MO0705-EA
Operation Guide 4765
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.
• The actual level at which some functions are disabled depends on the watch
model.
• Frequent display illumination can run down the battery quickly 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.
Keep the watch exposed to bright light
The electricity generated by the solar cell of the watch is
Bright Light
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.
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Solar cell
•
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 reduced significantly
if the face is only partially covered.
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.
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.
• 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 result in 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.
Battery charges in the light.
Battery discharges in the dark.
• Most of the display examples in this manual show only
the digital display, without the analog hands.
• 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.
Bright Light
Solar cell
(Converts light to
electrical power.)
Electrical
energy
All
functions
enabled
LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4
LEVEL 1
LEVEL 2
Some or all
functions
disabled
LEVEL 3
LEVEL 4
Dis-
charge
Charge
Rechargeable battery
Countdown Timer Mode
Stopwatch Mode
General Guide
• Press C to change from mode to mode.
• In any mode (except when a setting screen is on the display), press B to illuminate
the face of the watch.
Battery Level Indicator
World Time Mode
Timekeeping Mode
Press C.
Hand Setting Mode
Alarm Mode
Radio-controlled Atomic Timekeeping
This watch receives a time calibration signal and updates
its time setting accordingly.
• Supported time calibration signals: Germany
(Mainflingen), England (Rugby), United States (Fort
Collins), Japan.
Important!
Day
• Normally, your watch should show the correct time as soon as you select your Home
City code. If it does not, it should adjust automatically after the next auto receive
operation (in the middle of the night).You can also perform manual receive or you
can set the time manually.
Month
Seconds
• The watch will receive the time calibration signal automatically from the applicable
transmitter (in the middle of the night) and update its settings accordingly. For
information about the relationship between city codes and transmitters, see “Home
City Codes and Transmitters”.
• Under factory default settings, auto receive is turned off for all of the following city
codes: MOW (Moscow), HKG (Hong Kong), BJS (Beijing), HNL (Honolulu), and
ANC (Anchorage). For details about turning on auto receive for these city codes, see
“To turn auto receive on and off”.
• You can disable time signal reception, if you want. See “To turn auto receive on and
off” for more information.
• See the maps under “Reception Ranges” for information about the reception ranges
of the watch.
Current Time Setting
This watch adjusts its time setting automatically in
accordance with a time calibration signal.You can also
perform a manual procedure to set the time and date,
when necessary.
• The first thing you should do after purchasing this watch
is to specify your Home City (the city where you
normally will use the watch). For more information, see
“To specify your Home City”.
• When using the watch outside the areas covered by the time signal transmitters, you
will have to adjust the current time setting manually as required. See “Timekeeping”
for more information about manual time settings.
• The U.S. time calibration signal can be picked up by the watch while in North
America. The term “North America” in this manual refers to the area that consists of
Canada, the continental United States, and Mexico.
• The analog time of this watch is synchronized with the digital time. Because of this,
the analog time setting is automatically adjusted whenever you change the digital
setting. See “Analog Timekeeping” for more information.
• If you are in an area that does not use Daylight Saving Time (summertime), turn off
the DST setting.
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
• Auto Receive
With auto receive, the watch receives the time calibration signal automatically up to
six times a day. When any auto receive is successful, the remaining auto receive
operations are not performed. For more information, see “About Auto Receive”.
To specify your Home City
1. In the Timekeeping Mode, hold down A the city code
starts to flash. This is the setting screen.
2. Press D(east) to select the city code you want to use
as your Home City.
City code
• Manual Receive
Manual receive lets you start a time calibration receive operation with the press of a
button. For more information, see “To perform manual receive”.
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• Time calibration signal reception is supported when
any one of the city codes shown in the table below is
selected as your Home City.
Important!
• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o’clock side facing towards a window.
Make sure there are no metal objects nearby.
