Aurora DT661 Business Calculator Instruction Manual

1. Introduction

Thank you for choosing the Aurora DT661 Business Calculator. This manual provides detailed instructions on how to set up, operate, and maintain your calculator to ensure optimal performance. The DT661 is designed for business and financial calculations, featuring a large 12-digit display, durable metal casing, and specialized functions like Cost-Sell-Margin and Tax calculations.

Figure 1: Aurora DT661 Business Calculator Overview

2. Setup

2.1 Power Source

The Aurora DT661 calculator operates using both solar power and a single product-specific alkaline battery (included). For optimal performance, ensure the solar panel is exposed to sufficient light. The battery provides power in low-light conditions or when solar power is insufficient.

2.2 Initial Use

Upon first use, or after extended storage, the display may be blank. Place the calculator in a well-lit area to activate the solar power, or press the 'AC' button to clear any residual memory and ensure the display is active.

3. Operating Instructions

3.1 Basic Arithmetic Operations

Perform standard calculations using the number keys (0-9, 00, .), and operation keys (+, -, X, ÷, =).

• Addition (+): Enter first number, press '+', enter second number, press '='.
• Subtraction (-): Enter first number, press '-', enter second number, press '='.
• Multiplication (X): Enter first number, press 'X', enter second number, press '='.
• Division (÷): Enter first number, press '÷', enter second number, press '='.

3.2 Clear Functions

• AC (All Clear): Clears all entries and memory, resetting the calculator to its initial state.
• C/CE (Clear Entry/Clear): Clears the last entered number. Pressing it twice typically clears the entire calculation without affecting memory.

3.3 Special Functions

• Cost-Sell-Margin (CSM): This function allows you to calculate any one of Cost, Selling Price, or Margin when the other two values are known.
• Tax Function (+TAX, -TAX): Ideal for VAT calculations.
• Programmable Currency Conversion: Allows setting a conversion rate for quick currency exchanges. Refer to the detailed instructions in the product packaging for setting specific rates.
• Memory Functions (M+, M-, MRC):
  • M+: Adds the displayed value to memory.
  • M-: Subtracts the displayed value from memory.
  • MRC (Memory Recall/Clear): Press once to recall the memory value. Press twice to clear the memory.
• Percentage (%): Calculates percentages.
• Square Root (√): Calculates the square root of the displayed number.
• +/- (Sign Change): Changes the sign of the displayed number (positive to negative, or negative to positive).

4. Maintenance

4.1 Cleaning

To clean the calculator, use a soft, dry cloth. For stubborn marks, a slightly damp cloth with mild soap can be used, but ensure no liquid enters the calculator. Do not use abrasive cleaners or solvents.

4.2 Battery Replacement

While the calculator is primarily solar-powered, the included alkaline battery provides backup. If the display becomes dim or unresponsive in low light, the battery may need replacement. Refer to the battery compartment on the back of the unit for specific battery type and replacement instructions.

4.3 Storage

Store the calculator in a cool, dry place away from direct sunlight and extreme temperatures when not in use for extended periods.

5. Troubleshooting

• Display is blank or dim:
  • Ensure the solar panel is exposed to sufficient light.
  • The battery may be low or depleted. Replace the battery if necessary.
  • Press the 'AC' button to reset the display.
• Incorrect calculations:
  • Ensure correct input sequence.
  • Clear previous calculations using 'AC' or 'C/CE'.
  • Check if memory (M) is active and clear it if not intended.
• Keys are unresponsive:
  • Ensure the calculator is clean and free of debris around the keys.
  • Press 'AC' to reset the unit.

6. Specifications

7. Warranty and Support

For information regarding warranty coverage and customer support, please refer to the warranty card included with your product packaging or visit the official Aurora website. Keep your purchase receipt as proof of purchase for any warranty claims.