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Operation Guide 3725 3726
4
To turn the auto light switch on and off
In any mode, hold down L 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 is automatically turned off whenever battery power is at Level 4.
After battery power recovers to Level 2, you will have to perform the above procedure
to turn the auto light switch back on again.
• 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 special rechargeable batteries (secondary
batteries) that are 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
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.
• Normally, you should try to keep the
watch outside of your sleeve as much
as possible. Charging is significantly
reduced if the face is only partially
covered.
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. Make sure that the watch is normally exposed to bright light
whenever possible.
• This watch uses special rechargeable batteries to store power produced by the solar
cell, so regular battery replacement is not required. However, after very long use, the
rechargeable batteries may lose its ability to achieve a full charge. If you experience
problems getting the special rechargeable batteries to fully charge, contact your
dealer or CASIO distributor about having them replaced.
• Never try to remove or replace the watch’s special batteries yourself. Use of the
wrong type of batteries 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 4 and if
you should ever need to have the rechargeable batteries 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
batteries from going dead.
Function Status
All functions enabled.
All functions enabled.
Auto and manual receive,
alarm, hourly time signal,
illumination, auto light switch,
and display are disabled.
Though the hands of the watch
do not move, time continues to
be kept internally.
All functions, including timekeeping,
disabled and initialized.
Battery Power Indicator and Recover Indicator
The battery power indicator shows you the current power level of the rechargeable
batteries.
Level
1
2
3
4
Battery Power
Indicator
Battery power indicator
Recover indicator
(Charge Soon Alert)
l
l
l
l
l
l
l
l
l
l
l
l
• The flashing 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 batteries are
charged, but you need to set the time and date, after the batteries reach 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 batteries reach 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 momentarily show a reading that is 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 appears and the following operations become disabled until battery power
recovers.
Illumination
Beeper tone
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 batteries.
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 batteries 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
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)
Approximate Exposure Time
6 minutes
30 minutes
48 minutes
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 day
• 1 illumination operation (1.5 seconds) per day
• 10 seconds of alarm operation per day
• 5 times calibration reception per day
• Stable operation is promoted by frequent charging.
Charging Guide
After a full charge, timekeeping remains enabled for up to about 7 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.
Recovery Times
The table below shows the amount exposure that is required to take the batteries from
one level to the next.
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
5 hours
22 hours
36 hours
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)
Approximate Exposure Time
Level 4 Level 3 Level 2 Level 1
▲
▲
▲
2 hours
7 hours
11 hours
113 hours
▲
– – –
19 hours
97 hours
157 hours
Timekeeping
Use the Timekeeping Mode to set and view the current time and date. This section
also explains how to manually set the current date and time.
• When setting the time, you can also configure settings for the illumination duration,
the 12/24-hour format, and power saving on/off.
• All of the operations in this section are performed in the Timekeeping Mode, which
you can enter by pressing C.
▲
Press B.
Day
Day of week
Seconds
Month. Day
Hour:
Minutes
PM indicator
▲
▲
Mode indicator
Press D.
Last Signal
Screen
Reception date
Seconds
Day of
week
Reception
time
▲
BB
B
Seconds
DST indicator
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Setting the Digital Time and Date Manually
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 current digital time and date manually
1.In the Timekeeping Mode, hold down A until the city
code starts to flash in the bottom dial, which indicates
the setting screen.
2.Press C to change the flashing contents in the
sequence shown below to select other settings.
City code
3. When the setting you want to change is flashing, use B and/or D to change it as
described below.
Seconds
Hour
Minutes
12/24-Hour
Format
Month Year
DST
Day
Power
Saving
City Code
Screen: To do this:
Change the city code
Cycle between Daylight Saving Time
(
ON), Standard Time (OFF), and
Auto DST (AvtA)
Toggle between 12-hour (
12H) and
24-hour (
24H) timekeeping
Do this:
Use D (east) and B (west).
Press D.
Press D.
Reset the seconds to 00
Toggle the illumination duration
setting between 1.5 seconds (
) and
2.5 seconds ( )
Change the hour or minutes
Change the year
Change the month or day
Toggle Power Saving on (
ON
) and
off (
OFF
)
Press D.
Press B.
Use D (+) and B (–).
Press D.