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Operation Guide 3731
3
❚
To specify the illumination duration
1. In the Timekeeping Mode,
hold down the
AA
AA
A button
for about two seconds.
• This will cause the currently
selected time zone to flash on
the display, and the second
hand to move to 12 o’clock.
2. Press the
CC
CC
C button three
times to display the
flashing seconds count.
3. Press the
BB
BB
B button to
toggle the illumination
duration between about 2
seconds (● indicator) and
1.5 seconds (no indicator).
● indicator
(Appears only on
the settin
g
screen.)
4. After the setting is the way you want, press the
AA
AA
A
button to exit the setting screen.
• The second hand will move to the current time as kept
internally, and resume normal movement from there.
• The watch will also exit the setting screen automatically if you
do not perform any operation for about two or three minutes.
Time Zone
Seconds
(3 times)
What is a radio-controlled watch?
Your radio-controlled watch is designed to receive a time
calibration signal that contains standard time data, and adjust its
current time setting accordingly.
Signal data
Transmitter
Internally
Decode
Watch
Time data
Long-wave
time
calibration
signal
Cesium
atomic clock
Signal is received
using built-in antenna.
Watch decodes
received data
and converts it
to time data.
Time is adjusted
according to
time data.
After the watch receives the Standard Time signal, it performs
internal calculations to determine the current time. Because of
this, there may be an error of up to one second in the
displayed time.
Calibration Signal
• The Japanese calibration signal (Call Sign: JJY) is maintained by
the National Institute of Information and Communications
Technology (NICT). It is a long wave signal transmitted 24 hours a
day from the Mt. Otakadoya transmitter (40kHz) located in
Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane
transmitter (60kHz) located on the border between Saga
Prefecture and Fukuoka Prefecture.
Note that transmission of the time calibration signal may be
interrupted occasionally due to maintenance, lightning, etc.
How a Radio-controlled Watch Works
Location
Reception is difficult and may even be impossible in the locations
described below. Avoid such locations when performing signal
reception.
• You should think of your watch operating like a radio or TV when it
is receiving the calibration signal.
If you are experiencing problems with reception, move away
from the types of locations described above to a location with
better reception, and try again.
Near high-voltage lines
Among or near buildings
Near mountains
Inside a vehicle
(automobile, train, plane, etc.)
In a location where there is
radio interference (construction
site, airport, etc.)
Next to a household
appliance or office equipment
(TV, speaker, fax, computer,
cell phone, etc.)
Reception Range
This watch can be configured to select the strongest Japanese
signal (40kHz Mt. Otakadoya signal or 60kHz Mt. Hagane signal),
and use that one for calibration. is stronger.
1000km
Mt. Hagane
(60kHz)
Mt. Otakadoya
(40kHz)
500km
1000km
500km
Japan Transmitter
Locations
• Under optimum conditions, the calibration signal should be
receivable up to 1,000 kilometers from the transmitter. Note
that the wave is relatively weak at distances greater than
500km, so reception may be poor at long distances.
• Geographic contours, nearby buildings, seasonal conditions, the
time of day, can even make reception impossible even when you
are within range of the transmitter.
• Best reception is possible late at night.
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration
signal.
• Auto receive (Reception is performed automatically at
midnight, 1:00, 2:00, 3:00 and 4:00 each morning.)
•
Manual receive (You initiate reception using
BB
BB
B
button operation.)
• If reception is not successful for any of the normal auto receive
operations shown above, auto receive is performed one more
time at 5:00 a.m.
• The watch is set up for auto receive at the factory, so all you need to
do is to place it in a location that allows good reception each night.
❚
To position the watch for optimum reception
Remove the watch from your wrist and place it somewhere so its
top (12 o’clock side, where the antenna is located) is facing
approximately in the direction of the signal transmitter. Keep the
watch away from metal objects.
Resin band
Metal band
• Orienting the watch so it is sideways to the transmitter makes it
more difficult to receive the signal.
• Do not move the watch while it is receiving the calibration signal.
❚
Time Required for Reception
A calibration signal receive operation takes anywhere from about
two to seven minutes.
• Note that when “A” (Auto Select) is specified as the transmitter
selection mode, signal reception can take up to 14 minutes.
• See “Configuring Auto Receive Settings” for more information.
❚
To perform manual receive
In the Timekeeping Mode, hold
down the
BB
BB
B button for about
two seconds.
•
The watch will beep and reception
will start. The receive ( ) indicator
will appear on the display to indicate
reception conditions.
❚
To interrupt reception
Press the
BB
BB
B button.
• All other buttons besides B are disabled during signal reception.
When reception is successful
The watch will terminate reception and adjust the current time.
Next it will beep and then display the date and time that the
adjustment was performed.
• The receive indicator ( ) will remain on the display to indicate
that reception was successful.
• The second hand will move to the correct position in accordance
with the digital time, and resume normal movement from there.
Reception Error
The will display “ ” without adjusting the time setting when
signal reception is unsuccessful for some reason.
•
The watch will return to the Timekeeping Mode screen automatically
if you do not perform any operation for about one or two minutes.