Radio Shack Calculator EC 2037 User Guide

Cat. No. 65-534  
OWNER’S MANUAL  
Please read before using this equipment.  
EC-2037  
10-Digit Dual-Powered  
Metal Case Desktop Calculator  
with Tilt Display  
 
CONTENTS  
Operation ............................................................................... 4  
Turning the Calculator  
On and Off .............................................................................. 4  
Using the +/– Key ............................................................ 4  
Correcting Entry Errors .................................................... 5  
Estimating Calculation Results ................................. 6  
Calculation Examples ...................................................... 7  
Mixed Calculations ................................................... 7  
Constants ................................................................. 8  
Percentage ............................................................... 9  
Add-On ..................................................................... 9  
Discount ................................................................... 9  
Reciprocal .............................................................. 10  
Exponent ................................................................ 10  
Square .................................................................... 10  
Square Root ............................................................ 11  
Memory Calculations ............................................... 11  
Care ...................................................................................... 13  
Replacing the Battery ......................................................... 14  
Specifications ..................................................................... 15  
3
 
OPERATION  
TURNING THE CALCULATOR  
ON AND OFF  
Press ON/C to turn on your  
calculator, then tilt the display  
to the best viewing angle.  
To clear a calculation from the  
display, press ON/C again.  
If you do not press a key for  
about 5 minutes, your calcula-  
tor automatically turns off. To  
turn it off sooner, press OFF.  
USING THE +/– KEY  
Press +/– to change the displayed number from positive to neg-  
ative or from negative to positive. When the number is negative,  
appears on the left side of the display.  
4
 
CORRECTING ENTRY ERRORS  
If you enter an incorrect value, press CE once. Then enter the  
correct value and continue your calculation.  
If you press an incorrect function key (+, , ×, ÷), simply press  
the correct function key and continue your calculation.  
Eappears in the lower left corner when:  
• A calculation result exceeds 10 digits to the left of the deci-  
mal point. This is an overflow error. See “Estimating Calcu-  
lation Results” on Page 6.  
• A memory calculation result exceeds 10 digits to the left of  
the decimal point. (The memory contents remain  
unchanged.)  
You try to divide by 0.  
You try to calculate the square root of a negative number.  
If Eappears, press ON/C to clear the error.  
5
 
Estimating Calculation Results  
If you perform a calculation that results in an overflow error, you  
can estimate the correct result (to 10 significant digits) by fol-  
lowing these steps.  
1. Count the number of digits displayed to the left of the deci-  
mal point.  
2. Remove the decimal point.  
3. Add as many zeros to the right of the number as there were  
digits to the left of the decimal point.  
For example, if E 251.0142064 appears, the approximate  
answer is 2,510,142,064,000. If E 17319.70347 appears,  
the approximate answer is 173,197,034,700,000.  
6
 
CALCULATION EXAMPLES  
You can perform basic calculations (addition, subtraction, and  
so on) with this calculator as you would with most other calcula-  
tors. The following sections include examples of more ad-  
vanced calculations.  
Mixed Calculations  
Example: 256 + 378 – 223 × 2.3 ÷ 2.5 + 24 – 36 =  
You Press:  
You See:  
256 + 378 =  
– 223 =  
× 2.3 =  
634.  
411.  
945.3  
378.12  
402.12  
366.12  
÷ 2.5 =  
+ 24 =  
– 36 =  
7
 
Constants  
For multiplication, the first value you enter is the constant. For  
addition, subtraction, and division, the second value you enter is  
the constant.  
Constant:  
2
You Press:  
You See:  
2 × 4 =  
8.  
=
16.  
32.  
9.  
=
6
5
2
3 + 6 =  
=
15.  
21.  
45.  
40.  
35.  
24.  
12.  
6.  
=
50 – 5 =  
=
=
48 ÷ 2 =  
=
=
8
 
Percentage  
Example: 20% of 720 is 144.  
You Press  
You See  
720 × 20 %  
144.  
Add-On  
Example: 30% added to 540 is 702.  
You Press  
540 + 30 %  
You See  
702.  
Discount  
Example: 800 discounted by 20% is 640.  
You Press  
800 – 20 %  
You See  
640.  
9
 
Reciprocal  
Example: 1/8 = 0.125  
You Press  
1 ÷ 8 =  
You See  
0.125  
Exponent  
Example: 76 = 117649  
You Press  
You See  
,
7 × = = = = =  
117 649.  
Square  
Example:42 = 16  
You Press  
You See  
4 × =  
16.  
10  
 
