Contents
Precautions
Operating Precautions
User Maintenance
Battery
Before Getting Started...
General Guide
Indicators
Navigating Between Modes
Selecting a Timekeeping Mode Digital Display
Format
Charging
Viewing the Face in the Dark
Time Adjustment
Adjusting the Current Time Setting
World Time
Checking World Time
Setting the World Time City
Alarm
Configuring Alarm Settings
Configuring the Hourly Time Signal Setting
Turning Off an Alarm or the Hourly Time Signal
Stopwatch
Measuring Elapsed Time
Measuring a Split Time
Timing the First and Second Place Finishers
Timer
Setting the Time
Using the Timer
Other Settings
Enabling the Button Operation Tone
Configuring Power Saving Function Settings
Other Information
City Table
Specifications
Troubleshooting
Watch Operation Guide 3545
1
MA2403-EA
OPUM-I
© 2024 CASIO COMPUTER CO., LTD.
Precautions
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
Marking on watch front or on
back cover
No BAR
mark
Example of Daily Use
Hand washing, rain Yes
Water-related work, swimming No
Windsurfing No
Skin diving No
Enhanced Water Resistance Under Daily
Use
5 Atmospheres
Marking on watch front or on
back cover
5BAR
Example of Daily Use
Hand washing, rain Yes
Water-related work, swimming Yes
Windsurfing No
Skin diving No
10 Atmospheres
Marking on watch front or on
back cover
10BAR
Example of Daily Use
Hand washing, rain Yes
Water-related work, swimming Yes
Windsurfing Yes
Skin diving Yes
20 Atmospheres
Marking on watch front or on
back cover
20BAR
Example of Daily Use
Hand washing, rain Yes
Water-related work, swimming Yes
Windsurfing Yes
Skin diving Yes
●
Do not use your watch for scuba diving or
other types of diving that requires air tanks.
●
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.
ー
Do not operate the crown or buttons while
your watch is submersed in water or wet.
ー
Avoid wearing your watch while in the
bath.
ー
Do not wear your watch while in a heated
swimming pool, sauna, or any other high
temperature/high humidity environment.
ー
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).
●
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.
●
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).
Watch Operation Guide 3545
2
●
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.)
●
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.
●
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.
●
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.
●
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.
●
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.
Watch Operation Guide 3545
3
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.
●
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.
ー
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.
●
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.
Battery
●
The special rechargeable battery used by
your watch is not intended to be removed or
replaced by you. Use of a rechargeable
battery other than the special one specified
for your watch can damage your watch.
●
The rechargeable (secondary) battery is
charged when the solar panel is exposed to
light, so it does not require regular
replacement as the primary battery
requires. Note, however, that long use or
operating conditions can cause the
capacity or charging efficiency of the
rechargeable battery to deteriorate. If you
feel that the amount of operation provided
by charging is too short, contact your
original retailer or CASIO service center.
Watch Operation Guide 3545
4
Before Getting
Started...
This section provides an overview of the watch
and introduces convenient ways it can be
used.
●
Watch Features
●
Solar Charging
Sunlight and artificial light generate
electricity for watch operation as it charges.
●
World Time
World Time displays the current time in any
of 31 time zones around the globe.
●
Alarm
An alarm sounds whenever a time specified
by you is reached.
●
Stopwatch
You can use the stopwatch to measure up
to 24 hours of elapsed time in units of 1/100
of a second.
●
Timer
Countdown from a start time specified by
you. An alarm sounds when the countdown
reaches zero.
Note
●
The illustrations included in this
operation guide have been created to
facilitate explanation. An illustration
may differ somewhat from the item it
represents.
General Guide
③
①
②
A Day of the week
B Month, day
C Hour, minute, second
A button
Holding down this button for at least two
seconds in any mode displays the setting
screen.
B button
Press to turn on illumination.
C button
Each press cycles between watch modes.
D button
Pressing this button while any setting screen
is displayed will change the setting.
Indicators
⑥
⑦
⑩
⑨
② ③ ④ ⑤①
⑧
A Displayed while the watch is indicating
summer time.
B Displayed during p.m. times while 12-hour
timekeeping is being used.
C Flashes when battery power is low.
D Displayed while Power Saving is enabled.
E Displayed while the button operation tone
is disabled.
