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Operation Guide 3379
3
Illumination
An LED (light-emitting diode) and light guide panel
illuminate the digital display areas for easy reading in the
dark. The watch’s auto light switch automatically
illuminates the digital display areas when you angle the
watch towards your face.
• The auto light switch must be turned on (indicated by
the auto light switch indicator) for it to operate.
• See “Illumination Precautions” for other important
information.
To turn on illumination manually
In any mode, press L to illuminate the digital display
areas.
• You can specify 1.5 seconds or 2.5 seconds as the
illumination duration. See “To set the digital time and
date” for more information.
• The above operation turns on illumination regardless of
the current auto light switch setting.
Auto light switch
indicator
About the Auto Light Switch
Turning on the auto light switch causes illumination to turn on whenever you position
your wrist as described below in any mode. Note that this watch features a “Full Auto
Light,” so the auto light switch operates only when available light is below a certain
level. It does not illuminate the digital display areas 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 illumination to turn on.
• Wear the watch on the outside of your wrist.
Parallel to
ground
More than
40°
Warning!
• Always make sure you are in a safe place whenever you are reading 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 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.
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
(Charge Soon Alert)
l
l
l
l
l
l
l
l
l
l
l
l
Battery power indicator
Recover indicator
• 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
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
4 minutes
19 minutes
29 minutes
5 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
• Stable operation is promoted by frequent charging.
Charging Guide
After a full charge, timekeeping remains enabled for up to about 12 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
35 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
10 hours
109 hours
▲
– – –
19 hours
94 hours
152 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
puts the watch into a sleep state whenever it 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.
Power saving
indicator
• Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
• The watch will not enter the sleep state between 6:00 AM and 10:59 PM. If the
watch is already in the sleep state when 6:00 AM arrives, however, it will remain in
the sleep state.
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.
Elapsed Time in Dark
60 to 70 minutes
6 or 7 days
Functions
• LCD off
• Alarm, hourly time signal, and analog timekeeping
• LCD off, alarm and hourly time signal disabled
• Analog timekeeping stopped at 12 o’clock