Casio 4379, 4378 User Manual

MO0603-EA

Resin Band

Metal Band

Operation Guide 4378 4379

About This Manual

• 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.

General Guide

• Press C to change from mode to mode.

• In any mode, press B to illuminate the display.

Timekeeping Mode

Press C.

▲

Radio-controlled Timekeeping

Hour hand

Minute hand

Day

Day of week

Current Time Setting

This watch automatically adjusts its time setting 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 set your Home City, which is the city where you will normally use the watch. For more information, see “To set your Home City” below.

• When using the watch in an area that is outside of the range of the transmitters in Rugby and Mainflingen, you need to manually adjust the time as required. See “Timekeeping” for information about manual settings.

• The analog time of this watch is synchronized with the digital time. Because of this, the analog time setting is automatically adjusted whenever you change the digital setting. See “Analog Timekeeping” for more information.

To set your Home City

City code

• Normally, your watch should show the correct time as soon as you select your Home City code. If it does not, it should adjust automatically after the next auto receive (in the middle of the night). You can also perform manual receive or you can set the time manually.

• If you are in an area that does not use Daylight Saving Time (summer time), turn off the DST setting.

• 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 city codes and transmitters, see

“Transmitters”.

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 Rugby, England and the signal from Mainflingen, Germany.

Second hand

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

• The second hand will move at high speed to the 12

o’clock position, where it will stop.

2. Use D (east) and B (west) to select the city code you

want to use as your Home City.

• The following are the city codes for major cities in the Western Europe time zones.

LON: London PAR and BER: Paris, Berlin, Milan, Rome,

ATH: Athens

3. Press A to exit the setting screen.

• The second hand will advance at high speed to the correct position in accordance with seconds count of the digital time, and resume normal movement from there.

Amsterdam, Hamburg, Frankfurt, Vienna

▲

Alarm Mode

Stopwatch Mode

Reception Time

2 seconds

Receiving indicator

Seconds

▲

Hour : Minutes

PM indicator

▲

World Time Mode

▲

Hand Setting Mode

▲

To display the digital time and last signal screen

• In the Timekeeping Mode, press A to cycle through the digital time screens as

shown below.

• In the Timekeeping Mode, press D to display the last signal screen. The last signal

screen shows the date and time of the last successful time calibration signal reception.

Date Screen

Day

Press A.

▲

Receiving Indicator and Seconds Count

▲

Current Time

Day of week

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

• Manual Receive

Important!

• When getting ready to receive the time calibration signal, position the watch as

• The watch should not be on its side or facing the wrong way.

• Proper signal reception can be difficult or even impossible under the conditions listed

▲

Press D.

▲

Reception date

Last Signal Screen

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 lets you start time calibration signal reception with the press of a button. For more information, see “To perform manual receive”.

shown in the nearby illustration, with its 12 o’clock side facing towards a window. Make sure there are no metal objects nearby.

below.

2 seconds

Screen

2 seconds

Inside or among buildings

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

Among or behind mountains

Operation Guide 4378 4379

• 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.

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 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.

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

About 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. The start times of the auto receive operations depend on the current Home City and DST settings.

Home City

LON

Standard Time Daylight Saving Time

PAR

Standard Time

BER

Daylight Saving Time

ATH

Standard Time

Daylight Saving Time

Note

• Auto receive is performed only if the watch is in the Timekeeping Mode or World Time Mode when one of the calibration times is reached. It is not performed if a calibration time is reached while an alarm is sounding, or while you are configuring settings (while settings are flashing on the display).

• When a reception starts, the second hand will move at high speed to the 12 o’clock position where it will stop until the reception is complete.

• Auto receive 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 easily receive the signal.

• When auto receive is turned on, 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 time kept 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 Timekeeping Mode time actually is 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.

Receiving indicator

• Even in an area where signal strength is strong, it takes about 10 seconds for signal reception to stabilize enough for the receiving indicator to indicate signal strength.

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

• The Level 4 receiving indicator indicates that at least one of the auto calibration signal receive operation was successful. Note, however, that the Level 4 receiving indicator is cleared from the display when the first auto receive operation of the day is performed.

• The Level 4 receiving indicator appears on the Timekeeping Mode’s Receiving Indicator and Seconds Count screen only. The Level 4 receiving indicator is not displayed if signal reception was unsuccessful or after manual adjustment of the current time setting.

