Casio FX-85DE CW ClassWiz Technical Scientific Calculator
Model: FX-85DECW | Brand: Casio
Introduction
The Casio FX-85DE CW ClassWiz is a technical scientific calculator designed for a wide range of mathematical and scientific calculations. It features a natural display, an intuitive icon menu, and over 310 functions, making complex calculations accessible and efficient. This manual provides essential information for setting up, operating, and maintaining your calculator.
Figure 1: Front view of the Casio FX-85DE CW ClassWiz calculator, showing its display and key layout. The display shows a complex fraction calculation.
Setup
Battery Installation and Power Source
The Casio FX-85DE CW ClassWiz calculator operates using both solar power and a single LR 044 battery. The battery is included with the product.
- Ensure the calculator is exposed to sufficient light for solar operation.
- The LR 044 battery provides power in low-light conditions or when solar power is insufficient.
- To replace the battery, refer to the "Maintenance" section for detailed instructions.
Initial Power On
To turn on the calculator, press the ON button located on the top left of the keypad. The calculator will display the main menu or the last active calculation mode.
Operating Instructions
Display and Navigation
- Natural Display: Mathematical expressions such as roots, fractions, and logarithms are displayed as they appear in textbooks.
- Icon Menu: Navigate through various modes and functions using the intuitive icon menu. Use the directional keys to select an icon and press OK to confirm.
- Characters/Lines: The display supports 17 characters per line with 1+10/1 lines for input/output.
- Display Shades: The display features 4 shades of grey for improved readability.
Basic Operations
- Arithmetic: Perform addition, subtraction, multiplication, and division using the dedicated keys.
- Fraction Calculation: Input and calculate fractions directly using the fraction key.
- Percentage Calculation: Use the percentage function for calculations involving percentages.
- Exponent and Logarithm: Access functions for exponents (x², xʸ), square roots (√), and logarithms (log, ln, 10ˣ).
Advanced Functions
- Trigonometric Functions: Calculate sine, cosine, tangent, and their inverse functions (sin⁻¹, cos⁻¹, tan⁻¹).
- Hyperbolic Functions: Access sinh, cosh, tanh, and their inverse functions.
- Angle Dimensions: Convert between DEG (degrees), RAD (radians), and GRAD (gradians).
- Coordinate Conversion: Convert between polar and rectangular coordinates.
- Prime Factor Decomposition: Determine the prime factors of a number.
- Technical Notation: Use ENG/ENG notation for engineering calculations.
- Random Number Generator: Generate random numbers or integer random numbers.
- Check Function "Verify": Verify the correctness of equations.
- Value Table: Generate tables of values for functions f(x) and g(x).
- Periodic Decimal Fraction: Display periodic decimal fractions.
Statistical Calculations
The calculator supports various statistical calculations:
- Sum formation of ∑x, ∑x²
- Sum formation of ∑x, ∑y, ∑x², ∑y², ∑x*y
- Standard deviations for grouped and ungrouped values
- Regression analysis
- Permutation (nPr) and Combinatorics (nCr)
Special Features
- Maths Box: Simulate random experiments such as coin tosses and dice rolls.
- QR Code Function: Generate QR codes to visualize results and functions on a smartphone or tablet.
- German Menu Language: The calculator features German menu navigation.
Maintenance
Cleaning
To clean the calculator, use a soft, dry cloth. Do not use abrasive cleaners, solvents, or alcohol, as these can damage the casing and display.
Storage
Store the calculator in its hard case when not in use to protect it from dust, scratches, and impacts. Avoid exposing the calculator to extreme temperatures or direct sunlight for prolonged periods.
Battery Replacement
The calculator uses one LR 044 battery. When the display becomes dim or the calculator functions erratically, it may be time to replace the battery.
- Turn off the calculator.
- Locate the battery compartment on the back of the calculator.
- Carefully open the compartment cover.
- Remove the old LR 044 battery.
- Insert a new LR 044 battery, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
- Dispose of the old battery according to local regulations.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Calculator does not turn on. | Insufficient light for solar power, or dead battery. | Move to a well-lit area. Replace the LR 044 battery. |
| Display is dim or flickering. | Low battery power. | Replace the LR 044 battery. Ensure adequate light for solar panel. |
| Incorrect calculation results. | Incorrect mode setting, syntax error, or memory issue. | Check the current mode (e.g., DEG/RAD). Review input syntax. Clear calculator memory if necessary (refer to advanced manual for reset procedure). |
| Keys are unresponsive. | Calculator frozen or physical damage. | Try turning the calculator off and on again. If problem persists, contact customer support. |
Specifications
Figure 2: Dimensions of the Casio FX-85DE CW ClassWiz calculator, showing a height of 6.38 inches and a width of 3.03 inches.
- Model Number: FX-85DECW
- Product Dimensions: 6.81 x 3.03 x 0.63 inches (17.3 x 7.7 x 1.6 cm)
- Item Weight: 3.35 ounces (95 g)
- Power Source: Solar + 1x LR 044 Battery (included)
- Display: 63 x 192 full dot, Natural Display, 4 shades of grey
- Functions: 310+ functions
- Memory: 9 variable memory
- Automatic Switch-off: Yes
- Included Accessories: Hard case
- Manufacturer: Casio Europe GmbH
Warranty and Support
For warranty information and customer support, please refer to the official Casio website or contact your local Casio distributor. Keep your purchase receipt as proof of purchase for any warranty claims.
For further assistance or detailed operational guides, please visit the Casio Calculators official website.