F Displayed while the hourly time signal is
enabled.
G Displayed while an alarm is turned on.
H Displayed while the snooze alarm is
turned on.
I Displayed while Auto Light is enabled.
J Shows the current charge level.
Watch Operation Guide 3545
5
Navigating Between Modes
Each press of (C) cycles between watch
modes.
C
C
C
C
C
World Time ModeTimer Mode
Alarm Mode
Timekeeping Mode
Stopwatch Mode
Selecting a Timekeeping
Mode Digital Display Format
Each press of (A) in the Timekeeping Mode
toggles between the display information as
shown below.
Hour, minute, second
Day of the week
World Time City
Current World Time
Month, day
Charging
This watch runs on power supplied from a
rechargeable (secondary) battery that is
charged by a solar panel. The solar panel is
integrated into the face of the watch, and
power is generated whenever the face is
exposed to light.
●
Charging the Watch
When you are not wearing the watch, put it in
a location where it is exposed to bright light.
While you are wearing the watch, make sure
that its face (solar panel) is not blocked from
light by the sleeve of your clothing. Power
generation efficiency is reduced even when
the face of the watch is blocked only partially.
NOYES
Important!
●
Some light sources and environments
can cause the watch to become
extremely hot during charging, which
creates the risk of burn injury and
damage to internal watch
components.
Avoid charging the watch under
conditions like the ones described
below, where the temperatures may
exceed 60 °C (140 °F).
ー
On the dashboard of a vehicle
parked in the sun
ー
Near incandescent lamps, camera
lights, halogen lamps, or other
sources of heat
ー
In locations exposed to direct
sunlight for long periods and other
hot locations
●
The display panel may become black
(or white, depending on the LCD type)
under very high temperatures. This is
temporary, and the display will return
to normal at lower temperatures.
●
Checking the Charge Level
A display indicator shows the watch’s current
charge level.
Charge Level 1: Good
All functions enabled.
Charge Level 2: Good
All functions enabled.
Charge Level 3: Low
[L] and [LOW] flash on the display, and the
functions below become disabled.
●
Face illumination
●
Sounds (alarm, etc.)
Charge Level 4: Low
When the battery charge drops lower than
Level 3, [CHG] starts to flash on the display
and all functions become disabled.
Charge Level 5: Dead
The digital display will go blank if the battery
goes dead. Memory data is lost, and watch
settings are returned to their initial factory
defaults.
Important!
●
Should the battery go low or go dead,
expose the face (solar panel) to light as
soon as possible.
Watch Operation Guide 3545
6
Note
●
When [H], [M], and [L] are all flashing
on the display, it means that all
functions are disabled due to
momentary battery power
consumption.
l
[H], [M], and [L] are flashing on the
display.
●
Charging Time Guidelines
The table below shows guidelines for
approximate charging times.
Charging Times Required for 1 Day of
Operation
Light Level (Lux)
Approximate
Charging Time
50,000 5 minutes
10,000 24 minutes
5,000 48 minutes
500 8 hours
Charge Recovery Times
●
Sunny day, outdoors (50,000 lux)
Dead battery
n
Medium
charge
3 hours
Medium charge
n
High
charge
27 hours
High charge
n
Full charge
8 hours
●
Sunny day, near a window (10,000 lux)
Dead battery
n
Medium
charge
10 hours
Medium charge
n
High
charge
134 hours
High charge
n
Full charge
36 hours
●
Overcast day, near a window (5,000 lux)
Dead battery
n
Medium
charge
20 hours
Medium charge
n
High
charge
272 hours
High charge
n
Full charge
73 hours
●
Indoor fluorescent lighting (500 lux)
Dead battery
n
Medium
charge
249 hours
Medium charge
n
High
charge
-
High charge
n
Full charge
-
Note
●
Actual charging time depends on the
charging environment, watch settings,
and other factors.
●
Power Saving Function
Leaving the watch in a dark location for about
one hour between the hours of 10 p.m. and 6
a.m. will cause the display to go blank, and the
watch to enter Level 1 power saving. If the
watch is left in this condition for six or seven
days, the watch will enter Level 2 power
saving.
Power Saving Level 1 :
Digital display goes blank to save power.
Power Saving Level 2 :
Digital display goes blank to save power. All
functions are disabled.
