© 2023 CASIO COMPUTER CO., LTD.
MA2303-A
User’s Guide
Watch
3556 EN
EN-2
Contents
About This Manual................................................................................................ EN-1
Watch Features ..................................................................................................... EN-6
Selecting a Mode .................................................................................................. EN-7
Timekeeping ......................................................................................................... EN-9
Stopwatch ........................................................................................................... EN-14
Preset Timer ........................................................................................................ EN-19
Countdown Timer ............................................................................................... EN-23
World Time .......................................................................................................... EN-30
Alarm ................................................................................................................... EN-32
Illumination .......................................................................................................... EN-35
Reference ............................................................................................................ EN-36
Specifications ..................................................................................................... EN-42
EN-4
Procedure Lookup
The following is a handy reference list of all the operational procedures contained in
this manual.
To set the time and date .................................................................................... EN-10
To toggle the Timekeeping Mode time between DST and Standard Time ... EN-12
To toggle between 12-hour and 24-hour timekeeping ................................... EN-13
To measure times with the stopwatch ............................................................. EN-15
To set the event time ......................................................................................... EN-17
To start timing at the beginning of an event ................................................... EN-17
To pause timing .................................................................................................. EN-18
To reset elapsed time measurement to zero ................................................... EN-18
To perform a preset timer operation ................................................................ EN-20
To configure countdown timer settings ........................................................... EN-24
To perform a countdown timer operation ........................................................ EN-28
To view the time for another city code............................................................. EN-30
EN-5
To toggle a city code time
between Standard Time and Daylight Saving Time .................................... EN-31
To set the alarm time ......................................................................................... EN-32
To stop the alarm tone after it starts to sound .............................................. EN-33
To switch the Daily Alarm and Hourly Time Signal on and off ....................... EN-34
To test the alarm ................................................................................................ EN-34
To illuminate the display .................................................................................... EN-35
To turn the button operation tone on and off ................................................. EN-38
EN-6
Watch Features
◆
Stopwatch
◆
Preset Timer
◆
Countdown Timer
◆
World Time
◆
Alarm
EN-7
Selecting a Mode
• 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 display.
C
Timekeeping Mode Stopwatch Mode Preset Timer Mode
C
C
EN-8
World Time ModeAlarm Mode
Countdown Timer
Mode
CC
C
EN-9
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date.
Read This Before You Set the Time and Date !
The times displayed in the Timekeeping Mode and World
Time Mode are linked. Because of this, make sure you
select a city code for your Home City (the city where you
normally use the watch) before you set the time and date.
• For full information on city codes, see the “City Code
Table” at the back of this manual.
Day of week
Second
Hour : Minute
PM indicator
Month – Day
EN-10
To set the time and date
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C to move the flashing in the sequence shown
below to select other settings.
Second DST City Code Hour
C C C C
C
Day
Month Year Minute
C C C
EN-11
3. When the setting you want to change is flashing, use D and B to change it as
described below.
Screen To do this: Do this:
Reset the second to 00
Press D.
Toggle between Daylight Saving Time (On)
and Standard Time (OFF)
Change the city code
Use D (east) and B (west).
Change the hour or minute
Use D (+) and B (–).
Change the year
Change the month or day
• See “Daylight Saving Time (DST)” on page EN-12 for details about the DST
setting.
4. Press A to exit the setting screen.
EN-12
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the 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 time between DST and Standard Time
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C to display the DST setting screen.
3. Press D to toggle between Daylight Saving Time (On
displayed) and Standard Time (OFF displayed).
4. Press A to exit the setting screen.
• The DST indicator is on the display while Daylight Saving
Time is turned on.
DST indicator
EN-13
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press D to toggle between 12-hour timekeeping and
24-hour timekeeping.
• With the 12-hour format, the P (PM) indicator appears for times in the range of noon
to 11:59 p.m. and no indicator appears to the left of the hour digits for times in the
range of midnight to 11:59 a.m.
• With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
• The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
• The P indicator is not displayed with the Timekeeping Mode time on the Preset
Timer Mode, Countdown Timer Mode, World Time Mode, and Alarm Mode screens.
EN-14
Stopwatch
The stopwatch lets you measure elapsed time. The upper
display and lower display can be used for official timing of
an event or game.
