Casio 3108 User manual

Operation Guide 3108
1
MO0711-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.
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
reduced significantly if the face is only partially
covered.
l
l
l
l
l
l
l
l
l
l
l
Bright Light
Solar cell
All
functions
enabled
LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4
Charge
Rechargeable battery
Bright Light
Electrical
energy
Solar cell
(Converts light to
electrical power.)
Some or all
functions
disabled
LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4
Dis-
charge
Battery charges in the light. Battery discharges in the dark.
•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.
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 this product or its malfunction.
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.
•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.
•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.
▲
Stopwatch Mode
Countdown Timer ModeAlarm Mode
General Guide
•Press Cto change from mode to mode.
•In any mode, press Lto illuminate the display for about one second.
Timekeeping Mode
Press C.
World Time Mode
▲
▲
▲
▲
Radio-controlled Atomic Timekeeping
Your watch receives a time calibration signal and
updates its time setting accordingly.
•This watch is designed to receive the time
calibration signal transmitted from Shangqiu
City, Henan Province, China (Call Sign: BPC,
Frequency: 68.5 kHz).
•Your watch will be able to receive the signal
whenever Beijing (BJS) or Hong Kong (HKG) is
selected as its Home City, and the watch is
within range of the transmitter.The initial
factory Home City setting of the watch is
Beijing (BJS), so you will not need to change
the setting if you are in the same time zone
(GMT+8) as Beijing.
Transmitter
Long-wave
time
calibration
signal
Watch
•As of July 2007, China does not use Daylight Saving Time (DST). If China
does go to the Daylight Saving Time system in the future, some functions of
this watch may no longer operate correctly.
•See the information under “Signal Reception Troubleshooting” if you
experience problems with time calibration signal reception.
Chinese Time Calibration Signal
The Chinese time calibration signal (BPC) is maintained by the National Time
Service Center (http://www.ntsc.ac.cn/) of the Chinese Academy of Sciences,
and is transmitted from a transmitter (68.5 kHz) located in Shangqiu. The time
data of the Chinese time calibration signal is maintained by the National Time
Service Center.
•Note that transmission of the calibration signal may be interrupted
occasionally due to maintenance, lightning, etc.

Operation Guide 3108
2
Current Time Setting
This watch adjusts its time setting automatically in accordance with a time
calibration signal.You also can perform a manual procedure to set the time
and date, when necessary.
•Whenever you need to travel outside of the time zone where Beijing is
located (GMT+8), use the procedure under “To specify your Home City”to
change the watch’s Home City setting as required.
•When using the watch outside the range of the time calibration signal
transmitter, you have to adjust the current time setting manually as
required. See “Timekeeping”for more information about manual time
settings.
To specify your Home City
1. In the Timekeeping Mode, hold down Auntil
the city code starts to flash. This is the setting
screen.
2. Use D(east) and B(west) to scroll through
the city codes and display the one you want to
use as your Home City.
•If you want the watch to receive the Chinese
time calibration signal, you should select
BJS (Beijing) or HKG (Hong Kong) as your
Home City.
•For full information on city codes, see the
“City Code Table”.
3. Press Ato exit the setting screen.
•You can disable time signal reception, if you want. See “To turn auto receive
on and off”for more information.
•If you are in an area that does not use Daylight Saving Time (summer time),
turn off the DST setting.
City code
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 five times a day. When any auto receive is successful,
the remaining auto receive operations are not performed. For more
information, see “About Auto Receive”.
•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”.
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. This watch is designed to receive a time calibration signal late at
night. Because of this, you should place the watch near a window as shown
in the illustration when you take it off at night. Make sure there are no metal
objects nearby.
•Make sure the watch is facing the right way.
12 o’clock
or
•Proper signal reception can be difficult or even impossible under the
conditions listed below.
•Signal reception normally is better at night than during the day.
•Time calibration signal reception takes from one to seven minutes. Take
care that you do not perform any button operations or move the watch
during this time.