Recovering from Power Saving Operation
Use one of the operations below to exit power
saving.
●
Press any button.
●
Move the watch to a bright location.
●
Trigger auto light by angling the watch
towards your face.
Note
●
The watch will not enter power saving
in the cases below.
ー
While in the Stopwatch Mode
ー
While in the Timer Mode
●
You can enable or disable Power
Saving.
l
Configuring Power Saving
Function Settings
●
Note that the watch also may enter
power saving if its face is blocked from
light by your sleeve while you are
wearing it.
Viewing the Face in the Dark
The watch has a light that illuminates the face
for viewing in the dark.
●
To illuminate the face manually
Press (B) to turn on illumination.
●
Illumination will turn off automatically if an
alarm starts to sound.
●
To illuminate the face when Auto Light
is enabled
If Auto Light is enabled, face illumination will
turn on automatically whenever the watch is
positioned at an angle of 40 degrees or more.
40
degrees
or more
Important!
●
Auto Light may not operate properly
when the watch is at a horizontal angle
of 15 degrees or greater from
horizontal as shown in the illustration
below.
●
Electro-static charge or magnetism
can interfere with proper auto light
operation. If this happens, try lowering
your arm and then angle it towards
your face again.
●
When moving the watch you may note
a slight rattling sound. This is due to
operation of the auto light switch,
which determines the current
orientation of the watch. It does not
indicate malfunction.
●
Frequent use of illumination will run
down the battery.
Watch Operation Guide 3545
7
Note
●
Auto Light is disabled when any one of
the conditions below exists.
ー
Alarm, timer alert, or other beeper
sounding
●
Configuring the Auto Light Setting
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (B) for at least three seconds
to toggle Auto Light between enabled and
disabled.
●
[LT] is displayed while Auto Light is
enabled.
Note
●
Auto Light is disabled while [CHG] is
shown on the display.
●
Specifying the Illumination Duration
You can select either 1.5 seconds or three
seconds as the illumination duration.
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) 10 times.
[LT] appears on the display with [1] or [3]
flashing.
4. Press (D) to select an illumination
duration.
[LT1]: 1.5-second light
[LT3]: 3-second light
5. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
Time Adjustment
Use the procedures in this section to adjust the
date and time settings.
Adjusting the Current Time
Setting
Use the procedures below to adjust the
current date and time settings, and to select a
Home City.
●
Setting a Home City
Use the procedure in this section to select a
city to use as your Home City. If you are in an
area that observes summer time, you can also
configure a summer time setting.
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Use (B) and (D) to change the Home City
setting.
●
Holding down (B) or (D) scrolls through
settings at high speed.
●
For details refer to the information
below.
l
City Table
Watch Operation Guide 3545
8
4. Press (C).
5. Use (D) to change the summer time
setting.
●
[OFF]
The watch always indicates standard
time.
●
[ON]
The watch always indicates summer
time.
6. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●
Setting the Time/Date
Important!
●
Configure the Home City setting before
changing the current time and date
settings.
l
Setting a Home City
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Use (C) to display the setting you want to
change.
●
Each press of (C) cycles through
settings in the sequence shown below.
Summer time
Home City
Minutes
Hours
Seconds
Illumination duration
Day
Month
Ye a r
12/24-hour timekeeping
Operation tone enable/disable
Power Saving
4. Configure the date and time settings.
●
While the seconds are flashing,
pressing (D) will reset them to 00. 1 is
added to the minutes when the current
seconds count is between 30 and 59
seconds.
●
For all the other settings, use (B) and (D)
to change the flashing setting.
Holding down (B) or (D) scrolls through
settings at high speed.
5. Repeat steps 3 and 4 to select time and
date settings.
6. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
Watch Operation Guide 3545
9
●
Switching between 12-hour and 24-
hour Timekeeping
You can specify either 12-hour format or 24-
hour format for the time display.
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) twice.
This causes [12H] or [24H] to flash on the
display.
4. Press (D) to select [12H] (12-hour
timekeeping) or [24H] (24-hour
timekeeping).
24-hour timekeeping12-hour timekeeping
5. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
World Time
World Time lets you look up the current time
in any of 48 cities (31 time zones) around the
globe.
