Introduction to the TI-55 III Scientific Calculator
The Texas Instruments TI-55 III is an advanced scientific calculator designed to assist users in a wide range of mathematical, scientific, business, and everyday calculations. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your TI-55 III calculator, enabling you to leverage its powerful features effectively.
For detailed examples and advanced techniques on applying the TI-55 III as a decision-making tool, refer to the comprehensive guide book available separately.
Setup and Initial Use
1. Battery Installation
The TI-55 III operates on standard batteries (e.g., two AA batteries, specific type may vary by model revision). Follow these steps to install or replace batteries:
- Ensure the calculator is turned OFF.
- Locate the battery compartment cover on the back of the calculator.
- Slide or unclip the cover to open it.
- Insert new batteries, observing the correct polarity (+ and -) as indicated inside the compartment.
- Replace the battery compartment cover securely.
Note: Remove batteries if the calculator will not be used for an extended period to prevent leakage.
2. Initial Power On
Press the ON/OFF button to power on the calculator. The display should show "0." or a similar initial state. If the display is blank, check battery installation or replace batteries.
Operating the TI-55 III Calculator
The TI-55 III features a user-friendly interface for performing various calculations.
Basic Operations
- Addition, Subtraction, Multiplication, Division: Enter the first number, press the desired operation key (+, -, ×, ÷), enter the second number, then press =.
- Clear Entry/Clear All: Use CE/C to clear the last entry or the entire calculation.
Scientific Functions
Access scientific functions using the dedicated keys or the 2nd function key.
- Trigonometric Functions: SIN, COS, TAN and their inverses (2nd SIN⁻¹, etc.). Ensure the correct angle mode (DEG, RAD, GRAD) is selected using the DRG key.
- Logarithmic Functions: LOG (base 10) and LN (natural logarithm).
- Powers and Roots: x², √x, yˣ.
- Factorials: n! (often accessed via 2nd function).
Memory Functions
Store and recall numbers using the memory keys:
- STO: Store a number into memory.
- RCL: Recall a number from memory.
- SUM: Add a number to the current memory value.
- EXC: Exchange the display value with the memory value.
Programming Features
The TI-55 III offers basic programming capabilities, allowing users to store and execute sequences of keystrokes for repetitive calculations. Consult the detailed guide book for instructions on creating, editing, and running programs.
Maintenance and Care
Cleaning
To clean your calculator, use a soft, dry cloth. For stubborn dirt, slightly dampen the cloth with water or a mild, non-abrasive cleaner. Do not use strong solvents or immerse the calculator in liquid.
Storage
Store the calculator in a cool, dry place away from direct sunlight and extreme temperatures. If storing for an extended period, remove the batteries.
Troubleshooting Common Issues
- Calculator does not turn on:
- Check battery installation and ensure correct polarity.
- Replace old or depleted batteries with new ones.
- Ensure the ON/OFF button is pressed firmly.
- Blank or dim display:
- Replace batteries.
- Ensure the calculator is not exposed to extreme cold, which can affect LCD performance.
- Incorrect calculation results:
- Verify input values and operation sequence.
- Check the current angle mode (DEG, RAD, GRAD) for trigonometric functions.
- Clear all memory and previous calculations using the appropriate clear function.
- Keys are unresponsive:
- Clean the calculator surface around the keys.
- Replace batteries, as low power can sometimes affect key responsiveness.
Specifications
Below are general specifications for the Texas Instruments TI-55 III Scientific Calculator. Specific details may vary slightly by manufacturing batch.
| Feature | Detail |
|---|---|
| Display | Liquid Crystal Display (LCD), 10-digit mantissa + 2-digit exponent |
| Power Source | 2 x AA Batteries (typical) |
| Functions | Scientific, Statistical, Programmable |
| Memory | Multiple memory registers, program memory |
| Dimensions (Approx.) | 150mm x 80mm x 15mm (L x W x H) |
| Weight (Approx.) | 120g (excluding batteries) |
Warranty Information
Texas Instruments products are manufactured to high-quality standards. This calculator typically comes with a limited warranty covering defects in materials and workmanship for a period of one year from the date of purchase. Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, accident, unauthorized repair, or normal wear and tear. For full warranty terms and conditions, please refer to the documentation included with your purchase or visit the official Texas Instruments website.
Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty service, please contact Texas Instruments Customer Support:
- Website: Visit the official Texas Instruments support website for FAQs, downloads, and contact options.
- Phone: Refer to the contact information provided in your product packaging or on the TI website for regional support numbers.
- Online Resources: Explore online forums and communities for user-generated tips and solutions.
When contacting support, please have your calculator model number (TI-55 III) and purchase details ready.
