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Operation Guide 4383
3
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date. This section also explains how to set the
current date and time manually.
• If you become confused and lose your way during the
following procedures, simply put the watch down and do
not perform any button operation for two or three
minutes. This will cause the watch to enter the
Timekeeping Mode (indicated by normal one-second
movement of the second hand) automatically. After that,
you can try performing the manual setting procedure
again from the beginning.
• All of the operations in this section are performed in the
Timekeeping Mode, which you enter by pressing B.
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Hour hand
Minute hand
Date
Second hand
To set the time and date manually
1.In the Timekeeping Mode, hold down A for about five
seconds.
•
This will cause the second hand to move to 5 o’clock, 6
o’clock, 7 o’clock, or 8 o’clock, depending on the currently
selected GMT differential setting. This is the setting mode.
• The GMT differential value indicates the time difference in
hours between Greenwich Mean Time and the currently
selected time zone.
•
The hour and minute hands do not move in the setting mode.
2.Press A to cycle through settings in the sequence shown
below.
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Timekeeping
Mode
Hold down .
Press .
Year
(1’s Digit)
Year
(10’s Digit)
Seconds
Hour/Minutes
(Back)
Hour/Minutes
(Forward)
GMT Differential
Value
DayMonth
GMT differential
value (–06)
GMT differential
value (–07)
GMT
differential
value
(–08)
GMT differential
value (–05)
To do this:
Change the time zone
Move the hour and minute hands
clockwise one minute
Move the hour and minute hands
counterclockwise one minute
Reset the seconds to 00
While the second hand is here:
5 o’clock (GMT –05), 6 o’clock
(GMT –06), 7 o’clock (GMT –07),
or 8 o’clock (GMT –08)
AM or PM
AM or PM
SEC
Do this:
Use B (+).
Use B (+).
Use B (–).
Press B.
3. Select the setting you want to change, and then use B to change it as shown
below.
• Pressing B while the seconds setting is selected will cause the second hand to
move to 00 seconds. This also advances the minute by one, resets the seconds
count to 00, and exits the setting mode automatically.
• If you want to change the year, month, and day setting after resetting the
seconds, re-enter the setting mode from step 1.
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0
1
2
3
4
57
8
9
6
30
Dec
Jan
Feb
Mar
Apr
May
Jul
Aug
Sep
Oct
Nov
Jun
• When setting the day, the watch automatically will skip days
(30 and 31) that are not included in the currently selected
month. If you can’t select 30 or 31 when you want to, check
to make sure that the proper month is selected.
4. After setting the 1’s digit of the year, press A to exit the
setting mode.
•
This will cause the hands to move to the current time, and
resume normal movement.
• Make sure that you set the time correctly as AM or PM (as
indicated by the second hand) when setting the time. The
second hand will move between AM and PM any time the
hour hand moves past 12 o’clock while you are setting the
time.
To do this:
Change the day
Change the month
Change the year
While the second hand is here:
12 o’clock
Current month
10’s digit of current year
1’s digit of current year
Do this:
Use B (+).
Setting the Month
Setting the Year
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.
30
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.
• Never try to remove or replace the watch’s special battery yourself. Use of the wrong
type of battery can damage the watch.
• The current time and all other settings return to their initial factory defaults whenever
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.
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Battery Power Levels
The movement of the analog hands indicates the current battery power level.
Hand Movement
Normal.
•Second hand jumps
every 2 seconds.
•Date changes to home
position at midnight.
•Second hand stopped.
•Hour and minute hands
stopped at 12 o’clock.
Level
1
2
3
Function Status
All functions enabled.
All functions disabled,
except for analog
timekeeping.
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.
• When battery power is at Level 2, time calibration signal reception is disabled.
Jumps 2 seconds
• At Level 3, all functions are disabled and settings return to their initial factory
defaults. The analog hands will move to the current time and normal timekeeping will
resume when the battery is recharged sufficiently.
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.
• Since these are the specs, we can include all the technical details.
• Watch is not exposed to light
• Internal timekeeping
• Analog hands operational 18 hours per day, sleep state 6 hours per day
• 1 time calibration reception per day
• Stable operation is promoted by frequent charging.
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
6 minutes
30 minutes
48 minutes
8 hours
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
16 hours
78 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
1 hour
3 hours
4 hours
37 hours
Exposure Level
(Brightness)
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
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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 leave the watch in the Home Position Adjustment Mode for two or three
minutes without performing any operation, it returns 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.
Scrolling
• The B button is used to change the hand setting in various setting modes. In most
cases, holding down the B button will start high-speed movement of the applicable
hand(s).
• High-speed movement of the hands will continue until it completes a 12-hour cycle,
or until you press any button to stop it.
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 cannot be performed starting from January 1, 2100.