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Operation Guide 3090
To select the operation of Alarm 1
1. In the Alarm Mode, use D to select Alarm 1.
2. Press A to cycle through the available settings in the sequence shown below.
Snooze alarm on indicator and one-time alarm on indicator
One-time alarm on
Snooze alarm on
• The applicable alarm on indicator is displayed in all modes when an alarm is turned
on.
• The snooze alarm on indicator flashes during the 5-minute intervals between
alarms.
• Displaying the Alarm 1 setting screen while the snooze alarm is turned on
automatically turns off the snooze alarm (making Alarm 1 a one-time alarm).
To turn the hourly time signal on and off
1. In the Alarm Mode, use D to select the Hourly Time
Signal (:00).
2. Press A to toggle it on and off.
• Turning on the Hourly Time Signal displays the hourly
time signal on indicator on its screen.
• The hourly time signal on indicator is displayed in all
modes when the Hourly Time Signal is turned on.
Hourly time signal on
indicator
Illumination
The watch has an EL (electro-luminescent) panel that
causes the entire display to glow for easy reading in the
dark. The watch's auto light switch illuminates the display
automatically 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
Auto light switch
In any mode press B to illuminate the display.
indicator
• The above operation turns on illumination regardless of
the current auto light switch setting.
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
EL Light," so the auto light switch operates only when available light is below a certain
level. It does not illuminate the display under bright light.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you at more than 40 degrees causes illumination to turn on.
• Wear the watch on the outside of your wrist.
Parallel to
ground
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 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 Timekeeping mode (except when a setting screen is on the display), hold down B
for about three 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 indicator remains in all modes while the auto light switch is
turned on.
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. Charging is reduced
significantly if the face is only partially
covered.
Important!
• Storing the watch for long periods in an area where there is no light or wearing it in
• This watch uses a special rechargeable battery to store power produced by the solar
Alarm off
• Never try to remove or replace the watch's special battery yourself. Use of the wrong
• The current time and all other settings return to their initial factory defaults whenever
• Turn on the watch's Power Saving function and keep it in an area normally exposed
Battery Power Indicator and Recover Indicator
The battery power indicator shows you the current power level of the rechargeable
battery.
• The LOW flashes on the display in the Timekeeping Mode when battery is at Level 3.
• The LOW at Level 3 and the flashing charge indicator (CHG) at Level 4 tell you that
• At Level 5, all functions are disabled and settings return to their initial factory
• Leaving the watch in direct sunlight or some other very strong light source can
• If you use the illumination or alarms a number of times during a short period, the
More than
Charging Precautions
40°
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 8 months.
• The following table shows the amount of time the watch needs to be exposed to light
Solar cell
• Since these are the specs, we can include all the technical details.
• Stable operation is promoted by frequent exposure to light.
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 exposed to bright light whenever
possible.
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.
type of battery can damage the watch.
battery power drops to Level 5 and when you have the battery replaced.
to bright light when storing it for long periods. This helps to keep the rechargeable
battery from going dead.
Level
Battery Power Indicator
1
Battery power
indicator
2
3
(Charge Soon Alert)
4
(Charge Soon Alert)
5
battery power is very low, and that exposure to bright light for charging is required as
soon as possible.
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 4
(indicated by the flashing charge indicator (CHG)) from Level 5. You will not be able
to configure any of the other settings until the battery reaches Level 3 (no charge
indicator) after dropping to Level 5.
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.
charge indicator (CHG) flashes and the following operations become disabled until
battery power recovers.
Illumination
Beeper tone
Time calibration signal reception
After some time, battery power will recover and the charge indicator (CHG) will
disappear, indicating that the above functions are enabled again.
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)
• 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
• 10 minutes of signal reception per day
Function Status
All functions enabled.
All functions enabled.
Alarm, hourly time signal,
illumination and time calibration
signal reception disabled.
All functions, including auto
light swich, disabled.
All functions, including
timekeeping, disabled and
initialized.
Approximate Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
4
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