# Radio Shack | EC-235 | User's Manual | Radio Shack EC-235 User's Manual

```EC-235 8-Digit Pocket Calculator
lets you use it almost anywhere.
Percentage Key — simplifies discount, percentage, and tax calculations.
Exponential, Square Root,
and Reciprocal Calculations
Calculation
3
Square Root Key — quickly computes the square root of the displayed number.
2 =8
The square root of 2 is 1.4142135
1
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 calculation results.
Protective Wallet — protects the calculator’s keypad.
/8 = 0.125
You Press
You See
2×==
;1
417475468
2
8÷=
31458
Memory Calculations
To store a value in memory, first clear the memory and the display by
pressing M RC (Memory Recall/Clear) twice, then press CE.
To add a value to memory, enter the number or calculation you want to
add, then press M+. The calculator totals the current calculation (if one
is pending) and adds that value to memory.
OPERATION
You can enter basic, mixed, percentage,
To subtract a value from memory, enter the number or calculation you
want to subtract, then press M–. The calculator totals the current calculation (if one is pending) and subtracts that value from memory.
Press ON/C to turn on your calculator.
To recall the value from memory, press M RC once.
If you do not press a key for about 8 minutes,
your calculator automatically turns off. To
turn it off sooner, press OFF.
Calculation Errors
(5525 appears when:
Correcting Entry Errors
• A calculation result exceeds 8 digits. This is an overflow error (see
“Estimating Calculation Results” ).
If you enter an incorrect value, press CE
(Clear Entry) once. Then enter the correct
• A memory calculation result exceeds 8 digits to the left of the decimal point. The memory contents remain unchanged.
To clear the display for a new calculation,
press ON/C (On/Clear) so 31 appears (this also clears the calculator’s
memory). Then begin the new calculation.
• You try to divide by 0.
• You try to calculate the square root of a negative number.
If you press an incorrect operator key (+
+, –, ×, ÷), simply press the correct key and continue your calculation.
If (5525 appears, press ON/C to clear the error.
Constant Calculations
Estimating Calculation Results
For addition, subtraction, and division, the value you enter before
pressing = is the constant. For multiplication, the value you enter before pressing × is the constant.
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.
Calculation
You Press
You See
7 + 3 = 10
5+3=8
7+3=
5=
431
;1
260 × 12.3 = 3198
260 × 4.15 =
260 × 12.3 =
4.15 =
64<;1
43:<1
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 (5525#
(5525# 413475397 appears, the approximate answer is
101,420,640. If (5525#
(5525# 64<1:367: appears, the approximate answer is
31,970,347,000.
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.
Power Source .................................................... One 389A Button-Cell Battery
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.
Battery Life ............................................................................ About 3000 Hours
Operating Temperature ...................................................................... 32–104°F
(0–40°C)
Dimensions (HWD) ................................................. 4 /32 × 2 /32 × /32 Inches
(10.9 × 6.6 × 0.69 cm)
9
19
9
Weight (Including Battery) .......................................................... 2.05 oz (58 g)
Specifications are typical; individual units might vary. Specifications are subject
to change and improvement without notice.
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: Keep button-cell batteries away from children. Swallowing a
button-cell battery can be fatal.
Cautions:
• 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.
1. Using a Phillips screwdriver, remove the four screws on the back
cover of the calculator.
2. To separate the front and back
cover halves, carefully insert and
screwdriver to gently pry out the
battery.
Battery
Holder
3. Position the new battery so the
positive (+) side is up. Slide one
edge of the battery under the tab
on the battery holder, then press
the battery into place.
4. Snap the cover halves back together. Then reinsert and tighten
the screws.
Fort Worth, Texas 76102
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
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 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, 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
65-761 A
11A00
Printed in China
```