• The measurement range of the upper display is
59minutes 59seconds.
• The measurement range of the lower display is
99minutes 59seconds.
• 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.
• All of the operations in this section are performed in
the Stopwatch Mode, which you enter by pressing C
(page EN-7).
Timekeeping Mode time
Initial Stopwatch Mode
Screen
EN-15
• This time measurement (1/100 second)
cannot be paused.
Elapsed Time Screen
Minutes Seconds
• Press D to pause and
resume elapsed time
measurement.
Minutes Seconds
• This time measurement
cannot be paused.
It shows the total elapsed
time since the timing
operation started.
To measure times with the stopwatch
Elapsed Time
D D D D
Hold down A
Start Stop*
1
Resume Stop*
1
Reset
*1 Elapsed time measurement in the lower display continues.
EN-16
Using the Watch for Official Timing of a Sport Event
After you set a game or event time, the watch will sound an alarm when the time in
the lower display reaches that time.
If the event is interrupted for some reason, you can press D to pause and resume
timing in the upper display. The lower display shows the total elapsed time since the
start of the timing operation. You can calculate the total amount of time that play was
interrupted (lost time or injury time) by subtracting the upper display time from the
lower display time.
EN-17
To set the event time
1. In the Stopwatch Mode, hold down A until the current
event time setting starts to flash in the lower display.
This is the setting screen.
• If the current event time is not displayed, use the
procedure under “To reset elapsed time measurement
to zero” (page EN-18) to display it.
2. While a setting is flashing, use D (+) and B (–) to
change it.
• You can set the event time in the range of 1 minute to
60 minutes, in 1-minute units.
• “- -” indicates there is no event time set.
3. Press A to exit the setting screen.
To start timing at the beginning of an event
When the current time in the lower display reaches the event start time, press D to
start timing.
• This will display elapsed time measurement in the upper and lower displays.
EN-18
To pause timing
1. Press D.
This stops elapsed time measurement in the upper display.
• Elapsed time measurement in the lower display continues.
2. To resume elapsed time measurement in the upper display, press D again.
When the preset event time is reached
• The watch will sound an alarm when the elapsed time measurement in the lower
display (total elapsed time since timing started) reaches the preset event time.
• Elapsed time measurement continues to be performed even after the preset event
time is reached.
To reset elapsed time measurement to zero
1. Press D. This stops elapsed time measurement in the upper display.
• Elapsed time measurement in the lower display continues.
2. Hold down A until the initial Stopwatch Mode screen appears.
EN-19
Preset Timer
The watch includes a number of different preset times that
you can select for the countdown start time.
An alarm sounds when the countdown reaches zero.
• The following are the preset start times, all in minutes:
10, 12, 15, 20, 25, 30, 35, 40, 45.
• You can also select auto-repeat, which automatically
restarts from the preset start time you selected,
whenever zero is reached.
• All of the operations in this section are performed in the
Preset Timer Mode, which you enter by pressing C
(page EN-7).
Preset timer time
Timekeeping Mode time
EN-20
To perform a preset timer operation
1. In the Preset Timer Mode, use A to scroll through the
preset times until the one you want to use is displayed.
10 minutes 12 minutes 15 minutes 20 minutes
A A A
A
A
25 minutes
45 minutes 40 minutes 35 minutes 30 minutes
A A A
A
EN-21
• To turn on auto-repeat, hold down A while a start
time selection screen is displayed. The number of
repeats will appear in the lower display.
• Frequent use of auto-repeat and the alarm can run
down battery power.
2. Press D to start the countdown timer.
• Press D while a countdown operation is in progress
to pause it. Press D again to resume the countdown.
Number of repeats
Auto-repeat on indicator
EN-22
• When the end of the countdown is reached, the alarm sounds for 10 seconds or
until you stop it by pressing any button.
• When the end of the countdown is reached while auto-repeat is turned off, the
watch will go into an elapsed time operation and display how much time has
elapsed since the end of the countdown was reached. The elapsed time operation
will stop automatically when it reaches 60 minutes. At that time the countdown
timer start time selection screen will appear.
• When the end of the countdown is reached while auto-repeat is turned on, a new
countdown starts from the selected preset start time. The number of repeats is
displayed in the lower display. The number of repeats display changes to “- -”
when the count reaches 100.
