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Operation Guide 2910
1
MO0410-EA
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully and keep it on hand for later reference
when necessary.
Keep the watch exposed to bright light
The electricity generated by the solar cell of the watch is
stored by a built-in battery. Leaving or using the watch
where it is not exposed to light causes the battery to run
down. Make sure the watch is exposed to light as much as
possible.
· When you are not wearing the watch on your wrist,
position the face so it is pointed at a source of bright
light.
· You should try to keep the watch outside of your sleeve
as much as possible. Charging is significantly reduced if
the face is only partially covered.
ll
l
l
l
l
l
l
l
l
l
Bright Light
Solar cell
· The watch continues to operate, even when it is not exposed to light. Leaving the
watch in the dark can cause the battery to run down, which will cause some watch
functions to be disabled. If the battery goes dead, you will have to re-configure watch
settings after recharging. To ensure normal watch operation, be sure to keep it
exposed to light as much as possible.
Bright Light
Electrical
energy
All
functions
enabled
LEVEL 1
LEVEL 2
LEVEL 3
Charge
Solar cell
(Converts light to
electrical power.)
Rechargeable battery
LEVEL 1
LEVEL 2
LEVEL 3
Some
functions
disabled
Dis-
charge
Battery charges in the light.
Battery discharges in the dark.
· The actual level at which some functions are disabled depends on the watch model.
· Frequent display illumination can quickly run down the battery and require charging.
The following guidelines give an idea of the charging time required to recover from a
single illumination operation.
Approximately 5 minutes exposure to bright sunlight coming in through a window
Approximately 50 minutes exposure to indoor fluorescent lighting
· Be sure to read "Power Supply" for important information you need to know
when exposing the watch to bright light.
About This Manual
· 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.
· 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.
(Light)
(Light)
If the display of the watch is blank...
If the display of the watch is blank, it means that the watch's Power Saving function
has turned off the display to conserve power.
· See "Power Saving Function" for more information.
L
L
Alarm Mode
Countdown Timer Mode
Stopwatch Mode
General Guide
· Press C to change from mode to mode.
· In any mode, press L to illuminate the display.
Timekeeping Mode
Press C.
L
World Time Mode
L
L
Timekeeping
Use the Timekeeping Mode to set and view the current time and date.
· When setting the time, you can also configure settings for the illumination duration,
the 12/24-hour format, and power saving on/off.
· In the Timekeeping Mode, you can press B to change the display format as shown
below.
Hour : Minutes Seconds
PM indicator
Month ­ Day
L
Press B.
Day of week
L
Setting the Time and Date
Make sure you select your Home City code before you change the current time and
date settings. World Time Mode times are all displayed in accordance with the
Timekeeping Mode settings. Because of this, World Time Mode times will not be
correct if you do not select the proper Home City code before setting the time and
date in the Timekeeping Mode.
To set the time and date
1. In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2. Press C to change the flashing contents in the
sequence shown below to select other settings.
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||
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City code
Seconds
Hour
Minutes
12/24-Hour
Format
Month
Year
DST
Day
Power
Saving
City Code
Screen:
To do this:
Change the city code
Toggle between Daylight Saving Time
(ON) and Standard Time (OF)
Toggle between 12-hour (
12H) and
24-hour (
24H) timekeeping
Do this:
Use D (east) and B (west).
Press D.
Press D.
3. When the setting you want to change is flashing, use B and/or D to change it as
described below.
Reset the seconds to
00
Toggle the illumination duration setting
between 1.5 seconds ( ) and 2.5
seconds ( )
Change the hour, minutes, or year
Change the month or day
Toggle Power Saving on (ON) and off
(OF)
Press D.
Press B.
Use D (+) and B (­).
Press D.
· See "City Code Table" for a complete list of available city codes.
· For information about settings other than the time and date, see the following.
Illumination duration: Illumination
Power Saving: Power Saving Function
4. Press A to exit the setting screen.
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 change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down A until the city code starts to flash, which
indicates the setting screen.
2. Press C once to display the DST setting screen.
3. Use D to toggle Daylight Saving Time (ON) and Standard Time (OF).
4. Press A to exit the setting screen.
· The DST indicator appears to indicate that Daylight Saving Time is turned on.


