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MO0510-EA
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully and keep it on hand for later reference
when necessary.
• • • • • This watch does not have a time zone that corresponds to the Greenwich
Mean Time differential of –3.5 hours. Because of this, the radio-controlled
timekeeping and World Time functions will not display the correct time for
Newfoundland, Canada.
About This Manual
Minute hand
Hour hand
Date
Second hand
General Guide
• This watch is designed so the function of a button is executed when you release the
button, not when you press it.
• Use A and B to change from mode to mode as shown below.
Timekeeping Mode (Day)
Timekeeping Mode
Radio-controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly.
The time calibration signal includes both Standard Time and Daylight Saving Time
(summer time) data.
• This watch is designed to pick up the time calibration signal transmitted in the United
States (Fort Collins) and England (Rugby).
Current Time Setting
This watch adjusts its time setting automatically in accordance with a time calibration
signal. You can also perform a manual procedure to set the time and date, when
necessary.
• The first thing you should do after purchasing this watch is to specify your Home
Time Zone, which is the time zone where you will normally use the watch. For more
information, see "To specify your Home Time Zone" below.
• When using the watch outside the range of the time signal transmitters, you will have
to adjust the current time setting manually as required. See "Timekeeping" for more
information about manual time settings.
To specify your Home Time Zone
Time Zone
• The U.S. time calibration signal can be picked up by the watch while in North
America.
*
*
The term "North America" in this manual refers to the area that consists of
Canada, the continental United States, and Mexico.
Operation Guide 4303
Before using the watch for the first time...
Some watches are sent from the factory with timekeeping
stopped, and the second hand at 12 o'clock. Press the A
button to start the second hand.
• Button operations are indicated using the letters shown
in the illustration.
• Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the "Reference" section.
Timekeeping Mode
(Day of week)
Press B.
Receive Result Mode
Press A.
1. In the Timekeeping Mode, hold down B for about five
seconds until the currently selected Time Zone appears
on the display. 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.
2. Press A to select the time zone you want to use as
your Home Time Zone.
E (GMT– 5) : New York, Detroit, Miami, Boston
C (GMT– 6) : Chicago, Houston, Dallas/Fort Worth,
New Orleans
M (GMT– 7) : Denver, El Paso, Culiacan
P (GMT– 8) : Los Angeles, San Francisco, Las Vegas,
Seattle/Tacoma, Tijuana
0 (GMT 0) : London
+1 (GMT+ 1) : Paris, Berlin, Milan, Rome, Amsterdam,
Hamburg, Frankfurt, Vienna, Barcelona,
Madrid
3. Press B ten times to exit the setting mode.
• The watch will also return to the Timekeeping Mode if you do not perform any
operation for about three minutes.
• Normally, your watch should show the correct time as soon as you exit the Home
Time Zone setting screen. If it does not, it should adjust automatically after the next
auto receive operation (in the middle of the night). You can also perform manual
receive or you can set the time manually.
• Even if the time calibration signal is received correctly, there are some times when
the analog hands may not indicate the correct time. If this happens, use the
procedures under "Adjusting the Home Positions" to check the home positions of the
hands, and make adjustments as required.
• The watch will receive the time calibration signal automatically from the applicable
transmitter (in the middle of the night) and update its settings accordingly. For
information about the relationship between time zones (GMT differential values) and
transmitters, see "Transmitters".
• See the maps under "Reception Ranges" for information about the reception ranges
of the watch.
• You can disable time signal reception, if you want. See "To set the time and date
manually" for more information.
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
• Auto Receive
With auto receive, the watch receives the time calibration signal automatically up to
five times a day. When any auto receive is successful, the remaining auto receive
operations are not performed. For more information, see "About Auto Receive".
• Manual Receive
Manual receive lets you start a time calibration receive operation with the press of a
button. For more information, see "To perform manual receive".
Important!
• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 6 o'clock side facing towards a window.
Make sure there are no metal objects nearby.
• The watch should not be facing the wrong way.
• Proper signal reception can be difficult or even impossible under the conditions listed
below.
Inside or
Inside a
Near
among
vehicle
household
buildings
appliances,
office
equipment,
or a mobile
phone
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to seven minutes, but in some
cases it can take as long as ten minutes. Take care that you do not perform any
button operations or move the watch during this time.
Reception Ranges
1,500 kilometers
(930 miles)
2,000 miles
600 miles
Fort Collins
500 kilometers
(310 miles)
• Under good reception conditions, signal reception is possible within a radius of about
2,000 miles (3,000 kilometers) from the Fort Collins (the United States) transmitter.
• At distances further than about 600 miles (1,000 kilometers) from the Fort Collins (the
United States) transmitter, signal reception may not be possible during certain times of
year or times of day. Radio interferance may also cause problems with reception.
• Under good reception conditions, signal reception is possible within a radius of about 1,500
kilometers (930 miles) from the Mainflingen (Germany) or Rugby (England) transmitter.
• At distances further than about 500 kilometers (310 miles) from the Mainflingen
(Germany) or Rugby (England) transmitter, signal reception may not be possible
during certain times of year or times of day. Radio interferance may also cause
problems with reception.
• See the information under "Signal Reception Troubleshooting" if you experience
problems with time calibration signal reception.
6 o'clock
Among or
Near a
Near high-
construction
tension
behind
site, airport, or
power lines
mountains
other sources
of electrical
noise
Rugby
1

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Summary of Contents for Casio 4303

  • Page 1 Operation Guide 4303 Getting Acquainted Congratulations upon your selection of this CASIO watch. To get the most out of your 3. Press B ten times to exit the setting mode. purchase, be sure to read this manual carefully and keep it on hand for later reference •...
  • Page 2 Operation Guide 4303 Signal Reception Troubleshooting About Auto Receive Check the following points whenever you experience problems with signal reception. The watch receives the time calibration signal automatically up to five times a day. When any auto receive is successful, the remaining auto receive operations are not...
  • Page 3 Operation Guide 4303 3. Select the setting you want to change, and then use A to change it as shown Transmitters below. The time calibration signal received by this watch depends on the currently selected home time zone. Screen To do this: Do this: •...

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