1. Introduction
This manual provides detailed instructions for the proper setup, operation, and maintenance of your Casio HR-300RC Printing Calculator. Designed for personal, business, and office use, this calculator features a backlit LCD display, 2-color printing, and advanced functions like Cost/Sell/Margin calculations, tax functions, and a re-print/correct feature for up to 150 steps. Please read this manual thoroughly to ensure optimal performance and longevity of your device.
Figure 1: Casio HR-300RC Printing Calculator, showing the backlit display and paper output.
2. Setup
2.1 Power Supply
The Casio HR-300RC operates using an AC adapter (included). Connect the AC adapter to the calculator's power input jack and then to a standard electrical outlet. This calculator does not support battery power for operation.
2.2 Paper Roll Installation
- Open the paper roll cover located at the top rear of the calculator.
- Insert a new paper roll (58mm wide thermal paper) into the compartment, ensuring the paper feeds from the bottom of the roll.
- Pull approximately 1-2 inches of paper out past the cutting edge.
- Close the paper roll cover securely.
2.3 Ink Roller Installation/Replacement
- Ensure the calculator is turned off and unplugged.
- Gently lift the printer cover.
- If replacing, remove the old ink roller by pulling it upwards.
- Insert the new ink roller, ensuring it clicks into place. Avoid touching the ink ribbon directly.
- Close the printer cover.
Figure 2: Front view of the Casio HR-300RC, highlighting the keypad and display.
3. Operating Instructions
3.1 Basic Operations
- Power ON/OFF: Press the ON/CA button to turn on the calculator. Press OFF to turn it off.
- Number Entry: Use the numeric keypad (0-9, 00).
- Decimal Point: Use the . key.
- Addition (+), Subtraction (-), Multiplication (×), Division (÷): Use the respective operation keys.
- Equals (=): Press the = key to display the result of a calculation.
- Clear Entry (CE): Clears the last entered number.
- All Clear (AC): Clears all entries and resets the calculator.
3.2 Special Functions
- Cost/Sell/Margin (CSM): Dedicated keys (COST, SELL, MAR) simplify profit and pricing analysis. Enter two values to calculate the third.
- Tax Calculation (TAX+, TAX-): Allows for quick addition or subtraction of a pre-set tax rate. Set the tax rate using the SET button and the % key.
- Re-Print & Correct Function: The calculator stores up to 150 steps. Use RE-PRINT to print the calculation history and CORRECT to edit entries within the history before reprinting.
- Time & Date Stamp: Built-in clock and calendar functions allow you to print the current date and time directly on the calculation tape. Refer to the full user guide for setting the time and date.
- 2-Color Printing: Negative values are printed in red, and positive values in black, enhancing readability and helping to prevent errors.
4. Maintenance
4.1 Cleaning
To clean the calculator, wipe the exterior with a soft, dry cloth. For stubborn dirt, use a cloth lightly dampened with water and a mild detergent, then wipe dry immediately. Do not use abrasive cleaners, solvents, or spray directly onto the calculator.
4.2 Storage
Store the calculator in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity. When not in use for extended periods, unplug the AC adapter.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Calculator does not turn on. | AC adapter not connected or faulty. | Ensure AC adapter is securely plugged into the calculator and a working power outlet. |
| Printer does not print. | Paper roll empty or incorrectly installed; Ink roller dry or incorrectly installed. | Replace paper roll or re-install correctly. Replace ink roller. Ensure print mode is enabled. |
| Display is dim or unreadable. | Power issue; Backlight setting. | Check power connection. The backlit LCD display is always on when powered. If dim, contact support. |
| Incorrect calculation results. | Incorrect input; Mode setting. | Clear all entries (AC) and re-enter calculation. Verify correct mode (e.g., tax rate setting). |
If the problem persists after attempting these solutions, please refer to the comprehensive user guide PDF or contact Casio customer support.
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | HR-300RC |
| Product Dimensions | 10.2 x 7.68 x 2.39 inches |
| Item Weight | 1.37 pounds |
| Calculator Type | Printing |
| Power Source | AC Adapter (included) |
| Screen Type | Backlit LCD Display |
| Screen Size | 2 Inches (diagonal) |
| Printing Colors | Black and Red |
| Check & Correct Steps | Up to 150 steps |
7. Warranty and Support
Casio products are manufactured to high-quality standards. For detailed warranty information, please refer to the warranty card included with your product or visit the official Casio website. For further assistance, technical support, or to download the complete user guide, please visit the Casio support page or contact their customer service department.
You can also find the official User Guide (PDF) here.