Operation Guide 5135
Stopwatch
The stopwatch lets you measure elapsed times.
• The display range of the stopwatch is 59 minutes, 59.9 seconds.
• The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it.
• The stopwatch measurement operation continues even if you exit the Stopwatch Mode.
•All of the operations in this section are performed in the
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| Seconds | Stopwatch Mode, which you enter by pressing B. | |||||
Minutes |
| 1/10 second |
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To measure times with the stopwatch |
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C |
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| ➤ C | ➤ C | ➤ C | ➤ C | |
Start |
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| Stop | (About 1 second) | ||
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| Clear |
Countdown Timer |
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| You can set the countdown timer within a range of one to | ||
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| 100 minutes. An alarm sounds when the cowntdown | ||
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| reaches zero. |
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| • All of the operations in this section are performed in the | ||
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| Countdown Timer Mode, which you enter by pressing | ||
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| B. |
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| Countdown End Beeper |
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| Minutes |
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| The countdown end beeper lets you know when the | |||
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| Seconds | countdown reaches zero. The beeper stops after about 10 | |||||
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To configure the countdown timer |
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| 1. While the countdown start time is on the display in the | ||
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| Countdown Timer Mode, hold down Auntil the current | ||
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| countdown start time starts to flash, which indicates the | ||
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| setting screen. |
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| • If the countdown start time is not displayed, use the | ||
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| procedure under “To use the countdown timer” to | ||
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| display it. |
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2.Press Cto scroll the minute setting value.
•To specify a countdown time of 100 minutes, set 00:00.
3.Press Ato exit the setting screen.
To use the countdown timer
Press C while in the Countdown Timer Mode to start the countdown timer.
• The countdown timer operation continues even if you exit the Countdown Timer Mode.
• Press Cwhile a countdown operation is in progress to pause it. Press Cagain to resume the countdown.
•To stop a countdown operation completely, hold down
Cfor about one second until the countdown time returns to its starting value.
Example: Orient the watch so its face is | Solar cell |
pointing at a light source. |
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• The illustration shows how to position a |
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watch with a resin band. |
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• Note that charging efficiency drops when |
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any part of the solar cell is blocked by |
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clothing, etc. |
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•You should try to keep the watch outside of your sleeve as much as possible. Charging
is reduced significantly if the face is covered only partially.
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 exposed to bright light whenever possible.
•This watch uses a 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 rechargeable battery to charge fully, contact your dealer or CASIO distributor about having it replaced.
•Never try to remove or replace the watch’s rechargeable battery yourself. Use of the wrong type of battery 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 5 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 |
1 |
| All functions enabled. |
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| All functions enabled. |
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3 |
| Watch enters Timekeeping Mode and second |
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| hand jumps every two seconds. Auto and manual |
| (Charge Soon Alert) | receive, illumination, and beeper disabled. |
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4 |
| All hands stop at 12 o’clock, all functions and |
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| display indicators disabled. |
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5 |
| All functions disabled. |
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•The flashing 
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 5, all functions are disabled and settings return to their initial factory defaults. Once the battery reaches Level 2 after falling to Level 5, reconfigure the current time, date, and other settings.
•The watch’s Home City code setting will change automatically to TYO (Tokyo) whenever the battery drops to Level 5. With this Home City code setting, the watch is configured to receive the time calibration signals of Japan. If you are using the watch in North America or Europe, or China you will need to change the Home City code setting to match your location whenever the battery drops to Level 5.
•Display indicators reappear as soon as the battery is charged from Level 5 to Level 2.
•Leaving the watch exposed to direct sunlight or some other very strong light source can cause the battery power indicator to show a reading temporarily that is higher than the actual battery level. The correct battery level should be indicated after a few minutes.
•Performing illumination, or beeper operations during a
short period may cause 
(recover) to appear on the display.
After some time, battery power will recover and 
(recover) will disappear, indicating that the above functions are enabled again.
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(recover) appears frequently, it probably means
Recover indicator | that remaining battery power is low. Leave the watch in |
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| 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
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 |
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Outdoor Sunlight (50,000 lux) | 8 minutes |
Sunlight Through a Window (10,000 lux) | 30 minutes |
Daylight Through a Window on a Cloudy Day (5,000 lux) | 48 minutes |
Indoor Fluorescent Lighting (500 lux) | 8 hours |
•For details about the battery operating time and daily operating conditions, see the “Power Supply” section of the Specifications.
•Stable operation is promoted by frequent exposure to light.
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) | Level 5 | Level 4 | Level 3 | Level 2 | Level 1 | |||
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Outdoor Sunlight |
| 2 hours |
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| 16 hours | 5 hours | ||
(50,000 lux) |
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Sunlight Through a |
| 4 hours |
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| 58 hours | 16 hours | ||
Window (10,000 lux) |
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Daylight Through a |
| 7 hours |
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Window on a Cloudy |
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Day (5,000 lux) |
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Indoor Fluorescent |
| 76 hours |
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Lighting (500 lux) |
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•The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.
Timekeeping
Read This Before You Set the Time and Date!
This watch is preset with a number of city codes, each of which represents the time zone where that city is located. When setting the time, it is important that you first select the correct city code for your Home City (the city where you normally use the watch). If your location is not included in the preset city codes, select the preset city code that is in the same time zone as your location.
•Note that all of the times for the World Time Mode city codes are displayed in accordance with the time and date settings you configure in the Timekeeping Mode.
•The watch automatically adjusts its analog setting to match the current digital setup of your Home City. If the analog time is not correct even though you are sure the digital setup of your Home City is correct and the watch is performing signal reception properly, check the home positions of the hands and make adjustments if necessary.
To set the time and date manually
1.In the Timekeeping Mode, hold down A for about three seconds. You can release the button after “ADJ”
appears on the display.
• At this time, “12H”
•The second hand will move to 12 o’clock and stop there.
2.Press Cto toggle between
3.Press Band the city code of the current Home City will flash on the display.
4.Use C to select the city code you want.
•Make sure you select your Home City code before changing any other setting.
•For full information on city codes, see the “City Code Table”.
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