Casio 2736 Owner's Manual

MA0310-EA

Display Illumination

Pressing the B button in any mode (except when a setting screen is on the display) illuminates the digital display for about 1.5 seconds for easy reading in the dark.

Important!

• The light may be difficult to see if you turn it on under bright sunlight.

• The light is shut off automatically if the alarm starts to sound while it is on.

• You may notice a slight sound from the watch while the display is illuminated. This is the sound of EL panel vibration, and does not indicate malfunction.

Operation Guide 2736

Modes and Display Screens

Each press of the C button sounds a confirmation tone and cycles through available modes in the sequence shown below.

Timekeeping Mod World Time Mode

(Light)

Button

(Mode switching)

Switching Between Digital Display Screens

Each press of the A button cycles the digital display in the sequence shown below.

Calendar Screen

Month

day Day of

the Week

Month

Day

Month

Timekeeping Screen

PM indicator (no display for AM)

Day Seconds Screen

Days of the Week

SUN : Sunday MON : Monday TUE : Tuesday WED : Wednesday THU : Thursday FRI : Friday SAT : Saturday

Button

Seconds

Hour Minutes

Seconds

City Code

World Time

Hand Setting Mode

Current time

Mode Indicator

• The watch will automatically revert to the Timekeeping Mode if you leave it in the Alarm Mode, Date Alarm Mode, or Hand Setting Mode without performing any operation for about two or three minutes.

Alarm Mode Date Alert Mode

Day

Month

Alarm Type

Alarm Time

Date Alert Number

Stopwatch Mode Time Stamp Mode

Current time

Time

Standby Screen

Operation Guide 2736

How a Radio-controlled Watch Works

What is a radio-controlled watch?

Yo ur radio-controlled watch is designed to receive a time calibration signal that contains standard time data and adjust its current time setting accordingly.

Signal is received using

Transmitter

Cesium atomic clock

After the watch receives the Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the displayed time.

Long-wave time calibration signal

Signal data

Time data

Watch

Internally

built-in antenna.

Decode

Watch decodes received data and converts it to time data.

Time is adjusted according to time data.

Location

Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.

• You should think of your watch operating like a radio or TV when it is receiving the calibration signal.

Among or near buildings

Inside a vehicle (automobile, train, plane, etc.)

In a location where there is radio interference (construction site, airport, etc.)

If you are experiencing problems with reception, move away from the types of locations described above to a location with better reception, and try again.

Near high-voltage lines

Next to a household appliance or office equipment (TV, speaker, fax, PC, mobile phone, etc.)

Near mountains

Calibration Signal

• The Japanese calibration signal (Call Sign: JJY) is maintained by the independent Japan Ministry of Posts and Telecommunications Communication Research Laboratory (CRL). It is a long wave signal transmitted 24 hours a day from the Mt. Otakadoya transmitter (40kHz) located in Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane transmitter (60kHz) located on the border between Saga Prefecture and Fukuoka Prefecture.

• The U.S. calibration signal (Call Sign: WWVB) is transmitted by the National Institute of Standards and technology from Fort Collins, Colorado.

Though the calibration signal is normally transmitted 24 hours a day, transmission may be interrupted occasionally due to maintenance, lightening, etc.

Receiving the Calibration Signal

There are two methods you can use to receive the time calibration signal.

• Auto reception (Reception is performed automatically at 2:00, 3:00, 4:00, and 5:00 each morning.)

• Manual receive (You initiate reception using a button operation.)

• The watch is set up for auto reception at the factory, so all you

need to do is to place it in a location that allows good reception each night.

❚

Setting Up to Make Reception Easier

Remove the watch from your wrist and place it somewhere so its top (12 o’clock side, where the antenna is located) is facing approximately in the direction of the signal transmitter. Keep it away from metal objects.

Resin band

Metal band

• Orienting the watch so it is sideways to the transmitter makes it more difficult to receive the signal.

• Do not move the watch while it is receiving the calibration signal.

Reception Range

This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB). The signal that is received depends on the current Home City setting.

• For information about selecting a Home City, see “To set the time and date manually”.