Inside or
among
buildings
Inside a
vehicle
Near
household
appliances,
office
equipment,
or a mobile
phone
Near a
construction
site, airport,
or other
sources of
electrical
noise
Near high-
tension
power lines
Among or
behind
mountains
500 km
Changchun
Shanghai
Hong Kong
Shangqiu
Chengdu
Beijing
1,500 km
Approximate Reception Range
•At distances further than about 500 kilometers from the Shangqiu (China)
transmitter, signal reception may not be possible during certain times of
year or times of day. Radio interference also may cause problems with
reception.
•Even when the watch is within the reception range of the transmitter, signal
reception will be impossible if the signal is blocked by mountains or other
geological formations between the watch and signal source.
•Signal reception is affected by weather, atmospheric conditions, and
seasonal changes.
About Auto Receive
The watch starts to receive the time calibration signal automatically when the
time in the Timekeeping Mode reaches 1:00 a.m., 2:00 a.m., 3:00 a.m.,
4:00 a.m., and 5:00 a.m. each day (calibration times). When any auto receive
is successful, the remaining auto receive operations are not performed.
Note
•When a calibration time is reached, the watch will receive the calibration
signal only if it is in either the Timekeeping Mode or World Time Mode.
Reception is not performed if a calibration time is reached while you are
configuring settings.
•Auto receive of the calibration signal is designed to be performed early in
the morning, while you sleep (provided that the Timekeeping Mode time is
set correctly). Before going to bed for the night, remove the watch from your
wrist, and put it in a location where it can receive the signal easily.
•The watch receives the calibration signal for one to seven minutes everyday
when the time in the Timekeeping Mode reaches each of the calibration
times. Avoid performing any button operation within seven minutes before or
after any one of the calibration times. Button operation can interfere with
correct calibration.
•Remember that reception of the calibration signal depends on the current
time in the Timekeeping Mode. The receive operation will be performed
whenever the display shows any one of the calibration times, regardless of
whether or not the displayed time actually is the correct time.
•Calibration signal reception is disabled while a countdown timer operation
is in progress.
About the Receiving Indicator
The receiving indicator shows the strength of the calibration signal being
received. For best reception, be sure to keep the watch in a location where
signal strength is strongest.
Weak
(Level 0)
Strong
(Level 3)
Receiving indicator
•Use the receiving indicator as a guide for checking signal strength and for
finding the best location for the watch during signal receive operations.
•Even in an area where signal strength is strong, it takes about 10 seconds
for signal reception to stabilize enough for the receiving indicator to indicate
signal strength.

Operation Guide 3108
3
To perform manual receive
1. Enter the Timekeeping Mode.
2. Place the watch on a stable surface so its
12 o’clock side is facing towards a window.
3. Hold down Dfor about two seconds until RC!
appears on the display.
•Time calibration signal reception takes from
one to seven minutes. Take care that you do
not perform any button operations or move the
watch during this time.
•If the receive operation is successful, the
reception date and time appear on the display,
along with the GET indicator.
The watch will enter the Timekeeping Mode if
you press Dor if you do not perform any
button operation for about two or three minutes.
Receiving
Receive successful
Receive time
Receive date
•If the current reception fails but a previous
reception was successful, the display shows
the previous reception’s date and time, and the
ERR indicator.
- - : - - indicates that none of the reception
operations were successful.
The watch will enter the Timekeeping Mode
without changing the time setting if you press
Dor if you do not perform any button
operation for about two or three minutes.
Receive failed
To turn auto receive on and off
1. In the Timekeeping Mode, press Dto display
the Last Signal screen.
2. Press Aso the current auto receive setting
(on or OFF) is flashing. This is the setting
screen.
•Note that the setting screen will not appear
if the currently selected Home City is one
that does not support time calibration
reception.
3. Press Dto toggle auto receive on (on) and off
(OFF).
4. Press Ato exit the setting screen.
•For information about city codes that support
signal receive, see “To specify your Home City”.