German/U.K. Signal
Japan Signal
U.S. Signal
City City
City City
City City
City City
City City
Code Name
Code Name
Code Name
Code Name
Code Name
LIS
Lisbon
ATH Athens HKG Hong Kong HNL Honolulu
MOW Moscow BJS Beijing
TPE Taipei
YWG Winnipeg
12 o’clock
or
LON London
MAD Madrid
PAR Paris
ANC Anchorage CHI Chicago
YVR Vancouver
MIA Miami
SEL Seoul
TYO Tokyo
LAX Los Angeles YTO Toronto
ROM Rome
BER Berlin
STO Stockholm
YEA Edmonton
DEN Denver
NYC New York
YHZ Halifax
MEX Mexico City YYT St. Johns
3. Press A to exit the setting screen.
• Make sure the watch is facing the right way.
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Operation Guide 4765
Stopwatch
The stopwatch lets you measure elapsed time, split times,
Signal Reception Troubleshooting
1/100 second
Seconds
and two finishes.
Check the following points whenever you experience problems with signal reception.
• The display range of the stopwatch is 59 minutes, 59.99
seconds.
Problem
Probable Cause
What you should do
• 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.
Cannot perform
•
The watch is not in the Timekeeping Mode. • Enter the Timekeeping
manual receive. • Your current Home City is not one of
the following:
Mode and try again.
• Select LIS, LON, MAD, PAR,
ROM, BER, STO, ATH, MOW,
HKG, BJS,TPE, SEL,TYO,
HNL, ANC,YVR, LAX,YEA,
DEN, MEX,YWG, CHI, MIA,
YTO, NYC,YHZ, or YYT as
your Home City.
LIS, LON, MAD, PAR, ROM, BER, STO,
ATH, MOW, HKG, BJS,TPE, SEL,TYO,
HNL, ANC,YVR, LAX,YEA, DEN, MEX,
YWG, CHI, MIA,YTO, NYC,YHZ, or
YYT
Minutes
• All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing C.
Time setting is • If the time is one hour off, the DST
• Change the DST setting to
incorrect
setting may be incorrect.
Auto DST.
To measure times with the stopwatch
Elapsed Time
following signal • The Home City code setting is not
• Select the correct Home City
code.
reception.
correct for the area where you are
using the watch.
• For further information, see “Important!” under “Time Calibration Signal Reception”
and “Radio-controlled Atomic Timekeeping Precautions”.
D
Re-start
➤D
Stop
➤A
Clear
D
Start
➤D
Stop
➤
Split Time
World Time
A
A
➤D
Stop
➤
D
Start
➤A
Split
displayed)
➤
The World Time Mode digitally displays the current time in
48 cities (29 time zones) around the world.
Split release
Clear
City code
(
• If the current time shown for a city is wrong, check your
Home City time settings and make the necessary
changes.
• The watch will perform a signal reception even if it is in
the World Time Mode when a calibration time is
reached. If this happens, the World Time Mode time
settings will be adjusted in accordance with the
Timekeeping Mode’s Home City time.
Two Finishes
A
D
Stop
Second runner
finishes.
➤A
Split release
Display time of
second runner.
➤
D
Start
➤A
Split
➤
Clear
First runner
finishes.
Display time of
first runner.
• All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C.
Current time in
selected city
Alarm
To view the time in another city
When the alarm is turned on, the alarm sounds when the
alarm time is reached.You can also turn on an Hourly
Time Signal, which will cause the watch to beep twice
every hour on the hour.
While in the World Time Mode, press D to scroll through the city codes (time zones)
to the east.
• For full information on city codes, see the “City Code Table”.
On/Off status
2 seconds
• When the alarm is turned on, the alarm screen
alternates between ALON (alarm on) and the current
alarm time (hour and minutes). When the alarm is off,
ALOF (alarm off) remains on the alarm screen.
• All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
• Pressing D in the Alarm Mode toggles between the
alarm screen and Hourly Time Signal screen.
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 to toggle Daylight Saving Time (DST
indicator displayed) and Standard Time (DST indicator
not displayed).
Alarm Screen
L
Press D.