Home City

TYO

LAX, DEN, CHI, NYC

Transmitter Location

Mt. Hagane (60kHz)

• Under optimum conditions, the calibration signal should be receivable up to 1,000 kilometers from the transmitter.

• Note that the wave is relatively weak at distances greater than 500km, so reception may be poor at long distances.

• Geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

• Best reception is possible late at night.

❚

Time Required for Reception

Signal reception takes anywhere from about two to six minutes.

• Note that when “A/T” (auto) is specified as the transmitter mode, signal reception can take up to 12 minutes.

• See “To specify the transmitter mode” for more information.

❚

To trigger reception manually

Hold down the about two seconds.

• The watch beeps and reception starts. The current time digits flash and the receive icon changes to “ ” while a signal receive operation is in progress.

❚

To stop signal reception

Press the

• All other buttons besides D are disabled during signal reception.

500km

D button for

D D

D button.

D D

Either the Mt. Otakadoya signal (40kHz) or the Mt.Hagane signal (60kHz)

Fort Collins, Colorado signal

1000km

Mt. Otakadoya (40kHz)

500km

1000km

❚

The receive indicator cycles from “Unstable” through “Stable” as shown below while reception is in progress. How far it cycles depends on the signal strength. Keep the watch in a location where reception is stable while reception is in progress.

• Even under optimum reception conditions, it can take about

When reception is successful

The watch terminates reception and adjusts the current time. Next it beeps and then displays the date and time the adjustment was performed.

• The “ ” icon on the display also indicates successful signal reception.

When reception fails

The watch does not adjust its current time setting, and displays “ERR” instead.

• The display will return to the normal timekeeping screen automatically if you do not perform any operation for about one or two minutes.

Transmitter

Transmitter Location

1000km

Fort Collins

• Under optimum conditions, the calibration signal should be receivable up to 3,000 kilometers from the transmitter.

• Note that the wave is relatively weak at distances greater than 1,000km, so reception may be poor at long distances.

3000km

Receive icon

Unstable Stable

10 seconds for reception to stabilize.

• Use the receive icon to check reception status and to determine the best location for signal reception.

• Note that weather, the time of day, surroundings, and other factors can all affect reception.

❚

To view the last reception date and time

interval

D button.

In the Timekeeping Mode, press the

• This displays the date and time that signal reception was complete and the current time and date were adjusted.

• The month and day screen and hour and minute screen alternate at two-second intervals.

• To return to the Timekeeping Mode, press the D button again.

• The display will return to the normal timekeeping screen

automatically if you do not perform any operation for about one or two minutes.

2-second

Important!

• The calibration signals received by this watch include two data groups: an hour-minute-second group and a year-month-day group.

• The “ ” icon is displayed only when both the hour-minute-second group and year-month-day group are received. It will not remain on the display if only the hour-minute-second group is received.

Hour-minute-second group and year-month-day group received “ ” displayed Hour-minute-second group only received “ ” not displayed

• If only hour, minute, and second data (no date data) is received, the last reception date shows the date that the receive operation was performed (as kept in the Timekeeping Mode).

Operation Guide 2736

❚

To specify the Transmitter Mode

When TYO (Tokyo) is selected as the Home City, you can select either of two different transmitters for reception.

• For information about selecting a Home City, see “To set the time and date manually”.

• The initial factory default settings of the watch are TYO (Tokyo) for the Home City, and A/T (auto) for the transmitter mode.

1. In the Timekeeping Mode,

hold down the for about two seconds until the transmitter selection mode setting flashes on the display.

• This is the setting screen.

A button

2. Press the

• A/T

With this setting, the watch automatically selects either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz), whichever is strongest.

• The transmitter that was last received successfully is given priority for the next receive operation.

• JPN 40

With this setting, the watch always receives the Mt. Otakadoya signal (40kHz).

• JPN 60

With this setting, the watch always receives the Mt. Hagane signal (60kHz).

3. When the city code you

• This exits the setting screen.

• The display also will exit the setting screen automatically if

you do not perform any operation for about two or three minutes.

