Casio 4388 User Manual
MA0802-EA
Operation Guide 4386/4388
About This Manual
Module 4386 Module 4388
• The operational procedures for Modules 4386 and 4388 are identical. All of the
illustrations in this manual show Module 4388.
• 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.
• Button operations are indicated using the letters shown in the illustration.
• For the sake of simplicity, the sample displays in this manual do not show the analog
hands or some design elements of the watch.
• Each section of this manual provides you with the information you need to perform
operations in each mode. Further details and technical information can be found in
the “Reference” section.
General Guide
• Press C to change from mode to mode.
• In any mode (except when a setting screen is on the display), press B to illuminate
the face.
Timekeeping Mode World Time Mode Countdown Timer Mode Stopwatch Mode Alarm Mode Hand Setting Mode
Press .
Timekeeping
This watch features separate digital and analog timekeeping. The procedures for
setting the digital time and analog time are different.
• In the Timekeeping Mode, you can press D to change the display format as shown
below.
Day of the Week Hour : MinutesMonth – Day Seconds
Day of week Seconds Month – Day Hour : Minutes
Digital Time and Date
Use the Timekeeping Mode to set and view a digital display of the current time and date.
When setting the digital time, you can also configure settings for summer time
(Daylight Saving Time or DST), your Home City code (the code for the city where you
normally use the watch), the 12/24-hour format, and the illumination duration.
• This watch is preset with a number of city codes, each of which represents the time
zone where that city is located. When setting the digital time, it is important that you
select the correct city code for your Home City. If your location is not included in the
preset city codes, select the preset city code that is in the same time zone as your
location.
• Note that all of the times for the World Time Mode city codes are displayed in
accordance with the digital time and date settings you configure in the Timekeeping
Mode.
• After you correctly set your Home City time and date, you can set the watch up for
timekeeping with a different city code simply by changing the Home City code in the
Timekeeping Mode.
To set the digital time and date
3. Press C to move the flashing in the sequence shown below to select the other settings.
Seconds DST Home City Code Hour Minutes
Press .
1. In the Timekeeping Mode, hold down A until the
2. Press C twice to move the flashing to the Home City
PM indicator
seconds start to flash, which indicates the setting
screen.
code setting (see the illustration below), and then use
B and D to select the code you want.
• Make sure you select your Home City code before
changing any other setting.
• For full information on city codes, see the “City Code
Tables”.
Day Month Year 12/24-Hour FormatIllumination Duration
4. When the setting you want to change is flashing, use B and D to change it as
described below.
Screen To do this:
Reset the seconds to 00
Toggle between Daylight Saving Time (ON)
and Standard Time (OFF)
Change the Home City code
Change the hour or minutes
Toggle between 12-hour (12H) and 24-hour
(24H) timekeeping
Change the year
Change the month or day
Select three seconds ( ) or one second ( ) as
5. Press A to exit the setting screen.
• Resetting the seconds only (without changing the DST, Home City code, hour, or
• See “Digital Time Daylight Saving Time (DST) Setting” below for details about the
• The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
• For details about illumination duration, see “Illumination”.
Digital Time Daylight Saving Time (DST) Setting
Daylight Saving Time (summer time) advances the digital time setting by one hour
from Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
To toggle the Timekeeping Mode digital time between DST and Standard Time
Setting the Analog Time
Perform the procedure below when the time indicated by the analog hands does not
match the time of the digital display.
To adjust the analog time
the illumination duration
minute setting) causes the analog minute hand setting to be adjusted to match the
seconds count automatically. If you change any of the other settings, you will have
to adjust the hand setting manually.
DST setting.
applied in all modes.
1. In the Timekeeping Mode, hold down A until the seconds
start to flash, which indicates the setting screen.
2. Press C once to display the DST setting screen.
3. Press D to toggle between Daylight Saving Time (
displayed) and Standard Time (OFF displayed).
