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2422-5
Parallel to
ground
More
than
40
°
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.
Warning!
• Always make sure you are in a safe place whenever you are
reading the display of the watch. Be especially careful when
running, riding a bicycle or motorcycle, driving a car, 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 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 ( displayed) and off ( not
displayed).
• The auto light switch on indicator ( ) is on the display in all
modes while the auto light switch is turned on.
BATTERY
This watch is equipped with a solar cell and a
storage battery that is charged by the
electrical power produced by the solar cell.
• The area outside of the LCD digital area is a
solar cell panel that picks up available light
to charge the storage battery.
Important!
• Storing the watch for long periods in an area
where there is no light or wearing it in such
a way so that the solar cell panel is blocked
from exposure to light can cause the
storage battery power to run down. Make
sure that the watch is exposed to light
whenever possible.
• This watch employs a solar cell, which converts light into electricity
that charges a built-in storage battery. Normally, the storage battery
should not need replacement, but after very long use over a number of
years, the storage battery may lose its ability to achieve a full charge.
Should you notice problems with getting the storage battery to a full
charge, contact the dealer or store where you purchased the watch
about having the storage battery replaced.
• The storage battery should be replaced with a CASIO-specified
ML-2016 battery only. Use of other storage batteries can damage the
watch.
• Be sure to put the watch into its Sleep Mode and keep it in an area
normally exposed to light when storing it for long periods. This helps to
keep the storage battery charged.
Solar cell panel
Battery power indicator
Battery Power Indicator
The battery power indicator on the display shows you the current status
of storage battery power.
Level
1
2
3
4
5
Indicator Function Status
All functions enabled.
All functions enabled.
All functions enabled.
Alarms, Hourly Time Signal, backlight,
display disabled; timekeeping enabled
Alarms, Hourly Time Signal, backlight,
display, timekeeping disabled
• At Level 4, the display is disabled but timekeeping and other functions
continue to operate internally. The CHARGE indicator flashes to
indicate that battery power is about to go too low to support
timekeeping and data storage. Whenever the battery power indicator
shows Level 4, leave the watch in a location where it is exposed to
light so the storage battery can be charged.
• At Level 5, all functions are disabled. Functions are re-enabled after
the storage battery is charged, but anything previously stored in
memory is lost. Because of this, you must set the current time and
alarms, and re-input Identification Mode data after the storage battery
is re-charged.
• Leaving the watch in direct sunlight or under some other very strong
light source can cause the battery power indicator to temporarily show
a reading that is actually higher than the battery level. The correct
battery power indicator should appear after a short while.
• Frequent backlight and alarm operations over a short period put a
heavy load on the battery, which can cause the indicator (RECOVER)
to appear, indicating that the backlight and alarm are disabled. Normal
operations should return after the battery recovers from the overload
condition. The above condition can occur after about 200 consecutive
backlight operations or about 360 consecutive alarm operations.
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 storage battery.
Warning!
Leaving the watch in sunlight to charge its storage battery can
cause it to become quite hot. Take care when handling the watch to
avoid burn injury.
• On the dashboard of a car parked in direct sunlight
• Too close to an incandescent lamp
• Under direct sunlight or in any other area exposed to intense heat for
long periods
Charging Guide
The following are required charge times when the backlight is used for
two seconds and the alarm sounds for 20 seconds per day:
• Approximately 8 hours of 500 lux (indoor fluorescent lighting) per day
• Approximately 1 hour 15 minutes of 3,000 lux (direct fluorescent
lighting) per day
• Approximately 50 minutes of 36,000 lux (afternoon outdoor sunlight)
per week
Sleep Mode
When the Sleep Mode is turned on, the display of the watch turns off
automatically to conserve battery power when you leave it in an area
where lighting is dim for about seven or eight days without performing
any button operation.
• Timekeeping and other functions continue to be performed internally
while the watch is in the Sleep Mode.
• Alarms, the Hourly Time Signal, and the backlight are disabled while
the watch is in the Sleep Mode.
• Moving the watch to a brightly lit area or pressing any of the watch
buttons recovers from the Sleep Mode and enters the Timekeeping
Mode.
• The watch does not enter the Sleep Mode while battery power is at
Level 4.
To turn the Sleep Mode on and off
1. In the Timekeeping Mode, hold down A
until the second’s digits start to flash.
2. Press C nine times to move the flashing to
the Sleep Mode On/Off setting.
3. Press D to toggle the Sleep Mode on
(O ) and off (OFF).
4. Press A to exit the setting screen.
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.
Graphic Area and Text Area
• The graphic area shows the passage of
minutes in the Timekeeping, Dive Time
Measurement, Site, Countdown Timer, and
Stopwatch Modes, and the Log Data
screen. A segment appears in the graphic
area each time five minutes pass.
• The text area can show up to four
characters, so longer text scrolls continually
from right to left.
Text area
Graphic area
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