Radio Shack Calculator EC 3031 User Guide

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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)  
39  
 
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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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