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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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Paper Feed Key — lets you quickly ad-
vance the print paper without affecting
calculations.
Non-Add Print Key — lets you print
dates, code numbers, or other refer-
ence numbers without affecting the cal-
culations. 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 an optional AC
adapter).
Automatic Power Off — conserves
battery power by turning off the calcula-
tor about 6 minutes after the last entry.
Before you begin using your new EC-
3031, we recommend you completely
read through this manual and familiar-
ize 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 elimi-
nate 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-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 fre-
quently, 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 rechargeable
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-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
press RESET 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 calcu-
lator 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 bat-
teries 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 dis-
posed of properly. Contact your local,
county, or state hazardous waste man-
agement authorities for information on
recycling or disposal programs in your
area. Some options that might be avail-
able are: municipal curb-side collec-
tion, drop-off boxes at retailers,
recycling collection centers, and a mail-
back program.
Using AC Power
You can power the calculator from stan-
dard AC power, using an AC adapter
such as Cat. No. 273-1664 (not sup-
plied).
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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 calcula-
tor’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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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.
Note: Battery power automatically
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
Note: If the paper roll does not fit inside
the paper roll compartment, you can
use the external roll holder until the roll
is small enough to fit inside the com-
partment (about one-inch diameter).
1. Press AC to turn on the calculator.
2. Slide open the paper roll compart-
ment cover and lift it off.
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3. Cut across the paper to form a
straight end.
4. Insert the paper.
• Insert the end of the paper into
the slot inside the compartment.
• To use the external roll holder,
insert the end of the paper into
the rear slot from the bottom of
the calculator. Then insert the
end of the paper into the slot
inside the compartment.
Be sure the paper feeds from
underneath the paper roll.
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5. Press FEED to advance the paper.
6. Install the paper roll.
• Place the paper roll inside the
paper roll compartment.
• To use the external paper roll
holder, raise the holder and slip
the paper roll onto it.
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7. Replace the cover, threading the
paper through the slot.
Replace the paper roll when you see a
red strip on one edge of the paper. Use
1
a standard 2 /4-inch paper roll, such as
Cat. No. 65-710 or 65-715.
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OPERATION
TURNING THE EC-3031
ON/OFF
Press AC to turn on the EC-3031. Press
OFF to turn it off.
To save power, the EC-3031 automati-
cally turns off if you do not use it for
about 6 minutes. Press AC to turn it
back on.
Note: All previous entries are cleared
when the calculator turns off.
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PRINTING
The EC-3031 can print and display all
calculator entries and results, or simply
display entries and results without print-
ing them. You can also print a date, a
reference or code number, and so on,
without affecting the calculations in
progress.
Note: The calculator’s input buffer
holds up to 7 key operations, so you
can enter calculations even while the
calculator is printing.
To print, press PRT. PRT appears on
the display, and the calculator prints
and displays all your calculator entries
and results.
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To simply display entries and results
without printing them, press PRT again.
PRT disappears from the display and
the calculator displays your entries and
results, but does not print them.
Printing a Displayed Value
To print a displayed value even when
the print function is turned off, press P/#.
If the display is showing a calculation
result, the EC-3031 prints that number
right-justified.
If the display is showing your entry, the
EC-3031 prints those numbers left-
justified, with a # to the left.
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ROUNDING
The RND key determines where the
decimal appears on the display. Each
time you press RND, the display chang-
es from F to 5/4 to CUT.
Select F to display a floating decimal
point. The calculator uses the full 10-
digit display to show your calculation re-
sults.
Select 5/4 to round final calculation re-
sults to two decimal places. If the third
number to the right of the decimal is 5 or
greater, the final calculation rounds up.
If the third number to the right of the dec-
imal is 4 or less, the calculation rounds
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down. The entries and intermediate
results appear with floating decimal
points.
Select CUT to limit final calculation re-
sults to two decimal places with no
rounding. The entries and intermediate
results appear with floating decimal
points.
