Operation Guide 2639 2819
Warning!
•Always make sure you are in a safe place whenever you are reading the display of the watch using the auto light switch. Be especially careful when running or engaged in any other activity that can result in accident or injury. Also take care that sudden illumination by the auto light switch does not startle or distract others around you.
•When you are wearing the watch, make sure that its auto light switch is turned off before riding on a bicycle or operating a motorcycle or any other motor vehicle. Sudden and unintended operation of the auto light switch can create a distraction, which can result in a traffic accident and serious personal injury.
To turn the auto light switch on and off
In any mode, hold down L for about two seconds to toggle the auto light switch on (auto light switch on indicator displayed) or off (auto light switch on indicator not displayed).
•The auto light switch on indicator is displayed in all modes while the auto light switch is turned on.
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 | Solar cell |
is pointing at a light source. |
|
• The illustration shows how to position |
|
a watch with a resin band. |
|
• Note that charging efficiency drops |
|
when any part of the solar cell is |
|
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 only partially blocked from light, |
|
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 normally 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 fully charge, 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 4 and when you have the battery replaced.
•Turn on the watch’s Power Saving function and keep it 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 Indicator
The battery power indicator on the display shows you the current status of the rechargeable battery’s power.
| Level | Battery Power Indicator | Function Status |
| 1 | Module 2639 Module 2819 | All functions enabled. |
Module 2639 | 2 |
| All functions enabled. |
Battery power | 3 |
| Beeper tone, backlight, calibration |
indicator |
| ||
|
|
| signal reception, display, and |
|
|
| buttons are disabled. |
|
| Charge Soon Alert |
|
| 4 |
| All functions, including |
Module 2819 |
|
| timekeeping, are disabled. |
|
|
|
•The Level 3 charge warning indicator tells you that battery power is very low, and that exposure to bright light for charging is required as soon as possible.
•At Level 4, all functions are disabled and settings return to their initial factory defaults. Functions are enabled once again after the rechargeable battery is charged, but you need to set the time and date after the battery reaches Level 3 from Level 4. You will not be able to configure any of the other settings until the battery reaches Level 2 after dropping to Level 4.
•The Home City reverts to TYO (Tokyo), which means that the watch is configured to receive the Japanese time calibration signal, whenever battery power drops to Level 4. If you are using the watch in North America, you will need to configure your Home City code setting whenever battery power recovers after dropping to Level 4.
•Leaving the watch in direct sunlight or some other very strong light source can cause the battery power indicator to temporarily show a reading that is actually higher than the battery level. The correct battery power indicator should appear after a few minutes.
•If you use the backlight or the alarms a number of times during a short period, the recover indicator (RECOVER / RECOV) appears on the display and the following operations become disabled until battery power recovers.
Backlight Beeper tone Calibration reception
After some time, battery power will recover and the recover indicator (RECOVER / RECOV) will disappear, indicating that the above functions are 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 six 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 |
Outdoor Sunlight (50,000 lux) | 5 minutes |
Sunlight Through a Window (10,000 lux) | 24 minutes |
Daylight Through a Window on a Cloudy Day (5,000 lux) | 48 minutes |
Indoor Fluorescent Lighting (500 lux) | 8 hours |
•Since these are the specs, we can include all the technical details.
•Watch is not exposed to light
•Display on 18 hours per day, sleep state 6 hours per day
•1 backlight operation (1.5 seconds) per day
•10 seconds of alarm operation per day
•4 times 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 |
|
| ||||||
(Brightness) | Level 4 |
| Level 3 | Level 2 |
| Level 1 | |||
|
|
|
| ▲ |
| ▲ |
|
| ▲ |
|
|
|
|
|
|
| |||
Outdoor Sunlight | 1 hour |
|
| 14 hours |
| 3 hours | |||
(50,000 lux) |
|
|
|
|
|
|
|
|
|
Sunlight Through a | 3 hours |
|
| 70 hours |
| 14 hours | |||
Window (10,000 lux) |
|
|
|
|
|
|
|
|
|
Daylight Through a | 5 hours |
|
| 143 hours |
| 28 hours | |||
Window on a Cloudy |
|
|
|
|
|
|
|
|
|
Day (5,000 lux) |
|
|
|
|
|
|
|
|
|
Indoor Fluorescent | 57 hours |
|
|
|
|
| |||
Lighting (500 lux) |
|
|
|
|
|
|
|
|
|
•The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.
Timekeeping
Use the Timekeeping Mode to set and view the current time and date. This section also explains how to set the current date and time manually.
•The watch is equipped with a Time Recorder feature that lets you record the current Home City time (month, day, hour, minutes, seconds, and DST on/off setting) with the touch of a button. See “To record a Time Recorder time” for more information.
•All of the operations in this section are performed in the Timekeeping Mode, which you can enter by pressing C.
PM | Day of week | Receive time |
indicator |
|
|
| Press D. | |
| ▲ | ▲ |
| Month – Day | Receive date |
| Hour : Minutes Seconds | Last Signal Screen |
|
| |
Setting the Time and Date Manually
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 current time and date manually
1.In the Timekeeping Mode, hold down Auntil the transmitter indicator starts to flash, which indicates the setting screen.
2.Use A or Cto move the flashing in the sequence shown below to select other settings.
Transmitter indicator
Transmitter/ |
|
|
| Press C. |
| / Press A. |
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
| |||||||||||
|
|
| C |
|
|
|
|
|
|
|
|
|
|
|
| ||||
City Settings |
| Transmitter |
|
| City Code |
|
| DST |
|
|
| Auto |
| ||||||
|
|
|
|
|
|
|
|
|
|
| Receive |
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
| A |
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
Time/Date/ |
|
|
| C |
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
Power Saving |
|
| Format |
|
|
| Seconds |
|
|
| Hour |
|
|
| Minutes |
| |||
Settings |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Power |
|
|
| Day |
|
|
|
| Month |
|
|
| Year |
| |
|
|
|
| Saving |
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
4