Radio Shack EC-3031 User Manual

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Cat. No. 65-754

OWNER’S MANUAL

Please read before using this equipment.

EC-3031

Handheld Printing

Calculator

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FEATURES

Your RadioShack EC-3031Handheld Printing Calculator is afull-featuredcalculator designed for accuracy and ease of use. TheEC-3031can perform many different types of calculations, including percentageadd-ons,discounts, and much more. The print function produces a permanent record of each entry and calculation result for later reference. With its small size, theEC-3031fits easily into a briefcase or travel bag for people on the go.

Its features include:

Percentage Calculations — make determining percentages and taxes simple.

Four-KeyMemory— lets you save subtotals, then add to, subtract from, and recall them for additional calculations.

Round-Off Key — lets you set the calculator to round up or down at two decimal places, or use a full floating decimal point.

©1997 Tandy Corporation. All Rights Reserved.

RadioShack is a trademark

used by Tandy Corporation.

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Paper Feed Key — lets you quickly advance the print paper without affecting calculations.

Non-AddPrint Key— lets you print dates, code numbers, or other reference numbers without affecting the calculations. You can also print out only the calculation results.

Two-WayPaper Feed— lets you feed paper from an internal compartment or from a convenient fold-out roll holder.

Two Power Sources — let you power your calculator from four AA batteries or standard AC power (with an optional AC adapter).

Automatic Power Off — conserves battery power by turning off the calculator about 6 minutes after the last entry.

Before you begin using your new EC3031, we recommend you completely read through this manual and familiarize yourself with the calculator’s many functions and features.

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THE FCC WANTS YOU TO KNOW

This equipment complies with the limits for a Class B digital device as specified in Part 15 of FCC Rules. These limits provide reasonable protection against radio and TV interference in residential areas. However, your calculator might cause TV or radio interference even when it is operating properly. To eliminate interference, try one or more of the following corrective measures:

Reorient or relocate the receiving antenna.

Increase the distance between the calculator and the radio or TV.

Use outlets on different electrical circuits for the calculator and the radio or TV.

Consult your local RadioShack store if the problem still exists.

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CONTENTS

 

Preparation ......................................

6

Choosing a Power Source .............

6

Installing Batteries ....................

6

Using AC Power ........................

9

Installing the Paper Roll ..............

12

Operation .......................................

16

Turning the EC-3031On/Off ........

16

Printing ........................................

17

Printing a Displayed Value ......

18

Rounding .....................................

19

Correcting Entry Errors ...............

21

Correcting Calculation Errors ......

22

Estimating Calculation Results ....

22

Calculation Examples ..................

23

Basic Calculations ..................

23

Constant Calculations .............

24

Memory Calculations ..............

26

Percentage Calculations .........

28

Markup Calculations ...............

30

Care ................................................

31

Replacing the Ink Roller ..............

32

Resetting the Calculator ..............

34

Specifications ................................

35

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PREPARATION

CHOOSING A POWER SOURCE

You can power your calculator from:

Four AA batteries (not supplied)

Standard AC power, using an AC adapter (not supplied)

If you plan to use the print function frequently, we suggest you use an AC adapter.

Installing Batteries

You can power your calculator from four AA batteries. We recommend alkaline batteries, such as RadioShack Cat. No. 23-552.You can also use rechargeablenickel-cadmiumbatteries (Cat. No. 23125) with a battery charger (Cat. No.23-133).

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1.Slide the battery compartment cover in the direction of the arrow and remove it.

2.Install the batteries as indicated by the polarity symbols (+ and –)marked inside the compartment.

Cautions:

Use only fresh batteries of the required size and type.

Never mix fresh and old batteries, alkaline and nickel-cad-mium batteries, or rechargeable batteries of different capacities.

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3.Replace the cover.

4.Press AC to turn power on, then pressRESET with a straightened paper clip to clear the calculator.

Replace the batteries when the printing speed slows or the display dims.

Cautions:

If you do not plan to use the calculator for a month or more, or you plan to use only an AC adapter, remove and store the batteries.

Always dispose of old batteries promptly and properly.

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Never heat, disassemble, or throw batteries into a fire.

Never leave dead, old, or weak batteries in the calculator. They can leak chemicals that corrode or damage electronic circuits.

Important: This calculator is capable of using rechargeablenickel-cadmiumbatteries. At the end of the batteries’ useful life, they must be recycled or disposed of properly. Contact your local, county, or state hazardous waste management authorities for information on recycling or disposal programs in your area. Some options that might be available are: municipalcurb-sidecollection,drop-offboxes at retailers, recycling collection centers, and a mailback program.

Using AC Power

You can power the calculator from standard AC power, using an AC adapter such as Cat. No. 273-1664(not supplied).

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Cautions:

You must use an AC adapter that supplies 6 volts and delivers at least 300 milliamps. Its center tip must be set to negative, and its plug must correctly fit the calculator’s jack. The recommended adapter meets these specifications. Using an adapter that does not meet these specifications could damage the calculator or the adapter.

When you finish using the AC adapter, disconnect it from the AC outlet first, then unplug it from the calculator.

Be sure to turn off the calculator before you connect or disconnect the AC adapter.

Follow these steps to use AC power.

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