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To turn on the backlight manually
In any mode, press L to illuminate the display for about two seconds.
• The above operation turns on the backlight regardless of the current
auto light switch setting.
About the Auto Light Switch
Turning on the auto light switch causes the backlight 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
turn on the backlight under bright light.
• Be sure to wear the watch on the outside of your left wrist while using
the auto light switch.
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 using the auto light switch. 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 surprise or distract others around you.
To turn the auto light switch on and off
In the Timekeeping Mode, hold down D for two seconds to turn 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.
• Frequent use of the auto light switch greatly reduces the charge of the
storage battery. If you use the auto light switch often, be sure to leave
the watch where it is exposed to sunlight during the daytime so it can
recharge the storage battery. 10 minutes exposure to sunlight provides
enough of a charge for about 10 to 20 auto light switch operations.
More
than
40°
Parallel to
ground
D
L
A
B
C
Battery power indicator
Solar cell panel
Battery Power Indicator
The battery power indicator on the display shows you the current status
of the storage battery’s 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.
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 storage battery power to run down. Be sure that the watch is
normally exposed to light whenever possible.
• This watch employs a solar cell that 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 your dealer or CASIO distributor about having the storage
battery replaced.
• The storage battery should be replaced with a CASIO-specified ML-2016
battery only. Other storage batteries can cause damage to the watch.
• Be sure to put the watch into its Sleep Mode and keep in an area
normally exposed to light when storing it for long periods. This helps to
keep the storage battery from going dead.
• At Level 4, the display is disabled but timekeeping and other functions
continue to operate internally. Pressing any button causes the
Timekeeping Mode screen to appear for two or three minutes.
• At Level 5, all functions are disabled. Functions are enabled once again
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 Data Bank records after the storage battery is charged.
• 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 actually higher than the battery level. The correct
battery power indicator should appear after a few minutes.
• Frequent backlight and alarm operations over a short period put a
heavy load on the battery, which can cause the battery power indicator
to flash, 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 consecutive 200
backlight operations or about 360 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
D
A
B
C
Sleep Mode indicator
Sleep Mode
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 (7 minutes per day)
The following are required charge times when the backlight is used for
30 seconds and the alarm sounds for 20 seconds per day:
• Approximately 4 hours of 3,000 lux (direct fluorescent lighting) per day
• Approximately 2 hours 20 minutes of 36,000 lux (afternoon outdoor
sunlight) per week (20 minutes per day)
To enter the Sleep Mode
In any mode (except while figures are flashing
on the display for input), hold down C for
about two seconds.
• This enters the Sleep Mode, which causes
all figures (except Sleep Mode indicator) to
disappear from the display. Timekeeping
and other functions continue to be
performed internally, however.
• Alarms, the Hourly Time Signal, and the
backlight are disabled while the watch is in
the Sleep Mode.
• Pressing any button (except A) exits the
Sleep Mode and enters the Timekeeping
Mode.
BATTERY
This watch is equipped with a solar cell and a
storage battery (secondary 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.
• A Sleep Mode is provided to conserve
battery power.