• To stop a countdown operation completely, first pause it (by pressing D), and then
press A. This will display the initial Preset Timer Mode screen.
EN-23
Countdown Timer
With the countdown timer, you can set up to nine start
times, which are counted down in sequence one after
the other.
The countdown timer can be used for interval training (for
example, three minutes running with INT 1, 1 minute rest
with INT 2, five minutes running with INT 3) or for timing
an multi-period event (for example, 45 minutes of play
with INT 1, 15 minutes rest with INT 2, 45 minutes play
with INT 3).
• The watch performs an alert operation (beeper) when any
timer reaches zero.
• An alert operation (about one second) is performed
when any countdown timer (except for the last one in the
series) reaches zero. When the last countdown timer in
the series reaches zero, an alert operation is performed
for about five seconds.
Start time
(Minutes Seconds)
Countdown timer
number
Timekeeping Mode time
EN-24
• You can turn on an auto-repeat feature that restarts the timer sequence from the
beginning when the end of the last timer is reached.
• All of the operations in this section are performed in the Countdown Timer Mode,
which you enter by pressing C (page EN-8).
To configure countdown timer settings
1. In the Countdown Timer Mode, hold down A until the
countdown timer number starts to flash.
This is the setting screen.
EN-25
2. Use D (+) and B (–) to scroll through the countdown timer numbers until the one
you want to set is displayed.
INT 1
D
INT 2
D
INT 3
D
INT 4
D
INT 5
B B B B
INT 9
B
INT 8
B
INT 7
B
INT 6
D D D
D
B
BD
EN-26
3. Press C to move the flashing in the sequence shown below to select other
settings.
Countdown timer numbers Minutes Seconds Auto-repeat
C C C
C
EN-27
4. While a setting is flashing, use D and B to change it as described below.
Screen To do this: Do this:
Change the countdown timer number
Use D (+) and B (–).
Change the minutes (00-59)
Change the seconds (00-55, 5-second units)
Toggle auto-repeat on ( ) and off ( )
Press D.
• Any timer whose start time is 00' 00" will not be used during the countdown
timer operation.
• There is no auto-repeat for individual countdown timers. In the Countdown Timer
Mode, auto-repeat repeats the entire set of timers.
EN-28
5. Set the times of all of the timers that you want.
6. Press A to exit the setting screen.
• When auto-repeat is turned on, the number of repeats
will appear in the lower display.
• Frequent use of auto-repeat and the alarm can run down
battery power.
To perform a countdown timer operation
In the Countdown Timer Mode, press D to start the countdown of the lowest
numbered countdown timer that has a start time setting that is not zero.
• To pause the countdown timer that is currently counting down, press D. Press D
again to resume the countdown.
• During a countdown timer operation, any countdown timer whose start time is zero
(00' 00") is skipped.
Number of repeats
Auto-repeat on indicator
EN-29
• The first countdown timer of the series is the lowest numbered one with a start time
that is not zero. The final countdown timer of the series is the highest numbered
one with a start time that is not zero.
• While auto-repeat is turned off, the watch beeps when each countdown timer
reaches zero. An alarm will sound for about five seconds when the final countdown
timer reaches zero.
• While auto-repeat is turned on, the watch beeps once when each countdown timer
reaches zero. A five-second alert operation is performed when the final countdown
timer reaches zero, unless the start time of the final countdown timer is 10 seconds
or less. In such a case, the alert operation for the final countdown timer is only one
second long.
• Timing restarts from the first timer when the final countdown timer reaches zero.
The number of repeats is displayed in the lower display. The number of repeats
display changes to “- -” when the count reaches 100.
• An ongoing countdown timer operation continues to be performed even if you exit
the Countdown Timer Mode.
• To stop a countdown timer operation, first press D to pause the countdown of the
current timer, and then press A. This will display Countdown Timer 1 (INT 1).
EN-30
World Time
World Time shows the current time in 48 cities (29 time
zones) around the world.
• When you enter the World Time Mode, the data you were
viewing when you last exited the mode appears first.
• All of the operations in this section are performed in
the World Time Mode, which you enter by pressing C
(page EN-8).
