USER’S GUIDE 2367/2739
Alarm Operation
The alarm sounds at the preset time for about 10 seconds in all modes, or until you stop it by pressing any button.
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
To turn an alarm and the Hourly Time Signal on and off
1.In the Alarm Mode, press Dto select an alarm or the Hourly Time Signal.
2.When the alarm or the Hourly Time Signal you want to is selected, press Ato turn it on and off.
• The alarm on indicator (
) and the Hourly Time Signal on indicator ( ) are shown on the display in all modes while these functions are turned on.
•If any alarm is on, the alarm on indicator is shown on the display in all modes.
Stopwatch
The stopwatch lets you measure elapsed time, split times, and two finishes.
Minutes • The display range of the stopwatch is 23 hours, 59 minutes, 59.99 seconds.
•The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it.
Hours | • The stopwatch measurement operation continues |
| even if you exit the Stopwatch Mode. |
•All of the operations in this section are performed in
the Stopwatch Mode, which you enter by pressing
SecondsC. 1/100 second
To measure times with the stopwatch
Elapsed Time
D | ➤D | ➤ D | ➤ D | ➤A |
Start | Stop |
| Stop | Clear |
Split Time |
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D | ➤A | ➤A | ➤D | ➤A |
Start | Split | Split release | Stop | Clear |
Two Finishes |
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D | ➤A | ➤D | ➤A | ➤A |
Start | Split | Stop | Split release | Clear |
| First runner | Second runner | Display time of |
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| finishes. | finishes. | second runner. |
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| Display time of |
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| first runner. |
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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.
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 light whenever possible.
•This watch employs a solar cell that converts light into electricity that charges a built- in rechargeable battery. Normally, the rechargeable battery should not need replacement, but after very long use over a number of years, the rechargeable battery may lose its ability to achieve a full charge. Should you notice problems with getting the rechargeable battery to a full charge, contact your dealer or CASIO distributor about having the rechargeable battery replaced.
•The rechargeable battery should be replaced with a
•Turn on the watch’s sleep mode and keep it in an area normally exposed to 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 | Function Status | |||
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| Indicator |
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| 1 |
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| All functions enabled. |
| 2 |
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| All functions enabled. |
3 | l l | ll | Auto and manual signal receive, | |||
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| l | alarm, hourly time signal, backlight, |
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Battery power | l |
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| l l | l |
| and display are disabled. Though | ||
indicator |
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RECOVER |
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| the hands of the watch do not | |
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| move, time continues to be kept | ||
indicator |
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4
All functions, including timekeeping, are disabled.
•At Level 4, all functions are disabled. Functions are enabled once again after the rechargeable battery is charged, but anything previously stored in memory is lost. Because of this, you must set the current time and alarms, and
•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 light or alarms a number of times during a short period, a RECOVER
indicator ( 
)appears on the display and the following operations become disabled until battery power recovers.
Backlight
Alarm and hourly time signal
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 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 sunlight to charge its rechargeable battery can cause it to become quite hot. Take care when handling the watch to avoid burn injury.
•On the dashboard of a car parked in direct sunlight
•Too close to an incandescent lamp
•Under direct sunlight or in any other area exposed to intense heat for long periods
Charging Guide
After a full charge, timekeeping remains enabled for up to about six months, while the watch is used under the conditions described below.
Operating Conditions
•Watch is not exposed to light
•1 backlight operation (1.5 seconds) per day
•10 seconds of alarm operation per day
•2 signal receive operations per day
Charge Times
Exposing the watch to light for the periods shown below each day restores the power used by the above operating conditions.
Exposure Level (Brightness) | Approximate Exposure Time |
Outdoor Sunlight (50,000 lux) | 5 minutes |
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Sunlight Through a Window (10,000 lux) | 24 minutes |
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Daylight Through a Window on a Cloudy | 48 minutes |
Day (5,000 lux) |
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Indoor Fluorescent Lighting (500 lux) | 8 hours |
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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 4 | Level 3 | Level 2 |
| Level 1 | ||||
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Outdoor Sunlight (50,000 lux) | 54 minutes | 14 hours |
| 3 hours | ||||
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Sunlight Through a Window (10,000 lux) | 3 hours | 71 hours |
| 14 hours | ||||
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Daylight Through a Window on a Cloudy | 5 hours | – – – – – |
| – – – – – | ||||
Day (5,000 lux) |
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Indoor Fluorescent Lighting (500 lux) | 41 hours | – – – – – |
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•The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.
•Stable operation is promoted by frequent charging.
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 any mode (except for the Stopwatch Mode) for two or three minutes without performing any operation, it automatically changes to the Timekeeping Mode.
•If you leave a screen with flashing digits or a cursor on the display for two or three minutes without performing any operation, the watch automatically saves anything you have input up to that point and exits the setting screen.
Data and Setting Scrolling
The Band D buttons are used in various modes and setting screens to scroll through data on the display. In most cases, holding down these buttons during a scroll operation scrolls through the data at high speed.
Initial Screens
The following shows what appears on the display first in each mode.
Mode | Screen |
Alarm | Data you were last viewing. |
Day Counter | Target Date/Text screen with data you were last viewing. |
Telememo | Memory Number/Name screen with data you were last |
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Time Calibration Signal Reception Precautions
•This watch is able to receive the time calibration signal transmitted from Mainflingen, Germany (located 25
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| kilometers southeast of Frankfurt). Signal reception is |
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| possible within the area represented by a circle with a |
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| radius of about 1,000 kilometers. |
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| At distances further than about 500 kilometers, the |
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| signal may become weak and reception may be |
| • | impossible under certain conditions. |
Frankfurt | Even when the watch is within the reception range, | |
| signal reception is impossible if the signal is blocked by | |
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| mountains or other geological formations between the |
| • | watch and signal source. |
| Signal reception may be poor in the shaded area on the | |
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| map, even though it is within 1,000 kilometers of the |
| • | signal transmitter. |
| Signal reception is affected by weather, atmospheric | |
| • | conditions, and seasonal changes. |
| The time calibration signal is bounced off the | |
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| ionosphere. Because of this, such factors as changes in |
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| the reflectivity of the ionosphere, as well as movement |
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| of the ionosphere to higher altitudes due to seasonal |
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| atmospheric changes or the time of day may change the |
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| reception range of the signal and make reception |
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| temporarily impossible. |
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| 4 |