Casio MO0603-EA World Time, Signal Receive Troubleshooting, RC, TYO, Note, Note, Module, Module, Problem, Frequency, Transmitter, Home City Code, Probable Cause

Receiving indicator

Operation Guide 2639 2819

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

Inside or	Inside a	Near	Near a	Near high-	Among or
among	vehicle	household	construction	tension	behind
buildings		appliances or	site, airport, or	power lines	mountains
		office	other sources
		equipment,	of electrical
		or a mobile	noise
		phone

•Signal reception is normally better at night than during the day.

•Time calibration signal reception takes from two to six minutes, but in some cases it can take as long as 12 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 U.S. (Fort Collins, Colorado) or Japanese (Fukushima or Fukuoka/Saga) time calibration signal. The signal the watch will attempt to pick up depends on its current Home City code setting as shown below.

Home City Code	Transmitter	Frequency
LAX, DEN, CHI, NYC	Fort Collins, Colorado	60kHz
TYO*	Fukushima	40kHz
	Fukuoka/Saga	60kHz

*With TYO, you can specify either 40kHz or 60kHz.

Reception Ranges

600 miles	500	500
	kilometers
		kilometers
	Fukuoka/Saga
		Fukushima

Fort Collins

•At distances further than about 600 miles (1,000 kilometers) from the transmitter, signal reception may not be possible during certain times of year or times of day. Radio interferance may also cause problems with reception.

•At distances further than about 500 kilometers from the Fukushima and Fukuoka/ Saga transmitter, signal reception may not be possible during certain times of year or times of day. Radio interferance may also cause problems with reception.

•Even when the watch is within the reception range of the transmitter, signal reception is 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 Receive 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 2:00 a.m., 3:00 a.m., 4:00 a.m., and 5:00 a.m. each day (calibration times).

Note

•The auto receive operation 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).

•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 six minutes everyday when the Timekeeping Mode time reaches each of the calibration times. Do not perform any button operation within six 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 is actually the correct time.

•When two, three, or four 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.

Module 2639

Module 2819

Receiving indicator	Weak	Strong
	(Level 1)	(Level 4)

•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 receive operations.

•Following reception of the time calibration signal and calibration of the watch’s time setting, the Level 4 receiving indicator will remain on the display in all modes. The Level 4 receiving indicator will not be displayed if signal reception was unsuccessful or after you adjust the current time setting manually.

•The Level 4 receiving indicator is displayed only when the watch is able to receive both time and date data successfully. It does not appear when only time data is received.

•The Level 4 receiving indicator indicates that at least one of the auto calibration signal receive operations was successful. Note, however, that the Level 4 receiving indicator is cleared from the display at 3:00 a.m. each day.

To perform manual receive

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 Dfor about two seconds until the watch beeps.

•Release D and the message RC! appears to indicate

that signal reception has started.

• Time calibration signal reception takes from two to six 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 receive operation and return to the Timekeeping Mode, press D.

•If the receive operation is unsuccessful, the message ERR appears on the display for about one or two minutes. After that, the watch returns to the Timekeeping Mode.

•You can also change from the Last Signal or ERR screen to the normal timekeeping screen by pressing D.

To configure the auto receive setting for the U.S.

•The following procedure applies when you have LAX,

		DEN, CHI, or NYC selected as your Home City. If
		you are using the watch in Japan, see “To configure auto
		receive settings for Japan”.
		1. In the Timekeeping Mode, hold down Auntil the
		transmitter indicator starts to flash, which indicates the
		setting screen.
		• If TYO is selected as the Home City, you can specify
On/off	status	a transmitter selection mode.

2.Press C three times to move the flashing to the auto receive on/off setting.

3.Press Dto toggle auto receive on (ON) and off (OF).

•If the current Home City setting is a city code that does not support signal receive, “xx” appears in place of the on/off indicator. This means you cannot turn auto receive on or off.

4.Press Atwice to exit the setting screen.

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

To display the Last Signal screen

In the Timekeeping Mode, press Dto display the Last Signal screen (indicated by GET). The Last Signal screen shows the date and time of the last successful time calibration signal reception.

•The last signal screen remains on the display for about one or two minutes. After that, the Timekeeping Mode screen reappears.

PM	Day of week	Receive time
indicator
	Press D.
	▲	▲
	Month – Day	Receive date
		Last Signal Screen
	Hour : Minutes Seconds

Signal Receive Troubleshooting

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

Problem	Probable Cause	What you should do
Cannot perform	• The watch is not in the Timekeeping Mode.	• Enter the Timekeeping Mode
manual receive.	• Your current Home City is not one of the	and try again.
	following city codes:	• Select LAX, DEN, CHI, NYC,
	LAX, DEN, CHI, NYC, or TYO.	or TYO as your Home City.
Auto receive is	• You changed the time setting manually.	• Perform manual signal receive
turned on, but	• The watch was not in the Timekeeping	or wait until the next auto
the Level 4	or World Time Mode, or you performed	signal receive operation is
receiving	some button operation during the auto	performed.
indicator does	receive operation.	• Check to make sure the
not appear on	• Even if receive is successful, the Level 4	watch is in a location where it
the display.	receiving indicator disappears every day	can receive the signal.
	at 3 am.
	• Time data (hour, minutes, seconds) only
	was received during the last receive
	operation. The Level 4 receiving
	indicator appears only when time data
	and date data (year, month, day) are
	both received.
Time setting is	• If the time is one hour off, the DST	• Change the DST setting to
incorrect	setting may be incorrect.	Auto DST.
following signal	• The Home City code setting is not	• Select the correct Home City
reception.	correct for the area where you are using	code.
	the watch.

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

World Time

		City code	World Time shows the current time in 30 cities (29 time
			zones) around the world.
			• For full information on city codes, see the “City Code
			Table”.
			• The current time for all city codes in the World Time
			Mode is calculated in accordance with the Greenwich
			Mean Time (GMT) differential for each city, based on
			your Home City time setting.
			• All of the operations in this section are performed in the
		Home city time	World Time Mode, which you enter by pressing C.
	Current time in the
selected city code

To view the time for another city code

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

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

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