Operation Guide 5235 (OC)
Important!
ξKeep 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.
ξStoring 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 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.
Power Levels
Moves at
You can get an idea of the watchÕs power level by observing the movement of the x Second Hand.
ξIf the x Second Hand is moving normally at
ξIf the x Second Hand is moving at
Level | Hand Movement | Function Status | |
1 | Normal. | All functions enabled | |
2 | x Second Hand moves at | Time calibration signal | |
v Day Indicator changes to 1 (home position). | reception disabled | ||
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3 | x Second Hand stopped. | All functions disabled | |
z Hour Hand and c Minute Hand stopped at | |||
| 12 o’clock. |
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Charging Times
| Daily |
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| Level Change *2 |
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Exposure Level (Brightness) |
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| Level 3 |
| Level 2 |
| Level 1 | |||
Operation *1 |
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Outdoor sunlight (50,000 lux) | 8 minutes |
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| 3 hours |
| 30 hours | |||
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Window sunlight (10,000 lux) | 30 minutes |
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| 7 hours |
| 111 hours | |||
Window sunlight on cloudy day (5,000 lux) | 48 minutes |
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| 11 hours |
| 178 hours | |||
Indoor fluorescent lighting (500 lux) | 8 hours |
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| 120 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
ξWhen power drops to Level 3, all settings (including timekeeping) will be cleared. Recharging the battery will reset all settings to their initial factory defaults.
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.
ξThere actually are two sleep state levels: “second hand sleep” and “function sleep”.
Elapsed Time in Dark | Operation | |
60 to 70 minutes (second hand sleep) | x Second Hand only stopped at 12 o’clock, all other functions enabled | |
6 or 7 days (function sleep) | ξ All functions, including timekeeping, disabled | |
ξ Internal timekeeping maintained | ||
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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.
To recover from the sleep state
Move the watch to a
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 ÒConÞ guring Current Time and Date Settings ManuallyÓ (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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LONDON (LON), PARIS (PAR), ATHENS (ATH) | Anthorn (England), Mainflingen (Germany) | |
HONG KONG (HKG) | Shangqiu City (China) | |
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TOKYO (TYO) | Fukushima (Japan), Fukuoka/Saga (Japan) | |
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NEW YORK (NYC), CHICAGO (CHI), |
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DENVER (DEN), LOS ANGELES (LAX), | Fort Collins, Colorado (United States) | |
ANCHORAGE (ANC), HONOLULU (HNL) |
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Important!
ξ The areas covered by HONOLULU (HNL) and ANCHORAGE (ANC) are quite far from the calibration signal transmitters, so certain conditions may cause reception problems.
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Approximate Reception Ranges
UK and German Signals
Anthorn 
500 kilometers
1,500 kilometers
The Anthorn signal is receivable | Mainflingen | |
within this area. | ||
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Japanese Signals
Fukushima
500 kilometers
Fukuoka/Saga 
1,000 kilometers
North American Signal
| 2,000 miles |
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| 600 miles |
| (1,000 kilometers) |
| Fort Collins |
Chinese Signal | |
500 kilometers | Changchun |
| Beijing |
| Shangqiu |
| Shanghai |
| Chengdu |
| Hong Kong |
1,500 kilometers
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 summer time, etc.
To get ready for a receive operation
1.Place the watch in a location where signal reception is good.
ξPosition the watch as shown in the nearby illustration, with 12 o’clock pointed towards a window. Make sure
12 o’clock | there are no metal objects nearby. | |
ξ Signal reception normally is better at night. | ||
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or | ξ The receive operation takes from two to seven minutes, | |
but in some cases it can take as long as 14 minutes. | ||
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| Take care that you do not perform any button operation | |
| or move the watch during this time. |
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ξSignal reception may be difficult or even impossible under the conditions described below.
To perform manual receive
1.Keep Bdepressed for at least two seconds as the x Second Hand goes through the following sequence.
ξMoves to YES (or Y for some models) or NO (N) to indicate the last signal reception result, then to READY (R).
2.The x Second Hand indicates the operations the watch is currently performing.
Inside or among Inside a vehicle | Near household | Near a | Near high- | Among |
buildings | appliances, | construction | tension power | or behind |
| office | site, airport, or | lines | mountains |
| equipment, or a | other sources of |
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| mobile phone | electrical noise |
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2.What you should do next depends on whether you are using Auto Receive or Manual Receive.
ξAuto Receive: Leave the watch over night in the location you selected in step 2. See “Auto Receive” for details.
ξManual Receive: Perform the operation under “To perform manual receive”.
Auto Receive
ξ With Auto Receive, the watch performs the receive operation each day automatically up to six times |
(up to five times for the Chinese calibration signal) between the hours of midnight and 5 a.m. When any |
receive operation is successful, none of the other receive operations for that day are performed. |
Note
When the x Second Hand is | It means this: | |
pointed here: | ||
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READY (R) | Watch is setting up for reception. | |
WORK (W) | Reception is in progress. | |
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YES (Y) | Reception was completed successfully. | |
NO (N) | Reception failed for some reason. |
ξIf signal reception is unstable, the x Second Hand may move between WORK (W) and READY (R).
ξWhen the receive operation is successful, the watch adjusts the time setting accordingly, and then resumes regular timekeeping. It does not adjust the setting if the operation failed.
ξ When a calibration time is reached, the watch will perform the receive operation. The receive operation |
is not performed if a calibration time is reached while you are configuring settings. |
ξTo interrupt a receive operation and return to regular timekeeping, press any button.