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Operation Guide 2910
2
World Time
The World Time Mode shows you the current time in 30
cities (29 time zones) around the world.
· If the current time shown for a city is wrong, check your
Home City time settings and make the necessary
changes.
· All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C.
City code
Current time in
selected city
To view the time in another city
While in the World Time Mode, press D to scroll through the city codes (time zones)
to the east or B to scroll to the west.
· For full information on city codes, see the "City Code Table".
To toggle a city code time between Standard Time and Daylight Saving Time
1. In the World Time Mode, use B and D to display the
city code (time zone) whose Standard Time/Daylight
Saving Time setting you want to change.
2. Hold down A to toggle Daylight Saving Time (DST
indicator displayed) and Standard Time (DST indicator
not displayed).
· Note that you cannot switch between Standard Time
and Daylight Saving Time while GMT is selected as the
city code.
· The DST indicator will appear 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
Alarms
The Alarm Mode gives you a choice of four one-time
alarms and one snooze alarm.
Also use the Alarm Mode to turn the Hourly Time Signal
(SIG) on and off.
· There are five alarms numbered AL1 through AL4,
and SNZ. You can configure SNZ as a snooze alarm
only. Alarms AL1 through AL4 can be used as one-
time alarms only.
· All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
Alarm time
(Hour : Minutes)
Alarm number
To set an alarm time
1. In the Alarm Mode, use D to scroll through the alarm
screens until the one whose time you want to set is
displayed.
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. Use C to move the flashing between the hour and
minute settings.
AL1
AL2
AL3
SIG
SNZ
AL4
4. While a setting is flashing, use D (+) and B (­) to change it.
5. Press A to exit the setting screen.
· 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).
Alarm Operation
The alarm tone sounds at the preset time for 10 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.
· Pressing any button stops the alarm tone operation.
· 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 snooze alarm setting screen
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
To turn an alarm on and off
1. In the Alarm Mode, use D to select an alarm.
2. Press B to toggle it on and off.
· Turning on a one-time alarm (AL1, AL2, AL3,
AL4) displays the alarm on indicator on its Alarm
Mode screen. Turning on the snooze alarm (
SNZ)
displays the alarm on indicator and snooze alarm
indicator on its Alarm Mode screen.
· In all modes, the alarm on indicator is shown for any
alarm that is currently turned on. When the snooze
alarm is on, the snooze alarm indicator is displayed in all
modes.
· The alarm on indicator flashes while the alarm is
sounding.
· The snooze alarm indicator flashes during the 5-minute
intervals between alarms.
Snooze alarm indicator
Alarm on indicator
To turn the Hourly Time Signal on and off
1. In the Alarm Mode, use D to select the Hourly Time
Signal (SIG).
2. Press B to toggle it on (Hourly Time Signal on
indicator displayed) and off (Hourly Time Signal on
indicator not displayed).
· The Hourly Time Signal on indicator is displayed in all
modes when the Hourly Time Signal is turned on.
Hourly time signal
on indicator
Countdown Timer
You can set the countdown timer within a range of one to
60 minutes. An alarm sounds when the countdown
reaches zero.
· All of the operations in this section are performed in the
Countdown Timer Mode, which you enter by pressing
C.
Minutes
1/10 second
Seconds
To set the countdown start time
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. While a setting is flashing, use D (+) and B (­) to change it.
3. Press A to exit the setting screen.
To use the countdown timer
Press D while in the Countdown Timer Mode to start the countdown timer.
· When the end of the countdown is reached, the alarm sounds for 10 seconds or until
you stop it by pressing any button. The countdown time is automatically reset to its
starting value after the alarm stops.
· 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 B. This returns the countdown time to its starting value.
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
· The display range of the stopwatch is 23 hours, 59
minutes, 59.99 seconds.
· The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
· Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
· 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.
Minutes
Seconds
Hours 1/100
second
D
Start
Stop
Elapsed Time
Re-start
Clear
D
Stop
D
D
B
Split Time
D
Start
Split
(SPL displayed)
Split release
Clear
B
Stop
B
D
B
Two Finishes
D
Start
Split
Stop
Clear
B
Split release
D
B
B
First runner
finishes.