To perform manual receive

Receiving indicator

Auto Receive Start Times

1:00 am 2:00 am

2:00 am

3:00 am

4:00 am

123456

2:00 am

3:00 am

4:00 am

3:00 am

4:00 am

5:00 am

4:00 am

5:00 am

Midnight

Weak

(Level 1)

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

2. In the Timekeeping Mode, hold down D for about two seconds until the watch beeps.

3. Release D and RC flashes to indicate that signal reception has started.

• When a reception starts, the second hand will move at

high speed to the 12 o’clock position where it will stop until the reception is complete.

4:00 am 5:00 am

5:00 am

Midnight

1:00 am next day

Mainflingen

5:00 am Midnight

Midnight

1:00 am next day

1:00 am next day 2:00 am next day

Strong

(Level 4)

Midnight 1:00 am next day

1:00 am next day 2:00 am next day

2:00 am next day 3:00 am next day

• Time calibration signal reception normally 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.

• After signal reception is complete, the display of the watch changes to the last signal screen.

Note

• To interrupt a reception and return to the Timekeeping Mode, press D.

• If the reception is unsuccessful, the message

one or two minutes. After that, the watch returns to the Timekeeping Mode.

• You can also change from the last signal or screen by pressing D.

To turn auto receive on and off

On/Off status

• The second hand will advance at high speed to the correct position in accordance with the digital time seconds count, and resume normal movement from there.

• For information about city codes that support signal reception, see “To set your Home City”.

Signal Reception Troubleshooting

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

Problem

Cannot perform manual receive.

Auto receive is turned on, but the Level 4 receiving indicator does not appear on the Timekeeping Mode display.

Time setting is incorrect following signal reception.

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

1. In the Timekeeping Mode, press D to display the Last

Signal screen.

2. Hold down A until the current auto receive setting (

or OF) starts to flash. This is the setting screen.

•

• Your current Home City is not one of the

• You changed the time setting manually.

• The watch was not in the Timekeeping

• Even if reception is successful, the

• Time data (hour, minutes, seconds) only

• If the time is one hour off, the DST

• The Home City code setting is not

• The second hand will move at high speed to the 12

The watch is not in the Timekeeping Mode.

following city codes: ATH, BER, PA R, or LON.

or World Time Mode, or you were performing some button operation during auto receive.

Level 4 receiving indicator disappears each day when the first auto receive operation of the day is performed.

was received during the last reception. The Level 4 receiving indicator appears only when time data and date data (year, month, day) are both received.

setting may be incorrect.

correct for the area where you are using the watch.

o’clock position, where it will stop.

• Note that the setting screen will not appear if the

currently selected Home City is one that does not support time calibration reception.

3. Press D to toggle auto receive on (

4. Press A to exit the setting screen.

Probable Cause

ERR appears on the display for about

ERR screen to the normal timekeeping

) and off (OF).

What you should do

• Enter the Timekeeping Mode and try again.

• Select AT H, BER, PA R, or LON as your Home City.

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

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

• Change the DST setting to Auto DST .

• Select the correct Home City code.

World Time

City Code

Current time in the selected city code

To view the time in another city

While in the World Time Mode, press D to scroll through the city codes (time zones).

• For full information on city codes, see “City Code Table”.

To toggle a city code time between Standard Time and Daylight Saving Time

DST indicator

• The DST indicator will appear on the display whenever you display a city code for which Daylight Saving Time is turned on.

• Note that you cannot switch between Standard Time and Daylight Saving Time while

GMT is selected as the city code.

• Note that the DST/Standard Time setting affects only the currently displayed city code. Other city codes are not affected.

The World Time Mode digitally displays the current time in 30 cities (29 time zones) around the world.

• Pressing A in the World Time Mode causes the

applicable city code to appear on the digital display for about two seconds.

• If the current time shown for a city is wrong, check your Home City time settings and make the necessary changes.

• The watch will perform a signal reception even if it is in the World Time Mode when a calibration time is reached. If this happens, the World Time Mode time settings will be adjusted in accordance with the Timekeeping Mode’s Home City time.

• All of the operations in this section are performed in the World Time Mode, which you enter by pressing C.

1. In the World Time Mode, use D to display the city code

(time zone) whose Standard Time/Daylight Saving Time setting you want to change.

• Pressing A in the World Time Mode causes the

applicable city code to appear on the digital display for about two seconds.

2. Hold down A to toggle Daylight Saving Time (DST

indicator displayed) and Standard Time (DST indicator not displayed).

• Note that you cannot use the World Time Mode to change the DST setting of the Home City code you currently have selected in the Timekeeping Mode. See “To change the Daylight Saving Time (summer time) setting” for information about turning the Home City code DST setting on and off.

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