On/Off status
To check the latest signal reception results
In the Timekeeping Mode, press Dto display the
Last Signal screen.
•When receive is successful, the display shows
the time and date that receive was successful.
- - : - - indicates that none of the reception
operations were successful.
•To return to the Timekeeping Mode, press D.
Receive date
Receive time
Problem
Cannot perform
manual
receive.
Time setting is
incorrect
following signal
reception.
Probable Cause
•The watch is not in the
Timekeeping Mode.
•Your current Home City is not
one of the following:
BJS or HKG
•Radio interference is often
present during the day time,
which can interfere with
calibration signal reception.
•The Home City code setting is
not correct for the area where
you are using the watch.
What you should do
•Enter the Timekeeping
Mode and try again.
•Select BJS or HKG as
your Home City.
•Check to make sure the
watch is in a location
where it can receive the
signal.
•Select the correct Home
City code.
Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal
reception.
•For further information, see “Important!”under “Time Calibration Signal
Reception”and “Radio-controlled Atomic Timekeeping Precautions”.
World Time
The World Time Mode shows you the current
time in 48 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.
To view the time in another city
In the World Time Mode, use D(east) and B
(west) to scroll through the city codes (time
zones).
•For full information on city codes, see the “City
Code Table”.
Current time in
selected city
City code
To toggle a city code time between Standard Time and Daylight
Saving Time
1. In the World Time Mode, use Dor B to
display the city code (time zone) whose
Standard Time/Daylight Saving Time setting
you want to change.
2. Hold down Ato toggle Daylight Saving Time
(DST indicator displayed) and Standard Time
(DST indicator not displayed).
•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
Stopwatch
The stopwatch lets you measure elapsed time,
split times, and two finishes. It also includes Auto-
Start.
•The display range of the stopwatch is
999 hours, 59 minutes, 59.99 seconds.
•The stopwatch continues to run, restarting from
zero after it reaches its limit, until you stop it.
•The stopwatch measurement operation
continues even if you exit the Stopwatch Mode.
•Exiting the Stopwatch Mode while a split time is
frozen on the display clears the split time and
returns to elapsed time measurement.
•All of the operations in this section are
performed in the Stopwatch Mode, which you
enter by pressing C.
1/100 second
Hours
Minutes Seconds
To measure times with the stopwatch
Elapsed Time
D
Start Stop Re-start ClearStop
DDB
D
➤➤➤➤
Split Time
D
Start Split
(SPL displayed)
Split release ClearStop
BDB
B
➤➤➤➤
Two Finishes
D
Start Split
First runner finishes.
Display time of first
runner.
Stop
Second runner
finishes.
ClearSplit release
Display time of
second runner.
DBB
B
➤➤➤➤
About Auto-Start
With Auto-Start, the watch performs a 5-second countdown, and stopwatch
operation starts automatically when the countdown reaches zero.
During the final three seconds of the countdown, a beeper sounds with each
second.
To use Auto-Start
1. While the stopwatch screen is showing all
zeros in the Stopwatch Mode, press A.
•This displays a 5-second countdown screen.
•To return to the all zeros screen, press A
again.
2. Press Dto start the countdown.
•When the countdown reaches zero, a tone
sounds and a stopwatch timing operation starts
automatically.
•Pressing Dwhile the Auto-Start countdown is
in progress starts the stopwatch immediately.

Operation Guide 3108
4
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.
To set the countdown start time
1. While the countdown start time is on the
display in the Countdown Timer Mode, hold
down Auntil 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 Ato exit the setting screen.
1/10 second
Timekeeping
Mode time
Minutes Seconds
To use the countdown timer
Press Dwhile 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
reset automatically to its starting value after the alarm stops.
•Press Dwhile a countdown operation is in progress to pause it. Press D
again to resume the countdown.
•To stop a countdown operation completely, first pause it (by pressing D),
and then press B. This returns the countdown time to its starting value.
