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Operation Guide 5161
E-70
• Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
• The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch
is already in the sleep state when 6:00 AM arrives, however, it will remain in the
sleep state.
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area.
• Press any button.
Radio-controlled Atomic Timekeeping Precautions
• Strong electrostatic charge can result in the wrong time being set.
• The time calibration signal bounces 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.
E-71
• 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 manually.
• 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 the 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.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps the time with the precision noted in “Specifications”.
• 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, and DST
(summer time) settings (page E-54), and auto receive settings (page E-27).
E-72
• The Home City setting reverts to the initial default of 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-12).
Transmitters
The time calibration signal received by this watch depends on the currently selected
Home City code (page E-12).
• When a U.S. time zone is selected, the watch receives the time calibration signal
transmitted from the United States (Fort Collins).
• When a Japanese time zone is selected, the watch receives the time calibration
signal transmitted from Japan (Fukushima and Fukuoka/Saga).
• When a European time zone is selected, the watch receives the time calibration
signals transmitted from Germany (Mainflingen) and England (Anthorn).
• When a China time zone is selected, the watch receives the time calibration signals
transmitted from China (Shangqiu City).
E-73
• When your Home City is LON, PAR,ATH (which can receive both the Anthorn and
Mainflingen signals), the watch first tries to pick up the signal it last successfully
received. If that fails, it tries the other signal. For the first receive after you select your
Home City, the watch tries the nearest signal first (Anthorn for LON, Mainflingen for
PAR and ATH).
• When your Home City is TYO (which can receive both 40 kHz and 60 kHz signals),
the watch first tries to pick up the signal it last successfully received. If that fails, it
tries the other signal.
Auto Return
If you do not perform any operation for about two or three minutes while a setting
screen (with a flashing setting) is on the display, the watch will exit the setting screen
automatically.
Scrolling
The C button is used in various modes and setting screens to scroll through data on
the display. In most cases, holding down this button during a scroll operation scrolls at
high speed.
E-74
Initial Screens
When you enter the World Time Mode or Alarm Mode, the data you were viewing
when you last exited the mode appears first.
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 year can be set in the range of 2000 to 2099.
• The watch’s 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 watch’s battery replaced.
• The current time for all city codes in the Timekeeping Mode and World Time Mode is
calculated in accordance with the Coordinated Universal Time (UTC) for each city,
based on your Home City time setting.
E-75
World Time
• The seconds count of the World Time is synchronized with the seconds count of the
Timekeeping Mode.
Illumination Precautions
An LED (light-emitting diode) and a light guide panel illuminate the face of the watch
for easy reading in the dark. In any mode, press A to illuminate the face of the watch
for about one second.
• The illumination provided by the light may be difficult to see when viewed under
direct sunlight.
• Illumination turns off automatically whenever an alarm sounds.
• Frequent use of illumination shortens the battery operating time.
E-76
Specifications
Accuracy at normal temperature: ± 15 seconds a month
Digital Timekeeping: Hour, minutes, seconds, a.m./p.m. (P), day, day of the week
Time system: Switchable between 12-hour and 24-hour formats
Calendar system: Full Auto-calendar pre-programmed from the year
2000 to 2099
Other: Home City code (can be assigned one of 29 city codes); Daylight Saving
Time (summer time)/Standard Time
Analog Timekeeping: Hour, minutes (hand moves every 10 seconds), seconds
Time Calibration Signal Reception: Auto receive 6 times a day (5 times a day for the
Chinese calibration signal) (Remaining auto receives cancelled as soon as
one is successful); Manual receive
Receivable Time Calibration Signals: Mainflingen, Germany (Call Sign: DCF77,
Frequency: 77.5 kHz); Anthorn, England (Call Sign: MSF, Frequency: 60.0
kHz); Fort Collins, Colorado, the United States (Call Sign: WWVB, Frequency:
60.0 kHz); Fukushima, Japan (Call Sign: JJY, Frequency: 40.0 kHz); Fukuoka/
Saga, Japan (Call Sign: JJY, Frequency: 60.0 kHz); Shangqiu City, Henan
Province, China (Call Sign: BPC, Frequency: 68.5 kHz)
E-77
World Time: 29 cities (29 time zones)
Other: Daylight Saving Time/Standard Time
Alarms: 5 daily alarms; Hourly Time Signal
Stopwatch:
Measuring unit: 1/100 seconds
Measuring capacity: 59' 59.99''
Measuring mode: Elapsed time
Countdown Timer:
Measuring unit: 1 second
Input range: 1 minute to 100 minutes (1-minute increments)
Illumination: LED (light-emitting diode)
Other: Power Saving, Battery power indicator, Button operation tone on/off, day of the
week language selection
E-78
Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 4 months (from full charge to Level 4) under
the following conditions:
• Watch not exposed to light
• Internal timekeeping
• Display on 18 hours per day, sleep state 6 hours per day
• 1 illumination operation (1.5 second) per day
• 10 seconds of alarm operation per day
• Approximately 4 minutes of signal reception per day