Casio 2608 Users Manual QW 2638 2688

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Operation Guide 2608 2638 2688

1

MO0306-EA

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your

purchase, be sure to carefully read this manual and keep it on hand for later reference

when necessary.

••

••

•This watch does not have a time zone that corresponds to the Greenwich

Mean Time differential of –3.5 hours. Because of this, the radio-controlled

timekeeping and World Time functions will not display the correct time for

Newfoundland, Canada.

Expose the watch to bright light to charge its battery before using it.

You can use this watch even as its battery is being charged by exposure to bright

light.

••

••

•Be sure to read “Battery” of this manual for important information you need

to know when exposing the watch to bright light.

If the display of the watch is blank...

If the sleep indicator (S /SLEEP ) is on the display, it

means that the display is blank because the watch’s

Power Saving function has shut it to conserve power.

Power Saving automatically turns off the display and

enters a sleep state whenever your watch is left in an

area where it is dark for a certain period.

•The initial factory default setting is Power Saving on.

•The watch recovers from the sleep state if you move it

to a well-lit area*, if you press any button, or if you

angle the watch towards your face for reading.

* It can take up to two seconds for the display to turn on.

•See “Power Saving Function” for more information.

Sleep indicator

General Guide

•Press C to change from mode to mode.

•In any mode, press L to illuminate the display.

Stopwatch Mode

Timekeeping Mode

Alarm Mode

▲

▲

▲

Press C.

▲

World Time Mode

Time Recorder Mode

▲

Radio-controlled Atomic Timekeeping

This watch receives a time calibration signal and updates

its time setting accordingly. The time calibration signal

includes both Standard Time and Daylight Saving Time

(summer time) data.

•This watch is designed to pick up the time calibration

signal transmitted from Fort Collins, Colorado (USA).

Reception is possible within North America*.

*

The term “North America” in this User’s Guide refers to the

area that consists of Canada, the continental United States,

and Mexico.

Current Time Setting

This watch automatically adjusts its time setting in accordance with a time calibration

signal. You can also perform a manual procedure to set the time and date, when

necessary.

•The first thing you should do after purchasing this watch is to set your Home City,

which is the city where you will normally use the watch. For more information, see

“To set your Home City” below.

•When using the watch outside of the range of the transmitter in Fort Collins, you

need to manually adjust the time as required. See “Timekeeping” for information

about manual settings.

To set your Home City

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Use D(east) and B(west) to select the city code you

want to use as your Home City.

•The following are the city codes for major cities in

North America.

LAX(P (Pacific) indicator):

Los Angeles, San Francisco, Las Vegas, Seattle,

Vancouver, Tijuana

DEN(M (Mountain) indicator):

Denver, El Paso, Edmonton, Culiacan

CHI(C (Central) indicator):

Chicago, Houston, Dallas/Fort Worth, New Orleans,

Winnipeg, Mexico City

NYC(E (Eastern) indicator):

New York, Detroit, Miami, Boston, Montreal

•Note that this watch does not have a city code that

corresponds to Newfoundland.

3. Press A twice to exit the setting screen.

•The first press of A displays the 12/24-hour setting

screen. Pressing A again exits the setting screen.

Important!

•Normally, your watch should show the correct time as soon as you select your Home

City code. If it does not, it should adjust automatically after the next auto receive

operation (in the middle of the night). You can also perform manual receive or you

can set the time manually.

•If you are in an area that does not use Daylight Saving Time (summer time), turn off

the DST setting.

Time Calibration Signal Reception

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

auto receive and manual receive.

Day of week

Month – Day

Hour : Minutes Seconds

PM

indicator

City code

E/C/M/P indicator

•Auto Receive

With auto receive, the watch automatically picks up the time calibration signal four

times a day at 2:00 a.m., 3:00 a.m., 4:00 a.m., and 5:00 a.m. For more information,

see “About Auto Receive”.

•Manual Receive

Manual receive lets you start a time calibration receive operation with the press of a

button. For more information, see “To perform manual receive”.

Important!

•When getting ready to receive the time calibration signal, position the watch as

shown in the nearby illustration, with its 12 o’clock side facing towards a window.

