Operation Guide 2858 2859 2860 2861 
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from Standard Time. Remember that not all countries or even local areas use Daylight Saving Time.
The time calibration signals transmitted from Rugby and Mainflingen include both Standard Time and DST data. When the Auto DST setting is turned on, the watch switches between Standard Time and DST (summer time) automatically in accordance with the received time signal.
•The default DST setting is Auto DST (AUtO) whenever you select LON, PAR, BER, or ATH as your Home City code.
•If you experience problems receiving the time calibration signal in your area, it is probably best to switch between Standard Time and Daylight Saving Time (summer time) manually.
To change the Daylight Saving Time (summer time) setting
1.In the Timekeeping Mode, hold down Auntil the city code setting starts to flash, which indicates the setting screen.
2.Press Ctwice and the DST setting screen appears.
3.Use D to cycle through the DST settings in the sequence shown below.
Auto DST (AUtO) |
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| DST off (OFF) |
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| DST on (ON) |
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4. When the setting you want is selected, press Atwice to exit the setting screen.
Backlight
The backlight uses an EL
dark. The watch’s auto light switch automatically turns on the backlight when you angle the watch towards your face
in the dark.
• The auto light switch must be turned on (indicated by
the auto light switch on indicator) for it to operate.
• See “Backlight Precautions” for other important information about using the backlight.
To turn on the backlight manually
In any mode, press Lto illuminate the display for about one second.
•The above operation turns on the backlight regardless of the current auto light switch setting.
About the Auto Light Switch
Turning on the auto light switch causes the backlight to turn on for about one second, whenever you position your wrist as described below in any mode. Note that this watch features a “Full Auto EL Light,” so the auto light switch operates only when available light is below a certain level. It does not turn on the backlight 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 the backlight to turn on.
Parallel to |
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ground | More than |
| 40° |
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 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 on indicator displayed) or off (auto light switch on indicator not displayed).
•The auto light switch on indicator is on the display in all modes while the auto light switch is turned on.
Battery
This watch is equipped with a solar cell and a 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 |
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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 |
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when any part of the solar cell is |
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blocked by clothing, etc. |
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•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. Be sure that the watch is normally exposed to bright light whenever possible.
•This watch employs a solar cell that converts light into electricity, which charges a
•The rechargeable battery should be replaced with a
•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 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 and Recover 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 | |
Battery power | 1 | Module 2858/2859 | 2860/2861 | All functions enabled. |
indicator |
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| 2 |
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| All functions enabled. |
| 3 |
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| Beeper tone, backlight, |
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| calibration signal |
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| reception, display, and |
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| (Charge Soon Alert) | buttons are disabled. | |
Recover |
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indicator | 4 |
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| All functions, including |
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| timekeeping, are |
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| disabled. |
•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 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.
•Display indicators reappear as soon as the battery is charged from Level 4 to Level 3.
•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 higher than the actual 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
) 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
) will disappear, indicating that the above functions are enabled again.
•If the recover indicator appears frequently, it probably means that remaining battery power is low. Leave the watch in bright light to allow it to charge.
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
•Internal timekeeping
•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
•5 times calibration reception per day
•Stable operation is promoted by frequent charging.
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