Casio 2628 City Code Table, Initial Screens, Radio-controlledAtomic Timekeeping Precautions, Timekeeping, Power Saving Function, Illumination Precautions

Operation Guide 2628

Initial Screens

When you enter the Alarm or World Time Mode, the data you were viewing when you last exited the mode appears first.

Radio-controlled Atomic Timekeeping Precautions

•Strong electrostatic charge can result in the wrong time being set.

•The time calibration signal is bounced off the ionosphere. Because of this, such factors as changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to higher altitudes due to seasonal atmospheric changes or the time of day may change the reception range of the signal and make reception temporarily impossible.

•Even if the time calibration signal is received properly, certain conditions can cause the time setting to be off by up to one second.

•The current time setting in accordance with the time calibration signal takes priority over any time settings you make.

•The watch is designed to update the date and day of the week automatically for the period January 1, 2000 to December 31, 2099. Setting of the date by the time calibration signal cannot be performed starting from January 1, 2100.

•This watch can receive signals that differentiate between leap years and non-leap years.

•Though this watch is designed to receive both time data (hour, minutes, seconds) and date data (year, month, day), certain signal conditions can limit reception to time data only.

•Normally, the signal reception date shown by the Last Signal screen is the date data included in the received time calibration signal. When only time data is received, however, the Last Signal screen shows the date as kept in the Timekeeping Mode at the time of signal reception.

•If you are in an area where proper time calibration signal reception is impossible, the watch keeps time within ±15 seconds a month at normal temperature.

•If you have problems with proper time calibration signal reception or if the time setting is wrong after signal reception, check your current city code, DST (summer time), and auto receive settings. The following are the initial factory defaults for these settings.

Setting	Initial Factory Default
City code	(New York)
DST (summer time)	(Auto switching)
Auto receive	(Auto receive)

Timekeeping

•Resetting the seconds to 00 while the current count is in the range of 30 to 59 causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are reset to 00 without changing the minutes.

•The day of the week is displayed automatically in accordance with the date (year, month, and day) settings.

•The year can be set in the range of 2000 to 2099.

•The watch’s built-in full automatic calendar makes allowances for different month lengths and leap years. Once you set the date, there should be no reason to change it except after you have the watch’s battery replaced or when battery power drops to Level 4.

•The current time for all city codes in the Timekeeping Mode and World Time Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential for each city, based on the your Home City time setting.

•GMT differential is calculated by this watch based on UTC* data.

*The letters “UTC” stands for “Universal Time Coordinated,” which is the world-wide scientific standard of timekeeping. It is based upon carefully maintained atomic (cesium) clocks that keep accurate to within microseconds. Leap seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s rotation. The reference point for UTC is Greenwich, England.

12-hour/24-hour Timekeeping Formats

The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also applied in all other modes.

•With the 12-hour format, the P (PM) indicator appears on the display for times in the range of noon to 11:59 p.m. and no indicator appears for times in the range of midnight to 11:59 a.m.

•With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without any indicator.

Power Saving Function

When turned on, the Power Saving function enters a sleep state automatically whenever the watch is left in an area where it is dark for a certain period. The table below shows how watch functions are affected by the Power Saving function.

	Elapsed Time	Display	Operation
Power Saving on indicator	in Dark
	60 to 70 minutes	Blank, with the	All functions
		Power Saving	enabled, except for
		on indicator	the display
		flashing
	6 or 7 days	Blank, with the	Beeper tone,
		Power Saving	illumination, display,
		on indicator not	and auto receipt of
		flashing	the calibration signal
			are disabled.

•Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.

•The watch will not enter the sleep state between 6:00 AM and 10:59 PM. If the watch is already in the sleep state when 6:00 AM arrives, however, it will remain in the sleep state.

To recover from the sleep state

Perform any one of the following operations.

•Move the watch to a well-lit area. It can take up to two seconds for the display to turn on.

•Press any button.

•Angle the watch towards your face for reading.

To turn Power Saving on and off

1. In the Timekeeping Mode, hold down A. This causes

Power Saving on indicator							the city code to flash, which indicates the setting
							screen.
							2. Press Aagain.
							3. Press Cseven times until the Power Saving on/off
l	ll						screen appears.
l	l						4. Press Dto toggle Power Saving on (ON) and off
		l
		l
		l	l		l	ll	(OFF).
	l
ll			l			l
			l
						l	5. After the setting is the way you want, press Ato exit
			l
			l			l
				l l l			the setting screen.