Make sure there are no metal objects nearby.

Resin Band Metal Band

Inside or

among

buildings

Inside a

vehicle

Near

household

appliances or

office

equipment,

or a mobile

phone

Near a

construction

site, airport, or

other sources

of electrical

noise

Near high-

tension

power lines

Among or

behind

mountains

•The watch should not be on its side or facing the wrong way.

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

listed below.

•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.

About This Manual

•The operational procedures for Modules 2608, 2638 and 2688 are identical. All of

the illustrations in this manual show Module 2608.

•Button operations are indicated using the letters shown in the illustration.

•Each section of this manual provides you with the information you need to perform

operations in each mode. Further details and technical information can be found in

the “Reference” section.

Module 2608

(Light)

Module 2638

(Light)

Module 2688

(Light)

•Under good reception conditions, signal reception is possible within a radius of

about 2,000 miles (3,000 kilometers) from the Fort Collins transmitter.

2,000 miles

Fort Collins

600 miles

Operation Guide 2608 2638 2688

2

•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.

•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.

•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

successfully receive both time and date data. 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 D for 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 turn auto receive on and off

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Press C twice to move the flashing to the auto receive

on/off setting.

3. Press D to 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 A twice 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 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.

Receiving indicator

On/off status

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

Signal Receive Troubleshooting

Check the following points whenever you experience problems with calibration signal

reception.

Last Signal Screen

▲

Press D.

Day of week Receive time

Month – Day

Hour : Minutes Seconds

PM

indicator

▲

Receive date

Problem

Cannot perform

manual receive.

Auto receive is

turned on, but

the Level 4

receiving

indicator does

not appear on

the display.

Time setting is

incorrect

following signal

reception.

Probable Cause

•

The watch is not in the Timekeeping Mode.

•Your current Home City is not one of the

following city codes:

LAX, DEN, CHI, or NYC.

•You changed the time setting manually.

•The watch was not in the Timekeeping

or World Time Mode, or you performed

some button operation during the auto

receive operation.

•

Even if receive is successful, the Level

4 receiving indicator disappears every

day 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.

•If the time is one hour off, the DST

setting may be incorrect.

•The Home City code setting is not

correct for the area where you are using

the watch.

What you should do

•Enter the Timekeeping Mode

and try again.

•Select LAX, DEN, CHI, or

NYC as your Home City.

•Perform manual signal receive

or wait until the next auto

signal receive operation is

performed.

•Check to make sure the

watch is in a location where it

can receive the signal.

•Change the DST setting to

Auto DST.

•Select the correct Home City

code.

•For further information, see “Important!” under “Time Calibration Signal Reception”

and “Radio-controlled Atomic Timekeeping Precautions”.

World Time

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 the

your Home City time setting.

•All of the operations in this section are performed in the

World Time Mode, which you enter by pressing C.

To view the time for another city code

While in the World Time Mode, press D to 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.

To toggle a city code time between Standard Time and Daylight Saving Time

1. In the World Time Mode, use B and D to display the

city code (time zone) whose Standard Time/Daylight

Saving Time setting you want to change.

2. Hold down A to toggle Daylight Saving Time (DST

indicator displayed) and Standard Time (DST indicator

not displayed).

•The DST indicator is on the display whenever you

display a city code for which Daylight Saving Time is

turned on.

•Note that the DST/Standard Time setting affects only the

currently displayed city code. Other city codes are not

affected.

•Daylight Saving Time (DST) advances the time setting

by one hour from Standard Time. Remember that not all

countries or even local areas use Daylight Saving Time.

•The watch will perform a signal receive operation even if

it is in the World Time Mode when a calibration time is

reached. If this happens, the World Time Mode time

settings will be adjusted in accordance with the Home

City time.

Current time in the

selected city code

Home city time

City code

DST indicator

Module 2608

Module 2638

Module 2688

DST indicator

Time Recorder

The Time Recorder lets you store up to 30 records of the

current time (month, day, hour, minutes, seconds, and

DST on/off setting) with the touch of a button. One way

you can use the Time Recorder is to record the start time

and the end time of a particular event.