Display time of
first runner.
Second runner
finishes.
Display time of
second runner.
To measure times with the stopwatch
Illumination
The watch has an EL (electro-luminescent) panel that
causes the entire display to glow for easy reading in the
dark. The watch's auto light switch automatically
illuminates the display when you angle the watch towards
your face.
· The auto light switch must be turned on (indicated by
the auto light switch indicator) for it to operate.
· See "Illumination Precautions" for other important
information.
To turn on illumination manually
In any mode, press L to illuminate the display.
· You can specify 1.5 seconds or 2.5 seconds as the
illumination duration. See "To set the time and date" for
more information.
· The above operation turns on illumination regardless of
the current auto light switch setting.
Auto light switch
indicator
About the Auto Light Switch
Turning on the auto light switch causes illumination to turn on whenever you position
your wrist as described below in any mode. Note that this watch features a "Full Auto
EL Light," so the auto light switch operates only when available light is below a certain
level. It does not illuminate the display under bright light.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you at more than 40 degrees causes illumination to turn on.
· Wear the watch on the outside of your wrist.
Parallel to
ground
More than
40
°


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Operation Guide 2910
3
Warning!
· Always make sure you are in a safe place whenever you are reading the watch
using the auto light switch. Be especially careful when running or engaged in
any other activity that can result in accident or injury. Also take care that
sudden illumination by the auto light switch does not startle or distract others
around you.
· When you are wearing the watch, make sure that its auto light switch is turned
off before riding on a bicycle, or operating a motorcycle or any other motor
vehicle. Sudden and unintended operation of the auto light switch can create a
distraction, which can result in a traffic accident and serious personal injury.
To turn the auto light switch on and off
In any mode, hold down L for about two seconds to toggle the auto light switch on
(auto light switch indicator displayed) and off (auto light switch indicator not displayed).
· The auto light switch indicator remains in all modes while the auto light switch is
turned on.
Power Supply
This watch is equipped with a solar cell and a special rechargeable battery (secondary
battery) that is charged by the electrical power produced by the solar cell. The
illustration shown below shows how you should position the watch for charging.
Example: Orient the watch so its face
is pointing at a light source.
· The illustration shows how to position
a watch with a resin band.
· Note that charging efficiency drops
when any part of the solar cell is
blocked by clothing, etc.
· You should try to keep the watch
outside of your sleeve as much as
possible. Charging is significantly
reduced if the face is only partially
covered.
Solar cell
Important!
· Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause rechargeable battery
power to run down. Make sure that the watch is normally exposed to bright light
whenever possible.
· This watch uses a special rechargeable battery to store power produced by the solar
cell, so regular battery replacement is not required. However, after very long use, the
rechargeable battery may lose its ability to achieve a full charge. If you experience
problems getting the special rechargeable battery to fully charge, contact your
dealer or CASIO distributor about having it replaced.
· Never try to remove or replace the watch's special battery yourself. Use of the wrong
type of battery can damage the watch.
· The current time and all other settings return to their initial factory defaults whenever
battery power drops to Level 4 and when you have the battery replaced.
· Turn on the watch's Power Saving function and keep it in an area normally exposed
to bright light when storing it for long periods. This helps to keep the rechargeable
battery from going dead.
Function Status
All functions enabled.
All functions enabled.
Alarm, hourly time signal,
illumination, auto light switch,
and display disabled.
All functions, including
timekeeping, disabled and
initialized.
Battery Power Indicator and Recover Indicator
The battery power indicator shows you the current power level of the rechargeable
battery.
Level
1
2
3
4
Battery Power Indicator
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Battery power indicator
Recover indicator
(Charge Soon Alert)
· The flashing charge indicator (CHG ) at Level 3 tells you that battery power is very
low, and that exposure to bright light for charging is required as soon as possible.
· At Level 4, all functions are disabled and settings return to their initial factory
defaults. Functions are enabled once again after the rechargeable battery is
charged, but you need to set the time and date, after the battery reaches Level 3
(indicated by the flashing charge indicator) from Level 4. You will not be able to
configure any of the other settings until the battery reaches Level 2 (no charge
indicator) after dropping to Level 4.