To view the time for another city code
In the World Time Mode, press D to scroll eastward
through city codes.
• For full information about city codes, see the “City Code
Table” at the back of this manual.
• If the current time for a city is wrong, check your
Timekeeping Mode time and Home city code settings
and make necessary changes.
Current time in the zone of
the selected city code
City code
Timekeeping Mode time
EN-31
To toggle a city code time between Standard Time and Daylight Saving Time
1. In the World Time Mode, use D to display the city code
(time zone) whose Standard Time/Daylight Saving Time
setting you want to change.
2. Hold down A for about one second to toggle between
Daylight Saving Time (DST displayed) and Standard
Time (DST 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.
DST indicator
EN-32
Alarm
When the Daily Alarm is turned on, the alarm sounds
for 10 seconds at the preset time each day. When the
Hourly Time Signal is turned on, the watch beeps every
hour on the hour.
• All of the operations in this section are performed
in the Alarm Mode, which you enter by pressing C
(page EN-8).
To set the alarm time
1. Hold down A while in the Alarm Mode until the hour
digits start to flash on the display. The hour digits flash
because they are selected.
• This operation automatically turns on the alarm.
Alarm on indicator
Timekeeping Mode
time
Alarm time (Hour : Minute)
Hourly time signal on
indicator
EN-33
2. Press C to change the selection in the following sequence.
Hour Minute
C
3. While a setting is flashing, use D and B to change it as described below.
Screen To do this: Do this:
Change the hour and minute
Use D (+) and B (–).
• With the 12-hour format, set the time
correctly as a.m. or p.m. (P indicator).
4. After you set the alarm time, press A to return to the Alarm Mode.
To stop the alarm tone after it starts to sound
Press any button.
EN-34
To switch the Daily Alarm and Hourly Time Signal on and off
Press D while in the Alarm Mode to change the status of the Daily Alarm and Hourly
Time Signal in the following sequence.
D D D
D
Both on Both off Daily Alarm only Hourly Time
Signal only
To test the alarm
Hold down D while in the Alarm Mode to sound the alarm.
EN-36
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Graphic Areas
The following describes the information indicated by the three graphic areas in each
mode.
Graphic area A
Graphic area C
Graphic area B
EN-37
Mode Graphic Area A Graphic Area B Graphic Area C
Timekeeping
Timekeeping Mode
minutes
Timekeeping Mode
seconds
Timekeeping Mode
10-seconds
Stopwatch
Stopwatch Time
minutes
Stopwatch Time
1/20-second
Stopwatch Time
10-seconds
Preset Timer Preset Time minutes
Preset Time
1/20-second
Preset Time
10-seconds
Countdown Timer
Countdown Time
minutes
Countdown Time
1/20-second
Countdown Time
10-seconds
World Time
World Time Mode
minutes
World Time Mode
seconds
World Time Mode
10-seconds
Alarm No indication No indication No indication
EN-38
Button Operation Tone
The button operation tone sounds any time you press one
of the watch’s buttons. You can turn the button operation
tone on or off as desired.
• Even if you turn off the button operation tone, the alarm,
the Hourly Time Signal, the countdown timer alarm, and
the event time alarm all operate normally.
To turn the button operation tone on and off
In any mode (except when a setting screen is on the
display), hold down C to toggle the button operation tone
on (
not displayed) and off ( displayed).
• Holding down C to turn the button operation tone on or off also causes the
watch’s current mode to change.
•
is displayed in all modes when the button operation tone is turned off.
Mute indicator
EN-39
Scrolling
The B and D buttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a
scroll operation scrolls at high speed. This is true except when the countdown timer
number is flashing on the Countdown Timer Mode screen (page EN-24).
Auto Return Features
• If you leave the watch in the Alarm Mode for two or three minutes without
performing any operation, it changes to the Timekeeping Mode automatically.
• If you leave a screen with flashing digits on the display for two or three minutes
without performing any operation, the watch exits the setting screen automatically.
Timekeeping
• Resetting the seconds to 00 while the current count is in the range of 30 to 59
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to 00 without changing the minutes.
• The year can be set in the range of 2000 to 2099.
EN-40
• The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to
change it except after you have the watch’s battery replaced.
