Casio D21
Casio HR-8RC-BK Printing Calculator User Manual
Model: HR-8RC-BK | Brand: Casio
1. Introduction
Thank you for choosing the Casio HR-8RC-BK 150 Steps Check & Correct Printing Calculator. This manual provides detailed instructions on how to set up, operate, and maintain your new calculator to ensure optimal performance and longevity. Please read this manual thoroughly before using the product.
What's in the Box
- 1 x Casio HR-8RC-BK Printing Calculator
- 1 x User Manual
- 1 x Warranty Term Sheet
- Warranty Serial number sticker
- E-waste leaflet
- 1 x Paper Roll
- 4 x Battery

Figure 1.1: Casio HR-8RC-BK Printing Calculator with paper roll.
2. Setup
2.1 Battery Installation
The calculator requires 4 batteries for operation. Locate the battery compartment on the underside of the calculator. Open the cover, insert the batteries according to the polarity indicators (+/-), and then close the cover securely.
2.2 Paper Roll Installation
To install the paper roll, open the paper roll cover located at the top rear of the calculator. Place the paper roll into the compartment, ensuring the paper feeds from the bottom of the roll. Thread the leading edge of the paper through the printer slot until it emerges from the front. Close the paper roll cover.

Figure 2.1: Side view illustrating the paper roll compartment and dimensions.
3. Operating Instructions
This section details the various functions and operations of your Casio HR-8RC-BK calculator.

Figure 3.1: Overview of key features.
3.1 Basic Operations
The calculator features a 12-digit display for clear readability. Input numbers using the numeric keypad. Use the basic arithmetic operators (+, -, x, ÷) for calculations. The large display ensures easy viewing of inputs and results.
3.2 Reprint/After Print Function
This feature allows you to print multiple copies of your calculation history or print the calculation history later, even if the printer was initially in 'print off' mode. Press the REPRINT button to activate this function.
3.3 150 Steps Check
The 150 Steps Check function allows you to review up to 150 previous calculation steps. This is useful for verifying calculations and identifying errors. Use the CHECK arrow keys to navigate through the steps.
3.4 Cost/Sell/Margin Calculation
Calculate the cost, selling price, or margin of profit on an item by inputting the other two known values. Use the dedicated COST, SELL, and MAR (Margin) keys for these calculations.
3.5 Tax and Exchange Function
The calculator includes functions for tax calculation and currency conversion. Refer to the detailed instructions in the included user guide for setting up tax rates and exchange rates.
3.6 Profit Margin Percent (%)
The % key provides quick access to prices and profits. It can also be used to calculate add-ons, discounts, ratios, and increase/decrease values.
3.7 Function Command Signs
A symbol (e.g., +, -, x, ÷) displayed on the screen indicates the current operation being performed, providing clear feedback during complex calculations.
3.8 Key Rollover
Key operations are stored in a buffer, ensuring that no input is lost even during high-speed data entry. This feature enhances efficiency and accuracy.

Figure 3.2: Front view of the calculator showing the keypad and display.
4. Maintenance
4.1 Cleaning
To clean the calculator, gently wipe the surface with a soft, dry cloth. For stubborn dirt, dampen the cloth slightly 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. If storing for an extended period, remove the batteries to prevent leakage and damage.
5. Troubleshooting
This section addresses common issues you might encounter with your calculator. If the problem persists, please contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Low or dead batteries. | Replace all batteries with new ones. Ensure correct polarity. |
| Printer not printing. | Paper roll empty or incorrectly installed. Printer mode is OFF. | Install a new paper roll correctly. Check if the printer mode switch is set to ON. |
| Incorrect calculation results. | Incorrect input or function usage. | Review your input steps using the 150 Steps Check function. Refer to the Operating Instructions for specific function usage. |
| Keys are unresponsive. | Dust or debris under keys. | Gently clean around the keys. If problem persists, contact support. |
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Casio |
| Model Number | D21 (HR-8RC-BK) |
| Colour | Black |
| Material | Plastic |
| Calculator Type | Printing |
| Digit | 12 Digits |
| Printing Speed | 2.0 Lines-per-Second |
| Power Source | Battery Powered |
| Screen Size | 2.5 Inches |
| Item Weight | 345 g |
| Item Dimensions (LxWxH) | 20.8 x 10.2 x 4.2 Centimeters |
| Country of Origin | China |
| Date First Available | 19 February 2017 |
7. Warranty & Support
7.1 Warranty Information
This Casio HR-8RC-BK Printing Calculator comes with a 3 Years All India Manufacturer Warranty. Please retain your purchase receipt and the warranty term sheet for any warranty claims. The warranty covers manufacturing defects under normal use conditions.
7.2 Customer Support
For technical assistance, service, or warranty claims, please contact Casio India Co Pvt Ltd. You can find their contact details on the warranty term sheet included with your product or visit the official Casio India website.
Manufacturer/Importer Address:
Casio India Co Pvt Ltd, A-41, 1st Floor, MCIE, Mathura Road, New Delhi-110044
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