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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
2
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.
12
to turn on the calculator.
AC
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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 c om partment.
• 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
to advance the paper.
FEED
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
a standard 21/4-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
to turn it off.
OFF
To save power, the EC-3031 automatically turns off if you do not use it for
about 6 minutes. Press
back on.
All previous entries are cleared
Note:
when the calculator turns off.
16
to turn it
AC
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PRINTING
The EC-3031 can print and display all
calculator entries and results, or simply
display entries and results without printing them. You can also print a date, a
reference or code number, and so on,
without affecting the calculations in
progress.
The calculator’s input buffer
Note:
holds up to 7 key operations, so you
can enter calculations even while the
calculator is printing.
To print, press
the display, and the calculator prints
and displays all your calculator entries
and results.
. PRT appears on
PRT
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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, pres s
If the display is showing a calculation
result, the EC-3031 prints that number
right-justified.
P/#
.
If the displ ay is sho wing yo ur entry , the
EC-3031 prints those numbers leftjustified, with a
# to the left.
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ROUNDING
The
decimal appears on the display. Each
time you press
es from
Select F to display a floating decimal
point. The calculator uses the full 10digit display to sh ow your calculation results.
Select
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 numbe r to the right of the decimal is 4 or les s, the calc ulation r ounds
key determines where the
RND
, the display chang-
RND
F to 5/4 to CUT.
5/4 to round fi nal calculation re-
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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. Th e entries and intermed iate
results appear with floating decimal
points.
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CORRECTING ENTRY
ERRORS
If you enter an incorrect value, press
once. Then e nter th e correct value and
proceed with your calculation.
If you press an incorrect func tion ke y (+,
–, ×, ÷), simply press the correct key
and continue.
C
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CORRECTING
CALCULATION ERRORS
E (error) appears at the upper left of the
display when:
• A calculation res ult exce eds 10 di gits (this is an overflow error see
“Estimating Calculation Results”).
• A memory calculation exceeds 10
digits (the m emory contents remain
unchanged).
• You try to divide by 0.
If
E appears, press
ror.
to clear the er-
AC
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 displayed 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
to clear the error.
C
CALCULATION
EXAMPLES
Basic Calculations
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Constant Calculations
Press the func tion key (÷, ×, –, +) twice
to make the following value a constant.
K appears on the display when
A
Note:
you use a constant.
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Memory Calculations
The memory calculati on featu re lets yo u
easily do multi-step calculations. Use
the following keys for memory calculations.
To store a value in memory, first press
then MC to clear the memory. Then
AC
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 p r es s
culator totals the curre nt c alcul ation and
adds that value to memory.
. The cal-
M+
To subtract a value from the current
memory value, enter the number or calculation you want to subtract, then
press
–
. The calculator totals the cur-
M
rent calculation and subtracts that value
from memory.
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To recall the value from memory, press
.
MR
M appears on the display
An
Note:
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 superior 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. Liquids can contain minerals that corrode 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 premature 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 detergents to clean the calculator.
• Use and store the calculator only in
normal temperature environments.
Temperature extremes can shorten the life of electronic devices,
damage batteries, and distort or
melt plastic parts.
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Modifying or tampering with the calculator’s internal components can cause a
malfunction and might invalidate its
warranty an d void your FCC auth orization to operate it. I f y our cal cu lat or i s n ot
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:
er by adding a solvent or liquid ink to it.
This could damage the printer.
1. Slide open the paper roll compart-
32
Never try to reuse the ink roll-
ment cover and lift it off.
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2. Raise the paper roll holder, if necessar y.
3. Remove the ink roller by lifting it
where you see PULL UP.
4. Install the new ink roller car tridge.
5. Lower the paper roll holder, if necessar y.
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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.
The reset procedure clears all
Note:
calculations and memory values.
If your EC-3031 still does not work
properly, replace the batteries and
press
34
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):
Weight (including batteries) ......... 12 oz
Specifications are typical; individual
units might vary. Sp ec ifi cat ion s a r e su bject to change and imp r ov ement without
notice.
9
/16 × 37/8 × 79/16 Inches
1
(39 × 98 × 192 mm)
(.34 kg)
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NOTES
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Limited One-Year Warranty
This product is warranted by Ra dioShack against
manufacturing defects in material and workmanship
under norma l use for one (1) year from the date of
purchase from RadioS hack compa ny-owned st ore s
and authorized Radio Shack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack 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 WRITTEN LIMITED WARRANTIES CONTAINED
HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER
PERSON OR ENTITY WITH RESPECT TO ANY
LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT
OF ANY BREACH OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS OF
TIME, DATA, PROPERTY, REVENUE, OR PROFIT
OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how
long an implied warranty lasts or the exclusion of incidental or consequenti al 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 durin g th e warrant y
period, take the product and th e RadioShack sales
receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, unless otherwise provided by law: (a) correct the
defect by product repair without charge for parts
and labor; (b ) replace the product wi th one of the
same or similar design; or (c) refund the purc hase
price. All replaced pa rts and products, and products on which a r efund is made, becom e the pr operty of RadioShack. New or reconditioned parts
and products may be used in the pe rformance of
warranty service. Repair ed or replaced parts and
products are warranted for the remainder of the
original warranty period. You will be charged for repair or replacement of the product made after the
expiration of the warranty period.
This warranty does not cover: (a) dam ag e or failure
caused by or attributable to acts of God, abuse, accident, misuse, improper or abnormal usage, failure
to follow instructions, improper installation or maintenance, alteration, lightnin g or other incidence of
excess voltage or current; (b) any repairs other than
those provided by a RadioS hack Authorized Service Facility; (c) consumables such as fuses or batteries; (d) cosmetic damage; (e) transportation,
shipping or insurance cos ts; or (f) costs of produc t
removal, installation, set-up ser vice adjustment or
reinstallation.
This warranty gives you specific legal rights, and
you may also have other rights which vary from
state to state.
Throckmorton St., Suite 600, Fort Worth, TX 76102
)
RadioShack Customer Relations, Dept. W, 100
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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