Casio 2628 Sunrise/Sunset Mode, Signal Receive Troubleshooting, l l, l l, lll, Note, , or, code, Note, ll l, On/off, Press D, Problem, at 3 am, Sunrise, Press C, ll ll l

Receiving indicator

Operation Guide 2628

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

•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.

Reception Range

600 miles	2,000 miles

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.

•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 starts to receive the time calibration signal automatically 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 receives are successful.

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 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 receive the signal easily.

•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. Avoid performing 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 actually is 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.

To display the Last Signal screen

In the Timekeeping Mode, press D to 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.

•If you do not press D to return from the last signal screen to the timekeeping screen, the watch will return automatically after about two or three minutes.

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

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, or
	LAX, DEN, CHI, or NYC.	NYC 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”.

Sunrise/Sunset Mode

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.

Weak	Strong
(Level 1)	(Level 4)

Receiving indicator

• Use the receiving indicator as a guide for checking signal strength and for finding the

best location for the watch during signal receive operations.

• 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.

Sunrise/Sunrise time Sunset graphSunset time

You can use the Sunrise/Sunset Mode to display the sunrise and sunset times for a particular date (year, month, day) specified by you.

•Before trying to use the Sunrise/Sunset Mode, you need to configure settings for the city code, longitude, latitude, and GMT differential for the location whose sunrise and sunset times you want to view.

•The factory default configuration of the location is: Latitude: North 35 degrees; Longitude: East 140 degrees; GMT Differential: +9 hours.

•You can find latitude, longitude, and GMT differential for various cities around the globe in the “Site Data List”.

•The sunrise and sunset information that initially appears when you enter the Sunrise/Sunset Mode is that for the current date as kept in the Timekeeping Mode.

• 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 Dand the message RC! appears to indicatethat 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

•All of the operations in this section are performed in the Sunrise/Sunset Mode, which you enter by pressing C.

To specify a city code to check its sunrise and sunset times1.Enter the Timekeeping Mode.

2.Hold down Auntil the current city code setting starts to flash. This is the setting screen.

3.Use D(Eastward) and B (Westward) to select the city code whose sunrise andsunset times you want to view.• For details about city codes, see the “City Code Table”.4.Press Atwice to exit the setting screen.To configure longitude, latitude and GMT differential settings

1. Enter the Sunrise/Sunset Mode.

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2. Hold down Ato cycle through the screens until the

longitude/latitude setting screen appears.

3. Use B to set the longitude and D to set the latitude.

• Pressing the buttons will change the longitude and

latitude values as shown below.

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Longitude/Latitude

Press this button:

To cycle the value in this sequence:

Setting Screen

Longitude

179°W to 1°W, 0°E to 180°E

▲

Press C.

Latitude

65°S to 1°S, 0°N to 65°N

▲

4. Press Cto display the GMT differential setting screen.

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5. Use D (+) and B(–) to change the GMT differential in

0.5 hour increments.

6. Press Ato exit the setting screen.

• This will cause the display to show the date (year,

timekeeping screen by pressing D.

GMT Differential

month, and day), followed by the sunrise and sunset

To turn auto receive on and off

					1. In the Timekeeping Mode, hold down Auntil the city
					code starts to flash, which indicates the setting screen.
					2. Press Ctwice to move the flashing to the auto receive
					on/off setting.
		lll			3. Press Dto toggle auto receive on (ON) and off (OFF).
ll ll l			l		•
l			l		•
l			l			If the current Home City setting is a city code that
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l	l		l			does not support signal receive, “xx” appears in
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						place of the on/off indicator. This means you cannot
On/off	status					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”.

Setting Screen

time for that date.