LEXIBOOK PLC490 User manual

Instruction Manual
PLC490

Copyright © Lexibook 2003
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Copyright © Lexibook 2003 3
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.
1. Keys
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
Introduction

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2. Percentage calculations
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.
4. Tax calculations
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 + " 21.2
To deduct the tax Press Display
Amount incl. Tax: €150
Tax: 20%
Amount excl. Tax= €125
150 " TAX - " 125
To calculate Press Display
20€+ 6% tax = 21.2€20 + 6 % 21.2
150€minus 20% = 120€150 – 20 % 120

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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 on “CORRECT”
•Enter the new value or press the new calculation key or both.
•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 %

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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
▼
▼
CORRECT
- 5
▼
▼
3
CORRECT
▼
▼
20 REV
+ 10 REV
+ 10 CRT
- 5 CRT
- 5 CRT
x 2 CRT
x 3 CRT
x 3 REV
÷5REV
= 6 REV

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◗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 precautions

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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 9
Félicitations! Vous venez d’acquérir la calculatrice bureau grand format PLC490 de
Lexibook®.
Cette calculatrice vous permettra d’effectuer les opérations courantes, ainsi que les
fonctions plus avancées comme pourcentages, mémoire, taxes, correction sur les 100
dernières opérations.
Pour utiliser la calculatrice bureau grand format PLC490 au mieux, lisez ce mode d’emploi
avec attention et gardez-le dans un endroit sûr pour toute consultation ultérieure.
1. Touches
La touche " 00 " permet d’obtenir les centaines rapidement. Exemple : tapez " 5" puis
touche " 00 " et la calculatrice affiche " 500 ".
La touche " +/- " permet de changer un nombre positif en négatif, ou négatif en
positif. Le signe " -" apparaît sur la gauche de l’écran lorsqu’un nombre est négatif.
Si vous appuyez plusieurs fois sur les signes d’opération (+, -, x, ÷), le calcul se
répètera. Par exemple, si vous entrez " 20 + + ", la calculatrice affichera " 40 " qui est
le résultat de 20 + 20.
Le sélecteur de position de la virgule permet de choisir une décimale de 0, 2, 4
chiffres, ou une décimale flottante (position F), ou une décimale automatiquement à
position 2 (position A).
Le sélecteur d’arrondissement permet de choisir un arrondissement à l’unité
inférieure (position " ↓"), à l’unité supérieure (position " ↑"), ou un résultat
automatiquement arrondi (position " 5/4 ").
L’indicateur du nombre d’opérations apparaît en haut à gauche de l’écran, il
montre le nombre d’opérations effectuées. Les opérations sont enregistrées dans la
mémoire jusqu’à ce que vous appuyez sur " ON/AC " ou jusqu’à 100 opérations. Pour
effacer toutes les opérations en mémoire, appuyez sur " ON/AC ".
Pour corriger un chiffre, appuyez sur la touche " " jusqu’au chiffre que vous
voulez entrer. Pour effacer complètement un nombre que vous venez juste d’entrer,
appuyez une fois sur la touche " C/CE ".
Calculs
Introduction

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2. Calcul de pourcentage
Note : si vous avez appuyé sur la mauvaise touche de fonction arithmétique
(addition, soustraction, multiplication, division), appuyez immédiatement sur
la bonne touche de fonction pour corriger l’erreur et continuer l’opération.
3. Calcul avec mémoire
Pour sauvegarder une valeur en mémoire, effacez tout d’abord le contenu de la
mémoire en appuyant deux fois sur " MRC " puis appuyez sur " ON/C " pour effacer
tous les calculs précédents.
Pour faire une addition à la valeur en mémoire, entrez le nombre ou le calcul désiré
puis appuyez sur la touche " M+ ". Le résultat de l’opération est calculé si c’est le cas
et additionné à la valeur en mémoire.
Lorsque la mention " MEMORY " apparaît, elle indique une valeur en mémoire.
Pour faire une soustraction à la valeur en mémoire, entrez le nombre ou le calcul
désiré puis appuyez sur " M - ". Le nombre entré (ou le résultat de l’opération) est
soustrait de la valeur en mémoire.
Pour afficher la valeur en mémoire, appuyez sur " MRC ". Pour effacer le contenu de
la mémoire, appuyez deux fois sur " MRC ", la mention " MEMORY " disparaît.
4. Calcul de taxes
Pour fixer le taux de taxes, pressez la touche " %/TAX RATE" pendant 3 secondes,
le taux de taxe par défaut s’affichera (5%) puis zéro s’affichera, vous pourrez
alors entrer le nouveau taux de taxe puis confirmer en appuyant de nouveau sur
" % / TAX RATE".
Pour ajouter la taxe Appuyez sur Affichage
Montant hors taxes : 20€
Taxe : 6%
Montant toutes taxes = 21.2€
20 " TAX + " 21.2
Pour soustraire la taxe Appuyez sur Affichage
Montant toutes taxes : 150€
Taxe : 20%
Montant hors taxes = 125€
150 " TAX - " 125
Pour calculer Appuyez sur Affichage
20€+ taxe de 6% = 21.2€20 + 6 % 21.2
150€moins 20% = 120€150 – 20 % 120