Operation Guide 5142
ξA short while after exposing the watch to light after its battery charge has run down will cause the x Second Hand to move counterclockwise until it stops at second 57 on the face. This indicates that charging has started. See page
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 overuse of the alarm tone 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.
Charging Times
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| Level Change *2 | |||||
Exposure Level (Brightness) | Operation |
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| Level 3 | Level 2 |
| Level 1 | ||
| *1 |
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Outdoor sunlight (50,000 lux) | 8 minutes |
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| 2 hours |
| 23 hours | |||
Window sunlight (10,000 lux) | 30 minutes |
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| 6 hours |
| 87 hours | |||
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Window sunlight on cloudy day (5,000 lux) | 48 minutes |
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| 9 hours | 140 hours | ||||
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Indoor fluorescent lighting (500 lux) | 8 hours |
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| 94 hours |
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*1 Approximate exposure each day to generate power for normal daily operation.
*2 Approximate exposure to take power up one level.
ξThe above times are for reference only. Actual times depend on lighting conditions.
ξFor details about the operating time and daily operating conditions, see the “Power Supply” section of the Specifications (page
Power Saving | To recover from the sleep state |
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.
ξThere actually are two sleep state levels: “second hand sleep” and “function sleep”.
Elapsed Time in Dark | Operation |
60 to 70 minutes (second hand | x Second Hand only stopped, all other functions |
sleep) | enabled |
ξAll functions, including analog timekeeping, disabled
6 or 7 days (function sleep) ξ World Time Mode time stopped at the point the
Timekeeping Mode time reached 0:00
Move the watch to a
ξThe 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.
ξThe watch will not enter a sleep state while it is in the Stopwatch Split Mode, Stopwatch Lap Mode, or Countdown Timer Mode.
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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 Date Settings Manually” (page
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.
If your Home City Code setting is this: | The watch can receive the signal from | |
the transmitter located here: | ||
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LON (LONDON), PAR (PARIS), ATH (ATHENS) | Anthorn (England), Mainflingen | |
(Germany) | ||
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HKG (HONG KONG) | Shangqiu City (China) | |
TYO (TOKYO) | Fukushima (Japan), Fukuoka/Saga | |
(Japan) | ||
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HNL (HONOLULU), ANC (ANCHORAGE), |
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LAX (LOS ANGELES), DEN (DENVER), | Fort Collins, Colorado (United States) | |
CHI (CHICAGO), NYC (NEW YORK) |
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Important!
ξThe areas covered by HNL (HONOLULU) and ANC (ANCHORAGE) are quite far from the calibration signal transmitters, so certain conditions may cause reception problems.
ξWhen HNL (HONOLULU) or HKG (HONG KONG) is selected as the Home City, only the time and date are adjusted according to the time calibration signal. You need to switch manually between standard time and daylight saving time (DST) if required. See “To toggle the Home City time between standard time and daylight saving time” (page
Approximate Reception Ranges
UK and German Signals
Anthorn
500 kilometers
1,500 kilometers
Mainflingen
The Anthorn signal is receivable within this area.
North American Signal
2,000 miles
(3,000 kilometers)
600 miles (1,000 kilometers)
Fort Collins
Japanese Signals | Chinese Signal | |
Fukushima | 500 kilometers | Changchun |
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500 kilometers |
| Beijing |
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Fukuoka/Saga |
| Shangqiu |
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| Shanghai |
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| Chengdu |
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| Hong Kong |
1,000 kilometers |
| 1,500 kilometers |
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ξEven when the watch is within range of a transmitter, signal reception may be impossible due to the effects of geographic contours, structures, weather, the time of year, the time of day, radio interference, etc. The signal becomes weaker at distances of approximately 500 kilometers, which means that the influence of the conditions listed above becomes even greater.
ξSignal 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)
ξAs of December 2010, 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.
ξUsing 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 daylight saving time (summer time), etc.