Operation Guide 5239
E-19
Radio Controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly.
However, when using the watch outside of areas covered by time calibration signals,
you will have to adjust the settings manually as required. See “Confi guring Current
Time and Day Settings Manually” (page E-41) for more information.
This section explains how the watch updates its time settings when the city code
selected as the Home City is in Japan, North America, Europe, or China, and is one
that supports time calibration signal reception.
E-18
Power Saving
Power Saving enters a sleep state (second hand sleep or function sleep) whenever
the watch is left for a certain period in an area where it is dark.
Elapsed Time in Dark
Operation
60 to 70 minutes
(second hand sleep)
x
x
Second Hand
only stopped at 12 o’clock, all other functions
enabled
6 or 7 days
(function sleep)
All functions, including analog timekeeping, disabled
x
Internal timekeeping maintained
x
The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch is
x
already in a sleep state when 6:00 AM arrives, however, it will remain there.
The watch will not enter a sleep state while it is in the Stopwatch Mode.
x
To recover from the sleep state
Move the watch to a well-lit area or press any button.
E-17
Charging Times
Exposure Level (Brightness)
Daily
Operation *1
Level Change *2
Level 3
Level 2
Level 1
Outdoor sunlight (50,000 lux)
8 minutes
3 hours
28 hours
Window sunlight (10,000 lux)
30 minutes
7 hours
107 hours
Window sunlight on cloudy day
(5,000 lux)
48 minutes
10 hours
173 hours
Indoor fl uorescent lighting
(500 lux)
8 hours
114 hours
– – –
1 Approximate exposure each day to generate power for normal daily operation.
*
2 Approximate exposure to take power up one level.
*
The above times are for reference only. Actual times depend on lighting conditions.
x
For details about the operating time and daily operating conditions, see the “Power
x
Supply” section of the Specifi cations (page E-77).
E-16
When power drops to Level 3, all settings (including timekeeping) will be cleared.
x
Recharging the battery will reset all settings to their initial factory defaults.
When the watch is at Level 3, exposing it to light for a while will cause the
x
x
Second
Hand
to move to the position of second 57. This indicates that charging has started.
Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation
temporarily whenever power suddenly drops below a certain level due to continuous
signal reception or other operations over a short period. Note that all operations are
disabled while the watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal
operation after power recovers (in about 15 minutes). Putting the watch in a location
where it is exposed to light will help power to recover sooner.
E-15
Low Power
Low power conditions are indicated by the movement of
the
x
Second Hand
in the Timekeeping Mode.
If the
x
x
Second Hand
is moving normally at one-second
intervals, power is at Level 1.
If the
x
x
Second Hand
is moving at two-second intervals,
power is at Level 2, which is quite low. Expose the watch
to light as soon as possible so it can charge.
Low Battery Alert (Hand Movement and Function
Status)
Level
Hand Movement
Function Status
1
Normal.
All functions enabled
2
x
x
Second Hand
moves at
two-second intervals.
Beeper and time
calibration signal
reception disabled.
3
x
x
Second Hand
stopped.
All functions disabled
@
Moves at two-second
intervals.
E-14
If about one second elapses without any operation being performed, the
2.
x
Second
Hand
will then move to the latest time calibration signal receive operation result.
See “To check the result of the latest receive operation” (page E-29).
x
Press
3.
B
to return to regular timekeeping.
The watch will also return to regular timekeeping if you do not perform any
x
operation for about 10 seconds.
E-13
Checking the Current Power Level
You can use the procedure below to determine the watch’s current power level.
Certain functions will be disabled when the power level is low. If the power level is
low, leave the watch in a location where its face (solar panel) is exposed to light.
To check the current power level
In the Timekeeping Mode, press
1.
B
. The
x
Second Hand
will move to
H
(
High
),
M
(
Medium
), or
L
(
Low
) to indicate the power level.
H: High
M: Medium
L: Low
@
E-12
Warning!
Leaving the watch in bright light for charging can cause it to become quite hot.
Take care when handling the watch to avoid burn injury. The watch can become
particularly hot when exposed to the following conditions for long periods.
On the dashboard of a car parked in direct sunlight
x
Too close to an incandescent lamp
x
Under direct sunlight
x
Important!
Keep the watch in an area normally exposed to bright light when storing it for long
x
periods. This helps to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in
x
such a way that it is blocked from exposure to light can cause power to run down.
Make sure that the watch is exposed to bright light whenever possible.
E-11
Charging the Watch
The face of the watch is a solar panel that generates power from light. The generated
power charges a built-in rechargeable battery, which powers watch operations. The
watch charges whenever it is exposed to light.
Charging Guide
Whenever you are not
wearing the watch, be sure
to leave it in a location
where it is exposed to light.
Best charging
x
performance is achieved
by exposing the watch to
light that is as strong as
possible.
When wearing the watch,
makes sure that its face is
not blocked from light by
the sleeve of your clothing.
The watch may enter a
x
sleep state (page E-18)
if its face is blocked by
your sleeve even only
partially.
E-10
E-56
To perform an elapsed time operation
E-56
To perform lap time measurement
E-58
To recall lap data
E-59 Using the Alarm
E-60
To change the alarm time setting
E-62
To turn the alarm on or off
E-62
To stop the alarm
E-63 Adjusting Home Positions
E-65
To adjust home positions
E-67 Troubleshooting
E-76 Specifi cations