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Operation Guide 2913
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 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
Battery power indicator
1
2
3
Recover indicator
(Charge Soon Alert)
4
• The flashing charge indicator ( CHG ) 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.
• 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 11 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)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Day
(5,000 lux)
Indoor Fluorescent Lighting (500 lux)
• Since these are the specs, we can include all the technical details.
• 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
• 16 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
Outdoor Sunlight (50,000 lux)
2 hours
Sunlight Through a Window
5 hours
(10,000 lux)
Daylight Through a Window
9 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.
Function Status
All functions enabled.
All functions enabled.
Alarm, hourly time signal,
illumination, auto light switch,
and display disabled.
All functions, including
timekeeping, disabled and
initialized.
Approximate Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
Level 3
Level 2
Level 1
22 hours
6 hours
109 hours
30 hours
222 hours
61 hours
– – –
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 B to change the display format as shown
below.
• Pressing D in the Timekeeping Mode will display the Last Signal screen.
Hour : Minutes Seconds
Press B.
Month – Day
PM indicator
Press D.
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 A until the city
code starts to flash, which indicates the setting screen.
2. Press C to change the flashing contents in the
sequence shown below to select other settings.
City code
12/24-Hour
City Code
DST
Format
Power
Day
Month
Saving
3. When the setting you want to change is flashing, use B and/or D to change it as
described below.
Screen:
To do this:
Change the city code
Cycle between auto DST (
Time (
OF
), and Daylight Saving Time
(
ON
)
Toggle between 12-hour (
24-hour (
24H
) timekeeping
Reset the seconds to 00
Toggle the illumination duration setting
between 1.5 seconds ( ) and 2.5
seconds ( )
Change the hour, minutes, or year
Change the month or day
Toggle Power Saving on (
ON
(
OF
)
• See "City Code Table" for a complete list of available city codes.
• Auto DST (
A
) can be selected only while
as the Home City code. For more information, see "Daylight Saving Time (DST)"
below.
• For information about settings other than the time and date, see the following.
Illumination duration: Illumination
Power Saving: Power Saving Function
4. Press A to exit the setting screen.
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 signal transmitted from Fort Collins includes 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 (
A
) whenever you select
or
NYC
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 A until the city code starts to flash, which
indicates the setting screen.
2. Press C and the DST setting screen appears.
3. Use D to cycle through the DST settings in the sequence shown below.
Auto DST (
)
DST off (
A
OF
4. When the setting you want is selected, press A to exit the setting screen.
• The DST indicator appears to indicate that Daylight Saving Time is turned on.
Day of week
Day of the Week Screen
L
Press D.
Last Signal Screen
Seconds
Hour
Year
Minutes
Do this:
Use D (east) and B
(west).
Press D.
), Standard
A
Press D.
12H
) and
Press D.
Press B.
Use D (+) and B (–).
Press D.
) and off
LAX
,
DEN
,
CHI
, or
NYC
is selected
LAX
,
DEN
,
CHI
,
)
DST on (
)
ON
4
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