4. Press A to exit the setting screen.
• The DST indicator appears on the Timekeeping, Alarm,
and Hand Setting Mode to indicate that Daylight Saving
DST indicator
• If you need to advance the analog time setting a long way, hold down D until the
time starts advancing at high speed, and then press B. This locks the highspeed hand movement, so you can release the two buttons. High-speed hand
movement continues until you press any button. It will also stop automatically
after the time advances 12 hours or if an alarm (daily alarm, Hourly Time Signal,
or countdown beeper) starts to sound.
Time is turned on.
1. In the Timekeeping Mode, press C five times to enter
the Hand Setting Mode.
2. Hold down A until the current digital time starts to
flash, which indicates the analog setting screen.
3. Press D to advance the analog time setting by
20 seconds.
• Holding down D advances the analog time setting at
high speed.
Do this:
Press D.
Press D.
Use D (east) and B (west).
Use D (+) and B (–).
Press D.
Use D (+) and B (–).
Press D.
ON
1
Operation Guide 4386/4388
4. Press A to exit the setting screen.
• The watch will automatically adjust the minute hand slightly to match its internal
second count when you exit the setting screen.
• To return to the Timekeeping Mode, press C.
World Time
City code
Current time for
the selected city code
To toggle a city code time between Standard Time and Daylight Saving Time
DST indicator
World Time digitally displays the current time in 27 cities
(29 time zones) around the world.
• All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C.
To view the time in another city
In the World Time Mode, press D to scroll eastwardly
through city codes.
• For full information about city codes, see the “City Code
Table”.
• If the current time shown for a city is wrong, it probably
means there is a problem with your Timekeeping Mode
time and/or Home City code settings. Go to the
Timekeeping Mode and make the necessary
adjustments.
1. In the World Time Mode, use D to display the city code
whose Standard Time/Daylight Saving Time setting you
want to change.
2. Hold down A for about two seconds to toggle between
Daylight Saving Time (DST indicator displayed) and
Standard Time (DST indicator not displayed).
• The DST indicator is on the display whenever you
display a city code for which Daylight Saving Time is
turned on.
• Note that the DST/Standard Time setting affects only the
currently displayed city code. Other city codes are not
affected.
• Note that you cannot switch between Standard Time
and Daylight Saving Time while
city code.
GMT is selected as the
Countdown Timer
The countdown timer can be set within a range of one
minute to 60 minutes. An alarm sounds when the
countdown reaches zero. The countdown timer also has
an auto-repeat feature and a progress beeper that signals
the progress of the countdown.
• All of the operations in this section are performed in the
Countdown Timer Mode, which you enter by pressing
Minutes Seconds
Auto-repeat
When auto-repeat is turned on, the countdown automatically restarts from the
countdown start time when it reaches zero. If left running, the countdown is repeated
a total of eight times, after which it stops automatically.
When auto-repeat is turned off, the countdown stops when it reaches zero and the
display shows the original countdown start time.
• Pressing D while an auto-repeat countdown is in progress pauses the current
countdown. You can resume the auto-repeat countdown by pressing D, or you can
press A to reset to the countdown time starting value.
Countdown Timer Beeper Operations
The watch beeps at various times during a countdown so you can keep informed
about the countdown status without looking at the display. The following describes the
types of beeper operations the watch performs during a countdown.
Countdown End Beeper
The countdown end beeper lets you know when the countdown reaches zero.
• When the progress beeper is turned off, the countdown end beeper sounds for
about 10 seconds, or until you press any button to stop it.
• When the progress beeper is turned on, the countdown end beeper sounds for
about one second.
Progress Beeper
When the progress beeper is turned on, the watch uses beeps to signal countdown
progress as described below.
• Starting from five minutes before the end of the countdown, the watch emits four
short beeps at the top of each countdown minute.
• 30 seconds before the end of the countdown, the watch emits four short beeps.
• The watch emits a short beep for each of the last 10 seconds of the countdown.
• If the countdown start time is six minutes or greater, the watch emits a short beep for
each second of the final 10 seconds before the five-minute point is reached. Four
short beeps are emitted to signal when the five-minute point is reached.