L
DST indicator
• Note that you cannot use the World Time Mode to change the DST setting of the
Home City code you currently have selected in the Timekeeping Mode. See “To
change the Daylight Saving Time (summer time) setting” for information about
turning the Home City code DST setting on and off.
• The DST indicator will appear on the display whenever you display a city code for
which Daylight Saving Time is turned on.
Hourly Time Signal Screen
To set the alarm time
1. In the Alarm Mode, press D to display the alarm
screen.
2. Hold down A until the hour setting of the alarm time
starts to flash, which indicates the setting screen.
• This operation automatically turns on the alarm.
3. Press C to move the flashing between the hour and
minute settings.
Alarm time
(Hour : Minutes)
• Note that the DST/Standard Time setting affects only the currently displayed city
code. Other city codes are not affected.
Countdown Timer
4. While a setting is flashing, use D (+) and B (–) to
change it.
You can set the countdown timer within a range of one to
60 minutes. An alarm sounds when the countdown
reaches zero.
Seconds
• 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).
• Calibration signal reception (both auto and manual) is
disabled while a countdown timer operation is in
progress.
5. Press A to exit the setting screen.
• All of the operations in this section are performed in the
Countdown Timer Mode, which you enter by pressing
C.
Alarm Operation
The alarm sounds at the preset time for about 10 seconds, regardless of the mode the
watch is in.
• To stop the alarm tone after it starts to sound, press any button.
• Alarm and Hourly Time Signal operations are performed in accordance with the
Timekeeping Mode digital time.
Minutes
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.
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
• If the countdown start time is not displayed, use the procedure under “To use the
To turn the alarm and the Hourly Time Signal on and off
countdown timer” to display it.
1. In the Alarm Mode, press D to select the alarm or the
2. While a setting is flashing, use D (+) and B (–) to change it.
3. Press A to exit the setting screen.
On/Off status
Hourly Time Signal screen.
2. Press A to toggle the currently selected function on
(ON displayed) and off (OF displayed).
• The alarm on indicator and the Hourly Time Signal on
indicator remain on the display in all modes while these
functions are turned on.
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.
Hourly time signal
on indicator
Alarm on indicator
• Press D while a countdown operation is in progress to pause it. Press D again to
resume the countdown.
• To completely stop a countdown operation, first pause it (by pressing D), and then
press A. This returns the countdown time to its starting value.
Illumination
An LED (light-emitting diode) and light guide panel
illuminate the digital display for easy reading in the dark.
• See “Illumination Precautions” for other important
information.
To turn on illumination
In any mode (except when a setting is on the display),
press B to illuminate the display.
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Operation Guide 4765
Timekeeping
Use the Timekeeping Mode to set and view the current time and date. This section
also explains how to manually set the current date and time.
• When setting the time, you can also configure settings for the illumination duration
and the 12/24-hour format.
• All of the operations in this section are performed in the Timekeeping Mode, which
you can enter by pressing C.
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 and the DST setting screen appears.
3. Use D to cycle through the DST settings in the sequence shown below.
Day
Month
Seconds
PM indicator
Day of week
Auto DST (AUTO)
DST off (OFF)
DST on (ON)
Press A.
A
4. When the setting you want is selected, press A to exit the setting screen.
• The DST indicator ( ) appears on the display to indicate that Daylight Saving Time
is turned on.
Analog Timekeeping
The analog time of this watch is synchronized with the digital time. The analog time
setting is adjusted automatically whenever you change the digital time.
Hour : Minutes
L
A
Note
• Pressing D in the Timekeeping Mode will display the Last Signal screen.
Last Signal Screen
• The hands for the analog timepiece move to adjust to a new setting whenever any of
the following occurs.
When you change the digital time setting manually
When the digital time setting is changed by time calibration signal reception
When you change the Home City code and/or DST setting
• If the analog time does not match the digital time for any reason, use the procedure
described under “To adjust the analog time” to match the analog setting to the digital
setting.
Press D.
• Whenever you need to adjust both the digital and the analog time settings manually,
make sure you adjust the digital setting first.