To record a Time Recorder time

In the Timekeeping Mode, hold down B to record the

Home City time (month, day, hour, minutes, seconds, and

DST on/off setting).

•The recorded time flashes for about two seconds, and

then it is assigned a record number. After that, the

Timekeeping Mode screen appears.

•Records are assigned numbers sequentially from #01

through #30.

•Storing a new time record when there are already 30

records stored in memory automatically deletes record

#01, shifts the remaining records upwards by 1, and

stores the new record as #30.

Time record number

Recorded time

(Hour : Minutes seconds)

Recorded date

(Month–Day)

Strong

Receiving indicator

Weak

(Level 1)

Module 2608

Module 2638

Modules 2608,

2638, and 2688

(Level 4)

Operation Guide 2608 2638 2688

3

To recall Time Recorder times

In the Time Recorder Mode, use D (+) and B (–) to scroll through times stored in

memory.

•If you recorded a new Time Recorder time since you last entered the Time Recorder

Mode, the newest record appears first. If you have not recorded a new time, the

record you were viewing when you last exited the Time Recorder Mode appears

first.

To delete all Time Recorder times

In the Time Recorder Mode, hold down A to delete all Time Recorder times.

Alarms

The Alarm Mode gives you a choice of four one-time

alarms and one snooze alarm.

Also use the Alarm Mode to turn the Hourly Time Signal

(SIG) on and off.

•There are five alarms numbered AL1 through AL4,

and SNZ. You can configure SNZ as a snooze alarm

only. Alarms AL1 through AL4 can be used as one-

time alarms only.

•Alarm settings (and Hourly Time Signal settings) are

available in the Alarm Mode, which you enter by

pressing C.

To set an alarm time

1. In the Alarm Mode, use D to scroll through the alarm

screens until the one whose time you want to set is

displayed.

2. After you select an alarm, hold down A until the hour

setting of the alarm time starts to flash, which indicates

the setting screen.

•This operation automatically turns on the alarm.

3. Use C to move the flashing between the hour and

minute settings.

4. While a setting is flashing, use D (+) and B (–) to

change it.

5. Press A to exit the setting screen.

•When setting the alarm time using the 12-hour format,

take care to set the time correctly as a.m. (A indicator)

or p.m. (P indicator).

Alarm Operation

The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the

watch is in. In the case of the snooze alarm, the alarm operation is performed a total

of seven times, every five minutes, or until you turn the alarm off.

•Pressing any button stops the alarm tone operation.

•Performing any one of the following operations during a 5-minute interval between

snooze alarms cancels the current snooze alarm operation.

Displaying the Timekeeping Mode setting screen

Displaying the snooze alarm setting screen

To test the alarm

In the Alarm Mode, hold down B to sound the alarm.

To turn an alarm on and off

1. In the Alarm Mode, use D to select an alarm.

2. Press B to toggle it on and off.

•Turning on a one-time alarm (AL1, AL2, AL3,

AL4) displays the alarm on indicator on its Alarm Mode

screen. Turning on the snooze alarm (SNZ) displays

the alarm on indicator and snooze alarm indicator on its

Alarm Mode screen.

•In all modes, the alarm on indicator is shown for any

alarm that is currently turned on. When the snooze

alarm is on, the snooze alarm indicator is displayed in

all modes.

•The alarm on indicator flashes while the alarm is

sounding.

•The snooze alarm indicator flashes during the 5-minute

intervals between alarms.

To turn the Hourly Time Signal on and off

1. In the Alarm Mode, use D to select the Hourly Time

Signal (SIG).

2. Press B to toggle it on (Hourly Time Signal on

indicator displayed) and off (Hourly Time Signal on

indicator not displayed).

•The Hourly Time Signal on indicator is displayed in all

modes when the Hourly Time Signal is turned on.

