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Operation Guide 5640
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 “Configuring Current
Time and Date Settings Manually” (page E-44) 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
x The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch
is already in a sleep state when 6:00 AM arrives, however, it will remain in the sleep
state.
x The watch will not enter a sleep state while it is in the Stopwatch Mode or
Countdown Timer Mode.
To recover from the sleep state
Move the watch to a well-lit area, press any button, or angle the watch towards your
face for reading (page E-65).
E-17
x For details about the operating time and daily operating conditions, see the “Power
Supply” (page E-87) section of the Specifications.
Power Saving
When enabled, Power Saving enters a sleep state automatically whenever the watch
is left for a certain period in an area where it is dark. The table below shows how
watch functions are affected by Power Saving.
x For information about enabling and disabling power saving, see “To enable or
disable Power Saving” (page E-77).
x There actually are two sleep state levels: “display sleep” and “function sleep”.
Elapsed Time in Dark Digital Displays Operation
60 to 70 minutes (display sleep) Blank
Digital display is disabled, but all
functions are enabled.
6 or 7 days (function sleep) Blank
Hour and minute hands stop at
12o’clock. All functions are disabled,
but timekeeping is maintained.
E-16
Charging Times
Exposure Level
(Brightness)
Daily
Operation
*1
Level Change *2
Level 5 Level 4 Level 3 Level 2 Level 1
Outdoor sunlight
(50,000 lux)
8 min. 4 hours 38 hours 10 hours
Window sunlight
(10,000 lux)
30 min. 11 hours
142 hours
38 hours
Window sunlight on
cloudy day (5,000 lux)
48 min. 17 hours
230 hours
62 hours
Indoor fluorescent
lighting (500 lux)
8 hours 225 hours – – – – – –
* 1 Approximate exposure each day to generate power for normal daily operation.
* 2 Approximate exposure time (in hours) required to take power up one level.
x The above exposure times all are for reference only. Actual exposure times depend
on lighting conditions.
E-15
Power Recovery Mode
x Performing multiple illumination, beeper, and/or high-speed hand movement
operations during a short period may cause all of the battery power indicators
(H, M, and L) to start flashing. This indicates that the watch is in the power
recovery mode. Illumination, alarm, countdown timer alarm, and hourly time signal
operations will be disabled until battery power recovers.
x Battery power will recover in about 15 minutes. At this time, the battery power
indicators (H, M, L) will stop flashing. This indicates that the functions listed above
are enabled again.
x If all of the battery power indicators (H, M, L) are flashing and the CHG (charge)
message also is flashing, it means the battery level is very low. Expose the watch
to bright light as soon as possible.
x Frequent flashing of all of the battery power indicators (H, M, L) probably means
that remaining battery power is low. Leave the watch in bright light to allow it to
charge.
E-14
x At Level 5, all functions are disabled and settings return to their initial factory
defaults. Once the battery reaches Level 2 (M) after falling to Level 5, reconfigure
the current time, date, and other settings.
x Display indicators reappear as soon as the battery is charged from Level 5 to
Level 2 (M).
x Leaving the watch exposed to direct sunlight or some other very strong light
source can cause the 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.
x The current time and all other settings return to their initial factory defaults
whenever battery power drops to Level 5 and when you have the battery replaced.
E-13
Level
Battery Power Indicator
Function Status
1
(H)
All functions enabled.
2
(M)
All functions enabled.
3
(L and
LOW)
Auto and manual receive, illumination, and beeper
disabled.
Except for Timekeeping Mode, all other modes
disabled.
4
(CHG)
All functions and display indicators disabled except
for timekeeping and display of the CHG (charge)
indicator.
Hour and minute hands stopped at 12 o’clock.
5
All functions disabled.
x The flashing LOW message 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.
E-12
Power Levels
You can get an idea of the watch’s power level by observing the battery power
indicator.
Battery power indicator
E-11
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.
x On the dashboard of a car parked in direct sunlight
x Too close to an incandescent lamp
x Under direct sunlight
Important!
x Allowing the watch to become very hot can cause the digital displays to black out.
The appearance of the LCD should become normal again when the watch returns
to a lower temperature.
x Enable the watch’s Power Saving function (page E-17) and keep it in an area
normally exposed to bright light when storing it for long periods. This helps to
ensure that power does not run down.
x Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause power to run down.
Expose the watch to bright light whenever possible.
E-10
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, leave
it in a location where it is
exposed to light.
x Best charging
performance is achieved
by exposing the watch
to the strongest light
available.
When wearing the watch,
make sure that its face is
not blocked from light by
the sleeve of your clothing.
x The watch may enter a
sleep state (page E-17) if
its face is blocked by your
sleeve even only partially.
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