Casio 4791 Owner's Manual

MO0705-EA

Operation Guide 4791

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.

If all the analog hands are stopped at 12 o’clock...

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.

Manual Receive

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. To activate the watch’s functions, press either of the two buttons. This will cause the analog hands to move to the current time setting.

Press any button.

▲

Timekeeping Mode

▲

Press A.

About This Manual

Minute hand

Hour hand

Second hand

Receive Result 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.

Home Position

Adjustment Mode

Hold down A and B

Hold down A for about two seconds.

▲

for about five seconds.

Press A twice.

Radio-controlled 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 switches automatically between Standard Time and Daylight Saving Time in accordance with the time calibration signal it receives. There is no indicator showing whether the time currently shown by the watch is Standard Time or Daylight Saving Time.

• This watch is designed to pick up the time calibration signal transmitted in Germany (Mainflingen) and England (Rugby).

• See the information under “Signal Reception Troubleshooting” if you experience problems with time calibration signal reception.

Current Time Setting

This watch adjusts its time setting automatically in accordance with a time calibration signal. You also can perform a manual procedure to set the time, when necessary.

• The first thing you should do after purchasing this watch is to specify a GMT differential, which is the time differential between GMT and the location where you normally will use the watch. For more information, see “To specify a GMT differential” below.

• When using the watch outside the range of the Germany and England time signal transmitters, you have to adjust the current time setting manually as required. See “Timekeeping” for more information about manual time settings.

To specify a GMT differential

GMT

differential

value (+0)

value (+1)

• Normally, your watch should show the correct time as soon as you select a GMT differential. 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 GMT differential values and transmitters, see “Transmitters”.

• See the maps under “Reception Ranges” for information about the reception ranges of the watch.

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”.

1. In the Timekeeping Mode, hold down B for about five

seconds until the second hand moves to the currently selected GMT differential setting and stops. This is the setting mode.

GMT differential value (+2)

• The GMT differential value indicates the time difference in hours from Greenwich Mean Time.

2. Use A to move the second hand to the GMT

differential setting you want to use.

GMT +0 (12 o’clock): London GMT +1 (1 o’clock): Paris, Berlin, Milan, Rome,

Amsterdam, Hamburg, Frankfurt, Vienna, Barcelona, Madrid

GMT +2 (2 o’clock): Athens

3. Press B to exit the setting mode.

• The watch also will return to the Timekeeping Mode if you do not perform any operation for about two or three minutes.

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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.

12 o’clock

• 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 among buildings

• Signal reception normally is 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

• 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 also may cause problems with reception.

• 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.

1,500 kilometers

Rugby

500 kilometers

Inside a vehicle

Near household appliances, office equipment, or a mobile phone

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

Near hightension power lines

Mainflingen

Among or behind mountains

Operation Guide 4791

About 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. The reception schedule (calibration times) depends on the currently selected GMT differential, and whether standard time or Daylight Saving Time is selected for it.

GMT Differential Auto Receive Start Times

GMT +0 Standard Time 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am Midnight

Daylight 2:00 am 3:00 am 4:00 am 5:00 am Midnight 1:00 am Saving Time next day

GMT +1 Standard Time 2:00 am 3:00 am 4:00 am 5:00 am Midnight 1:00 am

Daylight 3:00 am 4:00 am 5:00 am Midnight 1:00 am 2:00 am Saving Time next day next day

GMT +2 Standard Time 3:00 am 4:00 am 5:00 am Midnight 1:00 am 2:00 am

Daylight 4:00 am 5:00 am Midnight 1:00 am 2:00 am 3:00 am Saving Time next day next day next day

Note

• The auto receive operation is performed only if the watch is in the Timekeeping Mode when one of the calibration times is reached. 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 seven minutes everyday when the time in the Timekeeping Mode reaches each of the calibration times. Do not perform any button operation within seven 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 actually is the correct time.

To perform manual receive

READY

WORK

Note

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

• If reception is not successful, the second hand will move to N (NO). One or two

• If the second hand is pointing to Y (YES) or N (NO), you can return to the

Viewing the Latest Signal Reception Results

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

button.

minutes later, the second hand will resume normal operation, without any adjustment of the hand setting.

Timekeeping Mode by pressing any button.

