MA1812-EA
© 2019 CASIO COMPUTER CO., LTD.
Operation Guide 3472
About This Manual
x Depending on the model of your watch, display text
appears either as dark figures on a light background, or
light figures on a dark background. All sample displays
in this manual are shown using dark figures on a light
background.
x Button operations are indicated using the letters shown
in the illustration.
x Each section of this manual provides you with the
information you need to perform operations in each mode.
x To ensure that this watch provides you with the years of
service for which it is designed, carefully read and follow
the instructions under “Operating Precautions” and “User
Maintenance”.
x Be sure to keep all user documentation handy for future
reference.
E
Contents
General Guide ......................................................................................................E-4
Timekeeping ......................................................................................................... E-6
Alarm ..................................................................................................................... E-8
Stopwatch .......................................................................................................... E-11
Time Setting .......................................................................................................E-13
Specifications..................................................................................................... E-15
Operating Precautions ......................................................................................E-16
User Maintenance .............................................................................................. E-26
E-2
General Guide
x Press B to change from mode to mode.
x After you perform an operation in any mode, pressing B returns to the Timekeeping
Mode.
Timekeeping Mode Alarm Mode
x Note that the product illustrations in this manual are intended for reference only,
and so the actual product may appear somewhat different than depicted by an
illustration.
Procedure Lookup
The following is a handy reference list of all the operational procedures contained
in this manual.
To toggle between 12-hour and 24-hour timekeeping .....................................E-7
To set the alarm time...........................................................................................E-8
To stop the alarm .............................................................................................. E-10
To switch the Daily Alarm and Hourly Time Signal on and off ....................... E-10
To test the alarm ................................................................................................ E-10
To measure times with the stopwatch ............................................................. E-12
To set the time and date ...................................................................................E-13
x The watch returns to the Timekeeping Mode automatically if you do not perform any
button operation for one or two minutes in the Alarm Mode and Time Setting Mode.
x In any mode, press A to illuminate the display.
Stopwatch Mode Time Setting Mode
E-1
E-3
E-4
Timekeeping
PM indicator
Day of week
Day
Hour : Minutes Seconds
E-6
Alarm
Alarm on indicator
Hourly time signal
on indicator
Alarm time
(Hour : Minutes)
Mode indicator
E-8
B
Use the Timekeeping Mode to view the current time and
date.
x Day of the week is displayed as follows.
SU : Sunday MO : Monday
TU : Tuesday WE : Wednesday
TH : Thursday FR : Friday
SA : Saturday
x The watch does not make any allowance for leap years.
Be sure to manually set February 29 when one occurs
during a leap year.
When the Daily Alarm is turned on, the alarm sounds for
20 seconds at the preset time each day. When the Hourly
Time Signal is turned on, the watch beeps every hour on
the hour.
x All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing B (page E-4).
To set the alarm time
1. In the Alarm Mode, press A. The hour digits flash
because they are selected.
x This operation automatically turns on the alarm.
B
B
B
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press C to switch between the 12-hour and 24-hour
formats.
x With the 12-hour format, the PM indicator appears for times in the range of noon to
11:59 p.m. and no indicator appears for times in the range of midnight to 11:59 a.m.
x With the 24-hour format, times are displayed in the range of 0:00 to 23:59, with 24H
indicator.
2. Press A to change the selection in the following sequence.
Hour
AA
Normal Alarm Mode (No digit flashes)
3. Press C to increase the selected digits. Holding down C changes the number
at high speed.
x The format (12-hour and 24-hour) of the alarm time matches the format you select
for normal timekeeping.
x When setting the alarm time using the 12-hour format, take care to set the time
correctly as morning or afternoon (PM).
4. After you set the alarm time, use A to return to the Alarm Mode.
x If you do not operate any button for one or two minutes while a selection is flashing,
the flashing stops and the watch goes back to the Timekeeping Mode automatically.
A
Minutes
E-5
E-7
E-9
Operation Guide 3472
To stop the alarm
Press any button to stop the alarm after it starts to sound.
To switch the Daily Alarm and Hourly Time Signal on and off
Press C while in the Alarm Mode to change the status of the Daily Alarm and
Hourly Time Signal in the following sequence.
Both on Both off Daily Alarm only Hourly Time
To test the alarm
Hold down C while in the Alarm Mode to sound the alarm.
E-10
To measure times with the stopwatch
(a) Elapsed time measurement
C C C C A
Start Stop Resume Stop Clear
(b) Split time measurement
C A A C A
Start Split
(c) Split time and 1st-2nd place times
C A C A A
Start Split
E-12
3. While the second’s digits are selected (flashing), press C to reset the seconds
to
seconds are reset to
the range of 00 to 29, the minute’s count is unchanged.
4. While any other digits (besides seconds) are selected (flashing), press C
to increase the number. While the day of the week is selected, pressing C
advances to the next day. Holding down C changes the current selection at
high speed.
5. After you set the time and date, press B to return to the Timekeeping Mode.
x If you do not operate any button for one or two minutes while a selection is flashing,
the flashing stops and the watch goes back to the Timekeeping Mode automatically.
E-14
(SPL displayed)
First runner
finishes.
Display time of
first runner.
. If you press C while the second’s count is in the range of 30 to 59, the
Split release Stop Clear
Stop
Second runner
finishes.
and 1 is added to the minutes. If the second’s count is in
Split release
Display time of
second runner.
Signal only
Clear
Stopwatch
Mode indicator
Minutes
Seconds
1/100 second
The Stopwatch Mode lets you measure elapsed time,
split times, and two finishes. The range of the stopwatch
is 59minutes, 59.99 seconds.
x The stopwatch continues to run, restarting from zero after
it reaches its limit, until you stop it.
x An ongoing elapsed time measurement operation will
continue internally even if you change to another mode.
However, if you exit the Stopwatch Mode while a split
time is displayed, the split time will not be displayed when
you return to the Stopwatch Mode.
x All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing B (page
E-5).
Time Setting
PM indicator
Day of week
Hour : Minutes Seconds
Use the Time Setting Mode to set the current time and
date.
Day
To set the time and date
1. Use B to enter the Time Setting Mode (page E-5).
x The second’s digits flash because they are selected.
2. Press A to change the selection in the following
sequence.
Seconds
A
Day of
the Week
AA
Hour
Day
AA
Specifications
Accuracy at normal temperature: ±30 seconds a month
Timekeeping: Hour, minutes, seconds, p.m., day, and day of the week
Time system: Switchable between 12-hour and 24-hour formats
Calendar system: Auto-calendar set at 28 days for February
Alarm: Daily alarm, Hourly time signal
Stopwatch
Measuring units: 1/100 seconds
Measuring capacity: 59 minutes, 59.99 seconds
Measuring modes: Elapsed time, split time, and two finishes
Illumination: LED (light-emitting diode)
Battery: One lithium battery
Type: CR1616
Battery life: Approx. 3 years
x 1 second of illumination operation per day
x 20 seconds of alarm operation per day
Specifications are subject to change without notice.
E-11
Minutes
A
Month
E-13
E-15