Casio 4303 User Manual

MO0510-EA

6 o’clock

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

Minute hand

Hour hand

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

• 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.

Date

(Day of week)

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.

Press B.

▲

Press A.

▲

Receive Result ModeTimekeeping 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.

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

• 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 among buildings

• 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

• 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.

Inside a vehicle

Near household appliances, office equipment, or a mobile phone

2,000 miles

600 miles

Fort Collins

Near a construction site, airport, or other sources of electrical noise

1,500 kilometers (930 miles)

Rugby

500 kilometers (310 miles)

Near hightension power lines

Among or behind mountains

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

12345

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

Daylight Saving Time 3:00 am 4:00 am 5:00 am Midnight

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.

Midnight 1:00 am next day

Receiving indicator

Weak

(Level 0)

• 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

Receive successful

Receive failed

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 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 “ The watch will enter the Timekeeping Mode without changing the time setting if you press A or if you do not perform any button operation for about three minutes.

Strong

(Level 3)

R0 starts to

xx”.

Signal Reception Troubleshooting

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

Cannot perform manual receive.

Auto receive is not being performed successfully (“

xx”

displayed).

Time setting is incorrect following signal reception.

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

• The watch is not in the Timekeeping Mode or Receive Result Mode.

• Your current Home Time Zone setting is not one of the following: 0,

+1, E (GMT–5), C (GMT–6), M (GMT–7) or P (GMT–8).

• You changed the time setting manually.

•

You were adjusting the watch settings when the auto receive start times were reached.

•

You pressed A while signal receive was in progress.

• The Home Time Zone setting is not correct for the area where you are using the watch.

• The home position of the hands is off.

What you should doProblem Probable Cause

• Enter the Timekeeping Mode and try again.

• Select 0, +1, E (GMT–5), C (GMT–6), M (GMT–7) or P (GMT–8) as your Home Time

Zone.

• Perform manual signal receive or wait until the next auto signal receive operation is performed.

• Check to make sure the watch is in a location where it can receive the signal.

• Select the correct Home Time Zone.

• Enter the Home Position Adjustment Mode and adjust the home position.

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

Correct second hand home position

12 o’clock

Correct hour and minute hand home position

1. While in the Timekeeping Mode, hold down A and 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 onesecond steps, until it points at 12 o’clock.

• Holding down A for more than two seconds causes the hands to move at high speed. Pressing A again stops the hands.

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 A to 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 the hands to move at high speed. Pressing A again stops the hands.

5. Pressing B exits the home position adjustment mode

and enters the Timekeeping Mode.

Timekeeping

Use the Timekeeping Mode to set and view the current

Minute hand

Hour hand

Second hand

To set the time and date manually

12 o’clock

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 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.

• All of the operations in this section are performed in the

Date

Timekeeping Mode.

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 B to cycle through settings in the sequence shown

below.

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 “

• To return to the Timekeeping Mode, press A.

• If you adjust the time or date setting manually, The

display shows “

xx”.

Hold down B. Press B.

Timekeeping Mode

Auto Receive

GMT Differential Value

Day of the Week Language

DST

Year

Hour

Minutes

Seconds

MonthDay

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