Checking World Time
1. Enter the World Time Mode.
l
Navigating Between Modes
Entering the World Time Mode displays
the city code of the currently selected
World Time city.
●
Each press of (D) scrolls through city
codes.
●
To select UTC (Offset: 0) as the city
code, press (B) and (D) at the same
time.
●
For information about city codes, see
the information below.
l
City Table
City code
Setting the World Time City
Use the procedure in this section to select a
World Time city. If you are in an area that
observes summer time, you can also
configure a summer time setting.
1. Enter the World Time Mode.
l
Navigating Between Modes
2. Press (D) to display the city code of the
currently selected city.
●
Holding down (D) scrolls through
settings at high speed.
●
To select UTC (Offset: 0) as the city
code, press (B) and (D) at the same
time.
●
For information about city codes, see
the information below.
l
City Table
City code
3. If you want to configure the summer time
setting, hold down (A) for at least two
seconds.
[DST] is displayed along with summer
time.
●
Each time you hold down (A) for at least
two seconds, the setting toggles
between standard time and summer
time.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●
The summer time setting you configure
is applied to the currently selected city
only. It does not affect other cities.
Watch Operation Guide 3545
10
Alarm
The watch will beep when the alarm time is
reached. You can configure up to four
standard daily alarms, and one daily alarm
with snooze. The hourly time signal causes the
watch to beep every hour on the hour.
●
Snooze causes the alarm to sound up to
seven times, at five-minute intervals.
●
The alarm sound is muted in the cases
described below.
ー
When battery power is low
ー
When watch is at Level 2 power saving
l
Power Saving Function
Configuring Alarm Settings
1. Enter the Alarm Mode.
l
Navigating Between Modes
2. Press (D) to scroll through alarms ([1] to
[4], [SNZ]) until the one you want to
configure is displayed.
Alarm number
Alarm time
3. Hold down (A) for at least two seconds.
This causes the hours digits to flash.
Alarm hour
4. Use (B) and (D) to change the hour setting.
●
Holding down (B) or (D) scrolls through
settings at high speed.
●
If you are using 12-hour timekeeping,
[P] indicates p.m.
5. Press (C).
This causes the minutes digits to flash.
Alarm minute
6. Use (B) and (D) to set the minute setting.
7. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●
Testing the alarm
In the Alarm Mode, hold down (D) to sound the
alarm.
●
To stop the alarm
To stop the alarm after it starts to sound when
an alarm time is reached, press any button.
Snooze causes the alarm to sound up to seven
times, at five-minute intervals. To cancel a
snooze alarm, turn [SNZ] off.
l
Turning Off an Alarm or the Hourly Time
Signal
Note
●
A beeper will sound for 10 seconds to
let you know when the alarm time is
reached.
●
The watch will automatically return to
the Timekeeping Mode from the Alarm
Mode after two or three minutes of non-
operation.
Configuring the Hourly Time
Signal Setting
1. Enter the Alarm Mode.
l
Navigating Between Modes
2. Use (D) to display the hourly time signal
screen ([SIG]).
3. Press (A) to toggle the hourly time signal
between enabled and disabled.
●
[SIG] (hourly time signal) is shown on
the display while the hourly time signal
is enabled.
Turning Off an Alarm or the
Hourly Time Signal
To stop an alarm or the hourly time signal from
sounding, perform the steps below to turn it
off.
●
To have an alarm or hourly time signal
sound again, turn it back on.
Note
●
Indicators are displayed while any of
the alarms or the hourly time signal is
turned on.
●
The applicable indicators are not
displayed while all of the alarms are
turned off and/or the hourly time signal
is turned off.
Alarm
Snooze
Hourly time signal
Watch Operation Guide 3545
11
1. Enter the Alarm Mode.
l
Navigating Between Modes
2. Press (D) to scroll through alarm ([1] to [4],
[SNZ]) and hourly time signal ([SIG])
screens until the one you want to configure
is displayed.
Alarm number or hourly time signal
3. Press (A) to turn off the displayed alarm or
the hourly time signal.
●
Each press of (A) toggles between on
and off.
●
Turning off all alarms will cause [ALM]
(alarm) to disappear from the display,
while disabling the hourly time signal
causes [SIG] (hourly time signal) to
disappear from the display.
