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the handset and base. If the con- tacts are dirty or tarnished, gently clean them with a pencil eraser.

•About once a month, fully dis- charge the battery by keeping the handset off the cradle until flashes, then return the handset to the cradle and fully recharge the battery. If you do not fully discharge and recharge the battery periodically, it loses its

ability to fully recharge.

•The first time you use your phone after charging a new battery, the handset might not work and might sound an error tone when you press TALK. This might also occur when you recharge a battery that has been completely discharged. If this happens, be sure the hand- set is turned on, then return the handset to the cradle for 5 sec- onds. This resets the security access code.

SETTING THE DIALING MODE

Set TONE/PULSE on the back of the base for the type of service you have.

If you are not sure which type you have, do this test.

1.Set TONE/PULSE to TONE.

2.Lift the handset and listen for a dial tone.

3.Press any number other than 0.

If the dial tone stops, you have touch-tone service. Leave TONE/ PULSE set to TONE.

If the dial tone continues, you have pulse service. Set TONE/ PULSE to PULSE.

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Radio Shack ET-543 owner manual Setting the Dialing Mode
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ET-543 specifications

The Radio Shack ET-543 is a noteworthy addition to the realm of portable electronic technology, particularly in the category of handheld calculators and educational tools. Launched during a vibrant era of innovation, the ET-543 encapsulates the spirit of the late 20th century, when personal computing and digital gadgets became increasingly accessible to the general public.

At its core, the ET-543 features a natural display that allows for easy viewing of calculations, making it user-friendly for both novices and seasoned users alike. The device is equipped with a combination of mathematical functions that streamline computations ranging from basic arithmetic to more complex algebraic operations. This wide array of capabilities makes the ET-543 an ideal choice for students and professionals who require a reliable tool for everyday calculations.

One of the standout technologies of the ET-543 is its robust memory function, which allows users to store multiple calculations for later use. This feature is particularly beneficial for users who engage in repetitive tasks or require a quick reference for previously calculated values. Coupled with its programmable functions, the ET-543 presents a versatile platform that can accommodate a range of mathematical needs.

In terms of design, the Radio Shack ET-543 boasts a compact and lightweight form factor, making it highly portable. This characteristic is essential for users who need a dependable calculator on the go, whether in the classroom, workplace, or during travel. The button layout is intuitive, allowing for easy navigation through various functions without the need for extensive training.

Another important aspect of the ET-543 is its educational value. The device serves as a practical teaching aid, helping students grasp fundamental concepts of mathematics and computation. Its durability and ease of use ensure that it stands up to repeated use in educational environments.

In summary, the Radio Shack ET-543 is more than just a calculator; it embodies the fusion of technological innovation and user-centric design. With features tailored to meet a variety of mathematical challenges, coupled with its portability and educational utility, the ET-543 remains a symbol of practical technology that resonates with users across generations.
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