To check the latest signal reception results

Signal Reception Troubleshooting

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

The second hand is pointing at N (NO).

Time setting is incorrect following signal reception.

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

•

You changed the time setting manually.

•

Manual signal reception failed for some reason.

•

The watch was not in the Timekeeping Mode, or you performed some button operation during the auto receive operation.

•

Signal reception results are reset at midnight each day.

• The GMT differential setting is not correct for the area where you are using the watch.

123456

next day

next day next day

1. Place the watch on a stable surface so its 12 o’clock side is facing towards a window.

2. In any mode, hold down A for about two seconds until the second hand moves to READY (R).

• This indicates that the watch is getting ready to receive

the time calibration signal.

• The second hand will move to WORK (W) 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

seven minutes, but in some cases it can take up to 14 minutes. Take care that you do not perform any button operations or move the watch during this time.

• If reception is successful, the second hand will move to

Y (YES). One or two minutes later, the hands will move to the correct time.

Enter the Receive Result Mode.

• If the watch was able to perform a successful signal

receive operation since midnight, the second hand will move to Y (YES). If the watch has been unable to receive any signal successfully, the second hand will move to N (NO).

• To return to the Timekeeping Mode, press A.

• The current receive result is cleared when the first auto

receive operation is performed on the following day. This means Y (YES) indicates successful signal reception since the start of the current day.

• If you have adjusted the time setting manually, the

second hand will indicate N (NO) here.

What you should doProblem Probable Cause

• 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 GMT differential.

Adjusting the Home Positions

If the time 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

• After you complete the home position adjustment procedure, place the watch in a location that allows good time calibration signal reception, and then perform a manual receive operation. See “To perform manual receive” for more information.

1. Enter the Home Position Adjustment Mode.

• If the home position of the second hand currently is correct, it will move to the 12 o’clock position.

• 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 B to move the second hand clockwise in onesecond steps, until it points at 12 o’clock.

3. Press A 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 B to move the hour and minute hands clockwise in 10-second steps, until they point at 12 o’clock.

5. Press A to exit home position adjustment.

• This will cause the watch to return to the Timekeeping Mode. The hour, minute and second hands will indicate the current time.

• Note that all button operations are disabled while the hour and minute hands are moving.

Timekeeping

Use the Timekeeping Mode to set and view the current

Minute hand

Hour hand

Second hand

To adjust the time setting manually

3. Press A to advance to AM/PM switching.

• This will cause the second hand to perform one full rotation starting from its current position (either AM or PM), and then stop at its original current position.

4. Press B to toggle the second hand between AM and PM.

5. Coordinating with a time signal on the radio or TV, press A to restart normal

timekeeping. The second hand will move to 12 o’clock (zero seconds) at the start of timekeeping.

• If you press A without changing the time setting (hour, minute, AM/PM), the second

hand will move to the current time position and timekeeping will resume from there.

• This watch normally receives a time calibration signal late at night. However, if you configure the wrong AM/PM setting in step 3 of the above procedure, the watch will start signal reception automatically during the afternoon. Signal reception during the day is not as good as nighttime reception, so a wrong AM/PM setting can cause signal reception problems.

time. This section also explains how to set the current 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 two or 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.

1. In the Timekeeping Mode, hold down A for about five

seconds.

• This operation causes the second hand to move to AM or

PM in accordance with the current time setting. This is the setting mode.

• The hour and minute hands do not move in the setting mode.

2. Press B to move the time setting forward by one minute.

• Holding down B for about two seconds starts high-speed hand movement. High-speed hand movement will continue until the hands complete a 12-hour cycle, or until you stop them by pressing B.

• If you exit the setting mode after changing the time setting, the second hand will restart timing from 12 o’clock (0 seconds) automatically.

• The AM/PM setting will not change even if you move the hour hand past 12 o’clock in step 2. Use step 3 below to switch between AM and PM.

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.

Auto Return Features

• If you leave the watch in the Home Position Adjustment Mode and Receive Result Mode for two or three minutes without performing any operation, it will return to the Timekeeping Mode automatically.

• If you do not perform any operation for about two or three minutes while a setting mode is selected, the watch will exit the setting mode automatically.

High-speed Hand Movement

• The B button is used to change the hand setting in various setting modes. In most cases, holding down the B 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 any button to stop it.

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