Square Root  
16  
Example:  
= 4  
You Press  
16  
You See  
=
4.  
Memory Calculations  
To store a value in memory, first press ON/C to clear all calcula-  
tions and MC (memory clear) to clear the memory. Then enter  
the number or calculation and press M+.  
Note: Each time you press M+, M, or MR, Mappears in the up-  
per left corner of the display with the number to show that a val-  
ue is stored in memory.  
To add a value to memory, enter the number or calculation you  
want to add, then press M+. The calculator totals the current cal-  
culation and adds that value to memory.  
To subtract a value from memory, enter the number or calcula-  
tion you want to subtract, then press M. The calculator totals  
the current calculation and subtracts that value from memory.  
To recall the value from memory, press MR (memory recall).  
11  
 
Example:  
2392 + 576  
————— – 73 = –64.61582  
786 – 432  
You Press  
You See  
ON/C MC  
786 M+  
432 M–  
2392 +  
576 ÷  
MR  
0.  
M 786.  
M 432.  
,
M 2 392.  
,
M 2 968.  
M 354.  
M 8.38418079  
M –64.61581921  
73 =  
12  
 
CARE  
To enjoy your RadioShack EC-2037 calculator for a long time:  
• Keep the calculator dry. If it gets wet, wipe it dry immedi-  
ately.  
• Use and store the calculator only in normal temperature  
environments.  
• Handle the calculator gently and carefully. Don’t drop it.  
• Keep the calculator away from dust and dirt.  
• Wipe the calculator with a damp cloth occasionally to keep  
it looking new.  
Modifying or tampering with the calculator’s internal compo-  
nents can cause a malfunction and invalidate its warranty. If  
your calculator is not performing as it should, take it to your lo-  
cal RadioShack store for assistance.  
13  
 
REPLACING THE BATTERY  
Although your calculator uses solar power most of the time, the  
backup battery will eventually become weak and need replac-  
ing. If the display speed slows down in a dimly-lit room, replace  
the battery with a RadioShack 389A type button-cell battery.  
Caution: Always use a fresh battery of the required size and  
type.  
1. Use a Phillips screwdriver to remove the two screws on the  
back cover of the calculator, then lift off the cover.  
2. Gently pry out the old battery.  
Warnings:  
• Dispose of the old battery promptly and properly. Do not  
bury or burn it.  
• Do not allow children to play with the battery. Swallowing  
a button cell battery can be fatal.  
3. Position the new battery in the battery compartment so the  
positive (+) side is up.  
4. Replace the back cover, making sure both tabs on the top  
edge of the back cover fit into their respective slots on the  
front case. Then reinsert and tighten the two screws.  
14  
 
SPECIFICATIONS  
Power Source ......................................................... Solar Panel  
or One 389A Button-Cell Battery  
Operating Temperature ......................................... 32° to 104°F  
(0° to 40°C)  
Dimensions (HWD) ....................... 611/16 × 451/64 × 119/64 Inches  
(17 × 12.2 × 3.3 cm)  
Weight (with Battery) ....................................................... 6.7 oz  
(190 g)  
Battery Life .................................................. About 3000 Hours  
Specifications are typical; individual units might vary. Specifica-  
tions are subject to change and improvement without notice.  
15  
 
Limited Ninety-Day Warranty  
This product is warranted by RadioShack against manufacturing defects in material and work-  
manship under normal use for ninety (90) days from the date of purchase from RadioShack  
company-owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS  
PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED  
WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PAR-  
TICULAR PURPOSE, ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN  
LIMITED WARRANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, Ra-  
dioShack 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, PROP-  
ERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSE-  
QUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY  
OF SUCH DAMAGES.  
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or  
limitation of incidental or consequential damages, so the above limitations or exclusions may  
not apply to you.  
In the event of a product defect during the warranty period, take the product and the Ra-  
dioShack 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 with one of the same or similar design; or (c)  
refund the purchase price. All replaced parts and products, and products on which a refund is  
made, become the property of RadioShack. New or reconditioned parts and products may be  
used in the performance of warranty service. Repaired or replaced parts and products are war-  
ranted for the remainder of the original warranty period. You will be charged for repair or re-  
placement 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, accident, misuse, improper or abnormal usage, failure to follow instructions, improper  
installation or maintenance, alteration, lightning or other incidence of excess voltage or current;  
(b) any repairs other than those provided by a RadioShack Authorized Service Facility; (c) con-  
sumables such as fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or in-  
surance 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, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102  
We Service What We Sell  
12/99  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
RS65-634O/M  
12A99  
Printed in Hong Kong  
 

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