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Warning!
• Always make sure you are in a safe place whenever you are reading the face
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 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 (except when a setting screen is on the display), hold down B for about
two seconds to toggle the auto light switch on (
displayed).
• The auto light switch on indicator (
) is on the display in all modes while the auto
light switch is turned on.
• The auto light switch turns off automatically whenever battery power drops to Level
3.
• The auto light switch is disabled, regardless of its on/off setting, when the Hand
Setting Mode's setting screen.
To specify the illumination duration
1. In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2. Press C three times to move the flashing to the
seconds setting.
3. Press B to toggle the illumination duration setting
between 3 seconds ( ) and 1.5 seconds ( ).
4. Press A to exit the setting screen.
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
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 significantly reduced.
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 fully charge, 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 Levels
The digital display show you the current level of the rechargeable battery's power.
• All of the watch's functions are available when
indicated on the Battery Level Screen.
Level
Digital Display
1
2
3
(Charge
soon alert)
Charge indicator
4
• Level 1 and Level 2 are indicated on the Battery Level Screen only. Level 3 and
Level 4 are indicated in all modes.
• 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.
• When the battery level approaches Level 3, the analog hands move automatically to
the 12 o'clock position. Charge the battery as soon as possible when this happens.
All of the digital screen indicators flash while the analog hands are in motion.
• 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 digital time and date, after the battery reaches
Level 3 from Level 4. You will not be able to set any of the other settings until the
battery reaches Level 2 after dropping to Level 4.
• Display indicators reappear as soon as the battery is charged from Level 4 to Level 3.
• If the analog time and digital time do not match after the watch recovers to Level 2
from Level 3 or Level 4, adjust the analog hand setting so it matches the digital time.
• Leaving the watch exposed to direct sunlight or some other very strong light source
can cause the digital display to show a reading temporarily that is higher than the
actual battery level. The correct battery level should be indicated after a few minutes.
displayed) and off (
not
Solar cell
(high) or
(medium) is
Function Status
All functions enabled.
All functions enabled.
Except for internal
timekeeping and the charge
indicator, all functions and
display indicators are
disabled.
All functions disabled.
— 4 —
Recover Indicator
If you use illumination or alarms a number of times during
a short period, the recover indicator (R) appears on the
display and the following operations become disabled until
battery power recovers.
Illumination; Beeper tone; Coordination between digital
and analog timekeeping
After some time, battery power will recover and the
recover indicator will disappear, indicating that the above
Recover indicator
functions are enabled again.
• If the battery drops to Level 3 while the recover indicator is on the display, the
Battery Level Screen will indicate
. Charge the battery as soon as possible.
• If the recover indicator appears frequently, it probably means that remaining battery
power is low. Leave the watch in bright light to allow it to charge.
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 15 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.
• Watch is not exposed to light
• Internal timekeeping
• Display on 18 hours per day, sleep state 6 hours per day
• 1 light operation (1.5 seconds) per day
• 10 seconds of alarm operation 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)
3 hours
Sunlight through a window
9 hours
(10,000 lux)
Daylight through a window on
14 hours
a cloudy day (5,000 lux)
Indoor fluorescent lighting
169 hours
(500 lux)
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
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
When turned on, Power Saving automatically enters a sleep state whenever the watch
is left for a certain period in an area where it is dark. The table below shows how
watch functions are affected by Power Saving.
• There are actually two sleep state levels: "display sleep" and "function sleep".
Elapsed Time in Dark
60 to 70 minutes
Digital display off, but all functions are enabled and the
(Display Sleep)
power saving on indicator flashes on the display
• Digital display off, but the power saving on indicator
6 or 7 days
flashes on the display
(Function Sleep)
• All functions, including analog timekeeping, disabled
• Internal timekeeping maintained
• Wearing the watch inside your sleeve can cause it to enter the sleep state.
• The watch will not enter the sleep state while the digital time is between 6:00 AM
and 9:59 PM. If the watch is already in the sleep state when the digital time reaches
6:00 AM, however, it will remain in the sleep state.
• The analog hands move to the 12 o'clock position when the watch enters the
function sleep state. If the analog time and digital time do not match after the watch
recovers from the function sleep state, adjust the analog hand setting so it matches
the digital time.
• The watch will not enter the sleep state while it is in the Stopwatch Mode.
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area. It can take up to two seconds for the display to turn
on.
• Press any button.
• Angle the watch towards your face for reading.
Approximate Exposure Time
7 minutes
24 minutes
39 minutes
7 hours
Level 3
Level 2
Level 1
54 hours
15 hours
203 hours
56 hours
328 hours
90 hours
– – –
Operation
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