Radio Shack EC-235 User Manual
EC-235 8-Digit Pocket Calculator
OWNER’S MANUAL — Please read before using this equipment.
Your RadioShack EC-235 8-Digit Pocket Calculator’s compact size
lets you use it almost anywhere.
Percentage Key
— simplifies discount, percentage, and tax calcula-
tions.
Square Root Key
— quickly computes the square root of the dis-
played number.
Constant Calculations —
let you add, subtract, divide, or multiply the
same number over and over without having to re-enter that number.
Large 8-Digit Liquid Crystal Display
— makes it easy to read calcu-
lation results.
Protective Wallet
— protects the calculator’s keypad.
OPERATION
You can enter basic, mixed, percentage,
add-on, and discount calculations.
Press
If you do not press a key for about 8 minutes,
your calculator automatically turns off. To
turn it off sooner, press
to turn on your calculator.
ON/C
OFF
.
Exponential, Square Root,
and Reciprocal Calculations
Calculation You Press You See
3
2
= 8 2
The square root of 2 is 1.4142135 2
1
/8 = 0.125 8
××××
= =
÷
÷
÷ ÷
;1
;1
;1;1
417475468
417475468
417475468417475468
=
31458
31458
3145831458
Memory Calculations
To store a value in memory, first clear the memory and th e display by
pressing (Memory Recall/Clear) twice, then press CE.
To add a value to memory, enter the number or calculation you want to
add, then press
is pending) and adds that value to memory.
To subtract a value from memory, enter the number or calculation you
want to subtract, then press
lation (if one is pending) and subtracts that value from memory.
To recall the value from memory, press once.
R
M
C
. The calculator totals the current calculation (if one
M+
+
++
. The calculator totals the current calcu-
M–
R
M
C
Calculation Errors
Correcting Entry Errors
If you enter an incorrect value, press
(Clear Entry) once. Then enter the correct
value and continue your calculation.
To clear the display for a new calculation,
press
(On/Clear) so
ON/C
appears (this also clears the calculator’s
31
31
3131
memory). Then begin the new calculation.
If you press an incorrect operator key (
rect key and continue your calculation.
CE
,
), simply press the cor-
,
××××, ÷÷÷÷
++++
–
Constant Calculations
For addition, subtraction, and division, the value you enter before
pressing
fore pressing
is the constant. For multiplication, the value you enter be-
====
is the constant.
××××
Calculation You Press You See
7 + 3
10
5 + 3
260 × 12.3
260 × 4.15
====
====
8
3198
====
7 + 3
====
5
====
260
12.3
××××
====
4.15
====
====
431
431
431431
;1
;1
;1;1
64<;1
64<;1
64<;164<;1
43:<1
43:<1
43:<143:<1
appears when:
(5525
(5525
(5525(5525
• A calculation result exceeds 8 digits. This is an overflow error (see
“Estimating Calculation Results” ).
• A memory calculation result exceeds 8 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
appears, press
(5525
(5525
(5525(5525
to clear the error.
ON/C
Estimating Calculation Results
If you perform an operation that results in an overflow error, you can
estimate the correct result (to 8 significant digits) by following these
steps.
1. Count the number of digits 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
101,420,640. If
31,970,347,000.
(5525
(5525#### 413475397
413475397
(5525(5525
413475397413475397
(5525
(5525####64<1:367:
64<1:367 :
(5525(5525
64<1:367 :64<1: 367:
appears, the approximate answer is
appears, the approximate answer is
2000 RadioShack Corporation.
©
RadioShack and RadioShack.com are trademarks used by RadioShack Corporation.
All Rights Reserved.
CARE
SPECIFICATIONS
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 carefully; do not drop it. Keep the calculator away from
dust and dirt, and wipe it with a damp cloth occasionally to keep it looking new.
Modifying or tampering with the calculator’s internal components can
cause a malfunction and might invalidate its warranty. If your calculator is not performing as it should, take it to your local RadioShack store
for assistance.
Replacing the Battery
If the display dims or the calculator speed slows down, replace the battery with a 389A type button-cell battery. For the best performance and
longest life, we recommend RadioShack alkaline batteries.
Warning:
button-cell battery can be fatal.
Cautions:
1. Using a Phillips screwdriver, remove the four screws on the back
2. To separate the front and back
3. Position the new battery so the
4. Snap the cover halves back together. Then reinsert and tighten
Keep button-cell batteries away from children. Swallowing a
• Use only a fresh battery of the required size and type.
• Always remove an old or weak battery. Batteries can leak chemicals that can destroy electronic parts.
• Dispose of the old battery promptly and properly. Do not burn or
bury it.
cover of the calculator.
cover halves, carefully insert and
twist a flat-blade screwdriver
Battery
Holder
between them.Use a flat-blade
screwdriver to gently pry out the
battery.
positive (+) side is up. Slide one
edge of the battery under the tab
on the battery holder, then press
the battery into place.
the screws.
Power Source .................................................... One 389A Button-Cell Battery
Battery Life ............................................................................ About 3000 Hours
Operating Temperature ...................................................................... 32–104°F
9
×
32
/
Dimensions (HWD) ................................................. 4
Weight (Including Battery) .......................................................... 2.05 oz (58 g)
Specifications are typical; individual units might vary. Specifications are subject
to change and improvement without notice.
219/
(10.9
(0–40°C)
9
×
32
32
/
Inches
× 6.6 × 0.69 cm)
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
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 BE EN
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
RadioShack sales receipt as proof of purchase date to any RadioShack store.
RadioShack will, at its option, unless otherwise provided by law: (a) correct t he 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, 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 Corporation
Fort Worth, Texas 76102
A
65-761
11A00
Printed in China
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