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Operation Guide 5040
5
6. Press C to advance to change to right dial (24-hour
time) correction.
• This will cause the hour and minute hands of the right
dial to move to their home positions.
• Home Positions
Hour hand: 24 o’clock
Minute hand: 24 o’clock
7. Use D (+) and B (–) to correct the right dial hands.
8. Press C to change to left dial correction.
• This causes the left dial hand to move to its home
position.
• Home Position
Left Dial: 12 o’clock
9. Use D (+) and B (–) to correct the left dial hand.
30
Minute hand
Hour hand
30
Left dial hand
10. Press C to change to day correction.
• This causes the day to move to its home position.
• Home Position
Day: 1
11. Use D (+) and B (–) to correct the day indication.
• Each press of D or B moves the day indicator very
slightly. Keep pressing the applicable button until the
day is aligned the way you want.
12. Press A to exit home position correction and return to
normal timekeeping.
• If you press C instead of A, the watch will return to
step 1 (second hand home position adjustment) of this
procedure.
Check to make sure that the time, day, and day of the
week are being indicated correctly.
1
Day
3
0
Power Supply
This watch is equipped with a solar cell and a special rechargeable battery (secondary
battery) that is charged by the electrical power produced by the solar cell. The
illustration shown below shows how you should position the watch for charging.
Example: Orient the watch so its face is
pointing at a light source.
• The illustration shows how to position
a watch with a resin band.
• Note that charging efficiency drops
when any part of the solar cell is
blocked by clothing, etc.
• You should try to keep the watch
outside of your sleeve as much as
possible. Even if the face of the watch
is blocked from light only partially,
charging will be reduced significantly.
Solar cell
Important!
• 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 rechargeable battery
power to run down. Make sure that the watch is exposed to bright light whenever
possible.
• This watch uses a special rechargeable battery to store power produced by the solar
cell, so regular battery replacement is not required. However, after very long use, the
rechargeable battery may lose its ability to achieve a full charge. If you experience
problems getting the special rechargeable battery to charge fully, contact your dealer
or CASIO distributor about having it replaced.
• The special rechargeable (secondary) battery used by your watch is not intended to
be removed or replaced by you. Use of a rechargeable battery other than the special
one specified for this watch can damage the watch.
• The current time and all other settings return to their initial factory defaults whenever
the watch is left uncharged for about one week after battery power drops to Level 3,
and when you have the battery replaced.
• Keep the watch in an area normally exposed to bright light when storing it for long
periods. This helps to keep the rechargeable battery from going dead.
Battery Power Levels
The movement of the analog hands indicates the current battery power level.
Jumps two seconds
Hand Movement
Normal.
• Second hand jumps
every 2 seconds.
• Day changes to home
position.
• Second hand stopped.
• Hour and minute hands
stopped at 12 o’clock.
Level
1
2
3
Function Status
All functions enabled.
Beeper and time
calibration signal
reception disabled.
All functions disabled.
• The second hand jumping every two seconds (Level 2) indicates that battery power
is quite low. Expose the watch to light as soon as possible to charge the battery.
30
• When battery power is at Level 2, time calibration signal reception is disabled.
• When power drops to Level 3, 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 normal timekeeping will resume. If the watch is left uncharged for
about one week after battery power drops to Level 3, the current time and all other
settings return to their initial factory defaults.
• Alarm operation can cause hand movement to stop due to a sudden temporary drop
in power. This does not indicate malfunction, and normal operation will resume when
the watch is exposed to light. Though hand movement stops, timekeeping continues
internally, and the hands will be adjusted to the correct setting when normal
operation returns.
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.
Warning!
Leaving the watch in bright light to charge its rechargeable battery 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
Charging Guide
After a full charge, timekeeping remains enabled for up to about five months.
• The following table shows the amount of time the watch needs to be exposed to light
each day in order to generate enough power for normal daily operations.
Exposure Level (Brightness)
Outdoor sunlight (50,000 lux)
Sunlight through a window (10,000 lux)
Daylight through a window on a cloudy day
(5,000 lux)
Indoor fluorescent lighting (500 lux)
Approximate Exposure Time
8 minutes
30 minutes
48 minutes
8 hours
• For details about the battery operating time and daily operating conditions, see the
“Power Supply” section of the Specifications.
• Stable operation is promoted by frequent charging.
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
23 hours
85 hours
138 hours
– – –
Outdoor sunlight (50,000 lux)
Sunlight through a window
(10,000 lux)
Daylight through a window on
a cloudy day (5,000 lux)
Indoor fluorescent lighting
(500 lux)
Approximate Exposure Time
Level 3 Level 2 Level 1
2 hours
6 hours
8 hours
92 hours
Exposure Level
(Brightness)
▲
▲
▲
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Auto Return Features
• If you do not perform any operation for about two or three minutes in the Alarm
Mode, in the current time setting mode, or in the hand/day home position correction
mode, the watch will return to the Timekeeping Mode automatically.
• If you do not perform any operation for about two or three minutes while a setting
mode is selected, the watch will exit the setting mode automatically.
High-Speed Movement
• In most cases when configuring settings, holding down a button will start high-speed
scrolling of the applicable setting.
• High-speed movement of hands and day will continue until you press any button.
Radio-controlled Atomic Timekeeping Precautions
• Strong electrostatic charge can result in the wrong time being set.
•
The time calibration signal bounces off the ionosphere. Because of this, such factors as
changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to
higher altitudes due to seasonal atmospheric changes or the time of day may change
the reception range of the signal and make reception temporarily impossible.
• Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• The watch is designed to update the date and day of the week automatically for the
period January 1, 2000 to December 31, 2099. Setting of the date by the time
calibration signal will not be performed starting from January 1, 2100.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time with the precision noted in “Specifications”.
Timekeeping
• The year can be set in the range of 2000 to 2099.
• The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there normally should be no reason
to change it. Note, however, that if the watch is left uncharged for about one week
after battery power drops to Level 3, the current time and all other settings return to
their initial factory defaults.
• The date will change automatically when the current time reaches midnight. The
date change at the end of the month may take more time than normal.
• The current time for all time zones in the Timekeeping Mode and World Time Mode
is calculated in accordance with the Coordinated Universal Time (UTC) offset of
each zone, based on your Home Time Zone time setting.
• UTC is the world-wide scientific standard of timekeeping. It is based upon carefully
maintained atomic (cesium) clocks that keep time accurately to within microseconds.
Leap seconds are added or subtracted as necessary to keep UTC in sync with the
Earth’s rotation. The reference point for UTC is Greenwich, England.
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