Casio 4304, 4305 Adjusting the Home Positions, Timekeeping, Viewing the Latest Signal Reception Results, GMT, Note, Note, GMT +1, GMT +2, GMT +9, Problem, M(GMT–7), P(GMT–8)

Operation Guide 4304 4305

•Under good reception conditions, signal reception is possible within a radius of about 2,000 miles (3,000 kilometers) from the Fort Collins (the United States) transmitter.

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

•Under good reception conditions, signal reception is possible within a radius of about 1,000 kilometers (600 miles) from the Fukushima and Fukuoka/ Saga (Japan) transmitter.

•At distances further than about 500 kilometers (310 miles) from the Fukushima and Fukuoka/ Saga (Japan) transmitter, signal reception may not be possible during certain times of year or times of day. Radio interferance 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

The watch receives the time calibration signal automatically up to five times a day. When any auto receive is successful, the remaining auto receive operations are not performed. The reception schedule (calibration times) depends on your currently selected Home Time Zone, and whether standard time or Daylight Saving Time is selected for your Home Time Zone.

Your Home Time Zone			Auto Receive Start Times
		1	2	3	4	5
GMT 0	Standard Time	1:00 am	2:00 am	3:00 am	4:00 am	5:00 am
	Daylight Saving Time	2:00 am	3:00 am	4:00 am	5:00 am	Midnight
GMT +1	Standard Time	2:00 am	3:00 am	4:00 am	5:00 am	Midnight
	Daylight Saving Time	3:00 am	4:00 am	5:00 am	Midnight	1:00 am
						next day
GMT +2	Standard Time	3:00 am	4:00 am	5:00 am	Midnight	1:00 am
						next day
	Daylight Saving Time	4:00 am	5:00 am	Midnight	1:00 am	2:00 am
					next day	next day
GMT +9	Standard Time	Midnight	1:00 am	2:00 am	3:00 am	4:00 am
E(GMT –5)	Standard Time and	Midnight	1:00 am	2:00 am	3:00 am	4:00 am
C(GMT –6)	Daylight Saving Time
M(GMT–7)
P(GMT–8)

Note

• When a calibration time is reached, the watch will automatically receive the

calibration signal only if it is in either the Timekeeping Mode or Receive Result

Mode. It is not performed if a calibration time is reached while you are configuring

settings.

Viewing the Latest Signal Reception Results

You can use the Receive Result Mode to check if signal reception was performed correctly.

To check the latest signal reception results

Enter the Receive Result Mode.

•When receive is successful, the display shows the time

that receive was successful. When receive is not

successful, the display shows “xx”.

• To return to the Timekeeping Mode, press A.

• If you adjust the time or date setting manually, The display shows “xx”.

Signal Reception Troubleshooting

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

Problem	Probable Cause	What you should do
Cannot	• The watch is not in the Timekeeping	• Enter the Timekeeping Mode
perform	Mode or Receive Result Mode.	and try again.
manual	• Your current Home Time Zone	• Select 0, +1, +2, +9, E (GMT
receive.	setting is not one of the following: 0,	–5), C (GMT–6), M (GMT–7)
	+1, +2, +9, E (GMT–5), C (GMT–6),	or P (GMT–8) as your Home
	M (GMT–7) or P (GMT–8)	Time Zone.
Auto receive	• You changed the time setting	• Perform manual signal
is not being	manually.	receive or wait until the next
performed	• You were adjusting the watch settings	auto signal receive operation
successfully	when the auto receive start times	is performed.
(“xx”	were reached.	• Check to make sure the
displayed).	• You pressed Awhile signal receive	watch is in a location where it
	was in progress.	can receive the signal.
Time setting	• The Home Time Zone setting is not	• Select the correct Home
is incorrect	correct for the area where you are	Time Zone.
following	using the watch.	• Enter the Home Position
signal	• The home position of the hands is	Adjustment Mode and adjust
reception.	off.	the home position.

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

Adjusting the Home Positions

If the time and date settings are wrong even after the time calibration signal is received normally, use the following procedure to adjust their home positions.

To adjust the home positions

• 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 receive the signal easily.

• The watch receives the calibration signal for two to ten minutes everyday when the

time in the Timekeeping Mode reaches each of the calibration times. Do not perform

any button operation within ten 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 current time 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 displayed

time is actually 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.

The receiving indicator is displayed while an auto or manual receive operation is in progress.

Receiving indicator

Weak	Strong
(Level 0)	(Level 3)

12 o’clock

Correct second hand home position

12 o’clock

Correct hour and minute hand home position

1.While in the Timekeeping Mode, hold down A and B for about five seconds.

•The analog hands do not keep time during home position adjustment.

2.Check the position of the second hand.

•The second hand home position is correct if it is pointing at 12 o’clock.

•If the second hand is not pointing at 12 o’clock, it

means that its home position is off. If this happens, press A to move the second hand clockwise in one- second steps, until it points at 12 o’clock.

•Holding down A for more than two seconds causes the hands to move at high speed. Pressing Aagain stops the hands.

3.Press Bto advance to hour and minute hand home position adjustment.

•If current hour and minute hand alignment is correct, they will both move to 12 o’clock.

4.Check the position of the hour and minute hands.

•If the hour and minute hands are not pointing at 12

o’clock, it means that their home position is off. If this happens, press Ato move the hour and minute hands clockwise in 20-second steps, until they point at 12 o’clock.

•Holding down A for more than two seconds causes the hands to move at high speed. Pressing Aagain stops the hands.

5.Pressing B exits the home position adjustment mode and enters the Timekeeping Mode.

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

Timekeeping

To perform manual receive

Receiving	1. Place the watch on a stable surface so its 6 o’clock side
	is facing towards a window.
	2. Hold down A for about two seconds until R0 starts to
	flash on the display.
	• The second hand will move to 12 o’clock and stay there
	while actual reception is in progress.
	• The hour and minute hands continue to keep time
	normally.
	• Time calibration signal reception takes from two to ten
Receive successful	minutes. Take care that you do not perform any button
	operations or move the watch during this time.
	• When receive is successful, the display shows the time
	that receive was successful.

Minute hand

Hour hand

Date

Second hand

Use the Timekeeping Mode to set and view the current time and date. This section also explains how to set the current date and time manually.

•If you become confused and lose your way during the following procedures, simply put the watch down and do not perform any button operation for about three minutes. This will cause the watch to enter the Timekeeping Mode (indicated by normal one-second movement of the second hand) automatically. After that, you can try performing the manual setting procedure again from the beginning.

•All of the operations in this section are performed in the Timekeeping Mode.

	• The watch will enter the Timekeeping Mode if you press
	A or if you do not perform any button operation for
	about three minutes.
Receive failed	• When receive is unsuccessful, the display shows “xx”.
	The watch will enter the Timekeeping Mode without
	changing the time setting if you press A or if you do not
	perform any button operation for about three minutes.

Note

•To interrupt a receive operation and return to the Timekeeping Mode, press A.

To set the time and date manually

12 o’clock		1. In the Timekeeping Mode, hold down B for about five
		seconds.
		• This will cause the second hand to move to 12 o’clock.
		• The hour and minute hands do not move in the setting mode.
		2. Press Bto cycle through settings in the sequence shown
		below.
	Hold down B.		Press B.
Timekeeping		GMT Differential		DST	Seconds	Hour
Mode		Value
Auto Receive		Day of the	Day	Month	Year	Minutes	2
		Week Language