Casio 4303 Manual

Time Zone

MO0510-EA

Operation Guide 4303

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.

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.

•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

• Button operations are indicated using the letters shown

		Minute hand	in the illustration.
	Hour hand		• 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.

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 Aand B to change from mode to mode as shown below.

Timekeeping Mode (Day)	Timekeeping Mode
	(Day of week)
	Press B.
▲	▲
Timekeeping Mode	Receive Result Mode
	Press A.
▲	▲

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

1.In the Timekeeping Mode, hold down Bfor 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 Ato 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

•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.

3. Press Bten 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.

6 o’clock

•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	Near a	Near high-	Among or
among	vehicle	household	construction	tension	behind
buildings		appliances,	site, airport, or	power lines	mountains
		office	other sources
		equipment,	of electrical
		or a mobile	noise
		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
2,000 miles	(930 miles)

Rugby

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.

1

Receive successful

Receive failed

Operation Guide 4303

About 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. The reception schedule (calibration times) depends on your currently selected Home Time Zone, and whether standard time or Daylight Saving Time is selected for your Home Time Zone.

Your Home Time Zone			Auto Receive Start Times
		1	2	3	4	5
GMT 0	Standard Time	1:00 am	2:00 am	3:00 am	4:00 am	5:00 am
	Daylight Saving Time	2:00 am	3:00 am	4:00 am	5:00 am	Midnight
GMT +1	Standard Time	2:00 am	3:00 am	4:00 am	5:00 am	Midnight
	Daylight Saving Time	3:00 am	4:00 am	5:00 am	Midnight	1:00 am
						next day
E (GMT	Standard Time and	Midnight	1:00 am	2:00 am	3:00 am	4:00 am
–5), C	Daylight Saving Time
(GMT –6),
M (GMT
–7), P
(GMT –8)

Note

•When a calibration time is reached, the watch will automatically receive the calibration signal only if it is in either the Timekeeping Mode or Receive Result Mode. It is not performed if a calibration time is reached while you are configuring settings.

•Auto receipt of the calibration signal is designed to be performed early in the morning, while you sleep (provided that the Timekeeping Mode time is set correctly). Before going to bed for the night, remove the watch from your wrist, and put it in a location where it can receive the signal easily.

•The watch receives the calibration signal for two to ten minutes everyday when the time in the Timekeeping Mode reaches each of the calibration times. Do not perform any button operation within ten minutes before or after any one of the calibration times. Doing so can interfere with correct calibration.

•Remember that reception of the calibration signal depends on the current time in the Timekeeping Mode. The receive operation will be performed whenever the display shows any one of the calibration times, regardless of whether or not the displayed time is actually the correct time.

About the Receiving Indicator

The receiving indicator shows the strength of the calibration signal being received. For best reception, be sure to keep the watch in a location where signal strength is strongest.

The receiving indicator is displayed while an auto or manual receive operation is in progress.

Receiving indicator

Weak		Strong
(Level 0)		(Level 3)

•Use the receiving indicator as a guide for checking signal strength and for finding the best location for the watch during signal reception.

To perform manual receive

Receiving	1. Place the watch on a stable surface so its 6 o’clock side
	is facing towards a window.
	2. Hold down A for about two seconds until R0 starts to
	flash on the display.
	• The second hand will move to 12 o’clock and stay there
	while actual reception is in progress.

•The hour and minute hands continue to keep time normally.

•Time calibration signal reception takes from two to ten

minutes. Take care that you do not perform any button operations or move the watch during this time.

• When receive is successful, the display shows the time that receive was successful.

• The watch will enter the Timekeeping Mode if you press A or if you do not perform any button operation for about three minutes.

• When receive is unsuccessful, the display shows “xx”. The watch will enter the Timekeeping Mode without changing the time setting if you press Aor if you do not perform any button operation for about three minutes.

Note

• To interrupt a receive operation and return to the Timekeeping Mode, press A.

Viewing the Latest Signal Reception Results

You can use the Receive Result Mode to check if signal reception was performed correctly.

