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Casio 4306 Manual

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Operation Guide 3779 4306
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Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from Standard
Time. Remember that not all countries or even local areas use Daylight Saving Time.
The time calibration signal includes both Standard Time and Daylight Saving Time
data. If you select AUTO for the DST setting, the watch will switch between Standard
Time and Daylight Saving time automatically as required.
•Changing the Home Time Zone (GMT differential) setting to anything besides 9
o’clock (GMT +9) or 11 o’clock (receive off) will change the DST setting to AUTO.
Selecting 9 o’clock (GMT +9) or 11 o’clock (receive off) will change the DST setting
to OFF. See “To specify your Home Time Zone” for details about time zones.
To switch between Daylight Saving Time and Standard Time
1. In the Timekeeping Mode, hold down B for about five
seconds until the second hand moves to the currently
selected time zone and stops. This is the setting mode.
2. Press B once.
•This will cause the second hand to move to the 47,
52, or 57 seconds position. The hand position
indicates the current DST setting.
3. Press A to cycle through the DST settings.
•The following shows how the second hand indicates
the DST settings.
47 seconds ................................................... OFF
52 seconds ................................................... AUTO
57 seconds ................................................... DST ON
4. When the setting is the way you want, press B twice to
exit the setting mode.
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.
Back Cover
The back cover of the watch is marked with the relative positions of each time zone
city code. The position of “LAX” on the back of the watch, for example, indicates that
the “LAX” (Los Angeles) city code is located at 8 o'clock on the face of the watch.
Auto Return Features
The watch will return to the Timekeeping Mode automatically if you do not perform any
operation for about three minutes while it is in the Receive Result Mode, the Home
Position Adjustment Mode, or a setting mode.
Button Operation Timing
This watch is designed so the function of a button is executed when you release the
button, not when you press it.
Scrolling
•The A button is used to change the hand setting in various setting modes. In most
cases, holding down the A 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 A to stop it.
Radio-controlled Timekeeping Precautions
•Strong electrostatic charge can result in the wrong time being set.
•Even when the watch is within the reception range of the transmitter, signal
reception will be impossible if the signal is blocked by mountains or other geological
formations between the watch and signal source.
•Signal reception is affected by weather, atmospheric conditions, and seasonal
changes.
•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.
•If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within ±20 seconds a month at normal temperature.
•If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your Home Time Zone (GMT
differential) setting.
The following are the initial factory defaults for this setting.
Module 3779: GMT +1
Module 4306: GMT +0
•To find out the module number of your watch, look at its
back cover. The Module number (3779 or 4306) is
engraved inside the box on the back cover.
3779
In this case:
The first signal search
operation after the Home Time
Zone has been changed
The second and subsequent
signal searches
The watch does this:
1. Checks the Mainflingen signal first.
2. If the Mainflingen signal cannot be received,
checks the Rugby signal.
1. Checks the signal of the transmitter of the first
receive operation (Rugby or Mainflingen).
2. If the checked signal cannot be received, checks
the other signal.
Transmitters
The time calibration signal received by this watch depends on the currently selected
home time zone.
• When a U.S. time zone is selected, the watch receives the time calibration signal
transmitted from the United States (Fort Collins).
• When a European time zone is selected, the watch receives the time calibration
signals transmitted from Germany (Mainflingen) and England (Rugby). The following
tables show the reception priority for the European signals.
The watch does this:
1. Checks the Rugby signal first.
2. If the Rugby signal cannot be received, checks
the Mainflingen signal.
1. Checks the signal of the transmitter of the first
receive operation (Rugby or Mainflingen).
2. If the checked signal cannot be received, checks
the other signal.
In this case:
The first signal search
operation after the Home Time
Zone has been changed
The second and subsequent
signal searches
When time zone GMT+0 is selected:
Timekeeping
•The current time for all time zones in the Timekeeping Mode is calculated in
accordance with the Greenwich Mean Time (GMT) differential of each zone, based
on your Home Time Zone time setting.
•
GMT differential is calculated by this watch based on Universal Time Coordinated (UTC*) data.
*
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.
When time zone GMT+1 or GMT+2 is selected:
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