Note
●
If [ALM] (alarm) is still displayed, it
means that another alarm is still turned
on. To turn off all of the alarms, repeat
steps 2 and 3 until the [ALM] (alarm)
indicator is no longer displayed.
Stopwatch
The stopwatch measures elapsed time in units
of 1/100 second up to 23 hours, 59 minutes,
59.99 seconds (24 hours).
When this maximum limit is exceeded,
elapsed time measurement returns to 0 and
timing continues from there.
Measuring Elapsed Time
1. Enter the Stopwatch Mode.
l
Navigating Between Modes
Hours
Minutes, seconds,
1/100 seconds
2. Use the operations below to measure
elapsed time.
Stop
Resume
Stop
Start
3. Press (A) to reset the measurement time
to all zeros.
Measuring a Split Time
1. Enter the Stopwatch Mode.
l
Navigating Between Modes
Hours
Minutes, seconds,
1/100 seconds
2. Use the operations below to measure
elapsed time.
●
Pressing (A) displays the elapsed time
from the start of a race up to the point
when you pressed the button (split
time).
D
D
A
A
Stop
Split release
Split
Start
3. Press (A) to reset the measurement time
to all zeros.
Watch Operation Guide 3545
12
Timing the First and Second
Place Finishers
1. Enter the Stopwatch Mode.
l
Navigating Between Modes
Hours
Minutes, seconds,
1/100 seconds
2. Use the operations below to measure
elapsed time.
D
A
D
2nd Finisher*
1st Finisher*
Start
* This displays the time of the first
finisher.
3. Press (A) to display the time of the second
finisher.
4. Press (A) to reset the measurement time
to all zeros.
Timer
The timer counts down from a start time
specified by you. A beeper sounds when the
end of the countdown is reached.
●
The beeper is muted when battery power is
low.
Setting the Time
The countdown start time can be set in 1-
minute units up to 24 hours.
●
If a timer countdown operation is in
progress, reset the timer to its current start
time before performing this operation.
l
Using the Timer
1. Enter the Timer Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
This causes the hours digits to flash.
Hours
3. Use (B) and (D) to change the timer hours
setting.
●
Holding down (B) or (D) scrolls through
settings at high speed.
4. Press (C).
This causes the minutes digits to flash.
Minutes
5. Use (B) and (D) to change the timer
minutes setting.
6. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●
Setting a start time of [0:00] performs
a countdown of 24 hours.
Watch Operation Guide 3545
13
Using the Timer
The timer counts down time in 1-second units.
1. Enter the Timer Mode.
l
Navigating Between Modes
Hour, minute, second
2. Use the operations below to perform a
timer operation.
D
D
D
(Time up)
Resume
Pause
(Countdown starts)
Start
●
A beeper will sound for 10 seconds to
let you know when the end of a
countdown is reached.
●
You can reset a paused countdown to
its start time, by pressing (A).
3. Press any button to stop the tone.
Other Settings
This section explains other watch settings you
can configure.
Enabling the Button
Operation Tone
Use the procedure below to enable or disable
the tone that sounds when you press a button.
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) nine times.
This causes [KEY♪] or [MUTE] to flash on
the display.
4. Press (D) to select [KEY♪] or [MUTE].
[KEY♪]: Operation tone enabled.
[MUTE]: Operation tone disabled.
5. Press (A) to complete the setting
operation.
●
[
] is displayed while the operation
tone is muted.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●
Note that alarm and timer tones will still
sound even while the operation tone is
muted.
Configuring Power Saving
Function Settings
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) 11 times.
This displays [PS].
4. Press (D) to toggle between on and off.
[On]: Power Saving enabled.
[OFF]: Power Saving disabled.
5. Press (A) to complete the setting
operation.
Note
●
While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●
For details about Power Saving, refer
to the information below.
l
Power Saving Function
Watch Operation Guide 3545
14
Other Information
This section provides non-operational
information you also need to know. Refer to
this information as required.
