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Power Supply
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 for long periods
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.
Important!
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 alarm a number of times during a short
period, a recover (RECOV) 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
Display Illumination
An EL (electroluminescent) 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 eyes for reading.
❚ To illuminate the display manually
Press the L
L
L
L button in any
L
mode to illuminate the display
of the watch.
• You can use the procedure under
"To specify the illumination
duration" to select either
1.5 seconds or 2.5 seconds for
the illumination duration.
• 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.
Operation Guide 2914
Battery Level Indicator
Black-On-
White-On-
White
Black
Level 1
Normal operation enabled.
Level 2
Normal operation enabled.
Digital display, illumination, alarms,
Level 3
tones (alarms, hourly time signal),
and signal reception disabled.
All functions, including timekeeping,
Level 4
disabled.
• Exposing the watch to direct sunlight or other strong light may cause
the battery level indicator to indicate a level momentarily 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 after the battery drops to Level 4, you will be able to resume
normal operation by charging the battery.
• When charging from Level 4, the display will start operating when
the battery reaches Level 3. At this time you will be able to
configure time and date settings, but you should keep the watch
exposed to light until the battery reaches Level 2 or Level 1.
❚ 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.
❚ To illuminate the display with the auto
light switch
The auto light switch automatically illuminates the display
whenever you angle the watch towards your eyes for reading,
but only when it is dark.
• The auto light switch does not illuminate the display when
surrounding light is bright.
You can use the procedure under "To specify the illumination
duration" to configure the illumination duration as approxi-
mately 1.5 seconds or 2.5 seconds.
❚ To turn the auto light switch on and off
While a setting screen (one on which a setting is flashing) is on the
display, 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
❚ 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.
❚ Positioning Your Arm Correctly
1 1 1 1 1
2 2 2 2 2
With the watch on
Rotate your arm so the watch
your wrist, position it
is angled at about 40 degrees,
level with the ground.
so you can read its display.
• 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.
Important!
• The light may be difficult to see if you turn it on under bright
sunlight.
• If you press any button or if an alarm operation starts while the
display is illuminated, illumination will turn ofφ.
• Display illumination does not work while you are performing a time
calibration signal manual receive operation.
• You may hear humming sound from the watch while the display is
illuminated. This is caused by vibration of the EL panel used of
.
illumination, and does not indicate malfunction
❚ Charging Guide
Required Daily Charging Time
• The following is the daily
Starting from a full charge, the watch
amount of charging required
should be able to continue operating
each day to support the
for about eight months without
operations under "Daily Use".
further charging under the conditions
described below.
Exposure Level
(Brightness)
Daily Use (All time values are
approximate.)
Outdoor Sunlight
• Display Illumination: 1.5 seconds
(50,000 lux)
• Alarm: 10 seconds
Sunlight Through
• Signal reception: 16 minutes
a Window
• Display On: 18 hours
(10,000 lux)
Daylight Through a
Making sure the watch is regularly
Window on an Overcast
exposed to light ensures stable
Day (5,000 lux)
operation.
Indoor
Fluorescent
Lighting (500 lux)
• Charge Times Required to Advance to a Higher Level
Approximate Exposure Time
Exposure Level
(Brightness)
\
\
Level 4
Level 3
Level 2
Outdoor Sunlight
2 hours
22 hours
(50,000 lux)
Sunlight Through a
5 hours
109 hours
Window (10,000 lux)
Daylight Through a Window on
9 hours
222 hours
an Overcast Day (5,000 lux)
Indoor Fluorescent
101 hours
– – –
Lighting (500 lux)
• Note that the above charging times are for reference only. Actual
charging time depends on a variety of environmental factors.
Auto Light Precautions
• Frequent use of the auto light can run down the battery.
• The auto light switch may cause the display to illuminate when
your sleeve covers the display of the watch.
• The display may not illuminate immediately when you angle the
watch towards your face. This does not indicate malfunction.
• The display remains illuminated for the currently set duration (1.5
or 2.5 seconds) only, even if you leave the watch angled towards
your face.
• The auto light switch is automatically disabled whenever battery
At least
power is at Level 3 or loweρ.
40
• The display may illuminate unintentionally when you wear the
degrees
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 illumination, try lowering your arm down
to your side and then raise it to your face for reading.
Approximate
Exposure
Time
5 minutes
24 minutes
48 minutes
8 hours
\
Level 1
6 hours
30 hours
61 hours
– – –
2
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