· Leaving the watch in direct sunlight or some other very strong light source can cause the
battery power indicator to momentarily show a reading that is higher than the actual
battery level. The correct battery power indicator should appear after a few minutes.
· If you use the light or alarms a number of times during a short period, the recover
indicator (RECOV) appears and the following operations become disabled until
battery power recovers.
Illumination
Beeper tone
After some time, battery power will recover and the recover indicator will disappear,
indicating that the above functions are enabled again.
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.
Also note that allowing the watch to become very hot can cause its liquid crystal
display to black out. The appearance of the LCD should become normal again when
the watch returns to a lower temperature.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it
to become quite hot. Take care when handling the watch to avoid burn injury.
The watch can become particularly hot when exposed to the following
conditions for long periods.
· On the dashboard of a car parked in direct sunlight
· Too close to an incandescent lamp
· Under direct sunlight
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Day
(5,000 lux)
Indoor Fluorescent Lighting (500 lux)
Approximate Exposure Time
4 minutes
19 minutes
29 minutes
5 hours
· Since these are the specs, we can include all the technical details.
· Display on 18 hours per day, sleep state 6 hours per day
· 1 illumination operation (1.5 seconds) per day
· 10 seconds of alarm operation per day
· Stable operation is promoted by frequent charging.
Charging Guide
After a full charge, timekeeping remains enabled for up to about 11 months.
· The following table shows the amount of time the watch needs to be exposed to light
each day in order to generate enough power for normal daily operations.
­ ­ ­
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
· The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
6 hours
30 hours
61 hours
Exposure Level
(Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window
(10,000 lux)
Daylight Through a Window
on a Cloudy Day (5,000 lux)
Indoor Fluorescent Lighting
(500 lux)
Approximate Exposure Time
Level 4
Level 3
Level 2
Level 1
L
L
L
2 hours
5 hours
9 hours
101 hours
L
22 hours
109 hours
220 hours
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.
Power Saving Function
When turned on, the Power Saving function automatically
enters a sleep state whenever the watch is left in an area
where it is dark for a certain period. The table below
shows how watch functions are affected by the Power
Saving function.
Power saving
indicator
· Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
· The watch will not enter the sleep state between 6:00 AM and 10:59 PM. If the
watch is already in the sleep state when 6:00 AM arrives, however, it will remain in
the sleep state.
To recover from the sleep state
Perform any one of the following operations.
· Move the watch to a well-lit area.
· Press any button.
· Angle the watch towards your face for reading.
Elapsed Time
in Dark
60 to 70 minutes
6 or 7 days
Display
Blank, with Sleep indicator
(P.SAVE) flashing
Blank, with Sleep indicator
(P.SAVE) not flashing
Operation
All functions enabled, except
for the display
Beeper tone, backlight, and
display are disabled.
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2. Press C nine times until the Power Saving on/off
screen appears.
3. Press D to toggle Power Saving on (ON) and off (OF).
4. Press A to exit the setting screen.
· The Power Saving indicator (P.SAVE) is on the display
in all modes while Power Saving is turned on.
Auto Return Features
· If you leave the watch in the Alarm Mode for two or three minutes without performing
any operation, it automatically returns to the Timekeeping Mode.
· If you leave the watch with a flashing setting on the display for two or three minutes
without performing any operation, the watch automatically exits the setting screen.
On/Off status
Scrolling
The B and D buttons are used in various modes and setting screens to scroll
through data. In most cases, holding down these buttons during a scroll operation
scrolls through the data at high speed.
Initial Screens
When you enter the World Time or Alarm Mode, the data you were viewing when you
last exited the mode appears first.


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Operation Guide 2910
4
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 day of the week is automatically displayed in accordance with the date (year,
month, and day) settings.
· The year can be set in the range of 2000 to 2099.
· 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 or when battery power drops to
Level 4.
· The current time for all city codes in the Timekeeping Mode and World Time Mode is
calculated in accordance with the Greenwich Mean Time (GMT) differential for each
city, based on your Home City time setting.
· GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC*) data.
* UTC 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.
