Casio 3726 User Manual

MO0405-EA

Resin Band

Metal Band

Operation Guide 3725 3726

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.

Expose the watch to bright light to charge its batteries before using it.

You can use this watch even as its batteries are being charged by exposure to bright light.

• Be sure to read “Power Supply” of this manual for important information you need to know when exposing the watch to bright light.

If the digital display of the watch is blank...

Power saving indicator

General Guide

• Press C to change from mode to mode.

• In any mode, press L to illuminate the digital display areas.

If the Power Saving indicator ( ) is flashing, it means that the display is blank because the watch’s Power Saving function has turned it off to conserve power. Power Saving automatically turns off the display and enters a sleep state whenever your watch is left for a certain period in an area where it is dark. If the watch is kept in the dark for a longer period, the analog hands will also stop moving after a few days.

• The initial factory default setting is Power Saving on.

• The watch will recover from the sleep state if you move it

to a well-lit area, if you press any button, or if you angle the watch towards your face for reading.

• See “Power Saving Function” for more information.

World Time Mode

About This Manual

(Light)

Alarm Mode Countdown Timer Mode

▲

• Depending on the model of your watch, display text appears either as dark figures on a light background, or light figures on a dark background. All sample displays in this manual are shown using dark figures on a light background.

• 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.

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Timekeeping Mode

Press C.

▲

Radio-controlled Timekeeping

Hour hand

Minute hand

Day of week

Seconds

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

3. Press A to exit the setting screen.

• 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.

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.

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

code starts to flash in the bottom dial, which indicates the setting screen.

2. Use D (east) and B (west) to scroll through the city

codes until the one you want to use as your Home City

is displayed.

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

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

Amsterdam, Hamburg, Frankfurt, Vienna, Barcelona, Madrid

Hand Setting Mode

▲

To display the digital time and last signal screen

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

shown below.

• In the Timekeeping Mode, press D to display the last signal screen in the bottom

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

Press B.

Day of week

▲

Press D.

Seconds

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

Day of week

DST indicator

With auto receive, the watch automatically picks up the time calibration signal five times a day at midnight, 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. For more information, see “About Auto Receive”.

Manual receive lets you start a 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.

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Last Signal

Screen

Day

Stopwatch Mode

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Reception time

Hour: Minutes

Seconds

▲

Month. Day

Reception date

Seconds

PM indicator

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 3725 3726

• 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 while time calibration signal reception is in progress.

1,500 kilometers

Rugby

500 kilometers

• This watch is designed to receive the time calibration signal transmitted from Rugby, England and the signal from Mainflingen, Germany. Signal reception is possible within the area represented by a circle with a radius of about 1,500 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.

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

About Auto Receive

When auto receive is turned on, the watch automatically starts to receive the time calibration signal when the time in the Timekeeping Mode reaches midnight, 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. each day (calibration times). The watch will also perform an additional auto receive at 5:00 a.m. if none of the regularly scheduled auto receive operations are successful.

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 a setting is flashing).

• 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 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 five calibration times. Do not perform any button operation within seven minutes before or after any of the five calibration times. Doing so can interfere with correct calibration.

• Remember that reception of the calibration signal depends on the digital time kept by the Timekeeping Mode. Reception will be performed whenever the Timekeeping Mode time reaches one of the five calibration times, regardless of whether or not the Timekeeping Mode time is actually the correct time.

• When two, three, four, or five receptions are successful, the watch uses the data of the last reception for calibration. When only one reception is successful, the watch uses the data of the successful reception.

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

Weak

(Level 0)

• 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 3 receiving indicator remains displayed in all modes following reception of the time calibration signal and calibration of the watch’s time setting. The Level 3 receiving indicator is not displayed if signal reception was unsuccessful or after manual adjustment of the current time setting.

• The Level 3 receiving indicator indicates that at least one of the five calibration signal receive operations was successful. Note, however, that the Level 3 receiving indicator is cleared at 3:00 a.m. each day.

To perform manual receive

Receiving indicator

• 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 while time calibration signal reception is in progress.

• After signal reception is complete, the bottom dial changes to the last signal screen.

Note

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

• If reception is unsuccessful, the message

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

• You can also clear the

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. After you release D, the bottom dial will alternate between the current time and date, and the letters

RC!. This indicates that signal reception is in

progress.

ERR appears in the bottom dial for about

ERR message by pressing D.

Mainflingen

Strong

(Level 3)

Configuring Auto Receive Settings

You can use the procedure in this section to configure the watch to receive the signal of a specific transmitter, or to automatically receive from the transmitter whose signal is strongest. You can also turn off auto receive, if you want.

• Note that you can perform the following procedure only when is selected as your Home City.

To configure auto receive settings

Setting status

3. Use D to cycle through the settings shown below, until the one you want to use is

displayed in the bottom dial.

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

signal screen in the bottom dial.

•

The watch will automatically return to the Timekeeping Mode if you do not perform any button operation for two or three minutes after displaying the last signal screen.

2. Hold down A until the current auto receive setting

flashes in the bottom dial. This is the setting screen.

• If the auto receive setting does not appear when you

hold down A, it means that the city code currently selected for the Home City is for an area that does not support calibration signal reception. You cannot turn auto receive on or off in this case.

LON, BER, or PAR

DCF OFF

AvtA : Auto receive on. The watch automatically selects the transmitter whose

signal is strongest. Signal reception can take up to 14 minutes when this option is selected.

DCF : Auto receive on for reception of the Mainflingen signal. MSF : Auto receive on for reception of the Rugby signal. OFF : Auto receive off.

• For details about transmitters, see “Transmitters”.

4. Press A to exit the setting screen.

• To return to the Timekeeping Mode from the last signal screen, press D.

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

Home City”.

Note

• Manual receive operations are also performed based on the transmitter setting (

AvtA, DCF, MSF) you select above.

• If auto receive is turned off, performing a manual receive operation automatically receives the signal that is strongest.

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 3 receiving indicator does not appear.

Time setting is incorrect following signal reception.

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

Probable Cause

• The watch is not in the Timekeeping Mode.

• Your current Home City is not one of the following city codes: BER, PAR, or

LON.

• You changed the time setting manually.

• The watch was not in the Timekeeping

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

• Even if reception is successful, the Level 3 receiving indicator disappears every day at 3 a.m.

• Time data (hour, minutes, seconds) only was received during the last reception. The Level 3 receiving indicator appears only when time data and date data (year, month, day) are both received.

• If the time is one hour off, the DST setting may be incorrect.

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

What you should do

• Enter the Timekeeping Mode and try again.

• Select BER, PAR, or LON as your Home City.

• Select the appropriate transmitter setting for your current location.

• Perform manual receive or wait until the next auto signal 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

Mode indicator

Current time in selected city

To view the time in another city

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

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

City code

The World Time Mode digitally shows 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 in the bottom dial for about one second.

• 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.

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