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Operation Guide 4378 4379
2
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to seven minutes, but in some
cases it can take as long as 14 minutes. Take care that you do not perform any
button operations or move the watch during this time.
• At distances further than about 500 kilometers from a transmitter, signal reception
may not be possible during certain times of year or times of day. Radio interference
may also cause problems with reception.
Reception Ranges
Rugby
Mainflingen
1,500 kilometers
500 kilometers
• 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.
• See the information under “Signal Reception Troubleshooting” if you experience
problems with time calibration signal reception.
About 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. The start times of the auto receive operations depend
on the current Home City and DST settings.
Home City
Auto Receive Start Times
123456
LON
PAR
BER
ATH
Standard Time
Daylight Saving
Time
Standard Time
Daylight Saving
Time
Standard Time
Daylight Saving
Time
1:00 am
2:00 am
2:00 am
3:00 am
3:00 am
4:00 am
2:00 am
3:00 am
3:00 am
4:00 am
4:00 am
5:00 am
3:00 am
4:00 am
4:00 am
5:00 am
5:00 am
Midnight
4:00 am
5:00 am
5:00 am
Midnight
Midnight
1:00 am
next day
5:00 am
Midnight
Midnight
1:00 am
next day
1:00 am
next day
2:00 am
next day
Midnight
1:00 am
next day
1:00 am
next day
2:00 am
next day
2:00 am
next day
3:00 am
next day
Note
• Auto receive is performed only if the watch is in the Timekeeping Mode or World
Time Mode when one of the calibration times is reached. It is not performed if a
calibration time is reached while an alarm is sounding, or while you are configuring
settings (while settings are flashing on the display).
• When a reception starts, the second hand will move at high speed to the 12 o’clock
position where it will stop until the reception is complete.
• 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 easily receive the signal.
• When auto receive is turned on, the watch receives the calibration signal for two to
seven minutes everyday when the time in the Timekeeping Mode reaches each of
the calibration times. Do not perform any button operation within seven minutes
before or after any one of the calibration times. Doing so can interfere with correct
calibration.
• Remember that reception of the calibration signal depends on the time kept 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
Timekeeping Mode time actually is the correct time.
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.
• 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.
• Use the receiving indicator as a guide for checking signal strength and for finding the
best location for the watch during signal reception.
Receiving indicator
Weak
(Level 1)
Strong
(Level 4)
• The Level 4 receiving indicator indicates that at least one of the auto calibration
signal receive operation was successful. Note, however, that the Level 4 receiving
indicator is cleared from the display when the first auto receive operation of the day
is performed.
• The Level 4 receiving indicator appears on the Timekeeping Mode’s Receiving
Indicator and Seconds Count screen only. The Level 4 receiving indicator is not
displayed if signal reception was unsuccessful or after manual adjustment of the
current time setting.
To perform manual receive
1.Place the watch on a stable surface so its top (12
o’clock side) is facing towards a window.
2.In the Timekeeping Mode, hold down D for about two
seconds until the watch beeps.
3.Release D and RC flashes to indicate that signal
reception has started.
• When a reception starts, the second hand will move at
high speed to the 12 o’clock position where it will stop
until the reception is complete.
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Receiving indicator
• Time calibration signal reception normally takes from two to seven minutes, but in
some cases it can take as long as 14 minutes. Take care that you do not perform any
button operations or move the watch during this time.
• After signal reception is complete, the display of the watch changes to the last signal
screen.
Note
• To interrupt a reception and return to the Timekeeping Mode, press D.
• If the reception is unsuccessful, the message
ERR appears on the display for about
one or two minutes. After that, the watch returns to the Timekeeping Mode.
• You can also change from the last signal or
ERR screen to the normal timekeeping
screen by pressing D.
To turn auto receive on and off
1.In the Timekeeping Mode, press D to display the Last
Signal screen.
2.Hold down A until the current auto receive setting (
ON
or
OF
) starts to flash. This is the setting screen.
• The second hand will move at high speed to the 12
o’clock position, where it will stop.
• 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 D to toggle auto receive on (
ON
) and off (
OF
).
4.Press A to exit the setting screen.
• The second hand will advance at high speed to the correct position in accordance
with the digital time seconds count, and resume normal movement from there.
• For information about city codes that support signal reception, see “To set your
Home City”.
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On/Off status
Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal reception.
Problem
Cannot perform
manual receive.
Auto receive is
turned on, but
the Level 4
receiving
indicator does
not appear on
the Timekeeping
Mode display.
Probable Cause
•
The watch is not in the Timekeeping Mode.
• Your current Home City is not one of the
following city codes: ATH, BER, PAR, or
LON.
• You changed the time setting manually.
• The watch was not in the Timekeeping
or World Time Mode, or you were
performing some button operation
during auto receive.
• Even if reception is successful, the
Level 4 receiving indicator disappears
each day when the first auto receive
operation of the day is performed.
• Time data (hour, minutes, seconds) only
was received during the last reception.
The Level 4 receiving indicator appears
only when time data and date data
(year, month, day) are both received.
• If the time is one hour off, the DST
setting may be incorrect.
• 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 AT H, BER, PAR, or
LON as your Home City.
• Perform manual receive or
wait until the next auto
receive is performed.
• Check to make sure the
watch is in a location where it
can receive the signal.
• Change the DST setting to
Auto DST .
• Select the correct Home City
code.
• For further information, see “Important!” under “Time Calibration Signal Reception”
and “Radio-controlled Timekeeping Precautions”.
Time setting is
incorrect
following signal
reception.
World Time
The World Time Mode digitally displays the current time in
30 cities (29 time zones) around the world.
• Pressing A in the World Time Mode causes the
applicable city code to appear on the digital display for
about two seconds.
• 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.
• All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C.
City Code
Current time in the
selected city code
To view the time in another city
While in the World Time Mode, press D to scroll through the city codes (time zones).
• For full information on city codes, see “City Code Table”.
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.
• Pressing A in the World Time Mode causes the
applicable city code to appear on the digital display for
about two seconds.
2.Hold down A to toggle Daylight Saving Time (DST
indicator displayed) and Standard Time (DST indicator
not displayed).
• 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.
DST indicator
• The DST indicator will appear on the display whenever you display a city code for
which Daylight Saving Time is turned on.
• Note that you cannot switch between Standard Time and Daylight Saving Time while
GMT is selected as the city code.
• Note that the DST/Standard Time setting affects only the currently displayed city
code. Other city codes are not affected.