Operation Guide 3139/3456
E-49
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 reflectivity 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.
E-48
Auto Return Features
If you leave the watch with the Last Signal screen in the Timekeeping Mode for one
or two minutes without performing any operation, it returns to the Current Time and
Date screen in the Timekeeping Mode automatically.
If you leave the watch in the Alarm Mode for two or three minutes without
performing any operation, it returns to the Timekeeping Mode automatically.
If you leave the watch with a flashing setting on the display for two or three minutes
without performing any operation, the watch exits the setting screen automatically.
Scrolling
The
B
and
D
buttons are used in various modes and setting screens to scroll
through data. In most cases, holding down these buttons during a scroll operation
scrolls through the data at high speed.
Initial Screens
When you enter the World Time or Alarm Mode, the data you were viewing when you
last exited the mode appears first.
E-47
Button Operation Tone
The button operation tone sounds any time you press one
of the watch’s buttons. You can turn the button operation
tone on or off as desired.
Even if you turn off the button operation tone, the alarm,
Hourly Time Signal, and Countdown Timer Mode alarm
all operate normally.
To turn the button operation tone on and off
In any mode (except when a setting screen is on the
display), hold down
C
to toggle the button operation tone
on (
MUTE
not displayed) and off (
MUTE
displayed).
Since the
C
button is also the mode change button, holding it down to turn the
button operation tone on or off also causes the watch’s current mode to change.
The
MUTE
indicator is displayed in all modes when the button operation tone is
turned off.
MUTE indicator
E-46
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Auto Display
Auto Display continually changes the contents of the digital display.
To turn off Auto Display
Press any button to turn off Auto Display. This returns to the Timekeeping Mode.
To turn on Auto Display
In the Timekeeping Mode (page E-6), while holding down
B
, hold down
D
for about
two seconds until the watch beeps.
Note
Calibration signal reception is disabled while Auto Display is being performed.
Auto Display cannot be performed while a setting screen is on the display.
E-45
To change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down
A
until the city code starts to flash, which
indicates the setting screen.
2. Press
C
and the DST setting screen appears.
3. Use
D
to cycle through the DST settings in the sequence shown below.
D
D
Auto DST
(
)
DST off
(
)
D
DST on
(
)
4. When the setting you want is selected, press
A
to exit the setting screen.
The DST indicator appears to indicate that Daylight Saving Time is turned on.
E-44
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
The time calibration signals transmitted from Mainflingen (Germany), Anthorn
(England), or Fort Collins (the United States) includes both Standard Time and DST
data. When the Auto DST setting is turned on, the watch switches between Standard
Time and DST (summer time) automatically in accordance with the received time
signal.
The time calibration signals transmitted from Fukushima and Fukuoka/Saga (Japan)
do not include summer time data.
The default DST setting is Auto DST (
) whenever you select
ANC
,
YVR
,
LAX
,
YEA
,
DEN
,
MEX
,
YWG
,
CHI
,
MIA
,
YTO
,
NYC
,
YHZ
,
YYT
,
LIS
,
LON
,
MAD
,
PAR
,
ROM
,
BER
,
STO
,
ATH
,
MOW
,
HKG
,
BJS
,
TPE
,
SEL
, or
TYO
as your Home
City code.
If you experience problems receiving the time calibration signal in your area, it
probably is best to switch between Standard Time and Daylight Saving Time
(summer time) manually.
E-43
See the “City Code Table” at the back of this manual for a complete list of
available city codes.
See the “Day of the Week List” at the back of this manual for information on
abbreviations used.
Auto DST (
) can be selected only while
HNL
,
ANC
,
YVR
,
LAX
,
YEA
,
DEN
,
MEX
,
YWG
,
CHI
,
MIA
,
YTO
,
NYC
,
YHZ
,
YYT
,
LIS
,
LON
,
MAD
,
PAR
,
ROM
,
BER
,
STO
,
ATH
,
MOW
,
HKG
,
BJS
,
TPE
,
SEL
, or
TYO
is selected as the
Home City code. For more information, see “Daylight Saving Time (DST)” below.
4. Press
A
to exit the setting screen.
E-42
Screen:
To do this:
Do this:
Reset the seconds to
Press
D
.
Change the hour, minutes, or year
Use
D
(+) and
B
(–).
Change the month or day
Change the language
: English
: Spanish
: French
: Portuguese
: German
: Italian
: Chinese
: Russian
: Japanese
Use
D
and
B
.
Toggle the month/day display format
between month/day (
M/D
) and day/month
(
D/M
).
Press
D
.
E-41
C
C
C
City
Code
12/24-Hour
Format
Seconds
Minutes
Hour
DST
Month/Day Display
Format
Language
Day
Month
Year
C
C
C
C
C
C
C
C
3. When the setting you want to change is flashing, use
B
and/or
D
to change it as
described below.
Screen:
To do this:
Do this:
Change the city code
Use
D
(east) and
B
(west).
Cycle between auto DST (
),
Standard Time (
), and Daylight
Saving Time (
)
Press
D
.
Toggle between 12-hour (
) and
24-hour (
) timekeeping
Press
D
.
E-40
Setting the Time and Date
Make sure you select your Home City code before you change the current time
and date settings. World Time Mode times are all displayed in accordance with the
Timekeeping Mode settings. Because of this, World Time Mode times will not be
correct if you do not select the proper Home City code before setting the time and
date in the Timekeeping Mode.
To set the time and date
1. In the Timekeeping Mode, hold down
A
until the city
code starts to flash, which indicates the setting screen.
2. Press
C
to change the flashing contents in the
sequence shown below to select other settings.
City code
