Casio DE-12E User manual

1
EN
DE-12E
JE-12E
User’s Guide

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• Be sure to keep all user documentation handy for future reference.
• In this User’s Guide, some key notations are shown in simplified
form.
l
C1
➞lor B

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Safety Precautions
Thank you for purchasing this CASIO product.
Be sure to read the “Safety Precautions” before using this product
to ensure that you use it correctly. Be sure to keep all user
documentation handy for future reference.
Danger
Indicates something that creates the major risk of death or
serious personal injury.
kButton Type and Coin Type Battery
Precautions
Take care to ensure that a battery will not be
swallowed accidentally.
Particular care is required to keep batteries away from
children.
Should a battery be swallowed accidentally or if there is a
possibility that a battery has been swallowed, immediately contact
a physician.
Swallowing a battery can result in chemical burns, mucosal tissue
penetration, and other serious problems that create the risk of
death.

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Warning
Indicates something that creates the risk of death or
serious personal injury.
kDisplay Screen
Do not press the LCD or subject it to strong impact.
Doing so can cause the LCD glass to crack, creating
the risk of personal injury.
Should the LCD become cracked, never touch any of
the liquid inside.
LCD liquid getting on the skin creates the risk of skin irritation.
Should LCD liquid get into your mouth, immediately rinse your
mouth out and contact your physician.
Should LCD liquid get in your eyes or on your skin, rinse with clean
water and then contact your physician.
kBattery Precautions
Should fluid leaking from a battery get on your skin or
clothing, immediately rinse it off with clean water.
Battery fluid getting into the eyes creates the risk of eyesight loss,
etc. Rinse the eyes and then immediately contact a physician.

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Caution
Indicates something that creates the risk of minor personal
injury or physical damage.
Observe the precautions below. Failure to do so can cause a
battery to rupture, creating the risk of fire, personal injury, and
soiling of nearby objects by leaking fluid.
• Do not try to take a battery apart and never allow a
battery to become shorted.
• Do not charge a non-rechargeable battery.
• Do not expose a battery to heat or throw it into fire.
• Use only the specified type of battery.
• Load a battery with its poles (plus (+) and minus (–))
facing correctly.
• Replace the battery as soon as possible after it goes
dead.
Battery Precautions
Observe the precautions below. Failure to do so can
cause the battery to explode or leak flammable liquid
or gas.
• Use only the type of battery that is specified for this product.
• Do not burn a battery or dispose of it in an incinerator, or by
mechanical crushing or cutting.
• Do not subject a battery to excessively high or low temperatures
during use, storage, or transport.
• Do not subject a battery to excessively low barometric pressure
during use, storage, or transport.

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Important Precautions
• If you suspect that the calculator is operating abnormally due to
static electrical charge or some other problem, press Ato restore
normal operation.
• Avoid dropping the calculator and otherwise subjecting it to severe
impact.
• Never try to take the calculator apart.
• Never bend or twist the case.
• Wipe the unit with a soft, dry cloth to clean it.
• Replacing the battery or blocking the calculator from sunlight while
battery power is low may cause your tax rate setting, currency
conversion rate setting, or memory contents to be changed or lost.
Replace the battery as soon as possible when it becomes weak
and correct the rate setting, if necessary.
• The contents of these instructions are subject to change without
notice.
• CASIO COMPUTER CO., LTD. assumes no responsibility for any
loss or claims by third parties which may arise from the use of this
product.

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Contents
Safety Precautions ······························································· 3
Important Precautions ·························································· 6
Power Supply ······································································· 8
Basic Calculations ································································ 9
Tax Calculations ································································· 12
Currency Conversion·························································· 13
Specifications ····································································· 15
Battery Replacement ························································· 15

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Power Supply
Two-Way Power System provides power even in complete darkness.
• Even if you do not use the calculator, you should replace the battery
at least once every seven years.
• The replace battery icon ( ) will appear in the lower right corner
of the display when battery power is low.
• If the display becomes dim and difficult to read, or if nothing
appears on the display when you press A(especially when
lighting is dim), you probably need to have the battery replaced.
• The battery that comes with this unit discharges slightly during
shipment and storage. Because of this, it may require replacement
sooner than the normal expected battery life.
kAuto Power Off Function
Auto power off: Approximately 6 minutes after last key operation
• If the Auto Power Off function turns off power, press Ato restore
power.

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Basic Calculations
4 3 2 1 0
ADD
2
5
CUT
F5/4
UP
4 3 2 1 0
ADD 2
CUT
F5/4
(DE-12E)
(JE-12E)
“F” A0.
6 ÷3 ×5 + 2.4 – 1 = 11.4 6/3*5+2.4-1=11.4
2 ×(– 3) = – 6 2*3>=– 6.
5 ÷3 = 1.66666666… “F” 5/3=1.66666666...
“CUT, 2” 5/3=1.66
“UP, 2” (DE-12E) 5/3=1.67
“5/4, 2” 5/3=1.67
$1.23 “CUT, ADD2” 123+1.23
3.21 321-4.44
–1.11 111+3.33
2.00 2.= 5.33
$5.33
12 + 23 = 35 “F” 23++12= K 35.
45 + 23 = 68 45= K 68.
7 – 5 = 2 5--7= K 2.
2 – 5 = – 3 2= K – 3.
2 × 12 = 24 12**2= K 24.
4 × 12 = 48 4= K 48.
45 ÷ 9 = 5 9//45= K 5.
72 ÷ 9 = 8 72= K 8.