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CORRECTING ENTRY
ERRORS
If you enter an incorrect value, press C
once. Then enter the correct value and
proceed with your calculation.
If you press an incorrect function key (+,
–, ×, ÷), simply press the correct key
and continue.
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CORRECTING
CALCULATION ERRORS
E (error) appears at the upper left of the
display when:
• A calculation result exceeds 10 dig-
its (this is an overflow error see
“Estimating Calculation Results”).
• A memory calculation exceeds 10
digits (the memory contents remain
unchanged).
• You try to divide by 0.
If E appears, press AC to clear the er-
ror.
ESTIMATING
CALCULATION RESULTS
If you perform an operation that results
in an overflow error, you can estimate
the approximate value (to 10 significant
digits) by following this procedure.
1. Count the number of digits dis-
played to the left of the decimal
point.
2. Remove the decimal point.
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3. Add to the right of the number as
many zeros as there were digits to
the left of the decimal point.
For example, the displayed value
E1.014206404 is estimated to
equal 10,142,064,040 (one zero
added).
4. Press C to clear the error.
CALCULATION
EXAMPLES
Basic Calculations
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Constant Calculations
Press the function key (÷, ×, –, +) twice
to make the following value a constant.
Note: A K appears on the display when
you use a constant.
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Memory Calculations
The memory calculation feature lets you
easily do multi-step calculations. Use
the following keys for memory calcula-
tions.
To store a value in memory, first press
AC then MC to clear the memory. Then
enter the number or calculation and
press M+.
To add a value to the current memory
value, enter the number or calculation
you want to add then press M+. The cal-
culator totals the current calculation and
adds that value to memory.
To subtract a value from the current
memory value, enter the number or cal-
culation you want to subtract, then
–
press M . The calculator totals the cur-
rent calculation and subtracts that value
from memory.
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To recall the value from memory, press
MR.
Note: An M appears on the display
when the memory function is used.
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Percentage Calculations
12% of 1500
What percentage of 880 is 660?
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15% add-on to 2500
25% decrease of 3500
If you made $80 last week and $100
this week, what is the percent increase?
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Markup Calculations
What will the selling price and profit be
when the purchasing price of an item is
$480 and the gross profit margin is
25%?
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CARE
Your RadioShack EC-3031 Handheld
Printing Calculator is an example of su-
perior design and craftsmanship. The
following suggestions will help you care
for the calculator so you can enjoy it for
years.
• Keep the calculator dry. If it gets
wet, wipe it dry immediately. Liq-
uids can contain minerals that cor-
rode the electronic circuits.
• Handle the calculator gently and
carefully. Dropping it can damage
the circuit board and case, and can
cause the calculator to work
improperly.
• Keep the calculator away from dust
and dirt, which can cause prema-
ture wear of parts.
• Wipe the calculator with a damp
cloth occasionally to keep it looking
new. Do not use harsh chemicals,
cleaning solvents, or strong deter-
gents to clean the calculator.
• Use and store the calculator only in
normal temperature environments.
Temperature extremes can short-
en the life of electronic devices,
damage batteries, and distort or
melt plastic parts.
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Modifying or tampering with the calcula-
tor’s internal components can cause a
malfunction and might invalidate its
warranty and void your FCC authoriza-
tion to operate it. If your calculator is not
performing as it should, take it to your
local RadioShack store for assistance.
REPLACING THE INK
ROLLER
The printer uses a disposable ink roller
cartridge. When the print gets too light,
replace the ink roller cartridge. You can
order replacement ink cartridges from
your local RadioShack store.
Caution: Never try to reuse the ink roll-
er by adding a solvent or liquid ink to it.
This could damage the printer.
1. Slide open the paper roll compart-
ment cover and lift it off.
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2. Raise the paper roll holder, if nec-
essary.
3. Remove the ink roller by lifting it
where you see PULL UP.
4. Install the new ink roller cartridge.
5. Lower the paper roll holder, if nec-
essary.
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6. Replace the cover.