World Time
• The seconds count of the World Time is synchronized with the seconds count of
the Timekeeping Mode.
• All World Time Mode times are calculated from the current Home City time in the
Timekeeping Mode using UTC time differential values.
• The UTC differential is a value that indicates the time difference between a
reference point in Greenwich, England and the time zone where a city is located.
• The letters “UTC” is the abbreviation for “Universal Time Coordinated”, which is the
world-wide scientific standard of timekeeping. It is based upon carefully maintained
atomic (cesium) clocks that keep time accurately to within microseconds. Leap
seconds are added or subtracted as necessary to keep UTC in sync with the
Earth’s rotation.
EN-41
Illumination Precautions
• Illumination loses power after very long use.
• Illumination may be hard to see when viewed under direct sunlight.
• Illumination turns off automatically whenever an alarm sounds.
• Frequent use of illumination runs down the battery.
EN-42
Specifications
Accuracy at normal temperature: ±30 seconds a month
Timekeeping: Hour, minute, second, p.m. (P), month, day, day of the week
Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: Home City code (can be assigned one of 48 city codes); Daylight Saving
Time (summer time)/Standard Time
Stopwatch
Measuring units: Upper display: 1 second; Lower display: 1 second
Measuring capacities: Upper display: 59'59"; Lower display: 99'59.99"
Measuring modes: Elapsed time, event time
Preset Timer
Measuring unit: 1 second
Preset Start Times: 10, 12, 15, 20, 25, 30, 35, 40, 45 minutes
Timer modes: Elapsed time, Auto-repeat
Measurement of elapsed time for up to 60 minutes after the countdown reaches
zero
EN-43
Countdown Timer
Number of Timers: Up to 9
Measuring unit: 1 second
Input range: 59'55" (1-minute increments and 5-second increments)
Other: Auto-repeat timing
World Time: 48 cities (29 time zones)
Other: Daylight Saving Time/Standard Time
Alarm: Daily alarm, Hourly time signal
Illumination: LED (light-emitting diode)
Other: Button operation tone on/off
EN-44
Battery: One lithium battery (Type: CR2025)
Approximately 10 years on type CR2025 (1 stopwatch elapsed time operation
per week (10-second alarm when timing reaches preset event time); 1 preset
timer operation per week (10-second alarm when countdown reaches zero); 1
countdown timer operation per week (8 1-second beeps when any countdown
timer reaches zero, 5-second alarm when last countdown timer reaches zero), daily
alarm operation 10 seconds per day, 1.5 seconds of illumination per day)
Specifications are subject to change without notice.
EN-45
Operating Precautions
Water Resistance
• The information below applies to watches with WATER RESIST or WATER
RESISTANT marked on the back cover.
Water
Resistance
Under Daily
Use
Enhanced Water Resistance Under
Daily Use
5
Atmospheres
10
Atmospheres
20
Atmospheres
Marking
On watch front or on
back cover
No
BAR mark
5BAR 10BAR 20BAR
Example of
Daily Use
Hand washing, rain Yes Yes Yes Yes
Water-related work, swimming
No Yes Yes Yes
Windsurfing No No Yes Yes
Skin diving No No Yes Yes
•
Do not use your watch for scuba diving or other types of diving that requires air tanks.
OPUM-H
EN-46
• Watches that do not have WATER RESIST or WATER RESISTANT marked on
the back cover are not protected against the effects of sweat. Avoid using such
a watch under conditions where it will be exposed to large amounts of sweat or
moisture, or to direct splashing with water.
• Even if a watch is water resistant, note the usage precautions described below.
Such types of use reduce water resistance performance and can cause fogging of
the glass.
− Do not operate the crown or buttons while your watch is submersed in water or
wet.
− Avoid wearing your watch while in the bath.
− Do not wear your watch while in a heated swimming pool, sauna, or any other
high temperature/high humidity environment.
− Do not wear your watch while washing your hands or face, while doing
housework, or while performing any other task that involves soaps or detergents.
• After submersion in seawater, use plain water to rinse all salt and dirt from your
watch.
• To maintain water resistance, have the gaskets of your watch replaced periodically
(about once every two or three years).
EN-47
• A trained technician will inspect your watch for proper water resistance whenever
you have its battery replaced. Battery replacement requires the use of special tools.