• Depending on how much the hands have to move in order to adjust to the digital
time, it may take some time before they stop moving.
Setting the Digital Time and Date Manually
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 adjust the analog time
1. In the Timekeeping Mode, press C six times to enter
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the Hand Setting Mode.
2. Hold down A until the current digital time starts to
flash, which indicates the setting screen.
3. Use D and B to adjust the analog setting as
described below.
To set the current digital time and date manually
1. In the Timekeeping Mode, hold down A until the city
City code
code starts to flash, which indicates the setting screen.
2. Press C to move the flashing in the sequence shown
below to select other settings.
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When you want to do this:
Move the hand setting
forward 20 seconds
Perform this button operation:
• Press D.
Move the hand setting a short
way forward at high speed
• Hold down D.
• Release D when the hands reach the setting
you want.
12/24-Hour
Format
Move the hand setting a
long way forward at high
speed
• While holding down D to move the hands at
high speed, press B to lock the high-speed
hand movement.
• To stop the hand movement, press any
button.
DST
Day
Seconds
Year
Hour
City Code
Power
Saving
Month
Minutes
3. When the setting you want to change is flashing, use D to change it as described
below.
• Hand movement stops automatically if the hour
hand makes one full (12-hour) revolution.
Screen:
To do this:
Do this:
4. Press A to exit the setting screen.
• The minute hand will be adjusted slightly to match the seconds when you exit the
setting screen.
Change the city code
Press D (east).
Cycle between Daylight Saving Time Press D.
(ON), Standard Time (OFF), and
Auto DST (AUTO)
Toggle between 12-hour (12H) and Press D.
24-hour (24H) timekeeping
• To return to the Timekeeping Mode, press C.
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.
Reset the seconds to 00
Press D.
Change the hour or minutes
Press D (+).
Example: Orient the watch so its face
is pointing at a light source.
Solar cell
• The illustration shows how to position
a watch with a resin band.
Change the year
• 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 reduced
significantly if the face is only partially
covered.
Change the month or day
Toggle Power Saving on (PSON)
and off (PSOF)
Press D.
• See “City Code Table” for a complete list of available city codes.
• Auto DST (AUTO) can be selected only while LIS, LON, MAD, PAR, ROM, BER,
STO, ATH, MOW, HKG, BJS, TPE, SEL, TYO, HNL, ANC, YVR, LAX, YEA, DEN,
MEX, YWG, CHI, MIA, YTO, NYC, YHZ, or YYT is selected as the Home City code.
For more information, see “Daylight Saving Time (DST)” below.
• For information about settings other than the time and date, see the following.
Power Saving: Power Saving Function
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.
4. Press A to exit the setting screen.
Daylight SavingTime (DST)
• 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 charge fully, 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 5 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.
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.
The time calibration signals transmitted from Mainflingen (Germany), Rugby
(England), or Fort Collins (the United States) include both Standard Time and DST
data. When the Auto DST setting is turned on, the watch switches between Standard
Time and DST (summer time) automatically in accordance with the signals.
• The time calibration signals transmitted from Fukushima and Fukuoka/Saga (Japan)
do not include summer time data.
• The default DST setting is Auto DST (AUTO) whenever you select LIS, LON, MAD,
PAR, ROM, BER, STO, ATH, MOW, HKG, BJS, TPE, SEL, TYO, HNL, ANC, YVR,
LAX, YEA, DEN, MEX, YWG, CHI, MIA, YTO, NYC, YHZ, or YYT as your Home City
code.
• If you experience problems receiving the time calibration signal in your area, it is
probably best to switch between Standard Time and Daylight Saving Time (summer
time) manually.
To check the current battery level
Press C to display the battery level indicator.
Battery level indicator
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Operation Guide 4765
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.
The battery level indicator shows you the current power level of the rechargeable battery.
Level Battery Level Indicator
Function Status
Power Saving Function
1
All functions enabled.