Alarms
You can set five independent Daily Alarms. When
an alarm is turned on, the alarm tone sounds when
the alarm time is reached. One of the alarms can
be configured as a snooze alarm or a one-time
alarm, while the other four are one-time alarms.
You also can turn on an Hourly Time Signal that
causes the watch to beep twice every hour on the
hour.
•There are five alarm screens numbered 1
through 5. The hourly time signal screen is
indicated by :00
•When you enter the Alarm Mode, the screen
you were viewing when you last exited the
mode appears first.
•All of the operations in this section are
performed in the Alarm Mode, which you enter
by pressing C.
Timekeeping Mode time
Alarm number
Alarm time (Hour : Minutes)
To set an alarm time
1. In the Alarm Mode, use Dto scroll through
the alarm screens until the one whose time
you want to set is displayed.
x3
x4
x1 x2
:00 x5
•You can configure Alarm1as a snooze alarm or a one-time alarm.
Alarms 2through 5can be used as one-time alarms only.
•The snooze alarm repeats every five minutes.
2. After you select an alarm, hold down Auntil the hour setting of the alarm
time starts to flash. This indicates the setting screen.
3. Press Cto move the flashing between the hour and minute settings.
4. While a setting is flashing, use D(+) and B(–) to change it.
•When setting the alarm time using the 12-hour format, take care to set
the time correctly as a.m. (no indicator) or p.m. (Pindicator).
5. Press Ato exit the setting screen.
Alarm Operation
The alarm sounds at the preset time for about 10 seconds. 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 or change it to a one-time alarm.
Note
•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 Alarm
1 setting screen
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
To turn Alarms
22
22
2
through
55
55
5
on and off
1. In the Alarm Mode, use Dto select a one-
time alarm (alarm number 2through 5).
2. Press Bto toggle the displayed alarm on and
off.
•Turning on a one-time alarm (2through 5)
displays the one-time alarm on indicator on
the alarm screen. The one-time alarm on
indicator also is displayed in all modes when
any alarm is on.
One-time alarm on
indicator
To select the operation of Alarm
11
11
1
1. In the Alarm Mode, use Dto select Alarm1.
2. Press Bto cycle through the available settings in the sequence shown
below.
Snooze alarm on indicator and one-time alarm on indicator
One-time alarm on Snooze alarm on Alarm off
•The applicable alarm on indicator is displayed in all modes when an alarm
is turned on.
•The snooze alarm on indicator flashes during the 5-minute intervals
between alarms.
•Displaying the Alarm1setting screen while the snooze alarm is turned on
automatically turns off the snooze alarm (making Alarm1a one-time alarm).
To turn the hourly time signal on and off
1. In the Alarm Mode, use Dto select the
Hourly Time Signal (:00).
2. Press Bto toggle it on and off.
•Turning on the Hourly Time Signal displays the
hourly time signal on indicator in all modes.
Hourly time signal on
indicator
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
illuminates the display automatically 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 Lto illuminate the display
for about one second.
•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 your face 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°

Operation Guide 3108
5
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 the Timekeeping Mode (except when a setting screen is on the display),
hold down Lfor about three 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 reduced significantly even if
the face is covered only partially.
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
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 charge fully, contact your dealer or CASIO distributor about having it
replaced.
•The special rechargeable (secondary) 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 this watch 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.
Function Status
All functions enabled.
All functions enabled.
Alarm, hourly time
signal, illumination and
time calibration signal
reception disabled.
All functions, including
auto light switch,
disabled.
All functions, including
timekeeping, disabled
and initialized.
Level
1
2
3
4
5
Battery Power Indicator
(Charge Soon Alert)
(Charge Soon Alert)
Battery power indicator
l
l
l
l
l
l
l
l
l
Battery Power Indicator and Recover Indicator
The battery power indicator shows you the current power level of the
rechargeable battery.
•flashes on the display in the Timekeeping Mode when battery is at
Level 3.
•at Level 3 and the flashing charge indicator (CHG) 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 (CHG)) 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.
