— 6 —
About the Auto Light Switch
Turning on the auto light switch causes the backlight to turn on for about one second,
whenever you position your wrist as described below in any mode. Note that this
watch features a “Full Auto LED Light,” so the auto light switch operates only when
available light is below a certain level. It does not turn on the backlight under bright
light.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you more than 40 degrees causes the backlight to turn
on.
Parallel to
ground
More than
40°
Warning!
• Always make sure you are in a safe place whenever you are reading the
display of 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
surprise 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 the Timekeeping Mode, hold down B for about two seconds to toggle the auto light
switch on (the auto light switch on indicator displayed) and off (the auto light switch on
indicator not displayed).
• The auto light switch on indicator is on the display in all modes while the auto light
switch is tur
ned on.
Battery
This watch is equipped with a solar cell and a 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 is pointing at a light source.
• Note that charging efficiency
drops when any part of the solar
cell is blocked by clothing, etc.
• The illustration shows how to
position a watch with a resin band.
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 normally exposed to bright light
whenever possible
.
Solar cell
• Normally, the rechargeable battery should not need replacement, but after very long
use over a number of years, the rechargeable battery may lose its ability to achieve
a full charge. Should you notice problems with getting the rechargeable battery to a
full charge, contact your dealer or CASIO distributor about having the rechargeable
battery replaced.
• The rechargeable battery should be replaced with a CASIO-specified CTL1616
battery only. Other rechargeable batteries can cause damage to 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
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.
Function Status
All functions enabled.
All functions enabled.
Auto and manual signal
receive, alarm, hourly time
signal, backlight, and display
are disabled. Though the hands
of the watch do not move, time
continues to be kept internally.
All functions, including
timekeeping, disabled.
Battery Power Indicator
The battery power indicator on the display shows you the current status of the
rechargeable battery’s power
.
Le
vel
1
2
3
4
Battery Po
wer
Indicator
Battery power indicator
Hi
Mid
Lo
w
Hi
Mid
Lo
w
Hi
Mid
Low
C
l
l
l
l
l
l
l
l
l
l
l
l
l
l
Hi
Mid
Lo
w
• The flashing CHARGE indicator (
C
) 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 flashing CHARGE indicator (
C
) ) 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 temporarily 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, a RECOVER
indicator (
R
) appears on the display and the following operations become disabled
until battery power recovers.
Backlight
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 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 5 months, while the
watch is used under the conditions described below.
Operating Conditions
•
Watch is not exposed to light
•
1 backlight operation (1.5 seconds) per day
•
10 seconds of alarm operation per day
•
5 time calibration signal receptions 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 ne
xt.
Exposure Le
vel (Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Da
y
(5,000 lux)
Indoor Fluorescent Lighting (500 lux)
Approximate Exposure
Time
5 minu
tes
24 minutes
48 minu
tes
8 hours
Charge Times
Exposing the watch to light for the periods shown below each day restores the power
used by the above operating conditions.
13 hours
66 hours
4 hours
18 hours
– –
–
– – –
The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
Exposure Level
(Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Windo
w
(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 Lev
el 1
▲
▲
▲
1 hour
3 hours
5 hours
45 hours
▲
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Power Saving Function
When turned on, the Power Saving function automatically
enters a sleep state whenever the watch is left in an area
where lighting is dim (less than about 30 lux).
The following shows how watch functions are affected
when left in a dark place while in the sleep state
.
l
l
l
l
l
l
l
l
l
l
l
l
l
Power Saving
indicator
The sleep state is indicated by a blank screen with the Power Saving indicator (
PS
)
flashing on it.
•
Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
•
•
Even when the watch is in the sleep state, digital-analog time coordination and auto
signal receive are both performed.
Approximate Pe
riod
in sleep state
3 to 4 da
ys
8 da
ys or more
Functions
• LCD off
• Alarm, hourly time signal, analog timek
eeping and auto
signal receive enabled
• LCD off, alarm and hourly time signal disabled
• Analog timekeeping stopped at 12 o’clock
• Auto signal receive disab
led
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area.
• Press any button.
• Angle the watch towards your face for reading.
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