When turned on, the Power Saving function enters a sleep
state automatically whenever the watch is left in an area
Power saving indicator
where it is dark for a certain period. The table below
shows how watch functions are affected by the Power
Saving function.
2
All functions enabled.
l
Alarm, hourly time signal, illumination and
time calibration signal reception disabled.
3
(Charge Soon Alert)
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4
All functions disabled.
(Charge Soon Alert)
Elapsed Time
in Dark
Displa
Operation
All functions, including timekeeping,
disabled and initialized.
5
60 to 70 minutes Blank, with Power Saving
indicator ( ) flashing
All functions enabled, except
for the display
• The flashing Low indicator (L) at Level 3 and the flashing charge indicator (C) at
Level 4 tell you that battery power is very low, and that exposure to bright light for
charging is required as soon as possible.
• At Level 5, 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 4
(indicated by the flashing charge indicator (C)) from Level 5.You will not be able to
configure any of the other settings until the battery reaches Level 3 (no charge
indicator) after dropping to Level 5.
6 or 7 days
Blank, with Power Saving
indicator ( ) not flashing
•Beeper tone, illumination, and
display disabled
•Analog timekeeping stopped
at 12 o’clock
•Auto receive disabled
• 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 9:59 PM. If the watch
is already in the sleep state when 6:00 AM arrives, however, it will remain in the
sleep state.
•
Leaving the watch in direct sunlight or some other very strong light source can cause
the battery level indicator to show a reading that is momentarily higher than the actual
battery level. The correct battery level indicator should appear after a few minutes.
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area.
• Press any button.
• The watch’s Home City code setting will change automatically to TYO (Tokyo)
whenever the battery drops to Level 5. With this Home City code setting, the watch is
configured to receive the time calibration signals of Japan. If you are using the watch
in North America or Europe, you will need to change the Home City code setting to
match your location whenever the battery drops to Level 5.
• If you use the illumination or alarms a number of times during a short period, the
hands of the watch will stop. Battery Level Indicator will show “R” at this time. Also,
the following operations will become disabled until battery power recovers.
Illumination
Beeper tone
Time calibration signal reception
After some time, battery power will recover and the above functions will be enabled
again.
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down A until the city
On/Off status
code starts to flash, which indicates the setting screen.
2. Press C nine times until the Power Saving on/off
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screen appears.
3. Press D to toggle Power Saving on (PSON) and off
(PSOF).
4. Press A to exit the setting screen.
The Power Saving indicator ( ) is on the display in all
modes while Power Saving is turned on.
•
Button Operation Tone
Charging Precautions
In any mode (except when a setting screen is on the display), hold down C for about
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.
three seconds to toggle the button operation tone on and off. The button operation
tone off indicator (
) is displayed while the tone is turned off.
• Even if the button operation tone is turned off, the daily alarm and countdown timer
alarm continue to sound when required.
Auto Return Features
Warning!
• If you leave the watch in the Alarm or Hand Setting Mode, or with the Battery Level
indicator displayed 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.
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
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 through the data at high speed.
Charging Guide
After a full charge, timekeeping remains enabled for up to about 7 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.
Initial Screens
When you enter the World Time Mode, the data you were viewing when you last exited
the mode appears first.
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Approximate Exposure Time
8 minutes
Radio-controlled Atomic Timekeeping Precautions
Sunlight Through a Window (10,000 lux)
30 minutes
• Strong electrostatic charge can result in the wrong time being set.
• The time calibration signal bounces off the ionosphere. Because of this, such factors
as changes in the reflectivity of the ionosphere, as well as movement of the
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of
day may change the reception range of the signal and make reception temporarily
impossible.
Daylight Through a Window on a Cloudy Day
(5,000 lux)
48 minutes
Indoor Fluorescent Lighting (500 lux)
8 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
• Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
• 10 seconds of alarm operation per day
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• The watch is designed to automatically update the date and day of the week for the
period January 1, 2000 to December 31, 2099. Setting of the date by the time
calibration signal cannot be performed starting from January 1, 2100.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• 10 minutes of signal reception per day
• Stable operation is promoted by frequent exposure to light.