D button to

cycle through the available transmitter select mode settings, described below.

want is displayed, press

the

A button twice to exit

the setting screen.

Turning Auto Reception on and off

1. In the Timekeeping Mode,

hold down the for about two seconds until the transmitter selection mode setting flashes on the display.

• This is the setting screen.

2. Press the

times.

• This causes the current auto receive setting (On or OF) to flash on the display.

3. Press the

toggle auto reception on or off.

• Press the D button to toggle auto reception ON and OFF.

• On

Auto receive is turned on.

• OF

Selecting this setting turns off auto receive and auto transmitter selection.

A button

C button three

D button to

(Three times)

4. When the city code you

want is displayed, press

the

A button twice to exit

the setting screen.

• This exits the setting screen.

• The display also will exit the setting screen automatically if

you do not perform any operation for about two or three minutes.

Calibration Signal Reception Precautions

• Auto reception can be performed while the watch is in the Timekeeping Mode or World Time Mode only.

• Receipt of a calibration signal causes the digital time to be adjusted first, followed by adjustment of the analog time. In order to ensure correct correction of the analog time, be sure to match the analog time with the digital time before performing a signal receive operation.

• Note that analog timekeeping is not performed during signal reception, so the time indicated by the analog hands may be wrong.

• Operating any button while auto reception is in progress will cause the watch to beep and then exit the receive operation.

• Make sure you are within the range of the calibration signal transmitter before performing the reception operation. Remember that geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

• Proper reception may be impossible if there is something blocking the signal. If reception is unsuccessful, try again.

• This watch is designed to adjust its current time setting in accordance with the calibration signal transmitted in Japan and the United States only. Note that you will need to make your own adjustments when using this watch outside of Japan or the United States, or in any area that is outside the range of one of the receivable time calibration signal transmitters.

• When the watch is unable to adjust its time signal using the calibration signal for some reason, timekeeping accuracy is within ±20 seconds per month.

• Strong electrostatic charge can cause timekeeping error.

• Signal reception is cancelled if an alarm starts to sound while it

is being performed.

• The watch’s calendar shows dates up to the year 2039. Attempting a receive operation after that causes an error.

Troubleshooting

Cannot perform manual reception.

Cause: • Manual receive can be performed in the

Corrective Measures: • Perform manual receive in the

The

“ ”

icon is not on the display even though auto signal

reception is turned on.

Cause: • The “ ” icon appears after the

Corrective Measures: • Check to make sure the watch is in a

Timekeeping Mode only.

• The Home City is set to a city other than TYO (Tokyo), NYC (New York), CHI (Chicago), DEN (Denver), or LAX (Los Angeles).

Timekeeping Mode.

• Change Home City to TYO (Tokyo), NYC (New York), CHI (Chicago), DEN (Denver), or LAX (Los Angeles). For details, see “To set the time and date manually”.

watch successfully receives the calibration signal and adjusts the current time setting.

• A single receive operation was not successful.

• The “ ” icon is displayed only when both the hour-minute-second group and yearmonth-day group were received. It will not remain on the display if only the hourminute-second group is received.

• The watch is not in the Timekeeping Mode or World Time Mode when an auto reception time is reached.

location where it can receive the signal.

• Place the watch in a location where reception conditions are good.

• Make sure that the watch is in the Timekeeping Mode or World Time Mode during the auto reception times.

• Note that manual reception also clears the “ ” icon from the display.

Time setting is incorrect following signal reception.

Cause: • Summer time is turned on or the wrong

Corrective Measures: • If the time is advanced by one hour, it

If you cannot receive the calibration signal or if the current time setting is incorrect after signal reception, check the current setup of the watch.

• The following are the watch’s factory default settings, which are configured automatically whenever you have the battery of the watch replaced.

Transmitter

Home City

Summer Time

Auto Receive

Home City is selected.

probably means that summer time (indicated by the DST indicator on the display) is turned on. If the time is off by more than one hour, it probably means that the Home City is selected. Correctly configure the summer time and Home City settings as detailed under “To set the time and date manually”.

Auto Japan transmitter select (40kHz/ 60kHz)

Tokyo

Auto (according to signal data)

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