Always request battery replacement from your original retailer or from an authorized
CASIO service center.
• Some water-resistant watches come with fashionable leather bands. Avoid
swimming, washing, or any other activity that causes direct exposure of a leather
band to water.
• The inside surface of the watch glass may fog when the watch is exposed to a
sudden drop in temperature. No problem is indicated if the fogging clears up
relatively quickly. Sudden and extreme temperature changes (such as coming into
an air conditioned room in the summer and standing close to an air conditioner
outlet, or leaving a heated room in the winter and allowing your watch to come into
contact with snow) can cause it to take longer for glass fogging to clear up. If glass
fogging does not clear up or if you notice moisture inside of the glass, immediately
stop using your watch and take it to your original retailer or to an authorized CASIO
service center.
• Your water-resistant watch has been tested in accordance with International
Organization for Standardization regulations.
EN-48
Band
• Tightening the band too tightly can cause you to sweat and make it difficult for air
to pass under the band, which can lead to skin irritation. Do not fasten the band too
tightly. There should be enough room between the band and your wrist so you can
insert your finger.
• Deterioration, rust, and other conditions can cause the band to break or come off
of your watch, which in turn can cause band pins to fly out of position or to fall out.
This creates the risk of your watch falling from your wrist and becoming lost, and
also creates the risk of personal injury. Always take good care of your band and
keep it clean.
• Immediately stop using a band if you even notice any of the following: loss of band
flexibility, band cracks, band discoloration, band looseness, band connecting
pin flying or falling out, or any other abnormality. Take your watch to your original
retailer or to a CASIO service center for inspection and repair (for which you will be
charged) or to have the band replaced (for which you will be charged).
EN-49
Temperature
• Never leave your watch on the dashboard of a car, near a heater, or in any other
location that is subject to very high temperatures. Do not leave your watch where
it will be exposed to very low temperatures. Temperature extremes can cause your
watch to lose or gain time, to stop, or otherwise malfunction.
• Leaving your watch in an area hotter than +60°C (140°F) for long periods can lead
to problems with its LCD. The LCD may become difficult to read at temperatures
lower than 0°C (32°F) and greater than +40°C (104°F).
Impact
• Your watch is designed to withstand impact incurred during normal daily use and
during light activity such as playing catch, tennis, etc. Dropping your watch or
otherwise subjecting it to strong impact, however, can lead to malfunction. Note
that watches with shock-resistant designs (G-SHOCK, BABY-G, G-MS) can be
worn while operating a chain saw or engaging in other activities that generate
strong vibration, or while engaging in strenuous sports activities (motocross, etc.)
EN-50
Magnetism
• Though a digital watch normally is not affected by magnetism, very strong
magnetism (from medical equipment, etc.) should be avoided because it can cause
malfunction and damage to electronic components.
Electrostatic Charge
• Exposure to very strong electrostatic charge can cause your watch to display
the wrong time. Very strong electrostatic charge even can damage electronic
components.
• Electrostatic charge can cause the display to go blank momentarily or cause a
rainbow effect on the display.
Chemicals
• Do not allow your watch to come into contact with thinner, gasoline, solvents,
oils, or fats, or with any cleaners, adhesives, paints, medicines, or cosmetics that
contain such ingredients. Doing so can cause discoloration of or damage to the
resin case, resin band, leather, and other parts.
EN-51
Storage
• If you do not plan to use your watch for a long time, thoroughly wipe it free of all
dirt, sweat, and moisture, and store it in a cool, dry place.
Resin Components
• Allowing your watch to remain in contact with other items or storing it together with
other items for long periods while it is wet can cause color on resin components
to transfer to the other items, or the color of the other items to transfer to the resin
components of your watch. Be sure to dry off your watch thoroughly before storing
it and make sure it is not in contact with other items.
• Leaving your watch where it is exposed to direct sunlight (ultraviolet rays) for long
periods or failure to clean dirt from your watch for long periods can cause it to
become discolored.
• Friction caused by certain conditions (strong external force, sustained rubbing,
impact, etc.) can cause discoloration of painted components.
• If there are printed figures on the band, strong rubbing of the printed area can
cause discoloration.
