Operation Guide 5654
E-15
To get ready for a receive operation
1. Enter the Timekeeping Mode (page E-24).
x You could also enter the World Time Mode to perform this procedure.
Time calibration reception is based on the applicable mode’s city setting. In the Timekeeping Mode,
the city setting is the Home City. In the World Time Mode, it is the World Time City (page E-28).
2. Place the watch in a location where signal reception is good.
x Position the watch as shown in the nearby
illustration, with 12 o’clock pointed towards a
window. Make sure there are no metal objects
nearby.
x Signal reception normally is better at night.
x The receive operation takes from two to 10 minutes,
but in some cases it can take as long as 20 minutes.
Take care that you do not perform any button
operation or move the watch during this time.
12 o’clock
or
E-14
x Signal reception may not be possible at the distances noted below during certain times of the year or
day. Radio interference may also cause problems with reception.
- Mainflingen (Germany) or Anthorn (England) transmitters: 500 kilometers (310 miles)
- Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)
- Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles)
- Shangqiu (China) transmitter: 500 kilometers (310 miles)
x As of January 2020, China does not use Daylight Saving Time (DST). If China does go to the Daylight
Saving Time system in the future, some functions of this watch may no longer operate correctly for the
China time zones.
x Using this watch in a country covered by a time calibration signal that is different from the countries it
supports may result in incorrect time indication due to local application of summer time, etc.
E-13
Approximate Reception Ranges
Japanese Signals Chinese Signal
Fukushima
500 kilometers
1,000 kilometers
Fukuoka/Saga
1,500 kilometers
Changchun500 kilometers
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
UK and German Signals North American Signal
Anthorn
500 kilometers
1,500 kilometers
Mainflingen
The Anthorn signal is receivable
within this area.
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
E-12
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-32) for more
information.
x Time calibration signal reception is enabled while the watch is in the Timekeeping Mode or World Time
Mode. In this manual, all examples show time calibration signal reception in the Timekeeping Mode.
The same procedures apply while the watch is in the World Time Mode.
x Time calibration reception is based on the applicable mode’s city setting. In the Timekeeping Mode,
the city setting is the Home City. In the World Time Mode, it is the World Time City (page E-28).
This section explains how the watch updates its time settings when the city setting is a city in Japan,
North America, Europe, or China, and is one that supports time calibration signal reception.
If the city setting is this:
The watch can receive the signal from the transmitter
located here:
LONDON (LON), PARIS (PAR), ATHENS (ATH) Anthorn (England), Mainflingen (Germany)
HONG KONG (HKG) Shangqiu City (China)
TOKYO (TYO) Fukushima (Japan), Fukuoka/Saga (Japan)
NEW YORK (NYC), CHICAGO (CHI),
DENVER (DEN), LOS ANGELES (LAX),
ANCHORAGE (ANC), HONOLULU (HNL)
Fort Collins, Colorado (United States)
Important!
x Though the Honolulu and Anchorage areas (time zones) are outside of the time signal reception range
of the watch, reception may be possible when reception conditions are good.
E-11
Power Saving
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 There actually are two sleep state levels: “second hand sleep” and “function sleep”.
Elapsed Time in Dark Operation
60 to 70 minutes (second hand sleep)
Only the 2
Second Hand will stop at its current position.
6 or 7 days (function sleep)
x All hands stopped at 12 o’clock.
x Only day indication operates normally.
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 while an elapsed time
operation is in progress in the Timekeeping Mode or the World Time Mode.
To recover from the sleep state
Move the watch to a well-lit area, perform a crown operation, or press any button.
E-10
x When the watch is at Level3, exposing it to light for a while will cause the
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 15minutes). Putting the watch in a location where it is exposed to light will help
power to recover sooner.
Charging Times
Exposure Level (Brightness)
Daily
Operation *1
Level Change *2
Level 3 Level 2 Level 1
Outdoor sunlight (50,000 lux) 8 minutes 2 hours 23 hours
Window sunlight (10,000 lux) 30 minutes 6 hours 84 hours
Window sunlight on cloudy day (5,000 lux) 48 minutes 8 hours 136 hours
Indoor fluorescent lighting (500 lux) 8 hours 94 hours – – –
* 1 Approximate exposure each day to generate power for normal daily operation.
* 2 Approximate exposure to take power up one level.
x 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 Supply” section of
the Specifications (page E-49).
E-9
Important!
x Keep the watch 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. Make sure that the watch is exposed
to bright light whenever possible.
Power Levels
You can get an idea of the watch’s power level by observing the movement
of the
Second Hand.
x If the
Second Hand is moving normally at one-second intervals, power
is at Level 1.
x If the
Second Hand is moving at two-second intervals, power is at
Level2, which is quite low (Low battery alert). Expose the watch to light
as soon as possible so it can charge.
Level Hand Movement Function Status
1 Normal. All functions enabled
2
2
Second Hand moves at
two-second intervals.
Time calibration signal reception and
home position adjustment disabled
3 All hands stopped at 12o’clock. All functions disabled
x When power drops to Level3, all settings (including timekeeping) will be
cleared. Recharging the battery will reset all settings to their initial factory
defaults, so you will need to configure settings again.
30
Moves at two-second
intervals.
2
E-8
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.
x Best charging
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.
x The watch may enter a
sleep state (page E-11) if
its face is blocked by your
sleeve even only partially.
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
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