To configure the countdown timer
C.
Configuring the Countdown Timer
The following are the settings you should configure before
actually using the countdown timer.
Countdown start time; Auto-repeat on/off; Progress
beeper on/off
• See “To configure the countdown timer” for information
about setting up the timer.
1. While the countdown start time is on the display in the
Countdown Timer Mode, hold down A until the current
countdown start time starts to flash, which indicates the
setting screen.
• If the countdown start time is not displayed, use the
procedure under “To use the countdown timer” to
display it.
2. Press C to move the flashing in the sequence shown
below to select other settings.
Start Time
Progress Beeper
3. When the setting you want to change is flashing, use
B and D to change it as described below.
Auto-repeat
Setting
Start Time
Auto-repeat
Progress Beeper
4. Press A to exit the setting screen.
• You can also perform steps 1 and 2 of the above procedure whenever you need to
view the current auto-repeat and progress beeper settings.
To use the countdown timer
Screen Button Operation
Use D (+) and B (–) to change the setting.
• You can set a start time in the range of 1 to 60 minutes in
1-minute increments.
Press D to toggle auto-repeat on ( displayed) and off
( displayed).
Press D to toggle the progress beeper on (
(
OF).
Press D while in the Countdown Timer Mode to start the
countdown timer.
• The countdown timer operation continues even if you
exit the Countdown Timer Mode.
• Press D while a countdown operation is in progress to
pause it. Press D again to resume the countdown.
• To completely stop a countdown operation, first pause it
(by pressing D), and then press A. This returns the
countdown time to its starting value.
ON) and off
Stopwatch
Split indicator
Minutes Seconds
To measure times with the stopwatch
Elapsed Time
Start
Split Time
Start
Two Finishes
Start
The stopwatch lets you measure elapsed time, split times,
and two finishes.
• The display range of the stopwatch is 59 minutes,
59 seconds.
• The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
• The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
• Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
• All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing C.
Stop Re-start Stop
Split
(Split indicator
displayed)
Split Stop Split release Clear
First runner
finishes.
Display time of
first runner.
Split release Stop Clear
Second runner
finishes.
Display time of
second runner.
Clear
Alarms
Alarm number
Alarm time
(Hour : Minutes)
To set an alarm time
• To set a one-time alarm, display one of the screens indicated by an alarm number
from
AL1through AL4. To set the snooze alarm, display the screen indicated
by
SNZ.
• The snooze alarm repeats every five minutes.
2. After you select an alarm, hold down A until the hour setting of the alarm time
starts to flash, which indicates the setting screen.
• This operation automatically turns on the alarm.
3. Press C to move the flashing between the hour and minute settings.
4. While a setting is flashing, use D (+) and B (–) to change it.
• When setting the alarm time using the 12-hour format, take care to set the time
correctly as a.m. (no indicator) or p.m. (P indicator).
5. Press A to exit the setting screen.
Alarm Operation
The alarm sounds at the preset time for about 20 seconds, regardless of the mode the
watch is in. In the case of the snooze alarm, the alarm operation is performed a total
of seven times, every five minutes, or until you turn the alarm off.
• Alarm and Hourly Time Signal operations are performed in accordance with the
Timekeeping Mode digital time.
• To stop the alarm tone after it starts to sound, press any button.
• Performing any one of the following operations during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen
Displaying the
You can set five independent Daily Alarms. When an
alarm is turned on, the alarm tone sounds when the alarm
time is reached. One of the alarms is a snooze alarm,
while the other four are one-time alarms.
You can turn on an Hourly Time Signal that causes the
watch to beep twice every hour on the hour.
• There are six screens in the Alarm Mode. Four are for
one-time alarms (indicated by numbers from
AL1through AL4), one is for a snooze alarm
(indicated by
Signal (indicated by
• All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
1. In the Alarm Mode, use D to scroll through the alarm
screens until the one whose time you want to set is
displayed.
SNZ
setting screen
SNZ), and one is for the Hourly Time
SIG).
2
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