. ◗ Avoid using chemical fluids or petrol to clean the equipment. Wipe it with a dry, soft cloth, or with a cloth moistened with a solution of water and a neutral detergent. ◗ Under no circumstances will the manufacturer and its suppliers be liable to you or any third party for any damages, expenses, lost of profits, lost of earnings, or any other damages arising from any malfunction, repair, or battery replacement. The user should anticipate copies of physical records and data in order to be protected against any possible loss. ◗ Never dispose of batteries, the liquid crystal panel, or other component in a fire. ◗ Should the calculator be exposed to a high electrostatic discharge, the content of the memory could suffer damage or the keys could stop working. ◗ Before assuming malfunction of the equipment, make sure you have read this instruction manual and check that the problem is not caused by the batteries running out or by calculation errors. Power source: 1 AG13 (or LR44) battery and solar cell. Automatic switch off: If no key is pressed, the calculator will switch itself off automatically after approximately 6 minutes. This product is covered by our 2-year warranty. To make use of the warranty or after-sales service, please contact your retailer and supply proof of purchase. Our warranty covers material or installation-related defects attributable to the manufacturer, with the exception of wear caused by failure to respect the instructions for use or any unauthorised work on the equipment (such as dismantling, exposure to heat or damp etc). Note: It is recommended that all packaging be kept for future reference. Keep this instruction manual in a safe place as it contains important information. In our constant concern for improvement, the colours and details of the product may differ slightly from those shown on the packaging. Warranty Features Handling precautionsCopyright © Lexibook 2003

Customer Service: For technical assistance call our freephone helpline: 0808 100 3015 Lexibook UK Limited Unit 10 Petersfield Industrial Estate Bedford Road, Petersfield Hampshire, GU32 3QA United Kingdom Web: http://www.lexibook.com ◗ The contents of this manual are subject to change without notice. ◗ No part of this manual may be reproduced in any form without the express written consent of the manufacturer.Copyright © Lexibook 2003