•Leaving the watch in direct sunlight or some other very strong light source
can cause the battery power indicator to show a reading that is
momentarily higher than the actual battery level. The correct battery power
indicator should appear after a few minutes.
•If you use the illumination or alarms a number of times during a short
period, the charge indicator (CHG) flashes and the following operations
become disabled until battery power recovers.
Illumination
Beeper tone
Time calibration signal reception
After some time, battery power will recover and the charge indicator (CHG)
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
Charging Guide
After a full charge, timekeeping remains enabled for up to about nine 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.
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
5 minutes
24 minutes
48 minutes
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
•10 seconds of alarm operation per day
•10 minutes of signal reception per day
•Stable operation is promoted by frequent exposure to light.
7 hours
35 hours
71 hours
2 hours
6 hours
11 hours
120 hours
25 hours
126 hours
256 hours
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.
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 5 Level 4 Level 3 Level 2 Level 1
▲
–––
▲ ▲ ▲ ▲

Operation Guide 3108
6
Timekeeping
Use the Timekeeping Mode to set and view the current time and date.
•When setting the time, you also can configure settings for the 12/24-hour
format, and power saving on/off, and you can specify the screens that are
displayed in the Timekeeping Mode.
•In the Timekeeping Mode, you can press Bto toggle the display contents
as shown below.
Date
Month –DayHour : Minutes
PM indicator
▲
Press B.
▲
Day of week
Day of the Week
•Pressing Din the Timekeeping Mode will display the Last Signal screen.
▲
Press D.
▲
Setting the 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 set the time and date manually
1. In the Timekeeping Mode, hold down Auntil
the city code starts to flash, which indicates
the setting screen.
2. Press Cto change the flashing contents in
the sequence shown below to select other
settings.
City code
Seconds Hour
Minutes
12/24-Hour
Format
Month Year
DST
Day
Power
Saving
City Code
3. When the setting you want to change is flashing, use Band/or Dto
change it as described below.
To do this:
Change the city code
Toggle between Standard Time ( )
and Daylight Saving Time ( )
Toggle between 12-hour (12H) and
24-hour (24H) timekeeping
Do this:
Use D(east) and
B(west).
Press D.
Press D.
Screen:
BJS
Reset the seconds to
Change the hour or minutes
Change the year, month, or day
Toggle Power Saving on ( ) and off
()
Press D.
Use D(+) and
B(–).
Press D.
•See “City Code Table”for a complete list of available city codes.
•For information about Power Saving, see “Power Saving Function”.
4. Press Ato 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.
•As of July 2007, China does not use Daylight Saving Time (DST). If China
does go to the Daylight Saving Time system in the future, some functions of
this watch may no longer operate correctly.
•If you experience problems receiving the time calibration signal in your
area, it probably is best to switch between Standard Time and Daylight
Saving Time (summer time) manually.
To change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down Auntil the city code starts to flash,
which indicates the setting screen.
2. Press Cand the DST setting screen appears.
3. Press Dto toggle between Daylight Saving Time (ON displayed) and
Standard Time (OFF displayed).
4. When the setting you want is selected, press Ato exit the setting screen.
•The DST indicator appears to indicate that Daylight Saving Time is turned
on.
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.
Button Operation Tone
The button operation tone sounds any time you
press one of the watch’s buttons.You can turn the
button operation tone on or off as desired.
•Even if you turn off the button operation tone,
the alarm, Hourly Time Signal, and Countdown
Timer Mode alarm all operate normally.
To turn the button operation tone on and
off
In any mode (except when a setting screen is on
the display), hold down Cto toggle the button
operation tone on (mute indicator not displayed)
and off (mute indicator displayed).
Mute indicator
•Since the Cbutton is also the mode change button, holding it down to turn
the button operation tone on or off also causes the watch’s current mode to
change.
•The mute indicator is displayed in all modes when the button operation tone
is turned off.
Power Saving Function
When turned on, the Power Saving function
enters a sleep state automatically whenever the
watch is left in an area for a certain period where
it is dark. 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 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.