•The Power Saving on indicator is on the display in all modes while the Power Saving is turned on.

Illumination Precautions

•The electro-luminescent panel that provides illumination loses power after very long use.

•Illumination may be hard to see when viewed under direct sunlight.

•The watch may emit an audible sound whenever the display is illuminated. This is due to vibration of the EL panel used for illumination, and does not indicate malfunction.

•Illumination turns off automatically whenever an alarm sounds.

•Frequent use of illumination runs down the battery.

Auto light switch precautions

•The auto light switch is turned off automatically whenever battery power is at Level 3.

•Wearing the watch on the inside of your wrist as well as movement or vibration of your arm can cause the auto light switch to activate and illuminate the display. To avoid running down the battery, turn off the auto light switch whenever engaging in activities that might cause frequent illumination of the display.

•Note that wearing the watch under your sleeve while the auto light switch is turned on can cause frequent illumination of the display and can run down the battery.

More than 15 degrees	• Illumination may not turn on if the face of the watch is
too high	more than 15 degrees above or below parallel. Make
	sure that the back of your hand is parallel to the ground.
	• Illumination turns off in about one second, even if you
	keep the watch pointed towards your face.
	• Static electricity or magnetic force can interfere with
	proper operation of the auto light switch. If illumination
	does not turn on, try moving the watch back to the
	starting position (parallel with the ground) and then tilt it
	back towards you again. If this does not work, drop your
	arm all the way down so it hangs at your side, and then
	bring it back up again.

• Under certain conditions, illumination may not turn on until about one second after you turn the face of the watch towards you. This does not necessarily indicate malfunction of the auto light switch.

• You may notice a very faint clicking sound coming from the watch when it is shaken back and forth. This sound is caused by mechanical operation of the auto light switch, and does not indicate a problem with the watch.

City Code Table

City	City		GMT	Other major cities in same time zone
Code			Differential
– – –			–11	Pago Pago
HNL	Honolulu		–10	Papeete
ANC	Anchorage		–9	Nome
LAX	Los Angeles		–8	San Francisco, Las Vegas, Vancouver,
				Seattle/Tacoma, Dawson City, Tijuana
DEN	Denver		–7	El Paso, Edmonton, Culiacan
CHI	Chicago		–6	Houston, Dallas/Ft. Worth,
				New Orleans, Mexico City, Winnipeg
NYC	New York		–5	Montreal, Detroit, Miami, Boston,
				Panama City, Havana, Lima, Bogota
CCS	Caracas		–4	La Paz, Santiago, Pt. Of Spain
RIO	Rio De Janeiro		–3	Sao Paulo, Buenos Aires, Brasilia, Montevideo
– – –			–2
– – –			–1	Praia
GMT		+0		Dublin, Lisbon, Casablanca, Dakar, Abidjan
LON	London
PAR	Paris	+1		Milan, Rome, Madrid, Amsterdam, Algiers, Hamburg,
BER	Berlin			Frankfurt, Vienna, Stockholm
ATH	Athens			Helsinki, Istanbul, Beirut, Damascus,
CAI	Cairo		+2	Cape Town
JRS	Jerusalem
JED	Jeddah	+3		Kuwait, Riyadh, Aden, Addis Ababa, Nairobi, Moscow
THR	Tehran	+3.5		Shiraz
DXB	Dubai	+4		Abu Dhabi, Muscat
KBL	Kabul	+4.5
KHI	Karachi	+5		Male
DEL	Delhi	+5.5		Mumbai, Kolkata
DAC	Dhaka	+6		Colombo
RGN	Yangon	+6.5
BKK	Bangkok	+7		Jakarta, Phnom Penh, Hanoi, Vientiane
HKG	Hong Kong	+8		Singapore, Kuala Lumpur, Beijing, Taipei, Manila, Perth,
				Ulaanbaatar
SEL	Seoul		+9	Pyongyang
TYO	Tokyo
ADL	Adelaide		+9.5	Darwin
SYD	Sydney	+10		Melbourne, Guam, Rabaul
NOU	Noumea	+11		Pt. Vila
WLG	Wellington	+12		Christchurch, Nadi, Nauru Is.

•Based on data as of December 2005.

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