Casio 4757 Operation Manual

MO0611-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.
General Guide
• Press C to change from mode to mode.
• In any mode (except when a setting screen is on the display), press A to illuminate
the face of the watch.
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 from
Mainflingen, Germany and the signal from Rugby, England.
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 transmitter, 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
3. Press B to exit the setting screen.
• The watch will also return to the Timekeeping Mode if you do not perform any
operation for two or three minutes.
• Your watch should show the correct time when you exit the Home Time Zone setting
screen. While the hands are moving to the new time setting, the current time will be
shown on the digital display. 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.
• See the map 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 six
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".
Operation Guide 4757
If all the analog hands are stopped at 12 o'clock...
To conserve battery power, the watch is shipped from the
factory with its functions disabled. All the watch's analog
hands are stopped at 12 o'clock, and the digital display
alternates between the hour and minute. To activate the
watch's functions, press any one of the three buttons. This
will cause the analog hands to move to the current time
setting.
Press C.
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 screen.
• 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.
• The following are the GMT differential values for major
cities in the Western Europe time zones.
Time Zone Major cities in time zone
+0 London, Dublin, Lisbon
Paris, Milan, Rome, Madrid,Amsterdam,
+1 Hamburg, Berlin, Frankfurt, Vienna,
Stockholm
+2 Athens, Helsinki
About This Manual
• Most of the display examples in this manual show only
Minute hand
the digital display, without the analog hands.
• Button operations are indicated using the letters shown
Hour hand
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.
Second hand
Receive Result Mode
Home Position
Adjustment Mode
Important!
• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o'clock side facing towards a window.
Make sure there are no metal objects nearby.
• Make sure the watch is facing the right 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 or
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 14 minutes. Take care that you do not perform any
button operations or move the watch during this time.
• When within range of the applicable transmitter, this watch can receive either the
Germany (Mainflingen) or England (Rugby) time calibration signals.
See "Transmitters" for more information.
Reception Ranges
1,500 kilometers
Rugby
500 kilometers
• At distances further than about 500 kilometers from a transmitter, signal reception
may not be possible during certain times of year or times of day. Radio interference
may also cause problems with reception.
• Even when the watch is within the reception range of the transmitter, signal
reception is 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.
• See the information under "Signal Reception Troubleshooting" if you experience
problems with time calibration signal reception.
Alarm Mode
12 o'clock
or
Near a Near high- Among or
construction tension behind
site, airport, or power lines mountains
other sources
of electrical
noise
Mainflingen
1