EC-3031
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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-3031 Handheld
Printing Calculator is a full-featured calculator designed for accuracy and ease
of use. The EC-3031 can perform many
different t ypes of c alculat ions, i ncludi ng
percentage add-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, the EC-3031 fits
easily into a briefcase or travel bag for
people on the go.
Its features include:
Percentage Calculations
— make determining percentages and taxes simple.
Four-Key Memory
— 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 us e a ful l f loating decimal
point.
©
1997 Tandy Corporation.
All Rights Reserved.
RadioShack is a trademark
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used by Tandy Corporation.
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Paper Feed Key
— lets you quickly advance the print paper without affecting
calculations.
Non-Add Print 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-Way Paper 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 a n opti onal 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
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.
FCC Rules
. These limits
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-3031 On/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 ca n also us e recha rgeab le
nickel-cadmium batteries (Cat. No. 23-
125) 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 batter-
ies, alkaline and nickel-cadmium batteries, or rechargeable
batteries of different capacities.
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3. Replace the cover.
4. Press
press
to turn power on, then
AC
with a straightened
RESET
paper clip to clear the calculator.
Replace th e batter ies wh en the pr inting
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.
• Nev er le ave dead, old , or w e ak batteries in the calculator. They can
leak chemicals that corrode or
damage electronic circuits.
Important:
This calculator is capable of
using rechargeable nickel-cadmium
batteries. 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: municipal curb-side collection, drop-off boxes at retailers,
recycling collection centers, and a mailback program.
Using AC Powe r
You can power the calculato r from sta ndard 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 thes e s pe cif ic atio ns.
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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1. Attach the 5.5 mm outer diameter/
2.1 mm inner diameter barrel plug
to the adapter cord, matching TIP
on the plug’s side with –NEG on
the cord.
2. Set the adapter’s voltage switch to
6V.
3. Insert the adapter’s barrel plug into
the calculator’s jack.
Battery power automatically
Note:
disconnects when you connect an
AC adapter to the calculator.
4. Plug the other end of the adapter
into a standard AC outlet.
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INSTALLING THE PAPER
ROLL
If the paper roll does not fit inside
Note:
the paper roll compartment, you can
use the external roll holder until the roll
is small enough to fit inside the compartment (about one-inch diameter ).
1. Press
2. Slide open the paper roll compartment cover and lift it off.
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to turn on the calculator.
AC
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