Alarm time (Hour : Minutes)

Alarm number

Home city time

AL1 AL2 AL3

SIG SNZ AL4

Module 2688

Hourly time signal

on indicator

Module 2608

Module 2638

Module 2688

1/100 second

Hours

Home city time

Seconds

Minutes

D

Start Stop

Elapsed Time

➤

Re-start Clear

D➤

Stop

D➤D➤B

Split Time

D

Start Split

➤

Split release Clear

B➤

Stop

B➤D➤B

Two Finishes

D

Start Split

➤

Stop Clear

B➤

Split release

D➤B➤B

First runner

finishes.

Display time of

first runner.

Second runner

finishes.

Display time of

second runner.

To measure times with the stopwatch

(SPL/

SPL

displayed)

Backlight

The backlight uses an EL (electro-luminescent) panel that

causes the entire display to glow for easy reading in the

dark. The watch’s auto light switch automatically turns on

the backlight when you angle the watch towards your face

in the dark.

•The auto light switch must be turned on (indicated by

the auto light switch on indicator) for it to operate.

•See “Backlight Precautions” for other important

information about using the backlight.

To turn on the backlight manually

In any mode, press L to illuminate the display for about

one second.

•The above operation turns on the backlight regardless

of the current auto light switch setting.

About the Auto Light Switch

Turning on the auto light switch causes the backlight to turn on for about one second,

whenever you position your wrist as described below in any mode. Note that this

watch features a “Full Auto EL Light,” so the auto light switch operates only when

available light is below a certain level. It does not turn on the backlight under bright

light.

Moving the watch to a position that is parallel to the ground and then tilting it

towards you more than 40 degrees causes the backlight to turn on.

Warning!

•Always make sure you are in a safe place whenever you are reading the

display of the watch using the auto light switch. Be especially careful when

running or engaged in any other activity that can result in accident or injury.

Also take care that sudden illumination by the auto light switch does not

surprise or distract others around you.

•When you are wearing the watch, make sure that its auto light switch is turned

off before riding on a bicycle or operating a motorcycle or any other motor

vehicle. Sudden and unintended operation of the auto light switch can create

a distraction, which can result in a traffic accident and serious personal injury.

To turn the auto light switch on and off

In any mode, hold down L for about two seconds to toggle the auto light switch on

(auto light switch on indicator displayed) or off (auto light switch on indicator not

displayed).

•The auto light switch on indicator is on the display in all modes while the auto light

switch is turned on.

Battery

This watch is equipped with a solar cell and a rechargeable battery (secondary

battery) that is charged by the electrical power produced by the solar cell. The

illustration shown below shows how you should position the watch for charging.

Example: Orient the watch so its face

is pointing at a light source.

• Note that charging efficiency drops

when any part of the solar cell is

blocked by clothing, etc.

• The illustration shows how to position

a watch with a resin band.

Auto light switch on indicator

Module 2608

Module 2638

Module 2688

Solar cell

Stopwatch

The stopwatch lets you measure elapsed time, split times,

and two finishes.

•The display range of the stopwatch is 23 hours, 59

minutes, 59.99 seconds.

•The stopwatch continues to run, restarting from zero

after it reaches its limit, until you stop it.

•Exiting the Stopwatch Mode while a split time is frozen

on the display clears the split time and returns to

elapsed time measurement.

•The stopwatch measurement operation continues even

if you exit the Stopwatch Mode.

•All of the operations in this section are performed in the

Stopwatch Mode, which you enter by pressing C.

Alarm on indicator

Module 2638

Snooze on indicator

Module 2608

Alarm on indicator

More than

40

°

Parallel to

ground

Operation Guide 2608 2638 2688

4

Important!

•Storing the watch for long periods in an area where there is no light or wearing it in

such a way that it is blocked from exposure to light can cause rechargeable battery

power to run down. Be sure that the watch is normally exposed to bright light

whenever possible.

•This watch employs a solar cell that converts light into electricity that charges a built-

in rechargeable battery. Normally, the rechargeable battery should not need

replacement, but after very long use over a number of years, the rechargeable

battery may lose its ability to achieve a full charge. Should you notice problems with

getting the rechargeable battery to a full charge, contact your dealer or CASIO

distributor about having the rechargeable battery replaced.

•The rechargeable battery should be replaced with a CASIO-specified CTL1616

battery only. Other rechargeable batteries can cause damage to the watch.

