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Casio printing calculator dr t220 Manual

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3. Back-up Battery
This calculator comes with a built-in memory back-up battery that provides power to retain the values stored in memory
when the calculator is not plugged in to an AC power outlet. The memory back-up battery requires periodic replacement,
about once every 11 months. After that time, input data may change or be deleted while you are using the calculator.
About once every 11 months, take the calculator to an authorized CASIO dealer or service center to have the back-up
battery replaced.
Caution
Incorrectly replacing the battery creates the risk of explosion.
Replace only with battery type CR2032 or equivalent recommended by the manufacturer.
Dispose of used batteries according to the manufacturer’s instructions.
4. RESET Button
•Pressing the RESET button deletes calculation memory contents, independent memory contents, grand total memory
contents, etc. Be sure to keep separate records of all important settings and numeric data to protect against accidental
loss.
•Press the RESET button on the back of the calculator to restore normal operation whenever the calculator does not
operate correctly. If pressing the RESET button does not restore normal operation, contact your original retailer or
nearby dealer.
5. About the Selectors
Function Selector
OFF: Power is off.
ON: Power is on, but no printing is performed except when : is pressed to print a reference number. Calculations
appear on the display only.
PRINT: Power is on and printing is activated. Calculations also appear on the display.
ITEM: Power is on and printing is activated. The total number of addition and subtraction items is printed with the result
when : and
* are pressed. The number of * operations is printed with the result when G is pressed.
Decimal Mode Selector
F: Floating decimal
CUT: Cut off to the number of decimal places specified by the Decimal Place Selector setting.
UP: Round up to the number of decimal places specified by the Decimal Place Selector setting.
5/4: Cut off (0, 1, 2, 3, 4) or round up (5, 6, 7, 8, 9) to the number of decimal places specified by the Decimal Place
Selector setting.
Important!
All input and calculations are rounded for addition and subtraction. For multiplication and division, the calculation is
performed with values as input, and the result is rounded.
Decimal Place Selector
6, 4, 3, 2, 1, 0: Number of decimal places
ADD
2
, ADD
2
+: See ‘‘12. ADD Mode Calculations’’.
6. Errors
The following conditions cause the error symbol “E” to appear on the display. Clear the error as indicated and continue.
Independent memory contents are retained when an error is cleared.
•Whenever the integer part of a result (whether intermediate or final) is longer than 12 digits.
In this case, the display shows the 12 most significant digits of the result. The true decimal point of the result is 12 places
to the right of the decimal position shown in this display. Clear the entire calculation by pressing v.
•Whenever the integer part of a total being accumulated in memory is longer than 12 digits.
Clear the entire calculation by pressing v.
•Attempting to calculate an average while the item count is 000 causes an error. When the item count reaches 999, the
next operation that adds to item count makes it 000.
Clear the entire calculation by pressing v.
… 5 …


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