Operation Guide 4739
•Leaving the watch in direct sunlight or some other very strong light source can cause the battery level indicator to show a reading that is momentarily higher than the actual battery level. The correct battery level indicator should appear after a few minutes.
•The watch’s Home City code setting will change automatically to TYO (Tokyo) whenever the battery drops to Level 5. With this Home City code setting, the watch is configured 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 whenever the battery drops to Level 5.
•If you use the illumination or alarms a number of times during a short period, the hands of the watch will stop. Battery level indicator will show R at this time. Also, the following operations will become disabled until battery power recovers.
Illumination Beeper tone
Time calibration signal reception
After some time, battery power will recover and the above functions will be enabled again.
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leaving the watch in the areas described below whenever charging its rechargeable battery. Also note that allowing the watch to become very hot can cause its liquid crystal display to black out. The appearance of the LCD should become normal again when the watch returns to a lower temperature.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it to become quite hot. Take care when handling the watch to avoid burn injury. The watch can become particularly hot when exposed to the following conditions for long periods.
•On the dashboard of a car parked in direct sunlight
•Too close to an incandescent lamp
•Under direct sunlight
Charging Guide
After a full charge, timekeeping remains enabled for up to about 12 months.
•The following table shows the amount of time the watch needs to be exposed to light each day in order to generate enough power for normal daily operations.
Exposure Level (Brightness) | Approximate Exposure Time |
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Outdoor Sunlight (50,000 lux) | 5 minutes |
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Sunlight Through a Window (10,000 lux) | 24 minutes |
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Daylight Through a Window on a Cloudy Day | 48 minutes |
(5,000 lux) |
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Indoor Fluorescent Lighting (500 lux) | 8 hours |
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•For details about the battery operating time and daily operating conditions, see the “Power Supply” section of the Specifications.
•Stable operation is promoted by frequent exposure to light.
Recovery Times
The table below shows the amount exposure that is required to take the battery from one level to the next.
Exposure Level | Approximate Exposure Time |
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(Brightness) | Level 5 | Level 4 | Level 3 | Level 2 | Level 1 | |
| ▲ | ▲ | ▲ | ▲ |
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Outdoor Sunlight (50,000 lux) |
| 2 hours |
| 32 hours | 9 hours | |
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Sunlight Through a Window |
| 7 hours |
| 158 hours | 44 hours | |
(10,000 lux) |
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Daylight Through a Window on |
| 13 hours |
| 321 hours | 89 hours | |
a Cloudy Day (5,000 lux) |
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Indoor Fluorescent Lighting |
| 163 hours |
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(500 lux) |
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•The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.
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.
Power Saving Function
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| When turned on, the Power Saving function enters a sleep | |
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| state automatically whenever the watch is left in an area | |
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| where it is dark for a certain period. The table below | |
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| shows how watch functions are affected by the Power | |
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| Saving function. |
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Power saving indicator |
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Elapsed Time |
| Display | Operation | |
in Dark |
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60 to 70 minutes |
| Blank, with Power Saving | All functions enabled, except | |
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| indicator (PS) flashing | for the display |
6 or 7 days |
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| Blank, with Power Saving | •Beeper tone, illumination, and |
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| indicator (PS) not flashing | display disabled |
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| •Analog timekeeping stopped |
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| at 12 o’clock |
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| •Auto receive disabled |
•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
•Press any button.
To turn Power Saving on and off
On/Off status |
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| 1. In the Timekeeping Mode, hold down Auntil the city | ||
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| code starts to flash, which indicates the setting screen. | |||
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| 2. Press C nine times until the Power Saving on/off | ||
ll | l l | l | screen appears. | ||
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| ll | l l | 3. Press D to toggle Power Saving on (PSON) and off | ||
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| l | (PSOF). |
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| l | 4. Press A to exit the setting screen. |
| l | • The Power Saving indicator (PS) is on the display in all | |||
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modes while Power Saving is turned on.
Auto Return Features
•If you leave the watch in the Alarm or Hand Setting Mode, or with the battery level indicator displayed for two or three minutes without performing any operation, it automatically returns to the Timekeeping Mode.
•If you leave the watch with a flashing setting on the display for two or three minutes without performing any operation, the watch automatically exits the setting screen.
Scrolling
The B and Dbuttons are used in various modes and setting screens to scroll through data on the display. 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 Mode, the data you were viewing when you last exited the mode appears first.
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.
•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 automatically update the date and day of the week 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
•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 “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, DST (summer time), and auto receive settings.
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 automatically displayed in accordance with the date (year, month, and day) settings.
•The year can be set in the range of 2000 to 2099.
•The watch’s
•The current time for all city codes in the Timekeeping Mode and World Time Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential for each city, based on your Home City time setting.
•The times for the Timekeeping Mode and all the city codes of the World Time Mode are calculated in accordance with each city’s UTC differential.
•The UTC differential 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 “Universal Time Coordinated”, which is the
12-hour/24-hour Timekeeping Formats
The
•With the
•With the
Illumination Precautions
•Illumination may be hard to see when viewed under direct sunlight.
•Illumination automatically turns off whenever an alarm sounds.
•Frequent use of illumination runs down the battery.
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