After setting up the Casio DS-2B-GD-W-DP calculator, when I press 500 and then TAX, the number 500 does not change. What should I do?

The Casio DS-2B-GD-W-DP calculator has dedicated keys for tax calculations (TAX+ and TAX-). However, the manual states that the tax rate must be set prior to using these functions. It is likely that the tax rate has not been set, which is why the number 500 is not changing when you press the TAX key.To resolve this, you will need to set the tax rate on your calculator. The provided manual excerpt mentions that detailed instructions for setting the tax rate can be found in the full Casio manual. Unfortunately, the specific steps for setting the tax rate are not detailed in this excerpt.Next Steps:Refer to the comprehensive user manual for the Casio DS-2B-GD-W-DP for detailed instructions on how to set the tax rate.Once the tax rate is set, try the TAX+ or TAX- function again.If you are still experiencing issues, ensure you are following the correct sequence of operations for tax calculations as outlined in the full manual.

Casio DS-2B-GD-W-DP 12-Digit Practical Calculator User Manual

Introduction

This manual provides instructions for the proper use and maintenance of your Casio DS-2B-GD-W-DP 12-Digit Practical Calculator. Please read this manual thoroughly before using the calculator to ensure optimal performance and longevity.

Casio DS-2B-GD-W-DP 12-Digit Practical Calculator, front view

Figure 1: Front view of the Casio DS-2B-GD-W-DP calculator, showing the display and key layout.

Setup

Power Source

The Casio DS-2B-GD-W-DP calculator operates using a dual power system: solar power and battery power. It automatically switches between these sources based on ambient light conditions.

Solar Power: The calculator is powered by solar cells when sufficient light is available. Ensure the solar panel, located above the display, is exposed to light for operation.
Battery Power: When light is insufficient, the calculator automatically switches to battery power. No user intervention is required for this transition.

Casio DS-2B-GD-W-DP calculator showing the solar panel and display

Figure 2: Top view of the calculator, highlighting the solar panel and large display area.

Initial Use

Place the calculator in a well-lit area.
Press the ON/AC button to turn on the calculator and clear any previous calculations.
The display should show "0". If the display is blank, ensure adequate light is available or that the battery is functional.

Operating Instructions

Basic Calculations

Addition: Enter the first number, press +, enter the second number, press =.
Subtraction: Enter the first number, press -, enter the second number, press =.
Multiplication: Enter the first number, press ×, enter the second number, press =.
Division: Enter the first number, press ÷, enter the second number, press =.
Clear Entry: Press CE (often combined with AC) to clear the last entered number.
All Clear: Press AC to clear all calculations and reset the display to zero.

Memory Functions

The calculator includes independent 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 stored in memory to the display.
MC: Clears the memory.

Tax Calculation

The calculator features dedicated keys for tax calculations.

TAX+: Adds tax to the displayed value.
TAX-: Subtracts tax from the displayed value.

Note: The tax rate must be set prior to using these functions. Refer to the full Casio manual for detailed instructions on setting the tax rate.

Casio DS-2B-GD-W-DP calculator showing the key layout for operations

Figure 3: Close-up of the calculator's key layout, showing function keys like M+, M-, MR, MC, TAX+, and TAX-.

Maintenance

Cleaning

Wipe the calculator with a soft, dry cloth.
For stubborn dirt, lightly dampen the cloth with water and a mild detergent, then wipe dry immediately.
Do not use strong solvents, abrasive cleaners, or spray cleaners directly onto the calculator.

Storage

Store the calculator in a cool, dry place away from direct sunlight and extreme temperatures.
Avoid exposing the calculator to excessive moisture or dust.

Battery Replacement

The calculator uses a button-cell battery as a backup power source. If the display becomes dim or unresponsive in sufficient light, the battery may need replacement. Battery replacement should ideally be performed by a qualified technician or according to the detailed instructions in the comprehensive Casio manual to avoid damaging the device.

Troubleshooting

Problem	Possible Cause	Solution
Display is blank or dim.	Insufficient light for solar power. / Battery is low or depleted.	Move the calculator to a brighter area. / Replace the battery (refer to Maintenance section).
Calculator does not respond to key presses.	Calculator is off. / Temporary malfunction.	Press ON/AC. / Remove the calculator from light for a few minutes, then re-expose to light and press ON/AC.
Incorrect calculation results.	Incorrect input. / Incorrect mode setting.	Verify input numbers and operations. / Press AC to clear and restart. Check mode settings if applicable (e.g., decimal point selector).

Specifications

Model: Casio DS-2B-GD-W-DP
Digits: 12
Power Source: Solar & Battery (Dual Power)
Display Type: Extra Large LCD
Key Type: Durable anti-fade plastic keys
Dimensions (L x W x H): Approximately 18.95 x 14 x 0.25 cm
Weight: Approximately 305 g
Material: Plastic
Functions: Basic arithmetic, Memory (M+, M-, MR, MC), Tax calculation (TAX+, TAX-), Percentage (%), Square Root (√), Grand Total (GT), Mark-up (MU), Decimal Selector (F, CUT, UP, 5/4), Rounding Selector (4, 3, 2, 1, 0, ADD2).

Casio DS-2B-GD-W-DP calculator packaging showing features

Figure 4: Product packaging highlighting key features such as solar & battery power, extra large display, and durable keys.

Warranty and Support

For detailed warranty information and customer support, please refer to the documentation included with your purchase or visit the official Casio website.