1. Introduction
Thank you for choosing the OSALO FQ-450 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 the device. Keep this manual for future reference.
2. Product Overview
2.1 Key Features
- Extra-Large 12-Digit LCD Display: Provides clear visibility of numbers and operation symbols.
- Large, Ergonomic Buttons: Concave, round buttons designed for comfortable and accurate input, reducing typing errors.
- Dual Power Source: Operates on both solar energy and a pre-installed L1154F battery, ensuring continuous functionality.
- Durable Construction: Made from high-quality metal and plastic materials for extended use.
- Anti-Slip Design: Equipped with anti-slip mats for stability during use.
- 30-Degree Angled Display: Optimized viewing angle for improved readability and comfort.
2.2 Component Identification
Familiarize yourself with the various parts of your OSALO FQ-450 calculator:
- Extra Large Display: Shows up to 12 digits and operation symbols.
- GT (Grand Total): Displays the grand total of all calculations.
- Back Space (◀): Deletes the last entered digit.
- AC (All Clear): Clears all entries and calculations.
- 00 (Double Zero): Enters two zeros simultaneously.
- Solar Panel: Provides power in well-lit conditions.
- √ (Square Root): Calculates the square root of a number.
- MR/MC (Memory Recall/Clear): Recalls the value stored in memory or clears the memory.
- M+/M- (Memory Plus/Minus): Adds to or subtracts from the memory.
- C/CE (Clear Entry): Clears the last entry without affecting previous calculations or memory.
- % (Percentage): Performs percentage calculations.
- MU (Mark-Up): Used for mark-up calculations.
3. Setup
3.1 Power Source
The OSALO FQ-450 calculator features a dual power system: solar and battery. It automatically switches between power sources depending on the light conditions.
- Solar Power: The calculator will operate using solar power when sufficient light is available. Ensure the solar panel (6) is exposed to light.
- Battery Power: An L1154F battery is pre-installed. The calculator will use battery power in low-light conditions or when solar power is insufficient. The battery typically lasts for approximately 2 years with one hour of continuous use per day.
3.2 Initial Use
No specific setup is required for initial use. Simply ensure the calculator is in a well-lit area or has a functional battery. The calculator will power on automatically when a button is pressed.
4. Operating Instructions
4.1 Basic Calculations
To perform basic arithmetic operations:
- Enter the first number.
- Press the desired operation key (+, -, ×, or ÷). The operation symbol will appear on the display.
- Enter the second number.
- Press the = key to display the result.
4.2 Clearing Entries and All Clear
- Press C/CE to clear the last entered number or operation. This allows correction without restarting the entire calculation.
- Press AC to clear all entries, operations, and memory contents, resetting the calculator to its initial state.
4.3 Memory Functions
The calculator includes memory functions for storing and recalling values:
- M+: Adds the displayed value to the memory.
- M-: Subtracts the displayed value from the memory.
- MR: Recalls the value currently stored in memory to the display.
- MC: Clears the memory content. (Often combined with MR, pressing MR twice or a dedicated MC button).
4.4 Special Functions
- GT (Grand Total): After a series of calculations, pressing GT will display the sum of all results.
- % (Percentage): For percentage calculations. Example: To calculate 10% of 200, enter 200 × 10 %, the result will be 20.
- √ (Square Root): Enter a number, then press √ to find its square root.
- MU (Mark-Up): Used for calculating selling prices based on cost and desired profit margin.
5. Maintenance
5.1 Cleaning
To maintain the calculator's appearance and functionality:
- Wipe the calculator with a soft, dry cloth.
- For stubborn dirt, slightly dampen the cloth with water and mild soap, then wipe dry immediately.
- Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the surface and internal components.
5.2 Battery Replacement
When the display becomes dim or unresponsive in low light, it may be time to replace the L1154F battery.
- Turn the calculator over.
- Locate the battery compartment cover.
- Carefully remove the cover (a small screwdriver may be needed).
- Remove the old battery and insert a new L1154F battery, ensuring correct polarity (+/-).
- Replace the battery compartment cover securely.
5.3 Storage
Store the calculator in a cool, dry place away from direct sunlight and extreme temperatures. Avoid placing heavy objects on top of the calculator.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Insufficient light for solar power, or low battery. | Move to a brighter area or replace the L1154F battery. |
| Incorrect calculation results. | Incorrect key input, or memory not cleared. | Press AC to clear all and restart calculation. Double-check input. Clear memory with MC if necessary. |
| Keys are unresponsive. | Calculator may be frozen or battery is completely drained. | Try pressing AC. If unresponsive, replace the battery. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | OSALO |
| Model Name | FQ-450 |
| Display Digits | 12 Digits |
| Screen Size | 6 Inches |
| Color | White/Silver |
| Power Source | Solar and Battery (L1154F included) |
| Battery Composition | Alkaline |
| Material | Plastic, Metal |
| Product Dimensions | 17L x 16.7W centimeters (approx. 6.7 x 6.6 inches) |
8. Warranty and Support
8.1 Warranty Information
OSALO products are manufactured to high-quality standards. For specific warranty details, please refer to the packaging or contact OSALO customer support directly. Keep your purchase receipt as proof of purchase for any warranty claims.
8.2 Customer Support
If you encounter any issues or have questions not covered in this manual, please contact OSALO customer support. Contact information can typically be found on the product packaging or the official OSALO website.
