G-Shock GW-900BJ-4 - Manual (Page 2)

Operation Guide 2839
2
The power supply of this watch uses a solar cell to generate
electrical power, which is stored by a rechargeable battery. Using
or storing the watch where it is not regularly exposed to light, or
allowing it to be blocked from light by your sleeve as you are
wearing it can cause the power of the rechargeable battery to run
down. To ensure stable operation, be sure to allow the watch to be
exposed to light as much as possible when you are wearing or
storing it.
Note that all data in memory and all settings are cleared
whenever you allow the level of the rechargeable battery to
drop to Level 4.
❚ Flashing Recover Indicator
If you use the light or alarms a number of times during a short
period, a RECOVER indicator flashes on the display and the
following operations become disabled as battery power recovers.
• Display illumination
• Alarm and hourly time signal
• Time calibration signal reception
Normal operation will return after the battery recovers.
RECOVER Indicator
Battery Level Indicator
Power Supply
❚ Battery Indicator
Normal operation enabled.
Normal operation enabled.
Display, display illumination, tones
(alarms, hourly time signal), and
signal reception disabled.
All functions, including timekeeping,
disabled.
Level 1
Level 2
Level 3
Level 4 (Off)
• Exposing the watch to direct sunlight or other strong light may
cause the battery level indicator to momentarily indicate a level
that is higher than the actual battery level. Because of this, you
should wait for a short while after charging to check the battery
level indicator.
• Even if battery power drops to Level 4, normal operation will
return after the battery recovers.
• After the battery drops to Level 4, the display will turn back on
after it recovers to Level 3. However, you should keep the watch
exposed to light until the battery reaches Level 2 or Level 1 before
using the watch.
❚ Start charging at Level 3!
Battery Level 3 indicates that remaining battery power is very low.
Be sure to expose the watch to light for recharging as soon as
possible after the Level 3 indicator starts to flash.
❚ Charging Precautions
Avoid charging the watch in the following locations, and anywhere
else where the watch may become very hot.
• On the dashboard of an automobile parked in the sun
• Very close to an incandescent light source or other sources of heat
• In a location exposed to direct sunlight for long periods
Note that the display panel may become black under very high
temperatures. This is temporary, and the display will appear
normal again at lower temperatures.
Depending on the light source you are using, the
case of the watch may become quite hot during
charging. Take care to guard against burn injury after
charging.
❚ To charge the battery
Point the solar panel (display) of the watch at a light source.
• Remember that even a partial blockage of the solar cell reduces
charging efficiency.
Example: Positioning the watch
Solar Cell
• The illustration shows the resin band model.
❚ Charging Guide
Starting from a full charge, the watch
should be able to continue operating
for about six months without further
charging under the conditions
described below.
Daily Use (All time values are
approximate.)
• Display Illumination: 1.5
seconds
• Alarms: 10 seconds
• Signal reception: 4 times
• Display: 18 hours
Make sure the watch is regularly
exposed to light ensure stable
operation.
• Charge Times Required to Advance to a Higher Level
Approximate Exposure Time
Level 4 \ Level 3 \ Level 2 \ Level 1
– – – – – –
1 hour 3 hours 14 hours
3 hours
5 hours
57 hours
14 hours 70 hours
28 hours 143 hours
Exposure Level
(Brightness)
Outdoor Sunlight
(50,000 lux)
Daylight Through a Window
on a Cloudy Day (5,000 lux)
Indoor Fluorescent
Lighting (500 lux)
Sunlight Through a
Window (10,000 lux)
• Note that the above charging times are for reference only. Actual
charging time depends on a variety of environmental factors.
Required Daily Charging Time
• The following is the daily
amount of charging required
each day to support the
operations under “Daily Use”.
Exposure Level
(Brightness)
Outdoor Sunlight
(50,000 lux) 5 minutes
24 minutes
48 minutes
8 hours
Approximate
Exposure
Time
Sunlight Through
a Window
(10,000 lux)
Daylight Through a
Window on a Cloudy
Day (5,000 lux)
Indoor
Fluorescent
Lighting (500 lux)
Display Illumination
An EL (electro luminescent) panel is used to illuminate the display
of the watch for easy reading in the dark. An auto light switch
automatically illuminates the display when you angle the watch
towards your face for reading.
❚ To illuminate the display manually
When any screen besides a
setting screen (one with a
flashing setting), press the
L L L L L button to illuminate the
display.
• The display remains illuminated for
about 1.5 seconds.
• Pressing the L button illuminates the display regardless of
whether the auto light switch is on or off.
You may hear a faint rattling sound when you move the watch
around. This sound is caused by the movement of a metal
bulb that controls operation of the auto light switch, and does
not indicate malfunction.
Illuminating the Display with the
Auto Light Switch
The full auto light switch automatically illuminates the display
whenever you angle the watch towards your face for reading,
but only when it is dark.
• The full auto light switch does not illuminate the display
when surrounding light is bright.
The auto light switch is very handy for reading the watch
display in the dark. The auto light switch illuminates the
display for 1.5 seconds in all modes when you angle the
watch towards your face.
❚ To turn on the auto light switch
In the Timekeeping Mode, hold down the L button for about two
seconds to toggle the auto light switch on (auto light switch on
indicator displayed) and off (no indicator displayed).
Auto light switch
on Indicator
❚ To illuminate the display
1 2
With the watch on your
wrist, position it parallel
with the ground. Rotate your arm so the watch
is angled at about 40 degrees,
so you can read its display.
At least
40
°
• You should be wearing the watch on the outside of your wrist
when using the auto light switch.
• Make sure that the left (9 o’clock) and right
(3 o’clock) sides of the watch are within
± 15
degrees of being parallel with the ground.
The auto light switch may not operate
properly if the angle is greater.
Display Illumination Precautions
• The light may be difficult to see if you turn it on under bright
sunlight.
• If you press the L button or if an alarm operation starts while the
display is illuminated, illumination will turn off.
• You may notice a slight sound from the watch while the display is
illuminated. This is the sound of EL panel vibration, and does not
indicate malfunction.
Auto Light Precautions
• Frequent use of the auto light can run down the battery.
• The auto light switch may turn on illumination when the display of
the watch is shaded by your sleeve.
• Illumination may not turn on immediately when you angle the
watch towards your face. This does not indicate malfunction.
• Illumination remains turned on for about 1.5 seconds only, even if
you leave the watch angled towards your face.
• The display may illuminate unintentionally when you wear the
watch on the inside of your wrist, when you shake your arm, or
when you raise your arm. Be sure to turn off the auto light switch
whenever you do not need display illumination.
• Keep the auto light switch turned off whenever you are wearing
the watch on the inside of your wrist.
• Electro-static charge and magnetism can interfere with auto light
operation and even make operation impossible. If this happens,
lower your arm to the starting position and then raise it again. If
you still have trouble with display illumination, try lowering your
arm down to your side and then raise it to your face for reading.