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'4 × 5 = 10 “F” 49*5=10.
200 ×5% = 10 “F” 200*5&10.
100 + (100 ×5%) = 105 “F” 100*5&+ 105.
500 – (500 ×20%) = 400 “F” 500*20&- 400.
30 = 60 ×?% ? = 50 “F” 30/60&50.
12 = 10 + (10 ×?%) ?= 20 “F” 12-10&20.
100% 25%
$120
? ($160)
? ($40) “F” 120+25&
-
160.
40.
8 ×9 = 72 “F” (m)*1o8*9l
M 72.
–) 5 ×6 = 30 5*6m
M 30.
2 ×3 = 6 2*3l
M 6.
48 n M 48.
5 ×6 = 30 “F” A5*6=
GT 30.
2 ×8 = 16 2*8=
GT 16.
46 &*2 GT 46.
12 ÷ 2 = 6
“F” (m)*1
Ao12l/2=
GT M 6.
12 ÷ 5 = 2.4 n/5= GT M 2.4
12 ÷ 8 = 1.5 n/8= GT M 1.5
9.9 & GT M 9.9
7.8 ×89 = 694.2
“F” (m)*1
Ao7.8l*89=
GT M 694.2
4.56 × 23 = 104.88 4.56l*23=
GT M 104.88
12.36 799.08 n GT M 12.36
&
GT M 799.08
*1If the “EXCH” indicator is displayed, press mand confirm that
“EXCH” is not displayed.
*2&recalls the value stored (accumulated) in grand total memory.

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2 + / 3 = 6
4“F” 2+3C4=6.
2 / + 7 = –5
–
2+-7=– 5.
5 + 7/ 7 = 12 5+77'= 12.
• “E” (Error) will appear if the calculation result exceeds the upper
calculation limit of the calculator. If this happens, press A.
• The value displayed when a calculation error occurs is a rough
approximate value.
Example: If 1.23 is displayed along with “E”, it indicates a value of
approximately 1.23 × 1012.
kClearing Calculations
• To clear the calculator except for independent memory and rate
settings, press A.
• To clear independent memory only, press o.

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Tax Calculations
• To set a tax rate
Example: Tax rate = 5%
Ah(Hold down until SET appears.)
m5 h
• You can check the currently set tax rate by pressing Aand then
m.
• Tax rate = 5%
$150*3➞???*4*5
“F”
$105*4➞???*3*5
“F”
*3Price-less-tax
*4Price-plus-tax
*5Tax
%
TAX
5.
*4*
5
A
150
V
V
TAX+
157.5
TAX
7.5
*3*
5
A
105
W
W
TAX−
100.
TAX
5.

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Currency Conversion
• To toggle between the Memory Mode (A) and the
Conversion Mode (B)
• To set conversion rates
Currency 1 (C1) is your home country currency, and so it is always
set to 1. Currency 2 (C2), Currency 3 (C3) and Currency 4 (C4)
are for three other currencies, and you can change these rates as
required.
Example: Conversion rate $1 (C1 home currency) = 0.9 euro for
Currency 2 (C2)
Ah(Hold down until SET appears.)
C0.9*6h
• You can check a currently set conversion rate by pressing Aand
then, C, D, or b.
*6For rates of 1 or greater, you can input up to six digits. For rates
less than 1 you can input up to your calculator’s maximum number
of digits, including 0 for the integer digit and leading zeros (though
only six significant digits, counted from the left and starting with the
first non-zero digit, can be specified).
Examples: 0.123456, 0.0123456
EXCH
0.
(A) (B)
m
EXCH
000000000000.
EXCH RATEC2
0.9

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Conversion Rate Setting
C1 ($) = 1, C2 (EUR) = 0.9, C3 (GBP) = 0.75
108 EUR ➞$ ? (120)
“F” (m)*7A108 CB
C
$110 ➞GBP ? (82.5)
“F” (m)*7A110 BD
B
108 EUR ➞GBP ? (90)
“F” (m)*7A108 CD
C
*7If there is no “EXCH” indicator displayed, press mto display it.
Conversion Calculation Formulas
C2 ➞C1 ... A/X
C3 ➞C1 ... A/Y
C4 ➞C1 ... A/Z
C1 ➞C2 ... A`X
C1 ➞C3 ... A`Y
C1 ➞C4 ... A`Z
C2 ➞C3 ... (A/X)`Y
C2 ➞C4 ... (A/X)`Z
C3 ➞C2 ... (A/Y)`X
C3 ➞C4 ... (A/Y)`Z
C4 ➞C2 ... (A/Z)`X
C4 ➞C3 ... (A/Z)`Y
• A = Input or displayed value, X= C2 rate, Y= C3 rate, Z= C4 rate
C1 EXCH
120.
C2 EXCH
108.
C3 EXCH
82.5
C1 EXCH
110.
C3 EXCH
90.
C2 EXCH
108.

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Specifications
Power Supply: Two-Way Power System, with solar cell and one
button type battery (CR2025)
Battery Life: Approximately 7 years (1 hour operation per day)
Operating Temperature: 0°C to 40°C (32°F to 104°F)
Dimensions (H) × (W) × (D) / Approximate weight (including
battery):
DE-12E: 35×140×188 mm (13/8”× 51/2”×77/16”) / 295 g (10.4 oz)
JE-12E: 24.4×111×177.5 mm (15/16”×43/8”×7”) / 210 g (7.4 oz)
Battery Replacement

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SA2210-A
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CASIO COMPUTER CO., LTD.
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Shibuya-ku, Tokyo 151-8543, Japan