Operation Guide 3379
Illumination
Auto light switch indicator
An LED
•The auto light switch must be turned on (indicated by the auto light switch indicator) for it to operate.
•See “Illumination Precautions” for other important information.To turn on illumination manually
In any mode, press L to illuminate the digital display areas.•You can specify 1.5 seconds or 2.5 seconds as the illumination duration. See “To set the digital time and date” for more information.
•The above operation turns on illumination regardless of the current auto light switch setting.
• The flashing charge indicator ( 
) at Level 3 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 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 |
After some time, battery power will recover and the recover indicator will disappear, |
About the Auto Light Switch
Turning on the auto light switch causes illumination to turn on whenever you position your wrist as described below in any mode. Note that this watch features a “Full Auto Light,” so the auto light switch operates only when available light is below a certain level. It does not illuminate the digital display areas under bright light.
Moving the watch to a position that is parallel to the ground and then tilting it towards you more than 40 degrees causes illumination to turn on.
•Wear the watch on the outside of your wrist.| Parallel to | More than |
| ground | 40° |
Warning!
•Always make sure you are in a safe place whenever you are reading 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 surprise 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 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 | Solar cell |
| is 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 |
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| blocked by clothing, etc. |
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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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1 |
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| All functions enabled. |
2 |
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| All functions enabled. |
3 |
| lll | Alarm, hourly time signal, | |
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| illumination, auto light switch, | ||
| l | l |
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| l |
| l | and display are disabled. |
| l |
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| l l | Though the hands of the watch | ||
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| ll |
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| do not move, time continues to |
| (Charge Soon Alert) | be kept internally. | ||
| Battery power indicator |
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| All functions, including timekeeping, |
4 |
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| disabled and initialized. | |
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| 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 sunlightCharging 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) | 4 minutes |
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| Sunlight Through a Window (10,000 lux) | 19 minutes |
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| Daylight Through a Window on a Cloudy Day | 29 minutes |
| (5,000 lux) |
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| Indoor Fluorescent Lighting (500 lux) | 5 hours |
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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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(Brightness) |
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| Level 4 |
| Level 3 |
| Level 2 |
| Level 1 | |||||
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Outdoor Sunlight (50,000 lux) | 2 hours |
| 19 hours |
| 5 hours | ||||||
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| Sunlight Through a Window | 7 hours |
| 94 hours |
| 22 hours | ||||||
| (10,000 lux) |
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| Daylight Through a Window | 10 hours |
| 152 hours |
| 35 hours | ||||||
| on a Cloudy Day (5,000 lux) |
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| Indoor Fluorescent Lighting | 109 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
When turned on, the Power Saving function automatically puts the watch into a sleep state whenever it is left for a certain period in an area where it is dark. The table below shows how watch functions are affected by Power Saving.
Power saving indicator
Elapsed Time in Dark | Functions |
| 60 to 70 minutes | • LCD off |
| • Alarm, hourly time signal, and analog timekeeping |
| 6 or 7 days | • LCD off, alarm and hourly time signal 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 10:59 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 a3