The reference point for UTC is Greenwich, England.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also
applied in all other modes.
· With the 12-hour format, the PM indicator (P) appears on the display 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.
· With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
Illumination Precautions
· The electro-luminescent panel that provides illumination loses power after very long
use.
· Illumination may be hard to see when viewed under direct sunlight.
· The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
· Illumination automatically turns off whenever an alarm sounds.
· Frequent use of illumination runs down the battery.
Auto light switch precautions
· The auto light switch is turned off automatically whenever battery power is at Level
3.
· Wearing the watch on the inside of your wrist, movement of your arm, or vibration of
your arm can cause frequent activation of the auto light switch and illumination of the
display. To avoid running down the battery, turn off the auto light switch whenever
engaging in activities that might cause frequent illumination.
· Note that wearing the watch under your sleeve while the auto light switch is turned
on can cause frequent illumination of the display and can run down the battery.
· Illumination may not turn on if the face of the watch is
more than 15 degrees above or below parallel. Make
sure that the back of your hand is parallel to the ground.
· Illumination turns off after the preset illumination
duration (see "To set the time and date"), even if you
keep the watch pointed towards your face.
· Static electricity or magnetic force can interfere with
proper operation of the auto light switch. If illumination
does not turn on, try moving the watch back to the
starting position (parallel with the ground) and then tilt it
back towards you again. If this does not work, drop your
arm all the way down so it hangs at your side, and then
bring it back up again.
· Under certain conditions, illumination may not turn on until about one second after
you turn the face of the watch towards you. This does not necessarily indicate
malfunction of the auto light switch.
· You may notice a very faint clicking sound coming from the watch when it is shaken
back and forth. This sound is caused by mechanical operation of the auto light
switch, and does not indicate a problem with the watch.
More than 15 degrees
too high
Honolulu
Anchorage
Los Angeles
Denver
Chicago
New York
Caracas
Rio De Janeiro
London
Paris
Berlin
City
City
GMT
Other major cities in same time zone
Code
Differential
City Code Table
­ ­ ­
HNL
ANC
LAX
DEN
CHI
NYC
CCS
RIO
­ ­ ­
­ ­ ­
GMT
LON
PAR
BER
­11.0
­10.0
­09.0
­08.0
­07.0
­06.0
­05.0
­04.0
­03.0
­02.0
­01.0
+00.0
+01.0
Pago Pago
Papeete
Nome
San Francisco, Las Vegas, Vancouver,
Seattle/Tacoma, Dawson City
El Paso, Edmonton
Houston, Dallas/Fort Worth,
New Orleans, Mexico City, Winnipeg
Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
La Paz, Santiago, Port Of Spain
Sao Paulo, Buenos Aires, Brasilia, Montevideo
Praia
Dublin, Lisbon, Casablanca, Dakar, Abidjan
Milan, Rome, Madrid, Amsterdam, Algiers, Hamburg,
Frankfurt, Vienna, Stockholm
Athens
Cairo
Jerusalem
Jeddah
Tehran
Dubai
Kabul
Karachi
Delhi
Dhaka
Yangon
Bangkok
Hong Kong
Seoul
Tokyo
Adelaide
Sydney
Noumea
Wellington
+02.0
+03.0
+03.5
+04.0
+04.5
+05.0
+05.5
+06.0
+06.5
+07.0
+08.0
+09.0
+09.5
+10.0
+11.0
+12.0
Helsinki, Istanbul, Beirut, Damascus,
Cape Town
Kuwait, Riyadh, Aden, Addis Ababa, Nairobi, Moscow
Shiraz
Abu Dhabi, Muscat
Male
Mumbai, Kolkata
Colombo
Jakarta, Phnom Penh, Hanoi, Vientiane
Singapore, Kuala Lumpur, Beijing, Taipei, Manila, Perth,
Ulaanbaatar
Pyongyang
Darwin
Melbourne, Guam, Rabaul
Port Vila
Christchurch, Nadi, Nauru Island
ATH
CAI
JRS
JED
THR
DXB
KBL
KHI
DEL
DAC
RGN
BKK
HKG
SEL
TYO
ADL
SYD
NOU
WLG
· Based on data as of June 2004.