The LOW indicator flashes on the display in the Timekeeping Mode when battery is at Level 3.
The LOW indicator at Level 3 and the flashing charge indicator (CHG) at Level 4 tell 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. 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 4 (indicated by the flashing charge indicator) from Level 5. You will not be able to configure any of the other settings until the battery reaches Level 3 (no charge indicator) after dropping to Level 5.
Leaving the watch in direct sunlight or some other very strong light source can cause the battery power indicator to show a reading that is momentarily 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 (RECOV) appears and the following operations become disabled until battery power recovers.
Illumination Beeper tone
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 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
5
All functions, including timekeeping, disabled and initialized.
(Charge Soon Alert)
(Charge Soon Alert)
3
Alarm, hourly time signal, illumination and time calibration signal reception disabled.
2
All functions enabled.
1
All functions enabled.
Battery power indicator

Operation Guide 3017

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 startle 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 B 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 indicator remains in all modes while the auto light switch is turned on.

Power Supply

This watch is equipped with a solar cell and a special 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

Solar cell

is pointing at a light source.

 

The illustration shows how to position

 

a watch with a resin band.

 

Note that charging efficiency dropswhen any part of the solar cell is blocked by clothing, etc.

You should try to keep the watch outside of your sleeve as much as possible. Charging is reduced

significantly 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 a special 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 special rechargeable battery to charge fully, contact your dealer or CASIO distributor about having it replaced.

Never try to remove or replace the watch’s special battery yourself. Use of the wrong type of battery can damage the watch.

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 shows you the current power level of the rechargeable

battery.Level Battery Power IndicatorFunction Status

 

 

 

 

 

 

 

4

 

 

All functions, including auto

Recover indicator

 

 

 

 

 

light swich, disabled.

 

 

 

 

 

 

 

 

Charging Guide
After a full charge, timekeeping remains enabled for up to about 9 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 Day48 minutes
(5,000 lux)

 

 

 

Indoor Fluorescent Lighting (500 lux)8 hours

 

 

Since these are the specs, we can include all the technical details.Display on 18 hours per day, sleep state 6 hours per day1 illumination operation (1.5 seconds) per day10 seconds of alarm operation per day10 minutes of signal reception per dayStable 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

 

 

 

 

 

(Brightness)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Level 5

Level 4

 

Level 3

 

Level 2

Level 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outdoor Sunlight

 

 

 

2 hours

 

 

 

25 hours7 hours
(50,000 lux)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sunlight Through a Window

 

 

 

6 hours

 

 

 

127 hours35 hours
(10,000 lux)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Daylight Through a Window

 

 

 

11 hours

 

 

 

257 hours71 hours
on a Cloudy Day (5,000 lux)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor Fluorescent Lighting

 

120 hours

 

 

 

– – –

(500 lux)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

When setting the time, you can also configure settings for the illumination duration, the 12/24-hour format, and power saving on/off, and you can specify the screens that are displayed in the Timekeeping Mode.

In the Timekeeping Mode, you can press A to toggle the display contents as shown below.

Day of the Week/Date

PM indicator

Day of week

Month – Day

 

Press A.

 

Hour : Minutes

Seconds

 

Time/Date

Hour : Minutes

Day of week

 

Press A.

 

Month – Day

Seconds

Pressing Din the Timekeeping Mode will display the Last Signal screen.

Day of the Week/Date

 

Press A.

 

 

 

 

 

 

Press D.

 

 

 

 

 

 

 

 

Press D.

 

 

 

Time/Date

Press A. Press D.

Last Signal Screen

 

 

 

Press D.

 

Last Signal Screen

4