RESETTING THE
CALCULATOR
If your EC-3031 locks up, you reset it,
as shown in “Installing Batteries” on
Page 6.
Note: The reset procedure clears all
calculations and memory values.
If your EC-3031 still does not work
properly, replace the batteries and
press RESET again.
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SPECIFICATIONS
Ambient Temperature Range: 32–104°F
(0–40°C)
Battery Life .............. About 4,000 lines
of printing
Power ................. 4 AA batteries (1.5 V)
Optional AC Adapter
(Cat. No. 273–1664)
Dimensions
(HWD including roll holder):
19/16 × 37/8 × 79/16 Inches
(39 × 98 × 192 mm)
Weight (including batteries) ......... 12 oz
(.34 kg)
Specifications are typical; individual
units might vary. Specifications are sub-
ject to change and improvement without
notice.
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NOTES
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Limited One-Year Warranty
This product is warranted by RadioShack against
manufacturing defects in material and workmanship
under normal use for one (1) year from the date of
purchase from RadioShack company-owned stores
and authorized RadioShack franchisees and deal-
ers. EXCEPT AS PROVIDED HEREIN, Ra-
dioShack MAKES NO EXPRESS WARRANTIES
AND ANY IMPLIED WARRANTIES, INCLUDING
THOSE OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, ARE LIMITED IN
DURATION TO THE DURATION OF THE WRIT-
TEN LIMITED WARRANTIES CONTAINED
HEREIN. EXCEPT AS PROVIDED HEREIN, Ra-
dioShack SHALL HAVE NO LIABILITY OR RE-
SPONSIBILITY TO CUSTOMER OR ANY OTHER
PERSON OR ENTITY WITH RESPECT TO ANY
LIABILITY, LOSS OR DAMAGE CAUSED DI-
RECTLY OR INDIRECTLY BY USE OR PERFOR-
MANCE OF THE PRODUCT OR ARISING OUT
OF ANY BREACH OF THIS WARRANTY, INCLUD-
ING, BUT NOT LIMITED TO, ANY DAMAGES RE-
SULTING FROM INCONVENIENCE, LOSS OF
TIME, DATA, PROPERTY, REVENUE, OR PROFIT
OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, EVEN IF Ra-
dioShack HAS BEEN ADVISED OF THE POSSI-
BILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how
long an implied warranty lasts or the exclusion of in-
cidental or consequential damages, so the above
limitations or exclusions may not apply to you.
(continued)
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(continued)
In the event of a product defect during the warranty
period, take the product and the RadioShack sales
receipt as proof of purchase date to any Ra-
dioShack store. RadioShack will, at its option, un-
less otherwise provided by law: (a) correct the
defect by product repair without charge for parts
and labor; (b) replace the product with one of the
same or similar design; or (c) refund the purchase
price. All replaced parts and products, and prod-
ucts on which a refund is made, become the prop-
erty of RadioShack. New or reconditioned parts
and products may be used in the performance of
warranty service. Repaired or replaced parts and
products are warranted for the remainder of the
original warranty period. You will be charged for re-
pair or replacement of the product made after the
expiration of the warranty period.
This warranty does not cover: (a) damage or failure
caused by or attributable to acts of God, abuse, ac-
cident, misuse, improper or abnormal usage, failure
to follow instructions, improper installation or main-
tenance, alteration, lightning or other incidence of
excess voltage or current; (b) any repairs other than
those provided by a RadioShack Authorized Ser-
vice Facility; (c) consumables such as fuses or bat-
teries; (d) cosmetic damage; (e) transportation,
shipping or insurance costs; or (f) costs of product
removal, installation, set-up service adjustment or
reinstallation.
This warranty gives you specific legal rights, and
you may also have other rights which vary from
state to state.
RadioShack Customer Relations, Dept. W, 100
Throckmorton St., Suite 600, Fort Worth, TX 76102
We Service What We Sell
3/97
RadioShack
A Division
of Tandy Corporation
Fort Worth, Texas 76102
6A7
Printed in China
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