EN-52
• Leaving your watch wet for long periods can cause fluorescent color to fade. Wipe
the watch dry as soon as possible after it becomes wet.
• Semi-transparent resin parts can become discolored due to sweat and dirt, and if
exposed to high temperatures and humidity for long periods.
• Daily use and long-term storage of your watch can lead to deterioration, breaking,
or bending of resin components. The extent of such damage depends on usage
conditions and storage conditions.
Leather Band
• Allowing your watch to remain in contact with other items or storing it together with
other items for long periods while it is wet can cause the color of the leather band
to transfer to the other items or the color of the other items to transfer to the leather
band. Be sure to dry off your watch thoroughly with a soft cloth before storing it
and make sure it is not in contact with other items.
EN-53
• Leaving a leather band where it is exposed to direct sunlight (ultraviolet rays) for
long periods or failure to clean dirt from a leather band for long periods can cause
it to become discolored.
CAUTION: Exposing a leather band to rubbing or dirt can cause color transfer and
discoloration.
Metal Components
• Failure to clean dirt from metal components can lead to formation of rust, even if
components are stainless steel or plated. If metal components exposed to sweat or
water, wipe thoroughly with a soft, absorbent cloth and then place the watch in a
well-ventilated location to dry.
• Use a soft toothbrush or similar tool to scrub the metal with a weak solution of
water and a mild neutral detergent, or with soapy water. Next, rinse with water
to remove all remaining detergent and then wipe dry with a soft absorbent cloth.
When washing metal components, wrap the watch case with kitchen plastic wrap
so it does not come into contact with the detergent or soap.
EN-54
Bacteria and Odor Resistant Band
• The bacteria and odor resistant band protects against odor generated by the
formation of bacteria from sweat, which ensures comfort and hygiene. In order
to ensure maximum bacteria and odor resistance, keep the band clean. Use an
absorbent soft cloth to thoroughly wipe the band clean of dirt, sweat, and moisture.
A bacteria and odor resistant band suppresses the formation of organisms and
bacteria. It does not protect against rash due to allergic reaction, etc.
Liquid Crystal Display
• Display figures may be difficult to read when viewed from an angle.
Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any damage
or loss suffered by you or any third party arising through the use of your watch or
its malfunction.
EN-55
User Maintenance
Caring for Your Watch
Remember that you wear your watch next to your skin, just like a piece of clothing.
To ensure your watch performs at the level for which it is designed, keep it clean by
frequently wiping with a soft cloth to keep your watch and band free of dirt, sweat,
water and other foreign matter.
• Whenever your watch is exposed to sea water or mud, rinse it off with clean fresh
water.
• For a metal band or a resin band with metal parts, use a soft toothbrush or similar
tool to scrub the band with a weak solution of water and a mild neutral detergent,
or with soapy water. Next, rinse with water to remove all remaining detergent and
then wipe dry with a soft absorbent cloth. When washing the band, wrap the watch
case with kitchen plastic wrap so it does not come into contact with the detergent
or soap.
EN-56
• For a resin band, wash with water and then wipe dry with a soft cloth. Note that
sometimes a smudge like pattern may appear on the surface of a resin band. This
will not have any effect on your skin or clothing. Wipe with a cloth to remove the
smudge pattern.
• Clean water and sweat from a leather band by wiping with a soft cloth.
• Not operating a watch crown, buttons, or rotary bezel could lead to later problems
with their operation. Periodically rotate the crown and rotary bezel, and press
buttons to maintain proper operation.
Dangers of Poor Watch Care
Rust
• Though the metal steel used for your watch is highly rust-resistant, rust can form if
your watch is not cleaned after it becomes dirty.
− Dirt on your watch can make it impossible for oxygen to come into contact with
the metal, which can lead to breakdown of the oxidization layer on the metal
surface and the formation of rust.
EN-57
• Rust can cause sharp areas on metal components and can cause band pins to fly
out of position or to fall out. If you ever notice any abnormality immediately stop
using your watch and take it to your original retailer or to an authorized CASIO
service center.
• Even if the surface of the metal appears clean, sweat and rust in crevasses can
soil the sleeves of clothing, cause skin irritation, and even interfere with watch
performance.
Premature Wear
• Leaving sweat or water on a resin band or bezel, or storing your watch an area
subject to high moisture can lead to premature wear, cuts, and breaks.
