Casio 2924 Power Supply, Timekeeping, Battery Power Indicator and Recover Indicator, Charging Precautions, Charging Guide, Setting the Time and Date

Operation Guide 2924

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 drops

when 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. Even if the face of the watch

is only partially blocked from light, charging will be reduced significantly.

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 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 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 shows you the current power level of the rechargeable battery.

Level	Battery Power Indicator	Function Status
Recover indicator
1		All functions enabled.
2		All functions enabled.
3		Alarm, hourly time signal,
		illumination, auto light switch,
Battery power indicator	(Charge Soon Alert)	and display disabled.
4		All functions, including
		timekeeping, disabled and
		initialized.

•The 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 (indicated by the flashing charge indicator) from Level 4. You will not be able to configure any of the other settings until the battery reaches Level 2 (no charge indicator) after dropping to Level 4.

•The Home City reverts to TYO (Tokyo), which means that the watch is configured to receive the Japanese time calibration signal, whenever battery power drops to Level 4.

If you are using the watch in North America, you will need to configure your Home City code setting whenever battery power recovers 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 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

Charging Guide

After a full charge, timekeeping remains enabled for up to about eight 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	48 minutes
(5,000 lux)
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

•Display on 18 hours per day, sleep state 6 hours per day

•1 illumination operation (1.5 seconds) per day

•10 seconds of alarm operation per day

•15 minutes of signal reception per day

•Stable operation is promoted by frequent charging.

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 4		Level 3		Level 2	Level 1
		▲		▲	▲		▲
Outdoor Sunlight (50,000 lux)	2 hours				22 hours	6 hours
Sunlight Through a Window	5 hours				109 hours	30 hours
(10,000 lux)
Daylight Through a Window	9 hours				222 hours	61 hours
on a Cloudy Day (5,000 lux)
Indoor Fluorescent Lighting	101 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.

•In the Timekeeping Mode, you can press Ato change the display format as shown below.

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

Day of week

Month – Day
▲	Press A.
	▲
▲	Day of the Week Screen
PM indicator
	Press D.	▲
Hour : Minutes
Seconds	Press D.	▲
	▲

Last Signal Screen

Setting the Time and Date

Make sure you select your Home City code before you change the current time and date settings. World Time Mode times are all displayed in accordance with the Timekeeping Mode settings. Because of this, World Time Mode times will not be correct if you do not select the proper Home City code before setting the time and date in the Timekeeping Mode.

To set the time and date

1. In the Timekeeping Mode, hold down Auntil the city

City code					code starts to flash, which indicates the setting screen.
					2. Press C to change the flashing contents in the
	l l l l l				sequence shown below to select other settings.
l			l
ll			l
l	l l	l l l	l	l
City Code					DST	12/24-Hour	Seconds	Hour
						Format
Power					Day	Month	Year	Minutes
Saving

3.When the setting you want to change is flashing, use Band/or Dto change it as described below.

Screen:	To do this:		Do this:
	Change the city code		Use D(east) and
			B(west).
	Cycle between auto DST (A), Standard Time		Press D.
	(OF), and Daylight Saving Time (ON)
	Toggle between 12-hour (12H) and 24-hour		Press D.
	(24H) timekeeping
	Reset the seconds to 00		Press D.
	Toggle the illumination duration setting		Press B.
	between 1.5 seconds ( ) and 2.5 seconds (	)
	Change the hour, minutes, or year		Use D(+) and B
			(–).
	Change the month or day
	Toggle Power Saving on (ON) and off (OF)		Press D.

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