Operation Guide 3725 3726
To turn the auto light switch on and off
In any mode, hold down Lfor about two seconds to toggle the auto light switch on (auto light switch indicator displayed) and off (auto light switch indicator not displayed).
•The auto light switch is automatically turned off whenever battery power is at Level 4. After battery power recovers to Level 2, you will have to perform the above procedure to turn the auto light switch back on again.
•The auto light switch indicator remains in all modes while the auto light switch is turned on.
Power Supply
This watch is equipped with a solar cell and special rechargeable batteries (secondary batteries) that are 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 pointing at a light source. | Solar cell |
• 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
when any part of the solar cell is blocked by clothing, etc.
•Normally, you should try to keep the
watch outside of your sleeve as much as possible. Charging is significantly reduced if the face is only partially covered.
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 special rechargeable batteries to store power produced by the solar cell, so regular battery replacement is not required. However, after very long use, the rechargeable batteries may lose its ability to achieve a full charge. If you experience problems getting the special rechargeable batteries to fully charge, contact your dealer or CASIO distributor about having them replaced.
•Never try to remove or replace the watch’s special batteries yourself. Use of the wrong type of batteries can damage the watch.
•All data stored in memory is deleted, and the current time and all other settings return to their initial factory defaults whenever battery power drops to Level 4 and if you should ever need to have the rechargeable batteries 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 batteries from going dead.
Battery Power Indicator and Recover Indicator
The battery power indicator shows you the current power level of the rechargeable batteries.
Level | Battery Power | Function Status | |||
Recover indicator | Indicator |
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| lll | Auto and manual receive, | ||
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| l | illumination, auto light switch, |
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| l l | and display are disabled. | |||
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Battery power indicator | (Charge Soon Alert) | be kept internally. | |||
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• The flashing charge indicator ( |
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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 batteries are charged, but you need to set the time and date, after the batteries reach Level 3 (indicated by the flashing charge indicator) from Level 4. You will not be able to configure any of the other settings until the batteries reach Level 2 (no charge indicator) 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 momentarily show a reading that is higher than the actual battery level. The correct battery power indicator should appear after a few minutes.
•If you use the light or alarms a number of times during a short period, the recover indicator appears and the following operations become disabled until battery power recovers.
Illumination Beeper tone
Coordination between digital and analog timekeeping Time calibration signal reception
After some time, battery power will recover and the recover indicator 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 batteries. 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 batteries 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 7 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) | 6 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.
•Display on 18 hours per day, sleep state 6 hours per day
•1 illumination operation (1.5 seconds) per day
•10 seconds of alarm operation per day
•5 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 batteries from one level to the next.
Exposure Level | Approximate Exposure Time |
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Outdoor Sunlight (50,000 lux) | 2 hours | 19 hours |
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Sunlight Through a Window | 7 hours | 97 hours |
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Daylight Through a Window | 11 hours | 157 hours |
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on a Cloudy Day (5,000 lux) |
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Indoor Fluorescent Lighting | 113 hours | – – – | |||||||||||
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•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 manually set the current date and time.
• When setting the time, you can also configure settings for the illumination duration,
the
• All of the operations in this section are performed in the Timekeeping Mode, which
you can enter by pressing C. | Seconds | Seconds | Hour: |
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Mode indicator | Day |
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Press B. | B | B |
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week | Reception date | Reception | ||||
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DST indicator | Screen |
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Setting the Digital 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 digital time and date manually
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| City Code |
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3.When the setting you want to change is flashing, use B and/or Dto change it as described below.
Screen: | To do this: | Do this: |
| Change the city code | Use D (east) and B(west). |
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| Cycle between Daylight Saving Time | Press D. |
| (ON), Standard Time (OFF), and |
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| Toggle between | Press D. |
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| Reset the seconds to 00 | Press D. |
| Toggle the illumination duration | Press B. |
| setting between 1.5 seconds ( ) and |
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| Change the hour or minutes | Use D (+) and B |
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| Change the year |
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| Change the month or day |
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| Toggle Power Saving on (ON) and | Press D. |
| off (OFF) |
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4