CASIO S-20L / S-2 Calculator: Operating Instructions

General Precautions

To ensure a long service life for your calculator, do not touch its internal parts, subject it to strong impacts or drops, or press the keys too hard. Very low (below 0°C) and very high (above 40°C) temperatures, as well as high humidity, can negatively affect your calculator's operation. Never use volatile liquids such as nail polish remover, gasoline, etc., for cleaning the device. For technical maintenance, contact the store where you purchased the calculator or the nearest CASIO dealer.

1. General Guidance

Key Functions

• M+: Key for adding to memory (subtracting from memory)
• MR: Key for recalling from memory
• MC: Key for clearing memory
• →: Shift key
• ±: Sign change key
• √: Square root key
• %: Percentage calculation key
• Δ%: Percentage change calculation key
• C: Clear key (clears current entry)
• AC: All clear key (clears all)

Decimal Point Setting Switch

This switch controls the decimal point representation:

• F [Floating Decimal Point]: Uses a floating decimal point. The overflow protection system prevents loss of significant digits.
• CUT [Truncation]: The result is automatically truncated to the specified number of decimal places (indicated by the decimal point position switch described below). Intermediate results use floating point.
• UP [Round Up]: The result is automatically rounded up in the same manner as described above.
• 5/4: The result is rounded down in the same manner as described above.

Decimal Point Position Switch

This switch automatically sets the decimal point position to 0, 1, 2, 3, 4, or 6.

In the ADD (2) [Addition (2)] position, you can enter decimal fractions without pressing the decimal point key, and the decimal point will be automatically displayed in the 2nd position. If you press the key, the decimal point will be displayed in its logical position. Note that calculations cannot be performed in the "ADD" mode if the decimal point setting switch is in the "F" position.

2. Power Source

This calculator operates on dry batteries that cannot be recharged, or from AC mains via an AC adapter.

Dry Battery Usage

S-20L: Using two D-size ("SUM-1") dry manganese batteries allows for approximately 8 hours of continuous operation. When the batteries are depleted, the display will darken.

S-2: Using four AA-size ("UM-3") dry manganese batteries allows for approximately 15 hours of continuous operation (20 hours with "SUM-3" type batteries). When the batteries are depleted, the display will darken and/or an "E" indicator will appear in the leftmost column of the display.

When the above signs of low power appear, the batteries must be replaced. Remember to turn off the calculator before replacing batteries.

Slide open the battery compartment cover on the back of the unit, remove old batteries, and insert new ones, observing polarity according to the markings.

Battery Precautions

Improper use of batteries can lead to leakage or explosion, potentially damaging the unit. Observe the following precautions:

1. When installing batteries, ensure their positive [+] and negative [-] poles are installed in the correct direction.
2. Do not mix batteries of different types.
3. Do not mix old and new batteries.
4. Never leave discharged batteries in the battery compartment. This can lead to malfunctions.
5. If you do not use the calculator for an extended period, remove the batteries from the compartment.
6. To prevent possible failures, it is recommended to replace batteries at least once every 2 years.
7. The supplied batteries cannot be recharged.
8. Avoid direct heating of batteries, do not disassemble them, and do not short-circuit their terminals. (If a battery leaks, immediately clean the calculator's battery compartment. Be careful not to get battery fluid on your skin).

AC Adapter Usage

To avoid damaging your calculator, use only the AC adapter (for S-20L - AD-4150, for S-2 - AD-4145) that indicates the same voltage as your AC mains (220 or 240 V).

Insert the AC adapter plug into the outlet, and connect the other end of the cord to the unit. Power from batteries is automatically disconnected.

ONLY USE A CASIO AC ADAPTER TO POWER YOUR CALCULATOR. USING ANOTHER ADAPTER MAY DAMAGE YOUR CALCULATOR.

Batteries may explode in the following cases:

1. Using an AC adapter other than a genuine CASIO adapter.
2. Incorrect battery polarity [+,-].

3. Overflow and Error Control

If overflow or an error occurs, an 'E' indicator appears in the left corner of the display, and further calculations stop.

Overflow Occurs in the Following Cases:

1. When attempting to enter an integer consisting of more than 12 digits.
2. When the integer part of a result (intermediate or final) consists of more than 12 digits. However, the display shows 12 significant digits of the result, and the decimal point indicates its true decimal position (12 digits to the right).
3. When the integer part of a value stored in memory consists of more than 12 digits.
4. When attempting to take the square root of a negative number. However, the answer is given with a minus sign.

To release locked registers, press the AC key.

In cases 2) and 4), you can also release register lock by pressing the C or ± key. The value displayed can then be used for further calculations. In case 1), you can use the displayed value by releasing the locked register by pressing the C key.

4. Technical Specifications

Calculation Examples

Power Source Details

AC Power: 220 V or 240 V [+10 V], 50/60 Hz via AC adapter (for S-20L - AD-4150, for S-2 - AD-4145); DC Power: 4.5 V with rounded negative terminal.

DC Power:

• S-20L: Uses two D-size ("SUM-1") dry manganese batteries, providing approximately 8 hours of continuous operation.
• S-2: Uses four AA-size ("UM-3") dry manganese batteries, providing approximately 15 hours of continuous operation (20 hours with "SUM-3" type batteries).

Operating Temperature Range: 0°C to 40°C

Dimensions:

• S-20L: 41.5 (H) x 159.5 (W) x 200.5 (D) mm
• S-2: 45 (H) x 133 (W) x 170.5 (D) mm

Weight:

• S-20L: 520 g
• S-2: 360 g (with batteries)

Square Root Calculation

Example: √3 = 1.73205080756

Example: √8×4.5 = 6.00

Memory Calculations

(Note: Press MC before starting memory calculations.)

Example: 53×6 = 318; 23×8 = 184; 56×2 = 112; 99+4 = 24.75. Total = 270.75

Example: 7+7-7+(2×3)+(2×3) = 19

Basic Calculations

Example: (12+3)×89+7 = 190.714285714

Example: 7894÷6 = 1315.66666666

Example: 5×(-8)+4 = -10

ADD Mode Calculations

Example: 23.56 + 45.78 - 12.45 + 96.32 = 153.21 (using ADD2 setting)

Constant Calculations

Example: 2.3 × 12 = 27.6

Example: 4.5 × 12 = 54

Example: 2.5² = 6.25

Example: 2.5³ = 15.625

Example: 2.5⁴ = 39.0625

Example: 12÷45 = 0.45614035087

Percentage Calculations

Example: 12% of 1500 = 180

Example: 660 is what % of 880 = 75%

Example: 15% markup on 2500 = 2875

Example: 25% discount on 3500 = 2625

Markup Calculation

What should be the selling price and profit if the purchase price is $480 and the markup is 25%?

Selling Price: $640

Profit: $160

Markdown Calculation

What should be the contract price and loss if an item costing $130 is sold with a 4% markdown?

Contract Price: $125

Loss: $5

Profit/Loss Calculation

What is the percentage increase in income if last week's income was $80 and this week's is $100?

Percentage Increase: 25%

Product Information