Skin Irritation
• Individuals with sensitive skin or in poor physical condition may experience skin
irritation when wearing a watch. Such individuals should keep their leather band
or resin band particularly clean. Should you ever experience a rash or other skin
irritation, immediately remove your watch and contact a skin care professional.
EN-58
Battery Replacement
• Leave battery replacement up to your original retailer or authorized CASIO service
center.
• Have the battery replaced only with the type specified in the User’s Guide. Use of a
different battery type can cause malfunction.
• When replacing the battery, also request a check for proper water resistance.
• Ornamental resin components may become worn, cracked, or bent over
time when subjected to normal daily use. Note that if cracking or any other
abnormality indicating possible damage is noticed in a watch submitted for battery
replacement, your watch will be returned with an explanation of the abnormality,
without the requested servicing being performed.
EN-59
Initial Battery
• The battery that comes loaded in your watch when you purchase it is used for
function and performance testing at the factory.
• The test battery may go dead quicker than the normally rated battery life as noted
in the User’s Guide. Note that you will be charged for replacement of this battery,
even if replacement is required within your watch’s warranty period.
Low Battery Power
• Low battery power is indicated by large timekeeping error, by dim display contents,
or by a blank display.
• Operation while battery power is low can result in malfunction. Replace the battery
as soon as possible.
L-1
City Code Table
L-2
City Code Table
City
Code
City
UTC
Differential
Other major cities in same time zone
PPG Pago Pago –11
HNL Honolulu –10 Papeete
ANC Anchorage –9 Nome
YVR Vancouver –8 Las Vegas, Seattle/Tacoma, Dawson City
SFO San Francisco
LAX Los Angeles
DEN Denver –7 El Paso, Edmonton
MEX Mexico City –6 Winnipeg, Houston, Dallas/Fort Worth, New Orleans
CHI Chicago
MIA Miami –5 Montreal, Detroit, Boston, Panama City, Havana,
Lima, Bogota
NYC New York
CCS Caracas –4 La Paz, Santiago, Port Of Spain
YYT St. Johns –3.5
RIO Rio De Janeiro –3 Sao Paulo, Buenos Aires, Brasilia, Montevideo
RAI Praia –1
L-3
City
Code
City
UTC
Differential
Other major cities in same time zone
LIS Lisbon 0 Dublin, Casablanca, Dakar, Abidjan
LON London
BCN Barcelona +1 Amsterdam, Algiers, Hamburg, Frankfurt, Vienna,
Stockholm, Madrid
PAR Paris
MIL Milan
ROM Rome
BER Berlin
ATH Athens +2 Helsinki, Beirut, Damascus, Cape Town
JNB Johannesburg
IST Istanbul
CAI Cairo
JRS Jerusalem
MOW
Moscow +3 Kuwait, Riyadh, Aden, Addis Ababa, Nairobi
JED Jeddah
THR Tehran +3.5 Shiraz
L-4
City
Code
City
UTC
Differential
Other major cities in same time zone
DXB Dubai +4 Abu Dhabi, Muscat
KBL Kabul +4.5
KHI Karachi +5
MLE Male
DEL Delhi +5.5 Mumbai, Kolkata
DAC Dhaka +6 Colombo
RGN Yangon +6.5
BKK Bangkok +7 Jakarta, Phnom Penh, Hanoi, Vientiane
SIN Singapore +8 Kuala Lumpur, Taipei, Manila, Perth, Ulaanbaatar
HKG Hong Kong
BJS Beijing
SEL Seoul +9 Pyongyang
TYO Tokyo
ADL Adelaide +9.5 Darwin
L-5
City
Code
City
UTC
Differential
Other major cities in same time zone
GUM Guam +10 Melbourne, Rabaul
SYD Sydney
NOU Noumea +11 Port Vila
WLG Wellington +12 Christchurch, Nadi, Nauru Island
• Based on data as of June 2005.
• This table shows the city codes of this watch.
• The rules governing global times (UTC offset and GMT differential) and summer
time are determined by each individual country.
CASIO COMPUTER CO., LTD.
6-2, Hon-machi 1-chome
Shibuya-ku, Tokyo 151-8543, Japan
