1. Introduction
Thank you for choosing the OSALO OS-20TV Desktop Calculator. This manual provides detailed instructions for the proper setup, operation, and maintenance of your calculator. Please read this manual thoroughly before use to ensure optimal performance and longevity of your device.
The OSALO OS-20TV calculator on a desk, ready for use.
Key Features:
- Professional Functions: Tax calculation mode, rounding adjustments (round up/cut off), and decimal place settings.
- Efficient Aggregation: Grand Total (GT) function and Memory Continuous Calculation (MRC) for streamlined transaction aggregation.
- Error Correction: Undo function for immediate correction of input errors.
- Ergonomic Design: High-speed response, zero-travel compact keys, and tactile navigation through concave/convex buttons for a smooth input experience, supporting blind touch.
- Clear Display: 12-digit display with operation symbol icons for excellent visibility of complex calculations.
- Dual Power: Solar and battery dual power source ensures uninterrupted operation.
- Durable & Portable: Impact-resistant ABS resin construction, non-slip rubber feet, and an ultra-lightweight 150g design.
- Energy Saving: Automatic power-off after 8 minutes of inactivity to extend battery life.
2. Product Overview
Familiarize yourself with the components of your OSALO OS-20TV calculator.
Detailed diagram of the OSALO OS-20TV calculator's components and key functions.
Key Components:
- Solar Panel: Provides power in well-lit environments.
- Large LCD Display: 12-digit display for clear numerical output and operation symbols.
- Rounding Mode Switch (5/4): Adjusts rounding behavior.
- Decimal Place Setting Switch (F, 4, 2, 0, ADD2): Controls the number of decimal places.
- TAX+ / TAX- Keys: For tax calculations.
- RATE Key: To set the tax rate.
- GT (Grand Total) Key: Accumulates results of multiple calculations.
- MRC (Memory Recall/Clear) Key: Recalls or clears memory content.
- M+ / M- Keys: Adds to or subtracts from memory.
- C (Clear) Key: Clears the last entry.
- AC (All Clear) Key: Clears all entries and memory (except tax rate).
- Arrow Key (Back/Undo): Corrects the last digit entered.
- Non-slip Rubber Feet: Located on the base for stability during use.
The large 12-digit LCD display and solar panel, illustrating the dual power system.
3. Setup
Power Source: Solar and Battery
The OSALO OS-20TV calculator operates on a dual power system, utilizing both solar energy and a built-in battery. This ensures reliable operation in various lighting conditions.
- Solar Power: In well-lit environments, the calculator will primarily use solar power. Ensure the solar panel is exposed to light for optimal performance.
- Battery Power: In low-light conditions or when solar power is insufficient, the calculator automatically switches to battery power. The battery is pre-installed.
Initial Power On
To turn on the calculator, press the AC (All Clear) key. The display will show '0'. If the display remains blank, ensure there is sufficient light for the solar panel or that the battery is functional.
Automatic Power Off
To conserve battery life, the calculator will automatically power off after approximately 8 minutes of inactivity. Press any key to turn it back on.
4. Operating Instructions
Basic Operations
- Power On/All Clear (AC): Press AC to turn on the calculator and clear all previous calculations and memory (except the set tax rate).
- Clear Entry (C): Press C to clear the last entered number or calculation.
- Number Entry: Use the number keys (0-9) to input values. The 00 key allows for quick entry of two zeros.
- Arithmetic Operations: Use +, -, ×, ÷ for addition, subtraction, multiplication, and division. Press = to display the result.
- Decimal Point: Use the . key for decimal numbers.
- Sign Change (+/-): Press +/- to change the sign of the displayed number.
- Percentage (%): Use the % key for percentage calculations.
- Input Correction (Arrow Key): Press the ← (arrow) key to delete the last digit entered.
Advanced Functions
Examples of tax calculation using the dedicated TAX+ and TAX- keys.
- Tax Calculation (TAX+, TAX-):
- Setting the Tax Rate: Press AC. Enter the tax rate (e.g., 8 for 8%). Press RATE. The tax rate is now set.
- Adding Tax: Enter the amount. Press TAX+. The display shows the amount including tax.
- Subtracting Tax: Enter the amount including tax. Press TAX-. The display shows the original amount before tax.
- Calculating Tax Amount: After adding or subtracting tax, press TAX- again to display the tax amount.
