Operation Guide 5251 (OC)
Contents
E-2 About this manual
E-3 About the face
E-4 Crown Operations
E-6 Things to check before using the watch E-10 Charging the Watch
E-16 Radio Controlled Atomic Timekeeping
E-29 Adjusting the Home Positions E-32 Troubleshooting
E-36 Specifications
E-22 Configuring Time and Date Settings
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Charging the Watch
The face of the watch is a solar panel that generates power from light. The generated power charges a
Charging Guide
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.
Whenever you are not wearing |
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| When wearing the watch, |
the watch, be sure to leave it in |
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| makes sure that its face is |
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a location where it is exposed |
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| not blocked from light by the |
to light. |
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| sleeve of your clothing. |
ξ Best charging performance |
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| ξ The watch may enter a sleep |
is achieved by exposing |
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| state (page |
the watch to light that is as |
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| blocked by your sleeve even |
strong as possible. |
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| 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.
ξOn the dashboard of a car parked in direct sunlight
ξToo close to an incandescent lamp
ξUnder direct sunlight
Power Levels
Movement indicates the current charge level.
You can get an idea of the watch’s power level by observing the movement of the x Second Hand in the regular timekeeping.
Level | Hand Movement |
| Charge | ||||
1 | Normal. |
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| Battery is charged. | |
| x Second Hand moves in the following |
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2 | pattern. |
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| Battery is starting to go low. | |
| 1 second |
| 1 second |
| 2 seconds |
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| x Second Hand moves at |
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3 | intervals. |
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| Battery is low. | |
v Day Indicator changes to 1 (home | |||||||
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4 | x Second Hand stopped. |
| Battery is very low. | ||||
z Hour Hand and c Minute Hand | |||||||
| stopped at 12 o’clock. |
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ξWhen power drops to Level 4, all functions will be disabled but the watch will continue to keep time internally for about one week. If you recharge the battery sufficiently during this period, the analog hands will move automatically to the correct setting and regular timekeeping will resume. After one week, all settings (including timekeeping) will be cleared. Recharging the battery will reset all settings to their initial factory defaults.
Charging Guide
The charging guide causes the x Second Hand to perform movement that gives you a rough idea of whether the watch needs to be exposed to light in order to charge the battery.
To use the charging guide
1.Pull the crown out to the fi rst click. The x Second Hand will move to the currently selected location setting. Next, push the crown back in.
ξFor about one second, the x Second Hand will perform movement that indicates whether the watch’s battery requires charging.
| Battery is charged. | |
Charge is very low. | Charge is low. | |
Consider leaving the watch in | ||
Leave the watch in bright | ||
light for charging. | ||
light for long time until | ||
charged. |
Charge is low.
Leave the watch in light for charging.
ξ The current charging requirement is indicated whenever you push the crown back in from the first click.
ξ Failure to expose the watch to light when charging is required will cause the charge to be reduced even further.
ξ The charging guide is based on a calculated value (not the actual battery charge). Because of this, the battery charge may go low even if the charging guide indicates that immediate charging is not required. If this happens, expose the watch to light as soon as possible to charge the battery.
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Charging Times
| Daily Operation |
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| Level Change *2 |
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Exposure Level (Brightness) |
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| Level 4 | Level 3 | Level 2 |
| Level 1 | |||
*1 |
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Outdoor sunlight (50,000 lux) | 8 minutes |
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| 2 hours |
| 25 hours | |||
Window sunlight (10,000 lux) | 30 minutes |
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| 4 hours |
| 93 hours | |||
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Window sunlight on cloudy day (5,000 lux) | 48 minutes |
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| 6 hours | 151 hours | ||||
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Indoor fluorescent lighting (500 lux) | 8 hours |
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| 59 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
How Power Saving works
The watch will enter the sleep state if it is left in a dark location for about one week.
ξIn the sleep state:
−All hands stop at 12 o’clock.
−Auto Receive is disabled.
−Internal timekeeping continues to operate normally.
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
ξIt can take up to eight minutes for the watch to resume normal operation after recovering from the sleep state. Do not perform any button operations during that time.
Power Saving
A Power Saving feature causes the watch to enter a sleep state automatically whenever it is left for a certain period in an area where it is dark.