Operation Guide 4329
2
• When wearing the watch, try to keep your sleeve from blocking its
face, where the solar cell is located.
Charging efficiency is significantly reduced even if the face of the
watch is only partially covered by your sleeve.
Solar Charging
Your watch runs on electrical power generated from light and
stored by a chargeable battery.
To ensure stable operation, make sure that the solar cell of the
watch is exposed to light as much as possible.
• Whenever you are not wearing the watch on your wrist, position it
so the face (solar cell) is pointed in the direction of a source of
bright light.
Light
Solar Cell
Leave the watch under fluorescent lighting, near a window, etc.
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
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.
• How the solar cell and battery work
When exposed to light
Light
Solar cell
Electrical energy
Rechargeable
battery
Power supplied
to watch
Charge
When not exposed to light
Discharge
Power supplied
to watch
Rechargeable
battery
Your watch continues to operate, even when it is not exposed to
light. Leaving the watch in the dark can run down its battery and
cause functions to become disabled.
Normal Operation
1-second movement
When the date
indicator changes to 1
(which is the home
position) at midnight, it
means that battery
power is low and
charging is required.
The second, hour, and
minute hands all stop
at 12 o’clock.
Important!
The following functions are
disabled when battery power
is low.
• Auto receive and manual
receive
• Alarm beeper
Disabled State
Low Battery Alert
Jumps 2 seconds
Home
Position
When battery runs low
If power drops even more...
Hands Stop at 12 O’clock
Low Battery Alert
When secondary battery power is low, the second hand of the
watch will start to jump at 2-second intervals to let you know that
charging is required.
• Even if the battery level drops to the point that timekeeping stops,
you still will be able to recharge the battery and use the watch
again.
• After you recharge the battery after it drops to a level where
timekeeping stops, the hands will move automatically to the
current time setting.
• Try to keep the watch exposed to light as much as possible during
normal use.
Charge Times Required to Advance to a Higher Level
1 hour 21 hours
Exposure Level
(Brightness)
Approximate Exposure Time
Until Hand
Movement Restarts
Until Full Charge
Outdoor Sunlight
(50,000 lux)
2 hours 77 hours
Sunlight through a
Window (10,000 lux)
4 hours - - -
Overcast Daylight through
a Window (5,000 lux)
35 hours - - -
Indoor Fluorescent
Lighting (500 lux)
• Note that the above charging times are for reference only. Actual
charging time depends on a variety of environmental factors.
Charging Guide
Required Charging Time for One Day of Operation
• Based on six minutes of signal reception and 10 seconds of alarm
per day.
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Approximate
Exposure Time
Sunlight through a Window (10,000 lux)
Overcast Daylight through a Window (5,000 lux)
Indoor Fluorescent Lighting (500 lux)
8 minutes
30 minutes
48 minutes
8 hours
Making sure the watch is exposed to light regularly ensure stable
operation.
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