Introduction
This manual provides instructions for the proper use and care of your Sharp EL-250S 8-digit calculator. Please read this manual thoroughly before using the calculator and keep it for future reference.
Features
- 8-digit LCD display
- Solar and battery dual power source
- Basic arithmetic functions: addition, subtraction, multiplication, division
- Percentage calculation
- Tax calculation function (+TAX, -TAX)
- One independent memory (M+, M-, RM, CM)
- Automatic power-off function
Parts Identification
Familiarize yourself with the calculator's layout and key functions.
Figure 1: Front view of the Sharp EL-250S calculator, showing the 8-digit LCD display, solar panel, and various function keys.
- Display: Shows numbers and calculation results.
- Solar Panel: Provides power in well-lit environments.
- Number Keys (0-9): Input numerical values.
- Arithmetic Operation Keys (+, -, ×, ÷): Perform basic calculations.
- Equals Key (=): Completes calculations and displays results.
- Percentage Key (%): Used for percentage calculations.
- Tax Keys (+TAX, -TAX): For adding or subtracting tax.
- Memory Keys (M+, M-, RM, CM): Store and recall values from memory.
- Clear Keys (CA, C·CE): Clear all entries (CA) or clear the last entry (C·CE).
- ON Key: Turns the calculator on.
Setup
Power Source
The Sharp EL-250S calculator operates on a dual power system: solar power and a single LR44 button cell battery. In well-lit conditions, the calculator primarily uses solar power. In dim lighting or when solar power is insufficient, it automatically switches to battery power.
Battery Installation/Replacement
- Ensure the calculator is turned off.
- Locate the battery compartment cover on the back of the calculator.
- Using a small screwdriver, carefully remove the screw securing the battery compartment cover.
- Remove the cover.
- Remove the old LR44 battery (if replacing).
- Insert a new LR44 battery with the positive (+) side facing up.
- Replace the battery compartment cover and secure it with the screw.
Note: Dispose of used batteries according to local regulations. Do not mix old and new batteries.
Operating Instructions
Turning On/Off
- Press the ON key to turn the calculator on.
- The calculator will automatically turn off after approximately 7-10 minutes of inactivity to conserve power.
Basic Arithmetic Calculations
- Addition: Enter the first number, press +, enter the second number, press =.
- Subtraction: Enter the first number, press -, enter the second number, press =.
- Multiplication: Enter the first number, press ×, enter the second number, press =.
- Division: Enter the first number, press ÷, enter the second number, press =.
Percentage Calculations
To calculate a percentage of a number (e.g., 10% of 200):
- Enter 200.
- Press ×.
- Enter 10.
- Press %. The result (20) will be displayed.
Memory Functions
- M+: Adds the displayed value to the memory.
- M-: Subtracts the displayed value from the memory.
- RM (Recall Memory): Recalls the value stored in memory to the display.
- CM (Clear Memory): Clears the memory content. Pressing RM after CM will display 0.
Tax Calculation
The calculator features dedicated keys for tax calculations. First, set the tax rate:
- Press RATE SET.
- Enter the tax rate (e.g., 5 for 5%).
- Press SET.
To perform tax calculations:
- +TAX: Adds tax to the displayed value.
- -TAX: Subtracts tax from the displayed value.
Maintenance
- Cleaning: Wipe the calculator with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the calculator in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery: If the calculator is not to be used for an extended period, remove the battery to prevent leakage.
- Avoid Impact: Protect the calculator from drops and strong impacts.
Troubleshooting
| Problem | Solution |
|---|---|
| Display is blank or dim. | Ensure sufficient light for solar power. Replace the LR44 battery if necessary. |
| Incorrect calculation results. | Press CA to clear all entries and memory, then re-enter the calculation. Check for correct key presses. |
| Keys are unresponsive. | Check battery power. Clean around keys if debris is present. Avoid operating in extreme temperatures. |
| "E" or "Error" displayed. | Indicates an overflow or mathematical error (e.g., division by zero). Press CA to clear. |
Specifications
- Model: EL-250S
- Display: 8-digit LCD
- Power Source: Solar and 1 x LR44 battery
- Dimensions: 7.1 cm (W) x 11.5 cm (D) x 1.6 cm (H)
- Weight: Approximately 58 grams
- Functions: Basic arithmetic, percentage, tax calculation, memory
Figure 2: Top view of the Sharp EL-250S calculator, illustrating its dimensions of 11.6 cm in height and 7.1 cm in width.
Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or visit the official Sharp website. Keep your purchase receipt as proof of purchase.