RecoveryTimes
The table below shows the amount exposure that is required to take the battery from
one level to the next.
Exposure Level
(Brightness)
Approximate Exposure Time
• Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.
Level 5 Level 4 Level 3
Level 2
Level 1
• Normally, the signal reception date shown by the Last Signal screen is the date data
included in the received time calibration signal. When only time data is received,
however, the Last Signal screen shows the date as kept in the Timekeeping Mode at
the time of signal reception.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within 15 seconds a month at normal temperature.
• If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your current city code, DST (summer
time), and auto receive settings.
Outdoor Sunlight (50,000 lux)
2 hours
7 hours
25 hours 6 hours
94 hours 22 hours
152 hours 35 hours
– – –
Sunlight Through a Window
(10,000 lux)
Daylight Through a Window on
a Cloudy Day (5,000 lux)
10 hours
126 hours
Indoor Fluorescent Lighting
(500 lux)
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
5
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Operation Guide 4765
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 5.
• 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.
• The times for the Timekeeping Mode and all the city codes of the World Time Mode
are calculated in accordance with each city’s UTC differential.
• 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.
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
• Illumination may be hard to see when viewed under direct sunlight.
• Illumination automatically turns off whenever an alarm sounds.
• Frequent use of illumination runs down the battery.
City Code Table
City
Code
PPG
HNL
ANC
YVR
LAX
YEA
DEN
MEX
YWG
CHI
GMT
Differential
–11.0
City
Other major cities in same time zone
Papeete
Pago Pago
Honolulu
Anchorage
Vancouver
Los Angeles
Edmonton
Denver
Mexico City
Winnipeg
Chicago
Miami
Toronto
New York
Caracas
Halifax
St. Johns
Rio De Janeiro
Praia
–10.0
–09.0
Nome
San Francisco, Las Vegas,
Seattle/Tacoma, Dawson City, Tijuana
–08.0
–07.0
El Paso, Edmonton, Culiacan
–06.0
Houston, Dallas/Fort Worth, New Orleans
MIA
Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
YTO
NYC
CCS
YHZ
YYT
RIO
–05.0
–04.0
La Paz, Santiago, Port Of Spain
–03.5
–03.0
–01.0
Sao Paulo, Buenos Aires, Brasilia, Montevideo
RAI
LIS
Lisbon
+00.0
Dublin, Casablanca, Dakar, Abidjan
LON
MAD
PAR
ROM
BER
STO
ATH
CAI
JRS
MOW
JED
THR
DXB
KBL
KHI
London
Madrid
Paris
Rome
Berlin
Stockholm
Athens
Cairo
Jerusalem
Moscow
Jeddah
Tehran
Dubai
Kabul
Karachi
Delhi
+01.0
Milan, Amsterdam, Algiers, Hamburg, Frankfurt, Vienna
Helsinki, Istanbul, Beirut, Damascus, Cape Town
Kuwait, Riyadh, Aden, Addis Ababa, Nairobi
+02.0
+03.0
+03.5
+04.0
+04.5
+05.0
+05.5
Shiraz
Abu Dhabi, Muscat
Male
DEL
Mumbai, Kolkata, Colombo
DAC
RGN
BKK
HKG
BJS
TPE
SEL
TYO
ADL
GUM
SYD
NOU
WLG
Dhaka
Yangon
Bangkok
Hong Kong
Beijing
Taipei
Seoul
Tokyo
Adelaide
Guam
Sydney
Noumea
Wellington
+06.0
+06.5
+07.0
Jakarta, Phnom Penh, Hanoi, Vientiane
+08.0
Singapore, Kuala Lumpur, Manila, Perth, Ulaanbaatar
Pyongyang
Darwin
+09.0
+09.5
+10.0
Melbourne, Rabaul
+11.0
+12.0
Port Vila
Christchurch, Nadi, Nauru Island
• Based on data as of December 2006.
6
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