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Operation Guide 5163 (OC)
E-39
The fl ashing x
LOW
indicator at Level 3 (L) tells you that battery power is very low, and that exposure
to bright light for charging is required as soon as possible.
At Level 5 (
x C: Charge), all functions are disabled and settings return to their initial factory defaults.
Once the battery reaches Level 2 (M) after falling to Level 5 (C: Charge), reconfi gure the current time,
date, and other settings.
Display indicators reappear as soon as the battery is charged from Level 5 (
x C: Charge) to Level 2 (M).
The watch’s Home City code setting will change automatically to x TYO (Tokyo) whenever the battery
drops to Level 5 (C: Charge). With this Home City code setting, the watch is confi gured to receive the
time calibration signals of Japan. If you are using the watch in North America or Europe, or China you
will need to change the Home City code setting to match your location whenever the battery drops to
Level 5 (C: Charge).
Leaving the watch exposed to direct sunlight or some other very strong light source can cause the
x
battery power indicator to show a reading temporarily that is higher than the actual battery level. The
correct battery level should be indicated after a few minutes.
Overuse of display illumination or the beeper can cause the
x RECOV
(Recover) indicator to appear in the upper display, which indicates that
the watch is in the battery power recovery mode. Face illumination, the
alarm, the countdown timer alarm, time signals, and all hand operations are
disabled in the power recovery mode.
The watch continues to keep time internally, so regular timekeeping and
function will resume as soon as battery power recovers to normal levels,
which is indicated when the RECOV indicator disappears.
If
x RECOV appears frequently, it probably means that remaining battery
power is low. Leave the watch in bright light for some time to allow it to
charge.
Power recovery
mode indicator
E-38
Battery Power Indicator and Power Recovery Mode indicator
The battery power indicator indicates you the current status of the rechargeable battery’s power.
Level Battery Power Indicator Function Status
1 (H) All functions enabled
2 (M) All functions enabled
3 (L)
(Charge Soon Alert)
Auto and manual receive,
illumination, and beeper disabled
4 (C: Charge)
Except for timekeeping, all
functions and display indicators
disabled
5 (C: Charge) All functions disabled
Battery Power indicator
E-37
Important!
Storing the watch for long periods in an area where there is no light or wearing it in such a way that it
x
is blocked from exposure to light can cause rechargeable battery power to run down. Be sure that the
watch is exposed to bright light whenever possible.
This watch uses a special rechargeable battery to store power produced by the solar cell, so regular
x
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.
Never try to remove or replace the watch’s special battery yourself. Use of the wrong type of battery
x
can damage the watch.
All data stored in memory is deleted, and the current time and all other settings return to their initial
x
factory defaults whenever battery power drops to Level 5 (C: Charge) (page E-38) and when you have
the battery replaced.
Turn on the watch’s Power Saving function (page E-51) and keep it in an area normally exposed to
x
bright light when storing it for long periods. This helps to keep the rechargeable battery from going
dead.
E-36
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
x
resin band.
Note that charging effi ciency drops when any part of the
x
solar cell is blocked by clothing, etc.
You should try to keep the watch outside of your sleeve x
as much as possible. Charging is reduced signifi cantly
if the face is even only partially covered.
Solar cell
E-35
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.
x
Parallel to
ground
More than 40°
Warning!
xAlways 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 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.
xWhen 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 traffi c accident and serious
personal injury.
To turn the auto light switch on and off
In the Timekeeping Mode, hold down B for about three seconds to toggle the auto light switch on (auto
light switch on indicator displayed) and off (auto light switch on indicator not displayed).
The auto light switch on indicator is on the display in all modes while the auto light switch is turned on.
x
E-34
Illumination
An LED (light-emitting diode) illuminates the face of the watch for easy reading
in the dark. The watch’s auto light switch turns on illumination automatically
when you angle the watch towards your face.
The auto light switch must be turned on (indicated by the auto light switch
x
on indicator) for it to operate.
See “Illumination Precautions” (page E-54) for other important information
x
about using illumination.
To illuminate the display manually
In any mode (except a setting mode), press B to turn on the illumination for
about one second.
The above operation turns on illumination regardless of the current auto light
x
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 LED 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.
The auto light switch is always disabled, regardless of its on/off setting, when any one of the following
x
conditions exists.
While an alarm is sounding
−
While a signal receive operation is in progress −
Auto light switch
on indicator
E-33
To turn an alarm on and off
In the Alarm Mode, use 1. D to select an alarm.
Press 2. A to toggle it on (on) and off (- -).
Turning on an alarm (
x
AL1
,
AL2
,
AL3
,
AL4
or
SNZ
)
displays the alarm on indicator on its Alarm Mode screen.
In all modes, the alarm on indicator is shown for any alarm that
x
currently is turned on.
The alarm on indicator fl ashes while the alarm is sounding. x
The snooze alarm indicator fl ashes while the snooze alarm is x
sounding and during the 5-minute intervals between alarms.
To turn the Hourly Time Signal on and off
In the Alarm Mode, use 1. D to select the Hourly Time Signal (
SIG
)
(page E-31).
Press 2. A to toggle it on (on) and off (- -).
The Hourly Time Signal on indicator is shown on the display in all
x
modes while this function is turned on.
Snooze alarm indicator
ON
Alarm on indicator
Hourly time signal on indicator
E-32
After you select an alarm, hold down 2. A for about three seconds until the hour setting of the alarm time
starts to fl ash. This is the setting mode.
This operation turns on the alarm automatically.
x
Press 3. C to move the fl ashing between the hour and minute settings.
While a setting is fl ashing, use 4. D (+) and B (–) to change it.
Press 5. A to exit the setting mode.
Alarm Operation
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the watch is in. In the
case of the snooze alarm, the alarm operation is performed a total of seven times, every fi ve minutes, or
until you turn the alarm off (page E-33).
Alarm and Hourly Time Signal operations are performed in accordance with the current time in your
x
Home City, as kept in the Timekeeping Mode.
To stop the alarm tone after it starts to sound, press any button. x
Performing any one of the following operations during a 5-minute interval between snooze alarms x
cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen (page E-43)
Displaying the
SNZ
setting screen (page E-31)