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Operation Guide 5240
E-29
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 its day setting automatically for the period from x
January 1, 2000 to December 31, 2099. Updating of the day setting 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-82).
The receive operation is disabled under any of the following conditions. x
While power is at Level 2 or lower (page E-14)
While the watch is in the power recovery mode (page E-15)
While the watch is in the function sleep state (power saving, page E-17)
While the watch is in the World Time Mode (page E-53)
While a countdown timer operation is in progress (page E-63)
A receive operation is cancelled if an alarm sounds while it is being performed. x
E-28
To turn auto receive on and off
In the Timekeeping Mode, press 1. B. The
x
Second
Hand will move to Y (YES) or N (NO) to indicate the last
calibration signal receive result.
Pull out the crown.2.
The
x
Second Hand will perform one full revolution and
then stop at the current on/off setting.
Rotate the crown to move the 3.
x
Second Hand to the
setting you want.
To turn on auto receive, select
x Y (YES).
To turn off auto receive, select x N (NO).
Push the crown back in to return to the Timekeeping 4.
Mode.

@
Y (YES)
N (NO)
E-27
Note
To interrupt a receive operation and return to the Timekeeping Mode, press any
x
button.
To check the result of the latest receive operation
In the Timekeeping Mode, press B. The
x
Second
Hand will move to Y (YES) or N (NO) to indicate the last
calibration signal receive result.
The
x
x
Second Hand will move to Y (YES) if the latest
receive operation was successful, or N (NO) if it was not.
After about 10 seconds, regular timekeeping will resume.
Press
x B to return to regular timekeeping. The watch will
also return to regular timekeeping if you do not perform
any operation for about 10 seconds.
Note
The
x
x
Second Hand will indicate N (NO) if you have adjusted the time or day
setting manually since the latest receive operation.

@
E-26
To perform manual receive
In the Timekeeping Mode (page E-33), keep 1. B depressed (for about two seconds)
as the
x
Second Hand goes through the following sequence.
Moves to x Y (YES) or N (NO) to indicate the last signal reception result, then to
R (READY).
The 2.
x
Second Hand indicates the operations the watch is currently performing.
When the x
x
Second Hand is
pointed here:
It means this:
R (READY)
Watch is setting up for reception.
W (WORK) Reception is in progress.
If signal reception is unstable, the x x
x
Second Hand may
move between W (WORK) and R (READY).
When the receive operation is successful, the watch
x
adjusts the time setting accordingly, and then resumes
regular timekeeping. It does not adjust the setting if the
operation failed.

@
E-25
What you should do next depends on whether you are using Auto Receive or 3.
Manual Receive.
Auto Receive: Leave the watch over night in the location you selected in step 2.
x
See “Auto Receive” on page E-25 for details.
Manual Receive: Perform the operation under “To perform manual receive” on
x
page E-26.
Auto Receive
With Auto Receive, the watch performs the receive operation each day
x
automatically up to six times (up to fi ve times for the Chinese calibration signal)
between the hours of midnight and 5 a.m. (according to the Timekeeping Mode
time). When any receive operation is successful, none of the other receive
operations for that day are performed.
When a calibration time is reached, the watch will perform the receive operation
x
only if it is in the Timekeeping Mode. The receive operation is not performed if a
calibration time is reached while you are confi guring settings.
E-24
Signal reception may be diffi cult or even impossible under the conditions x
described below.
Inside or
among
buildings
Inside a
vehicle
Near
household
appliances,
offi ce
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
E-23
To get ready for a receive operation
Confi rm that the watch is in the Timekeeping Mode. If it isn’t, hold down 1. C for at
least two seconds to enter the Timekeeping Mode.
Place the watch in a location where signal reception is good.2.
12 o’clock
or
Position the watch as shown in the x
nearby illustration, with 12 o’clock
pointed towards a window. Make
sure there are no metal objects
nearby.
Signal reception normally is better
x
at night.
The receive operation takes from x
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 operation or
move the watch during this time.
E-22
Signal reception may not be possible at the distances noted below during certain times x
of the year or day. Radio interference may also cause problems with reception.
Mainfl ingen (Germany) or Anthorn (England) transmitters: 500 kilometers
(310 miles)
Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)
Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles)
Shangqiu (China) transmitter: 500 kilometers (310 miles)
As of December 2010, China does not use Daylight Saving Time (DST). If China x
does go to the Daylight Saving Time system in the future, some functions of this
watch may no longer operate correctly.
Using this watch in a country covered by a time calibration signal that is different
x
from the countries it supports may result in incorrect time indication due to local
application of daylight saving time (summer time), etc.
E-21
Japanese Signals Chinese Signal
Fukushima
500 kilometers
1,000 kilometers
Fukuoka/Saga
1,500 kilometers
Changchun500 kilometers
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
E-20
Approximate Reception Ranges
UK and German Signals North American Signal
Anthorn
500 kilometers
1,500 kilometers
Mainfl ingen
The Anthorn signal is receivable
within this area.
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
3


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