Operation Guide 4749
Power Supply
This watch is equipped with a solar cell and a special rechargeable battery (secondary battery) that is charged by the electrical power produced by the solar cell. The illustration shown below shows how you should position the watch for charging.
Example: Orient the watch so its face is | Solar cell |
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pointing at a light source. |
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• The illustration shows how to position |
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a watch with a resin band. |
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• Note that charging efficiency drops |
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when any part of the solar cell is | 3 |
| 0 |
blocked by clothing, etc.
•You should try to keep the watch outside of your sleeve as much as possible. Even if the face of the watch is blocked from light only partially, charging will be reduced significantly.
Important!
•Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is blocked from exposure to light can cause rechargeable battery power to run down. Make sure that the watch is exposed to bright light whenever possible.
•This watch uses a special rechargeable battery to store power produced by the solar cell, so regular battery replacement is not required. However, after very long use, the rechargeable battery may lose its ability to achieve a full charge. If you experience problems getting the special rechargeable battery to charge fully, contact your dealer or CASIO distributor about having it replaced.
•Never try to remove or replace the watch’s special battery yourself. Use of the wrong type of battery can damage the watch.
•The current time and all other settings return to their initial factory defaults whenever battery power drops to Level 3 and when you have the battery replaced.
•Keep the watch in an area normally exposed to bright light when storing it for long periods. This helps to keep the rechargeable battery from going dead.
Battery Power Levels
The movement of the analog hands indicates the current battery power level.
Level | Hand Movement | Function Status |
1 | Normal. | All functions enabled. |
30 | •Second hand jumps |
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2 | All functions disabled, | |
| every 2 seconds. | except for analog |
| •Date changes to home | timekeeping and |
| position. | stopwatch. |
3 | •Second hand stopped. | All functions disabled. |
| •Hour and minute hands |
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| stopped at 12 o’clock. |
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Jumps 2 seconds
•The second hand jumping every two seconds (Level 2) indicates that battery power is quite low. Expose the watch to light as soon as possible to charge the battery.
•When battery power is at Level 2, time calibration signal reception is disabled.
•Alarm operation can cause hand movement to stop due to the sudden temporary drop in battery power. This does not indicate malfunction, and normal operation will resume when the watch is exposed to light. Though hand movement stops, timekeeping continues internally, and the hands will be adjusted to the correct setting when normal operation returns.
•At Level 3, all functions are disabled and settings return to their initial factory defaults. The watch will continue to keep time internally for about one month after the battery drops to Level 3. If you recharge the battery sufficiently during this period, the analog hands will move automatically to the correct setting and normal timekeeping will resume.
•Internal timekeeping will stop and the Home City setting will change to Tokyo (TYO) automatically if you leave the watch in the dark for about one month after the battery level drops to Level 3. 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 3.
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.
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 five 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) | 8 minutes |
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Sunlight through a window (10,000 lux) | 30 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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•Since these are the specs, we can include all the technical details.
•Watch is not exposed to light
•Internal timekeeping
•Analog hands operational 18 hours per day, sleep state 6 hours per day
•10 seconds of alarm operation per day
•1 time calibration reception per day
•Stable operation is promoted by frequent charging.
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) |
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Level 3 |
| Level 2 |
| Level 1 | |
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| ▲ |
| ▲ |
| ▲ |
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Outdoor sunlight (50,000 lux) | 1 hour |
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| 20 hours | |
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Sunlight through a window | 2 hours |
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| 76 hours | |
(10,000 lux) |
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Daylight through a window on | 4 hours |
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| – – – | |
a cloudy day (5,000 lux) |
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Indoor fluorescent lighting | 37 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.
Auto Return Features
•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 do not perform any operation for about two or three minutes while a setting mode is selected, the watch will exit the setting mode automatically.
Scrolling
•The Dand Bbutton are used to change the hand setting in various setting modes. In most cases, holding down these buttons will start
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–One complete cycle for the hands is one revolution (360 degrees) or 24 hours.
–One complete cycle for the day is 31 days.
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 update the date and day of the week automatically for the period January 1, 2001 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.
•If you are in an area where proper time calibration signal reception is impossible, the watch keeps time within ±20 seconds a month at normal temperature.
Tidal Movements
Tides are the periodic rise and fall of the water of oceans, seas, bays, and other bodies of water caused mainly by the gravitational interactions between the Earth, Moon and Sun. Tides rise and fall about every six hours. The Tide Graph of this watch indicates tidal movement based on the Moon’s transit over a meridian and the lunitidal interval. The Tide Graph calculates and graphically represents current tide conditions in your Home City or a port city in the vicinity of the Home City based on longitudes, lunar day length, and lunitidal interval preset in watch memory, and on high tide times specified by you.
Lunitidal Interval
Theoretically, high tide is at the Moon’s transit over the meridian and low tide is about six hours later. Actual high tide occurs somewhat later, due to factors such as viscosity, friction, and underwater topography. Both the time differential between the Moon’s transit over the meridian until high tide and the time differential between the Moon’s transit over the meridian until low tide are known as the “lunitidal interval”. For information about the lunitidal intervals for each city code, see “Lunitidal Intervals for Each City”.
Timekeeping
•The year can be set in the range of 2001 to 2099.
•The watch’s
•The date will change automatically when the current time reaches midnight. The date change at the end of the month may take more time than normal.
•The current time for all city codes in the Timekeeping Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential of each city, based on your Home City time setting.
•GMT differential is calculated by this watch based on Universal Time Coordinated (UTC*) data.
*UTC is the
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