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To turn the Daily Alarm and Hourly Time Signal on and off
In the Alarm Mode, press D to cycle through the on and off settings as shown below.
Alarm On Indicator/Hourly Time Signal On Indicator
Alarm On
Alarm Off
Signal On
Signal Off
• The alarm time is displayed in blue while the alarm is turned on.
Dual Time
The Dual Time Mode lets you keep track of time in a
Dual Time
different time zone.
(Hour : Minutes Seconds)
• The seconds count of the Dual Time is synchronized
with the seconds count of the Timekeeping Mode.
To set the Dual Time
1. Press C to enter the Dual Time Mode.
2. Use A, B, and D to set the Dual Time Mode time.
• Pressing B sets the Dual Time Mode to the same time
as the Timekeeping Mode.
• Each press of D (+) and A (–) changes the time
setting in 30-minute increments.
Timekeeping Mode time
Backlight
The backlight uses an EL (electro-luminescent) panel that
Auto light switch on
causes the entire display to glow for easy reading in the
indicator
dark. The watch's auto light switch automatically turns on
the backlight when you angle the watch towards your
face.
• The auto light switch must be turned on (indicated by
the auto light switch on indicator) for it to operate.
• See "Backlight Precautions" for other important
information about using the backlight.
To turn on the backlight manually
In any mode, press L to illuminate the display for about
one second.
• The above operation turns on the backlight regardless
of the current auto light switch setting.
About the Auto Light Switch
Turning on the auto light switch causes the backlight to turn on for about one second,
whenever you position your wrist as described below in any mode.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you more than 40 degrees causes the backlight to turn on.
Parallel to ground
Warning!
• Always make sure you are in a safe place whenever you are reading the
display of 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
surprise 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, hold down A for about two seconds to toggle the auto light
switch on (
displayed) and off (
not displayed).
• The auto light switch on indicator (
) is on the display in all modes while the auto
light switch 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.
Auto Display
Auto Display continually changes the contents of the
digital display.
To turn off Auto Display
Press any button (except for L) to turn off Auto Display.
To turn on Auto Display
Hold down C for about two seconds until the watch
beeps.
• Note that Auto Display cannot be performed while a
setting screen is on the display.
Auto Return Features
• After you perform any button operation in any mode (except for the Stopwatch
Mode), pressing C returns directly to the Timekeeping Mode.
• If you leave a screen with flashing digits on the display for two or three minutes
without performing any operation, the watch automatically saves any settings you
have made up to that point and exits the setting screen.
USER'S GUIDE 2490
Alarm On
Alarm Off
Signal Off
Signal On
More than 40 °
Data and Setting Scrolling
The A 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.
Timekeeping
• With the 12-hour format, the P (PM) indicator appears on the display for times in the
range of noon to 11:59 p.m. and the A (AM) 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.
• The year can be set in the range of 2000 to 2039.
• The watch's built-in full automatic calendar automatically 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.
• The current time is displayed in the lower part of the Stopwatch, Countdown Timer,
Alarm, and Dual Time screens. On these screens, the a.m. and p.m. indicators are
not shown when the watch is configured for the 12-hour timekeeping format.
Stopwatch
• You can use lap time measurement to time how long it takes to complete a specific
portion (such as a single lap) of a race.
• You can use split time measurement to time how long it takes to get from the start to
a specific point in a race.
Memory Management
Each time you press A to start a new elapsed time, lap/split operation in the
Stopwatch Mode, the watch automatically creates a new "log" in its memory. The log
remains open for data storage until you permanently close it by pressing D to clear
the stopwatch to all zeros.
• The watch has enough memory to hold up to 61 records. Since each log title screen
uses up one record of memory space, the maximum number of lap/split time records
you can store depends on how many logs there are currently in memory, as shown
below.
Number of
Logs
Memory Capacity
Currently in
Memory
1
2
61 Records
5
• The watch also calculates the cumulative total distance for all stopwatch operations
since the last time the cumulative total distance was reset. The cumulative total
does not affect memory capacity.
• If watch memory is already full when you perform a stopwatch button operation that
creates a new log, the oldest log in memory and all of its records are deleted
automatically to make room for the new log.
• If you are adding records to the only log in memory and watch memory becomes full,
adding another record causes the oldest record in the log to be deleted automatically
to make room for the new record.
• If you are adding records to a log when there are multiple logs in memory and watch
memory becomes full, adding another record causes the oldest log in memory and
all of its record to be deleted automatically to make room for new records.
How Stopwatch Data is Stored
The following table describes how data is stored when you perform the various button
operations described under "To measure times with the stopwatch".
Stopwatch Button Operation
Creates a new log: current date and distance
A Start (from all zeros)
(updated as timing progresses)
A Stop
Time measurement stops, without storing data in memory.
A Re-start
Time measurement re-starts, without storing data in memory.
D Lap/Split
Creates new record: displayed lap/split times
Creates new record: displayed lap/split times
D Clear
(
Stopwatch display is cleared to all zeros.
Backlight Precautions
• The electro-luminescent panel that provides illumination loses power after very long
use.
• The illumination provided by the backlight 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.
• The backlight automatically turns off whenever an alarm sounds.
• Frequent use of the backlight shortens the battery life.
Auto light switch precautions
• In order to protect against running down the battery, the auto light switch
automatically turns off approximately five hours after you turn it on.
• Avoid wearing the watch on the inside of your wrist. Doing so causes the auto light
switch to operate when it is not needed, which shortens battery life. If you want to
wear the watch on the inside of your wrist, turn off the auto light switch feature.
• The backlight may not light if the face of the watch is
More than 15 degrees
more than 15 degrees above or below parallel. Make
too high
sure that the back of your hand is parallel to the ground.
• The backlight 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 the backlight does not light, try moving the watch back to the starting
position (parallel with the ground) and then tilt it back toward you again. If this does
not work, drop your arm all the way down so it hangs at your side, and then bring it
back up again.
• Under certain conditions, the backlight may not light until about one second after
you turn the face of the watch towards you. This does not necessarily indicate
malfunction of the backlight.
Lap/Split Time Record Capacity
61 records – 1 log title screen = 60
61 records – 2 log title screens = 59
61 records – 5 log title screens = 56
Data Store Operation
)
3
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