1. Introduction
Thank you for choosing the NEWYES Scientific Calculator GY-991MS. This manual provides essential information for the proper use and maintenance of your calculator. The GY-991MS is designed for students and professionals, offering 401 functions, a 2-line display, and dual power sources (solar and battery). Its dustproof design and sensitive keys ensure reliable performance for various mathematical and scientific calculations.
Figure 1: Overview of the NEWYES Scientific Calculator GY-991MS.
2. Setup
2.1 Power Source
The calculator operates on a dual power system: solar power and a CR5 button battery. The solar panel provides power in well-lit environments, extending battery life. The CR5 battery is included and pre-installed.
2.2 Initial Use
- Remove the protective film from the display, if present.
- Press the ON button to power on the calculator.
- The calculator will display "0" on the main screen.
Figure 2: Calculator display and solar panel for dual power.
3. Operating Instructions
3.1 Basic Operations
- Power On/Off: Press ON to turn on. Press SHIFT then AC (OFF) to turn off.
- Clear Entry: Press DEL to delete the last entered digit. Press AC to clear all entries and reset the calculation.
- 2-Line Display: The top line shows the input expression, and the bottom line displays the calculated result.
3.2 Calculation Modes
Press the MODE button to cycle through different calculation modes. The available modes include:
- COMP (General Calculations): Standard arithmetic operations.
- CMPLX (Complex Numbers): Calculations involving complex numbers.
- STAT (Statistics): Statistical calculations including standard deviation and regression.
- BASE-N: Base-n calculations (binary, octal, decimal, hexadecimal).
- Equation: Solving various types of equations.
- Matrix: Matrix calculations.
- TABLE: Generating number tables from functions.
- VECTOR: Vector calculations.
3.3 Advanced Functions (401 Functions)
The calculator supports a wide range of scientific functions. Many functions are accessed by pressing the SHIFT key followed by the desired function key (indicated in yellow above the keys) or the ALPHA key (indicated in red above the keys).
- Fractions: Input fractions using the a b/c key.
- Trigonometric Functions: sin, cos, tan and their inverse functions.
- Logarithmic Functions: log, ln.
- Power and Root Functions: x², √, x³, ³√, xʸ, ʸ√.
- Conversions: Polar to Rectangular and Rectangular to Polar conversions.
- Constants: Access various scientific constants.
Figure 3: The calculator's compact design, suitable for school and office use.
Figure 4: Close-up of the calculator keys, emphasizing their sensitivity and comfort.
4. Maintenance
4.1 Cleaning
To clean the calculator, use a soft, dry cloth. For stubborn dirt, slightly dampen the cloth with water and wipe gently. Avoid using harsh chemicals, abrasive cleaners, or solvents, as these can damage the calculator's surface and display.
4.2 Dust Protection
The calculator comes with a dustproof cover. When not in use, cover the calculator to protect it from dust and debris. The cover can be attached to the back of the calculator during use for convenience.
Figure 5: The dustproof cover providing all-round protection for the calculator.
4.3 Battery Replacement
When the display becomes dim or calculations are erratic, it may be time to replace the CR5 button battery.
- Turn off the calculator.
- Locate the battery compartment on the back of the calculator.
- Use a small screwdriver to open the compartment.
- Carefully remove the old CR5 battery and insert a new one, ensuring correct polarity (+/-).
- Close the battery compartment securely.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Low battery or insufficient light for solar power. | Replace the CR5 battery or move to a brighter environment. |
| Incorrect calculation results. | Incorrect mode selected or syntax error. | Check the current calculation mode (MODE button) and review your input for errors. Refer to the operating instructions for specific function usage. |
| Keys are unresponsive. | Dust or debris under keys, or internal malfunction. | Gently clean around the keys. If the problem persists, contact customer support. |
| Calculator freezes. | Temporary software glitch. | Press the RESET button (usually a small hole on the back, requiring a thin object like a paperclip). This will clear all memory. |
6. Specifications
- Brand: NEWYES
- Model: GY-991MS
- Item Model Number: AC0401
- Color: Black
- Display Type: LCD, 2-line
- Number of Functions: 401
- Power Source: Solar and 1 x CR5 Button Battery (included)
- Key Type: Plastic keys
- Special Features: Dustproof cover, sensitive keys
Figure 6: The calculator is easily portable for daily use.
7. Warranty and Support
For warranty information and customer support, please refer to the documentation provided with your purchase or visit the official NEWYES website. Keep your purchase receipt as proof of purchase.
Contact Information: Please refer to the packaging or the manufacturer's website for the most current contact details.