- Memory Functions (M+, M-, MRC):
- M+ (Memory Plus): Adds the displayed value to the memory.
- M- (Memory Minus): Subtracts the displayed value from the memory.
- MRC (Memory Recall/Clear): Press once to recall the memory content. Press twice to clear the memory content.
- Grand Total (GT) Function:
The GT key accumulates the results of all calculations performed using the = key. Press GT to display the grand total. Press AC to clear the grand total. - Rounding and Decimal Place Settings:
Use the slide switches located above the number keys to adjust rounding and decimal places.
Rounding (5/4) and Decimal Place (F, 4, 2, 0, ADD2) setting switches.
- Rounding Switch (5/4):
↑ (Round Up): Rounds up the last digit.
5/4 (Round Half Up): Rounds up if the fractional part is 0.5 or greater, otherwise rounds down. - Decimal Place Switch (F, 4, 2, 0, ADD2):
F (Floating Decimal): Displays all digits without rounding.
4, 2, 0: Sets the number of decimal places to 4, 2, or 0 respectively.
ADD2 (Add Mode): Automatically adds two decimal places to all results, useful for currency calculations.
- Rounding Switch (5/4):
Ergonomic Keypad Design
The OSALO OS-20TV features an ergonomic keypad designed for comfort and speed, supporting blind touch operation.
The ergonomic key layout with tactile concave/convex buttons for efficient and fast input.
- Tactile Keys: Concave and convex button shapes provide tactile feedback, allowing for accurate key presses without looking.
- Zero-Travel Design: Compact keys with minimal travel distance enable high-speed response and rapid input.
- Optimized Layout: Number keys are centrally arranged to minimize finger movement, enhancing efficiency for professional users.
5. Maintenance
Proper care and maintenance will ensure the long-term performance of your calculator.
- Cleaning: Use a soft, dry cloth to clean the calculator's surface and display. For stubborn dirt, slightly dampen the cloth with water or a mild, non-abrasive cleaner. Avoid using strong solvents or abrasive materials.
- Avoid Extreme Conditions: Do not expose the calculator to direct sunlight for extended periods, high humidity, extreme temperatures, or strong vibrations.
- Storage: When not in use for a long time, store the calculator in a cool, dry place.
- Battery: The calculator uses a button cell battery (type not specified in product data, typically LR44 or CR2032). If the display becomes dim or unresponsive in low light, the battery may need replacement. Consult a professional or refer to the manufacturer's website for specific battery replacement instructions if needed.
6. Troubleshooting
If you encounter any issues with your OSALO OS-20TV calculator, refer to the following common problems and solutions:
| Problem | Solution |
|---|---|
| Display is blank or dim. | Ensure the solar panel is exposed to sufficient light. If in low light, the battery may be low or depleted. Replace the battery if necessary. |
| Incorrect calculation results. | Check the decimal place and rounding settings. Ensure the tax rate is correctly set if using tax functions. Press AC to clear all previous calculations and memory before starting a new calculation. |
| Keys are unresponsive or sticky. | Clean the keys and surrounding areas with a soft, dry cloth. Avoid spilling liquids on the keypad. |
| Calculator turns off too quickly. | The calculator has an auto-off feature after 8 minutes of inactivity to save power. This is normal operation. |
7. Specifications
Detailed technical specifications for the OSALO OS-20TV calculator.
Dimensions of the OSALO OS-20TV calculator.
| Feature | Detail |
|---|---|
| Model Number | OS-20TV |
| Display Type | LCD |
| Number of Digits | 12 Digits |
| Screen Size | 3.8 inches |
| Power Source | Solar Power & Battery |
| Battery Included | Yes |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Dimensions (L x W x H) | 16.9 x 10.5 x 2.0 cm (6.65 x 4.13 x 0.78 inches) |
| Weight | 170 g |
| Color | OS-20TV (as per product variant) |
| Manufacturer | Osalo Co.,Ltd |
8. Warranty and Support
Warranty Information
This OSALO OS-20TV calculator is covered by a standard manufacturer's warranty against defects in materials and workmanship. The warranty period typically begins from the date of purchase. Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, accidents, unauthorized repairs, or normal wear and tear.
Customer Support
For technical assistance, troubleshooting not covered in this manual, or warranty inquiries, please contact OSALO customer support through the retailer where you purchased the product or visit the official OSALO website for contact details. Please have your model number (OS-20TV) and purchase information ready when contacting support.
