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Operation Guide 5251 (OC)
E-15
How Power Saving works
The watch will enter the sleep state if it is left in a dark location for about one week.
In the sleep state:
x
All hands stop at 12 o’clock. −
Auto Receive is disabled. −
Internal timekeeping continues to operate normally. −
The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch is already in a sleep x
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 well-lit area, press the A button, or pull out the crown to the fi rst click.
It can take up to eight minutes for the watch to resume normal operation after recovering from the sleep
x
state. Do not perform any button operations during that time.
E-14
Charging Times
Exposure Level (Brightness)
Daily Operation
*1
Level Change *2
Level 4 Level 3 Level 2 Level 1
Outdoor sunlight (50,000 lux) 8 minutes 2 hours 25 hours
Window sunlight (10,000 lux) 30 minutes 4 hours 93 hours
Window sunlight on cloudy day (5,000 lux) 48 minutes 6 hours 151 hours
Indoor fl uorescent lighting (500 lux) 8 hours 59 hours – – –
1 Approximate exposure each day to generate power for normal daily operation. *
2 Approximate exposure to take power up one level. *
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 x
the Specifi cations (page E-36).
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.
E-13
To use the charging guide
Pull the crown out to the fi rst click. The 1.
x
Second Hand will move to the currently selected location
setting. Next, push the crown back in.
For about one second, the
x
x
Second Hand will perform movement that indicates whether the watch’s
battery requires charging.
Charge is very low.
Leave the watch in bright
light for long time until
charged.
Battery is charged.
Charge is low.
Consider leaving the watch in
light for charging.
Charge is low.
Leave the watch in light for charging.
The current charging requirement is indicated whenever you push the crown back in from the fi rst x
click.
Failure to expose the watch to light when charging is required will cause the charge to be reduced x
even further.
The charging guide is based on a calculated value (not the actual battery charge). Because of this,
x
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.
E-12
When power drops to Level 4, all functions will be disabled but the watch will continue to keep time x
internally for about one week. If you recharge the battery suffi ciently 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.
E-11
Important!
Keep the watch in an area normally exposed to bright light when storing it for long periods. This helps
x
to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is x
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
x
Second Hand in the regular timekeeping.
Level Hand Movement Charge
1 Normal. Battery is charged.
2
x
x
Second Hand moves in the following
pattern.
1 second
1 second 2 seconds
Battery is starting to go low.
3
x
Second Hand moves at two-second
intervals.
v
Day Indicator changes to 1 (home
position).
Battery is low.
4
x
Second Hand stopped.
z
Hour Hand and
c
Minute Hand
stopped at 12 o’clock.
Battery is very low.
+B
>
@
Movement indicates the
current charge level.
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, be sure to leave it in
a location where it is exposed
to light.
Best charging performance
x
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.
The watch may enter a sleep
x
state (page E-14) 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.
On the dashboard of a car parked in direct sunlight
x
Too close to an incandescent lamp x
Under direct sunlight x
E-9
E-29 Adjusting the Home Positions
E-32 Troubleshooting
E-36 Specifi cations
E-8
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-13 To use the charging guide
E-15 To recover from the sleep state
E-16 Radio Controlled Atomic Timekeeping
E-18 To get ready for a receive operation
E-20 To perform manual receive
E-21 To check the result of the latest receive operation
E-22 Confi guring Time and Date Settings
E-23 To check the current location setting
E-23 To change the location setting
E-24 To set the time manually
E-26 To set the date manually