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Operation Guide 5351
E-10
E-33 Mode Reference Guide
E-34 To determine the watch’s current mode
E-34 To return to the Timekeeping Mode from any other mode
E-35 To select a mode
E-36 Timekeeping
E-37 Confi guring Home City Settings
E-37 To confi gure Home City settings
E-40 To switch between standard time and summer time manually
E-42 Confi guring Current Time and Day Settings Manually
E-42 To change the current time setting manually
E-45 To change the current day setting manually
E-49 Checking the Current Time in a Different Time Zone
E-50 To view the time in another time zone
E-53 To swap your Home City and World Time City
E-11
E-54 Using the Stopwatch
E-55 To enter and exit the Stopwatch Mode
E-55 To perform an elapsed time operation
E-56 To perform lap time measurement
E-57 To recall lap data
E-58 Using the Countdown Timer
E-59 To specify the countdown start time
E-60 To perform a countdown timer operation
E-60 To stop the alarm
E-61 Using the Alarm
E-62 To change the alarm time setting
E-64 To turn the alarm on or off
E-64 To stop the alarm
E-65 Adjusting Home Positions
E-67 To adjust home positions manually
E-12
E-70 Troubleshooting
E-79 Specifi cations
E-13
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 is achieved
by exposing the watch to
light that is as strong as
possible.
When wearing the watch,
make sure that its face is
not blocked from light by
the sleeve of your clothing.
• The watch may enter a
sleep state (page E-20) if its
face is blocked by your
sleeve even only partially.
E-14
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
• Too close to an incandescent lamp
• Under direct sunlight
Important!
• 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.
• 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.
E-15
Checking the Current Power Level
You can use the procedure below to determine the watch’s current power level.
Certain functions will be disabled when the power level is low. If the power level is
low, leave the watch in a location where its face (solar panel) is exposed to light.
To check the current power level
1. In the Timekeeping Mode, press B. The x
Second Hand will move to HIGH,
MID (Middle), or LOW to indicate the power level.
@
HIGH
MID: Middle
LOW
E-16
2. After about one second, the x Second Hand will then move to the latest time
calibration signal receive operation result.
• See “To check the result of the latest receive operation” (page E-30).
3. Press B to return to regular timekeeping.
• The watch will also return to regular timekeeping if you do not perform any
operation for about 10 seconds.
E-17
Low Power
Low power conditions are indicated by the movement of
the x Second Hand in the Timekeeping Mode.
• If the x
Second Hand is moving normally at one-second
intervals, power is at Level 1.
• If the x
Second Hand is moving at two-second intervals,
power is at Level 2, which is quite low. Expose the watch
to light as soon as possible so it can charge.
Low Battery Alert (Hand Movement and Function
Status)
Level Hand Movement Function Status
1
(HIGH, MID)
Normal. All functions enabled
2
(LOW)
x
Second Hand moves at
two-second intervals.
Beeper and time
calibration signal
reception disabled.
3
x Second Hand stopped.
All functions disabled
Moves at two-second
intervals.
@
E-18
• When power drops to Level 3, all settings (including timekeeping) will be cleared.
Recharging the battery will reset all settings to their initial factory defaults.
• When the watch is at Level 3, exposing it to light for a while will cause the x
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 15 minutes). Putting the watch in a location
where it is exposed to light will help power to recover sooner.
E-19
Charging Times
Exposure Level (Brightness)
Daily
Operation *1
Level Change *2
Level 3 Level 2 Level 1
Outdoor sunlight (50,000 lux) 8 minutes 3 hours 28 hours
Window sunlight (10,000 lux) 30 minutes 7 hours 107 hours
Window sunlight on cloudy day
(5,000 lux)
48 minutes 10 hours 172 hours
Indoor fl uorescent lighting
(500 lux)
8 hours 116 hours – – –
* 1 Approximate exposure required each day to generate power for normal daily
operation.
* 2 Approximate exposure required to take power up one level.
• The above times are for reference only. Actual times depend on lighting conditions.
• For details about the operating time and daily operating conditions, see the “Power
Supply” section of the Specifi cations (page E-80).