Casio DS-1L - User Manual

DS-1L/2L/3L
Operating Instructions
Bedienungsanleitung
Mode d’emploi
Instrucciones de operacion
Istruzioni per l’uso
F
EGFSI Printed in Japan/Imprimé au Japon
A900 12-O32007C
1/General Guide
*All examples in these instructions show DS-3L.
@ Main Key Functions
Sign Change Key
Switches the sign of the displayed value between positive (+) and negative (- ).
(=) Right Shift Key
Shifts the displayed value to the right, deleting the far right digit.
Example: | Operation Display
To change 1234 to 1235 Homa 1'234
(=)(Deletes 4) 123. |
5) 1'235. |
{4s} Time Key
¢ Specifies input value as a time (sexagesimal) value.
e Switches the displayed value between decimal and time (sexagesimal) format.
F CUT UP 5/4 7
o> Rounding Selector
Specifies the rounding system.
F: Floating decimal point system, which displays the value without rounding.
CUT: Cuts off the decimal to the specified* number of places.
UP: Rounds up the decimal to the specified” number of places.
5/4: Rounds off the decimal to the specified* number of places.
*Use the decimal place selector to specify the number of decimal places.
4321 0 ADD:
@ 7 Decimal Place Selector
Specifies the number of decimal places for rounding. Note that the decimal place selec-
tor
is
valid
whenever
the
rounding
selector
is
in
any
position
other
than
F.
4, 3, 2, 1, 0: Number of decimal places for the CUT, UP and 5/4 setting of the Round-
ing Selector.
@WeError Indicator
The error indicator “‘E” appears on the display whenever any of the following condi-
tions exist. To clear an error, press &@ to clear the error and continue with the calcula-
tion,
or
to
clear
the
entire
calculation.
* Whenever the integer part (the value to the left of the decimal point) of a calcula-
tion’s intermediate result or final result becomes greater than 14 digits (12 digits with
the DS-2L, 10 digits with the DS-1L). Along with the error indicator, an approxima-
tion of the value appears on the display. The following table illustrates the value that
appears when you attempt to perform the calculation: 123,456,789 x 7,418,529 :,
915,867,769,443,380
Model Display
_ DS-3L 9.158677694433E
DS-2L_ | — 915.867769443
DS-1L E 91'586.77694
*
Whenever
the
integer
part
of
the
value
stored
in
independent
memory
or
grand
total
memory
is
greater
than
14
digits
(12
digits
with
the
DS-2L,
10
digits
with
the
DS-1L).
At
this
time,
the
display
shows
“‘0.”,
but
the
memory
retains
the
value
it
had
before
the
overflow
occurred.
¢
Whenever
an
attempt
is
made
to
perform
division
by
zero
(as
in
6
GJ
0).
* Whenever the profit in a mark-up calculation is 100%.
¢ Whenever an attempt is made to calculate the square root of a negative value.
3/Power Supply
The Two-Way Power System of this calculator uses a solar cell, in addition to one
CR2025 lithium battery. Unlike calculators equipped with a solar cell only, you can
use this calculator under virtually any lighting conditions, as long as there is enough
light for you to read the display.
Battery Replacement
Do not try to replace the battery yourself. Have it replaced by an authorized CASIO
dealer or service center.
If the display becomes dim and difficult to read, or if nothing appears on the display
when you press (especially when lighting is dim), you probably need to have the
battery replaced.
* Have the battery replaced at least once every seven years, regardless of how much
you use the calculator during that time.
* The battery installed at the factory discharges during shipment and storage. You may
need to replace the original battery sooner than seven years after you purchase the
calculator.
¢ A dead battery can leak and damage the calculator if left in the battery compartment
for long periods.
eEven if the battery goes dead, you can still use the calculator under solar power.
Remember, however, that memory contents will be cleared if available light drops
below a certain level while there is no battery power.
M@ Auto Power Off Function
This calculator is not equipped with an OFF switch. Instead, it switches power off au-
tomatically about six minutes after the last key operation is performed. To restore power,
press egg. Even if the Auto Power Off function operates to clear memory, the contents
of the independent memory are not cleared.
4/Important Precautions

Summary

General Guide

Main Key Functions

Details the functions of key buttons like Sign Change, Right Shift, Time Key, Rounding Selector, Decimal Place Selector.

Time Key Functionality

Explains how to input time values and switch between decimal and sexagesimal formats.

Rounding Selector Options

Describes F (floating), CUT, UP, and 5/4 rounding methods for decimal places.

Decimal Place Selector

Specifies the number of decimal places for rounding, valid for CUT, UP, 5/4 settings.

Grand Total Memory Selector

Explains how to use the Grand Total Memory selector (ON/OFF) to add results to memory.

Understanding the Display

Details the various indicators and symbols shown on the calculator display.

Power Supply and Battery

Two-Way Power System

Details the calculator's power source: solar cell and CR2025 lithium battery.

Battery Replacement Guidelines

Advises on when and how to replace the battery, recommending authorized service.

Auto Power Off Function

Explains the automatic power-off feature to conserve battery life.

Correcting Input Errors

Clearing Input and Calculations

Methods for clearing current input, digit-by-digit shifts, and entire calculations.

Important Precautions and Safety

Handling and Environmental Safety

Precautions against heat, cold, moisture, dust, dropping, bending, and improper cleaning.