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 Power Saving
indicator (PS) flashing
Blank, with Power Saving
indicator (PS) not flashing
Operation
All functions enabled, except
for the display
Beeper tone, illumination,
and display are disabled.
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down Auntil
the city code starts to flash, which indicates
the setting screen.
2. Press Cnine times until the Power Saving
on/off screen appears.
3. Press Dto toggle Power Saving on ( ) and
off ( ).
4. Press Ato exit the setting screen.
•The Power Saving indicator (PS) 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 returns to the Timekeeping Mode automatically.
•If you leave the watch with a flashing setting on the display for two or three
minutes without performing any operation, the watch exits the setting
screen automatically.
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On/Off status

Operation Guide 3108
7
Scrolling
The Band Dbuttons 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.
Radio-controlled Atomic Timekeeping Precautions
•Strong electrostatic charge can result in the wrong time being set.
•The time calibration signal is bounced 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.
•Even if the time calibration signal is received properly, certain conditions
can cause the time setting to be off by up to one second.
•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 update the date and day of the week
automatically for the period January 1, 2000 to December 31, 2099. Setting
of the date by a 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.
•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.
•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.
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 displayed automatically 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 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 “Coordinated Universal Time”,
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
also is 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 turns off automatically 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 4.
•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 in about one second, 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
your face 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.
City Code Table
Pago Pago
Honolulu
Anchorage
Vancouver
Los Angeles
Edmonton
Denver
Mexico City
Chicago
Miami
Toronto
New York
Caracas
Halifax
St. Johns
Rio De Janeiro
Praia
City City GMT Other major cities in same time zone
Code
Differential
PPG
HNL
ANC
YVR
LAX
YEA
DEN
MEX
CHI
MIA
YTO
NYC
CCS
YHZ
YYT
RIO
RAI
–11.0
–10.0
–09.0
–08.0
–07.0
–06.0
–05.0
–04.0
–03.5
–03.0
–01.0
Papeete
Nome
San Francisco, Las Vegas,
Seattle/Tacoma, Dawson City, Tijuana
El Paso, Edmonton, Culiacan
Houston, Dallas/Fort Worth, New Orleans, Winnipeg
Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
La Paz, Santiago, Port Of Spain
Sao Paulo, Buenos Aires, Brasilia, Montevideo
Lisbon
London
Madrid
Paris
Rome
Berlin
Stockholm
Athens
Cairo
Jerusalem
Moscow
Jeddah
Tehran
Dubai
Kabul
Karachi
Delhi
+00.0
+01.0
+02.0
+03.0
+03.5
+04.0
+04.5
+05.0
+05.5
Dublin, Casablanca, Dakar, Abidjan
Milan, Amsterdam, Algiers, Hamburg, Frankfurt, Vienna
Helsinki, Istanbul, Beirut, Damascus,
Cape Town
Kuwait, Riyadh, Aden, Addis Ababa, Nairobi
Shiraz
Abu Dhabi, Muscat
Male
Mumbai, Kolkata, Colombo
LIS
LON
MAD
PA R
ROM
BER
STO
ATH
CAI
JRS
MOW
JED
THR
DXB
KBL
KHI
DEL
•Based on data as of June 2007.
Dhaka
Yangon
Bangkok
Singapore
Hong Kong
Beijing
Taipei
Seoul
Tokyo
Adelaide
Guam
Sydney
Noumea
Wellington
+06.0
+06.5
+07.0
+08.0
+09.0
+09.5
+10.0
+11.0
+12.0
Jakarta, Phnom Penh, Hanoi, Vientiane
Kuala Lumpur, Manila, Perth, Ulaanbaatar
Pyongyang
Darwin
Melbourne, Rabaul
Port Vila
Christchurch, Nadi, Nauru Island
DAC
RGN
BKK
SIN
HKG
BJS
TPE
SEL
TYO
ADL
GUM
SYD
NOU
WLG