To check the latest signal reception results

Enter the Receive Result Mode.

• When receive is successful, the display shows the time that receive was successful. When receive is not

successful, the display shows “xx”.

• To return to the Timekeeping Mode, press A.

• If you adjust the time or date setting manually, The display shows “xx”.

Signal Reception Troubleshooting

Check the following points whenever you experience problems with signal reception.

Problem	Probable Cause	What you should do
Cannot	• The watch is not in the Timekeeping	• Enter the Timekeeping Mode
perform	Mode or Receive Result Mode.	and try again.
manual	• Your current Home Time Zone	• Select 0, +1, E (GMT–5), C
receive.	setting is not one of the following: 0,	(GMT–6), M (GMT–7) or P
	+1, E (GMT–5), C (GMT–6), M	(GMT–8) as your Home Time
	(GMT–7) or P (GMT–8).	Zone.
Auto receive	• You changed the time setting	• Perform manual signal
is not being	manually.	receive or wait until the next
performed	• You were adjusting the watch settings	auto signal receive operation
successfully	when the auto receive start times	is performed.
(“xx”	were reached.	• Check to make sure the
displayed).	• You pressed Awhile signal receive	watch is in a location where it
	was in progress.	can receive the signal.
Time setting	• The Home Time Zone setting is not	• Select the correct Home
is incorrect	correct for the area where you are	Time Zone.
following	using the watch.	• Enter the Home Position
signal	• The home position of the hands is	Adjustment Mode and adjust
reception.	off.	the home position.

•For further information, see “Important!” under “Time Calibration Signal Reception” and “Radio-controlled Atomic Timekeeping Precautions”.

Adjusting the Home Positions

If the time and date settings are wrong even after the time calibration signal is received normally, use the following procedure to adjust their home positions.

To adjust the home positions

	12 o’clock								1. While in the Timekeeping Mode, hold down Aand B
									for about five seconds.
									• The analog hands do not keep time during home
									position adjustment.
									2. Check the position of the second hand.
		||		|	|	|	||		• The second hand home position is correct if it is
	|							|	pointing at 12 o’clock.
	|							||
	|
	|
		|		|	| |		|		• If the second hand is not pointing at 12 o’clock, it
									means that its home position is off. If this happens,
									press A to move the second hand clockwise in one-
									second steps, until it points at 12 o’clock.
	Correct second hand								• Holding down A for more than two seconds causes
	home position								the hands to move at high speed. Pressing Aagain
									stops the hands.
	12 o’clock								3. Press B to advance to hour and minute hand home
									position adjustment.
									• If current hour and minute hand alignment is correct,
									they will both move to 12 o’clock.
									4. Check the position of the hour and minute hands.
	|	|	|	|	|	|			• If the hour and minute hands are not pointing at 12
							|		o’clock, it means that their home position is off. If this
	|						|
	|						|
	|
	|						|		happens, press Ato move the hour and minute
		|	|	|	|	|
									hands clockwise in 20-second steps, until they point
									at 12 o’clock.
									• Holding down A for more than two seconds causes
	Correct hour								the hands to move at high speed. Pressing Aagain
									stops the hands.
	and minute hand
									5. Pressing B exits the home position adjustment mode
	home position
									and enters the Timekeeping Mode.

Timekeeping

Use the Timekeeping Mode to set and view the current Minute hand time and date. This section also explains how to set the

Hour hand	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 about 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.
	Date • All of the operations in this section are performed in the
Second hand	Timekeeping Mode.

To set the time and date manually

12 o’clock 1. In the Timekeeping Mode, hold down B for about five seconds.

				• This will cause the second hand to move to 12 o’clock.
				• The hour and minute hands do not move in the setting mode.
	| | | |			2. Press Bto cycle through settings in the sequence shown
|				below.
			|
|			|
|			|
|
|		| | |	|
		Hold down B.			Press B.
Timekeeping				GMT Differential		DST	Seconds	Hour
Mode				Value

Day of the

Auto Receive Day Month Year Minutes

Week Language

2