Radio Shack EC2037 User Manual
Cat. No.
OWNER’S MANUAL
Please read before using this equipment.
Metal Case Desktop Calculator
with Tilt Display
FEATURES
Your RadioShack
Large
Adjustable Tilt Display — lets you adjust the display to the best viewing angle.
Percentage Calculation — simplifies discount, percentage change, and tax calculations.
Automatic
Square Root Function — quickly computes the square root of the displayed number.
+/– Key — changes the sign of the displayed number.
© 1999 Tandy Corporation.
All Rights Reserved.
RadioShack is a registered trademark used by Tandy Corporation.
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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 
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Discount ...................................................................  9 
Reciprocal ..............................................................  10 
Exponent ................................................................  10 
Square ....................................................................  10 
Square Root ............................................................  11 
Memory Calculations ...............................................  11 
Care ......................................................................................  13 
Replacing the Battery .........................................................  14 
Specifications .....................................................................  15 
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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 calculator automatically turns off. To turn it off sooner, press OFF.
USING THE +/– KEY
Press +/– to change the displayed number from positive to negative or from negative to positive. When the number is negative,
– appears on the left side of the display.
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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 (+,
E appears in the lower left corner when:
•A calculation result exceeds 10 digits to the left of the decimal point. This is an overflow error. See “Estimating Calculation 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 E appears, pressON/C to clear the error.
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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 following these steps.
1.Count the number of digits displayed to the left of the decimal 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. IfE 17319.70347 appears, the approximate answer is 173,197,034,700,000.
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CALCULATION EXAMPLES
You can perform basic calculations (addition, subtraction, and so on) with this calculator as you would with most other calculators. The following sections include examples of more advanced calculations.
Mixed Calculations
Example: 256 + 378 – 223 × 2.3 ÷ 2.5 + 24 – 36 =
You Press:  You See: 




256 + 378 =  634. 


– 223 =  411. 


× 2.3 =  945.3 


÷ 2.5 =  378.12 


+ 24 =  402.12 


– 36 =  366.12 


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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:  You Press:  You See: 






2  2 × 4 =  8. 



 =  16. 



 =  32. 



6  3 + 6 =  9. 



 =  15. 



 =  21. 



5  50 – 5 =  45. 



 =  40. 



 =  35. 



2  48 ÷ 2 =  24. 



 =  12. 



 =  6. 



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Percentage
Example: 20% of 720 is 144.
You Press  You See 




720 × 20 %  144. 


Example: 30% added to 540 is 702.
You Press  You See 




540 + 30 %  702. 


Discount
Example: 800 discounted by 20% is 640.
You Press  You See 




800 – 20 %  640. 


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Reciprocal
Example: 1/8 = 0.125
You Press  You See 




1 ÷ 8 =  0.125 


Exponent
Example: 76 = 117649
You Press  You See 
7 × = = = = =  , 
117 649. 
Square
Example:42 = 16
You Press  You See 




4 × =  16. 


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Square Root
Example: 16 = 4
You Press  You See  








16 
 =  4. 
 




Memory Calculations
To store a value in memory, first press ON/C to clear all calculations andMC (memory clear) to clear the memory. Then enter the number or calculation and pressM+.
Note: Each time you pressM+,
To add a value to memory, enter the number or calculation you want to add, then press M+. The calculator totals the current calculation and adds that value to memory.
To subtract a value from memory, enter the number or calculation you want to subtract, then press
To recall the value from memory, press MR (memory recall).
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Example:
2392 + 576
You Press  You See 




ON/C MC  0. 


786 M+  M 786. 


432 M–  M 432. 
 , 
2392 +  M 2 392. 
 , 
576 ÷  M 2 968. 


MR  M 354. 


–  M 8.38418079 


73 =  M 


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CARE
To enjoy your RadioShack
•Keep the calculator dry. If it gets wet, wipe it dry immediately.
•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 components can cause a malfunction and invalidate its warranty. If your calculator is not performing as it should, take it to your local RadioShack store for assistance.
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REPLACING THE BATTERY
Although your calculator uses solar power most of the time, the backup battery will eventually become weak and need replacing. If the display speed slows down in a
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.
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SPECIFICATIONS
Power Source .........................................................  Solar Panel 
 or One 389A 
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. Specifications are subject to change and improvement without notice.
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Limited
This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for ninety (90) days from the date of purchase from RadioShack
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 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 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 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) 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) consumables such as fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs of product removal, installation,
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 
 
12A99  Printed in Hong Kong 