City Table
City Offset
UTC
Coordinated
Universal Time
0
LIS Lisbon
LON London
MAD Madrid
+1
PAR Paris
ROM Rome
BER Berlin
STO Stockholm
ATH Athens
+2CAI Cairo
JRS Jerusalem
MOW Moscow
+3
JED Jeddah
THR Tehran +3.5
DXB Dubai +4
KBL Kabul +4.5
KHI Karachi +5
DEL Delhi +5.5
KTM Kathmandu +5.75
DAC Dhaka +6
RGN Yangon +6.5
BKK Bangkok +7
SIN Singapore
+8
HKG Hong Kong
BJS Beijing
TPE Taipei
SEL Seoul
+9
TYO Tokyo
ADL Adelaide +9.5
GUM Guam
+10
SYD Sydney
NOU Noumea +11
WLG Wellington +12
PPG Pago Pago -11
HNL Honolulu -10
ANC Anchorage -9
YVR Vancouver
-8
LAX Los Angeles
YEA Edmonton
-7
DEN Denver
MEX Mexico City
-6
CHI Chicago
NYC New York -5
SCL Santiago
-4
YHZ Halifax
City Offset
YYT St. John’s -3.5
RIO Rio de Janeiro -3
FEN
Fernando de
Noronha
-2
RAI Praia -1
●
The information in the above table is current
as of July 2023.
●
Time zones may change and UTC
differentials may become different from
those shown in the table above.
Specifications
Accuracy at normal temperature :
±15 seconds a month
Timekeeping :
Hour, minute, second, month, day, day of
the week
a.m./p.m.(P)/24-hour timekeeping
Full Auto Calendar (2000 to 2099)
Summer Time
World Time :
Displays current time in 48 cities (31 time
zones) and UTC
Summer time
Alarm :
Time alarms
Alarms: 5 (with one snooze alarm)
Setting units: Hours, minutes
Alarm tone duration: 10 seconds
Hourly time signal: Beep every hour on the
hour
Stopwatch :
Measuring unit: 1/100 second
Measuring range:
23 hours, 59 minutes, 59.99 seconds (24
hours)
Measurement Functions:
Elapsed time, split times, 1st and 2nd
place finisher times
Timer :
Measuring unit: 1 second
Countdown range: 24 hours
Setting unit: 1 minute
Time up: 10-second beeper
Other :
High-brightness LED light (Full Auto Light,
Super Illuminator, afterglow, 1.5 or 3-
second illumination duration setting), power
saving, battery level indicator, operation
tone on/off
Power Supply :
Solar panel and one rechargeable battery
Battery operating time: Approximately 13
months
Conditions:
Not exposed to light under the conditions
below.
●
Illumination: 1.5 seconds/day
●
Alarm: 10 seconds/day
●
Power Saving: 6 hours/day
Specifications are subject to change without
notice.
Watch Operation Guide 3545
15
Troubleshooting
World Time
Q1
The time for a World Time City is not
correct.
The summer time setting (standard time/
summer time) is wrong.
l
Setting the World Time City
Alarm and Hourly Time
Signal
Q1
An alarm does not sound.
Is the watch’s battery charged?
Keep the watch exposed to light until it
recharges sufficiently.
l
Charging
Other than the above.
The alarm’s settings may not be
configured. Configure the alarm settings.
l
Configuring Alarm Settings
Q2
The hourly time signal does not
sound.
Is the watch’s battery charged?
Keep the watch exposed to light until it
recharges sufficiently.
l
Charging
Other than the above.
The hourly time signal may be disabled.
Enable the hourly time signal.
l
Configuring the Hourly Time Signal
Setting
Charging
Q1
The watch does not work even
though it is exposed to light.
The watch stops operating whenever the
battery goes dead. Keep the watch exposed
to light until it recharges sufficiently.
l
Checking the Charge Level
Q2
[H], [M], and [L] are flashing on the
display.
The watch is in the charge recovery mode.
Wait until the recovery process is complete
(about 15 minutes). The watch will recover
more quickly if you place it in a brightly lit
location.
●
If an alarm, hourly time signal, illumination
and/or other power-intensive functions are
used within a short period of time, the
charging capacity of the battery will drop
and cause the watch to go into a charge
recovery mode. Function availability will be
temporarily limited, but functionality will
return after the battery recovers.
l
Checking the Charge Level
Q3
[CHG] is flashing on the display.
The charge level of the watch is extremely low.
Immediately expose the watch to light to
charge it.
l
Checking the Charge Level
Other
Q1
I can’t find the information I need
here.
Visit the website below.
https://world.casio.com/support/
Watch Operation Guide 3545
16
