Operation Guide 5230
E-39
Countdown Timer Mode
C
Alarm Mode
Stopwatch Mode
C
C
E-38
Selecting a Mode
The illustration below shows which buttons you need to press to navigate between
x
modes.
To return to the Timekeeping Mode from any other mode, hold down
x
C
for at
least four seconds.
Timekeeping Mode
World Time Mode
C
C
E-37
Mode Reference Guide
Your watch has “fi ve modes”. The mode you should select depends on what you
want to do.
To do this:
Enter this mode:
See:
View the current date in the Home City
x
Confi gure Home City and daylight saving time (DST)
x
settings
Confi gure time and date settings manually
x
Perform a time calibration receive operation
x
Check whether the last receive operation was successful
x
Switch between 12-hour and 24-hour timekeeping
x
Display an alarm countdown
x
Timekeeping Mode
E-41
View the current time in one of 48 cities (31 time zones)
around the globe
World Time Mode
E-53
Use the stopwatch to measure elapsed time
Stopwatch Mode
E-57
Use the countdown timer
Countdown Timer Mode
E-60
Set an alarm time
Alarm Mode
E-63
E-36
The receive operation is disabled under any of the following conditions.
x
While power is at Level 3 (
−
L
) or lower (page E-15)
While the watch is in the power recovery mode (page E-17)
−
When the watch is in the function sleep state (“Power Saving”, page E-19)
−
While a countdown timer operation is in progress (page E-60)
−
While the hands are in positions to allow easier viewing of the digital dials (page
−
E-79)
A receive operation is cancelled if an alarm sounds while it is being performed.
x
The Home City setting reverts to the initial default of
x
TYO
(Tokyo) whenever the
battery power level drops to Level 5 or when you have the rechargeable battery
replaced. If this happens, change the Home City to the setting you want (page
E-42).
E-35
Press
4.
A
to exit the setting mode.
Exiting a setting mode will normally cause the hands to return to regular
x
timekeeping automatically. However, if you manually move the hands (page
E-79) and then enter a setting mode, they will not return to regular timekeeping
automatically when you exit the setting mode. In this case, you will need to
return the hands to their normal positions manually (page E-80).
Radio-controlled Atomic Timekeeping Precautions
Strong electrostatic charge can result in the wrong time setting.
x
Even if a receive operation is successful, certain conditions can cause the time
x
setting to be off by up to one second.
The watch is designed to update the date and day of the week automatically for
x
the period January 1, 2000 to December 31, 2099. Updating of the date by signal
reception will no longer be performed starting from January 1, 2100.
If you are in an area where signal reception is not possible, the watch keeps time
x
with the precision noted in “Specifi cations” (page E-92).
E-34
To turn auto receive on and off
In the Timekeeping Mode, press
1.
D
(page E-41).
Hold down
2.
A
until the current auto receive setting (
On
or
OFF
) and RCVD indicator start to fl ash. This is the
setting mode.
Whenever you enter the setting mode, the analog
x
hands will automatically move to positions that allow
easier viewing of the digital dials.
Note that the watch will not enter the setting mode if
x
the currently selected Home City is one that does not
support time calibration reception.
Press
3.
D
to toggle between auto receive on (
On
) and
off (
OFF
).
RCVD indicator
On/Off status
E-33
To check the latest signal reception results
In the Timekeeping Mode, press
D
(page E-41).
When receive is successful, the left digital dial shows
x
the time and date that receive was successful.
- : - -
indicates that none of the receive operations were
successful.
To return to the Timekeeping Mode, press
x
D
.
Note
RCVD will not be displayed in the right digital dial if you
have adjusted the time or date setting manually since the
last receive operation.
E-32
Signal Level Indicator
During manual receive, the lower digital dial shows a
signal level indicator as shown below.
Weak
(Unstable)
Strong
(Stable)
As you watch the indicator, keep the watch in a location
that best maintains stable reception.
Even under optimum reception conditions, it can take
x
about 10 seconds for reception to stabilize.
Note that weather, the time of day, surroundings, and
x
other factors all can affect reception.
Signal level indicator
E-31
If the current reception fails but a previous reception
x
(within the last 24 hours) was successful, the right
digital dial will show RCVD and
ERR
. If only
ERR
is displayed (without RCVD), it means that all of
the receive operations over the past 24 hours have
failed. The watch will return to the Timekeeping Mode
without changing the time setting if you press
D
or
if you do not perform any button operation for about
one or two minutes.
Note
To interrupt a receive operation and return to the
Timekeeping Mode, press any button.
If there was a previously
successful reception
Receive failed
E-30
If the receive operation is successful, the reception
x
date and time appear in the left digital dial. The watch
will return to the Timekeeping Mode if you press
D
or
if you do not perform any button operation for about
one or two minutes.
Receive successful