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Operation Guide 3139
5
Radio-controlled Atomic Timekeeping Precautions
The display of the watch is blank while an auto receive operation is in progress.
Strong electrostatic charge can result in the wrong time being set.
The time calibration signal is bounced off the ionosphere. Because of this, such
factors as changes in the re ectivity of the ionosphere, as well as movement of the
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of
day may change the reception range of the signal and make reception temporarily
impossible.
Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
The current time setting in accordance with the time calibration signal takes priority
over any time settings you make.
The watch is designed to update the date and day of the week automatically for
the period January 1, 2000 to December 31, 2099. Setting of the date by a time
calibration signal cannot be performed starting from January 1, 2100.
This watch can receive signals that differentiate between leap years and non-leap
years.
Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.
Normally, the signal reception date shown by the Last Signal screen is the date data
included in the received time calibration signal. When only time data is received,
however, the Last Signal screen shows the date as kept in the Timekeeping Mode at
the time of signal reception.
If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time with the precision noted in Speci cations.
If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your current city code, DST (summer
time), and auto receive settings. The following are the initial factory defaults for
these settings.
Setting Initial Factory Default
City code
(
Tokyo
)
DST (summer time) (Auto switching)
Auto receive (Auto receive)
The watchs Home City code setting will change automatically to TYO (Tokyo)
whenever the battery goes dead or is replaced. TYO (Tokyo) causes the watch to
receive the time calibration signals of Japan. If you are using the watch in North
America or Europe, you will need to change the Home City code setting to match
your location after having the watchs battery replaced.
Timekeeping
Resetting the seconds to 00 while the current count is in the range of 30 to 59
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to 00 without changing the minutes.
The day of the week is displayed automatically in accordance with the date (year,
month, and day) settings.
The year can be set in the range of 2000 to 2099.
The watchs built-in full automatic calendar 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 watchs battery replaced.
The times for the Timekeeping Mode and all the city codes of the World Time Mode
are calculated in accordance with each citys UTC offset.
The UTC offset is a value that indicates the time difference between a reference
point in Greenwich, England and the time zone where a city is located.
The letters UTC is the abbreviation for Coordinated Universal Time, which is the
world-wide scienti c standard of timekeeping. It is based upon carefully maintained
atomic (cesium) clocks that keep time accurately to within microseconds. Leap
seconds are added or subtracted as necessary to keep UTC in sync with the Earths
rotation.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also
applied in all other modes
.
With the 12-hour format, the PM indicator (P) appears on the display for times in
the range of noon to 11:59 p.m. and no 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.
Illumination
This watch has an EL (electro-luminescent) panel that causes the entire display to
glow for easy reading in the dark. In any mode (except when a setting screen is on the
display), press
B
to illuminate the display for about three seconds
.
Illumination Precautions
The electro-luminescent panel that provides illumination loses power after very long
use.
Illumination 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.
Illumination turns off automatically whenever an alarm sounds.
Frequent use of illumination runs down the battery.
Based on data as of March 2008.
The rules governing global times (GMT differential and UTC offset) and summer time are determined by
each individual country.
* In December 2007, Venezuela changed its offset from 4.0 to 4.5. Note, however, that this watch
displays an offset of 4.0 (the old offset) for the CCS (Caracas, Venezuela) city code.
Pago Pago
Honolulu
Anchorage
Vancouver
Los Angeles
Edmonton
Denver
Mexico City
Winnipeg
Chicago
Miami
Toronto
New York
Caracas
Halifax
St. Johns
Rio De Janeiro
Praia
Lisbon
London
Madrid
Paris
Rome
Berlin
Stockholm
Athens
Cairo
Jerusalem
Moscow
Jeddah
Tehran
Dubai
Kabul
Karachi
Delhi
Dhaka
Yangon
Bangkok
Hong Kong
Beijing
Taipei
Seoul
Tokyo
Adelaide
Guam
Sydney
Noumea
Wellington
11.0
10.0
09.0
08.0
07.0
06.0
05.0
04.0
03.5
03.0
01.0
+00.0
+01.0
+02.0
+03.0
+03.5
+04.0
+04.5
+05.0
+05.5
+06.0
+06.5
+07.0
+08.0
+09.0
+09.5
+10.0
+11.0
+12.0
Papeete
Nome
San Francisco, Las Vegas,
Seattle/Tacoma, Dawson City
El Paso
Houston, Dallas/Fort Worth, New Orleans
Montreal, Detroit, Boston,
Panama City, Havana, Lima, Bogota
La Paz, Santiago, Port Of Spain
Sao Paulo, Buenos Aires, Brasilia, Montevideo
Dublin, Casablanca, Dakar, Abidjan
Milan, Amsterdam, Algiers, Hamburg, Frankfurt, Vienna
Helsinki, Istanbul, Beirut, Damascus,
Cape Town
Kuwait, Riyadh, Aden, Addis Ababa, Nairobi
Shiraz
Abu Dhabi, Muscat
Male
Mumbai, Kolkata, Colombo
Jakarta, Phnom Penh, Hanoi, Vientiane
Singapore, Kuala Lumpur, Manila, Perth, Ulaanbaatar
Pyongyang
Darwin
Melbourne, Rabaul
Port Vila
Christchurch, Nadi, Nauru Island
PPG
HNL
ANC
YVR
LAX
YEA
DEN
MEX
YWG
CHI
MIA
YTO
NYC
CCS*
YHZ
YYT
RIO
RAI
LIS
LON
MAD
PAR
ROM
BER
STO
ATH
CAI
JRS
MOW
JED
THR
DXB
KBL
KHI
DEL
DAC
RGN
BKK
HKG
BJS
TPE
SEL
TYO
ADL
GUM
SYD
NOU
WLG
City
City
UTC
Other major cities in same time zone
Code Differential
City Code Table
Day of the Week List
3UNDAY
%.'
%30
&2!
0/2
$%5
)4!
#(.
*0.
-ONDAY
4UE SD AY
7EDNESDAY
4HURSDAY &RIDAY 3ATURDAY
35. -/.
45% 7%$ 4(5 &2) 3!4
$/- ,5.
-!2 -)% *5% 6)% 3!"
$)- ,5.
-!2 -%2 *%5 6%. 3!-
$/- 3%'
4%2 15! 15) 3%8 3!"
3/. -/.
$)% -)4 $/. &2% 3!-
$/- ,5.
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5


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