Usage and Maintenance Warnings

Instructions on not disassembling, using sharp objects on keys, and cleaning procedures.

Specifications

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

The Casio DS-1L/2L/3L is a robust desktop calculator designed for a variety of mathematical operations, featuring a two-way power system and a comprehensive set of functions for precise calculations. Its core functionality revolves around basic arithmetic, but it extends to more specialized features like rounding, time calculations, and memory functions, making it suitable for both general and professional use.

Function Description

The calculator offers standard arithmetic operations (addition, subtraction, multiplication, division) and includes dedicated keys for efficiency. The "Sign Change Key" allows users to switch the sign of the displayed value between positive and negative, which is useful for calculations involving negative numbers or for correcting input. The "Right Shift Key" provides a convenient way to edit input by shifting the displayed value to the right and deleting the far-right digit, enabling quick corrections without re-entering the entire number.

A key feature is its "Rounding Selector," which offers multiple rounding systems. Users can choose between "Floating decimal point system" (F), which displays values without rounding, "CUT" (cuts off decimals), "UP" (rounds up decimals), and "5/4" (rounds off decimals). The "Decimal Place Selector" complements this by allowing users to specify the number of decimal places (0, 1, 2, 3, or 4) for rounding, providing precise control over the output format. This is particularly useful in financial or scientific contexts where specific decimal precision is required.

The "Add Mode" (ADD2) is a specialized feature that automatically adds a decimal point and two decimal places to all values, even if not explicitly input. This mode is highly beneficial for calculations involving currency or other monetary systems that typically require two decimal places. However, it's important to note that this mode does not apply if the decimal point key is pressed during input or for operations other than addition and subtraction.

The calculator also incorporates "Grand Total Memory" functionality, controlled by the GT-OFF/ON selector. When set to ON, the result of each calculation is automatically added to the grand total memory, facilitating cumulative calculations. When OFF, the result is not added to the grand total. This feature is useful for summing up multiple individual results without manual accumulation.

The display provides clear indicators for various statuses, including a 3-digit separator ('), a seconds indicator ("), and specific indicators for Grand Total (GT), Independent Memory (M), Error (E), Negative value (-), Constant calculation (K), and arithmetic operations (+, -, ×, ÷). These indicators help users monitor the calculator's state and the nature of the ongoing calculation.

Error handling is built into the system. An "E" indicator appears on the display if the integer part of an intermediate or final result exceeds the digit capacity (14 digits for DS-3L, 12 for DS-2L, 10 for DS-1L), if independent or grand total memory overflows, if division by zero is attempted, if profit in a mark-up calculation reaches 100%, or if a square root of a negative value is calculated. To clear an error, users can press C to clear the error and continue, or AC to clear the entire calculation.

Usage Features

The calculator is designed for user-friendly operation with clear key functions and display indicators. Correcting input errors is straightforward: pressing C clears the last input value, while the right shift key allows for digit-by-digit correction. For time calculations, if an incorrect hour, minute, or second is entered before pressing the HMS key, simply input the correct values. If an error occurs after pressing HMS, pressing C clears the time input, allowing the user to start over. Similarly, if a wrong arithmetic operation key is pressed, simply press the correct key before any further input.

Clearing calculations is managed by two main functions: AC clears the entire calculator (except independent memory), and MC clears only the independent memory. This distinction allows users to reset specific parts of the calculator without losing important stored values.

Maintenance Features

The Casio DS-1L/2L/3L features a "Two-Way Power System," utilizing both a solar cell and one CR2025 lithium battery. This ensures reliable operation under various lighting conditions. Unlike solar-only calculators, it can function even in dim light as long as there's enough light to read the display.

Battery replacement is recommended by an authorized CASIO dealer or service center, rather than attempting it oneself. The display becoming dim or difficult to read, or the calculator failing to power on (especially in dim lighting), indicates a need for battery replacement. It's advised to replace the battery at least once every seven years, regardless of usage frequency, as the factory-installed battery may discharge during shipment and storage, potentially requiring earlier replacement. A dead battery left in the compartment for extended periods can leak and damage the calculator. Even with a dead battery, the calculator can still operate on solar power, though memory contents will be cleared if available light drops below a certain level without battery power.

The calculator includes an "Auto Power Off Function" to conserve power. It automatically switches off approximately six minutes after the last key operation. To restore power, users simply press the ON key. Importantly, even if the auto power off function clears general memory, the contents of the independent memory are retained.

For cleaning, the exterior should be wiped with a soft cloth dampened in a weak solution of a mild neutral detergent and water. It's crucial to wring out any excess moisture from the cloth before wiping. Benzene, thinner, or other volatile agents should not be used, as they can damage the printed figures on the case or its finish.

Important precautions include avoiding direct flame, extreme temperatures (direct sunlight, near heaters), excessive moisture, dirt, and dust. Dropping, bending, twisting, or attempting to disassemble the calculator should be avoided. Users should also refrain from using sharp objects to press keys. These measures help ensure the longevity and proper functioning of the device.

Casio DS-1L Specifications

General

Display	LCD
Display Digits	8 digits
Type	Basic
Functions	Basic arithmetic, square root
Power Source	Solar and Battery
Key Features	large display, dual power