•All data stored in memory is deleted, and the current time and all other settings

return to their initial factory defaults whenever battery power drops to Level 4 and

when you have the battery replaced.

•Turn on the watch’s Power Saving function and keep it in an area normally exposed

to bright light when storing it for long periods. This helps to keep the rechargeable

battery from going dead.

Battery Power Indicator

The battery power indicator on the display shows you the current status of the

rechargeable battery’s power.

Battery power

indicator

Recover

indicator

Level

1

2

3

4

Battery Power Indicator

Charge Soon Alert

Function Status

All functions enabled.

All functions enabled.

Beeper tone, backlight,

calibration signal

reception, display, and

buttons are disabled.

All functions, including

timekeeping, are

disabled.

Module 2608 2638 2688

•The Level 3 charge warning indicator tells you that battery power is very low, and

that exposure to bright light for charging is required as soon as possible.

•At Level 4, all functions are disabled and settings return to their initial factory

defaults. Functions are enabled once again after the rechargeable battery is

charged, but you need to set the time and date after the battery reaches Level 3

from Level 4. You will not be able to configure any of the other settings until the

battery reaches Level 2 after dropping to Level 4.

•Leaving the watch in direct sunlight or some other very strong light source can

cause the battery power indicator to temporarily show a reading that is actually

higher than the battery level. The correct battery power indicator should appear after

a few minutes.

•If you use the backlight or the alarms a number of times during a short period, the

recover indicator (R /RECOVER ) appears on the display and the following

operations become disabled until battery power recovers.

Backlight

Beeper tone

Calibration reception

After some time, battery power will recover and the recover indicator (R/

RECOVER ) will disappear, indicating that the above functions are enabled again.

Charging Precautions

Certain charging conditions can cause the watch to become very hot. Avoid leaving

the watch in the areas described below whenever charging its rechargeable battery.

Also note that allowing the watch to become very hot can cause its liquid crystal

display to black out. The appearance of the LCD should become normal again when

the watch returns to a lower temperature.

Warning!

Leaving the watch in bright light to charge its rechargeable battery can cause it

to become quite hot. Take care when handling the watch to avoid burn injury.

The watch can become particularly hot when exposed to the following

conditions for long periods.

•On the dashboard of a car parked in direct sunlight

•Too close to an incandescent lamp

•Under direct sunlight

Charging Guide

After a full charge, timekeeping remains enabled for up to about six months, while the

watch is used under the conditions described below.

Operating Conditions

•

Watch is not exposed to light

•

Display on 18 hours per day, sleep state 6 hours per day

•

1 backlight operation (1.5 seconds) per day

•

10 seconds of alarm operation per day

•

4 times calibration reception per day

Charge Times

Exposing the watch to light for the periods shown below each day restores the power

used by the above operating conditions.

Exposure Level (Brightness) Approximate

Exposure Time

Outdoor Sunlight (50,000 lux) 5 minutes

Sunlight Through a Window (10,000 lux) 24 minutes

Daylight Through a Window on a Cloudy Day (5,000 lux) 48 minutes

Indoor Fluorescent Lighting (500 lux) 8 hours

•Stable operation is promoted by frequent charging.

Recovery Times

The table below shows the amount exposure that is required to take the battery from

one level to the next.

Exposure Level

(Brightness)

Outdoor Sunlight

(50,000 lux)

Sunlight Through a

Window (10,000 lux)

Daylight Through a

Window on a Cloudy

Day (5,000 lux)

Indoor Fluorescent

Lighting (500 lux)

Approximate Exposure Time

Level 4 Level 3 Level 2 Level 1

1 hour 14 hours 3 hours

3 hours 70 hours 14 hours

5 hours 143 hours 28 hours

57 hours ------------ ------------

▲

▲

▲

•The above exposure time values are all for reference only. Actual required exposure

times depend on lighting conditions.

Timekeeping

Use the Timekeeping Mode to set and view the current time and date. This section

also explains how to manually set the current date and time.

•The watch is equipped with a Time Recorder feature that lets you record the current

Home City time (month, day, hour, minutes, seconds, and DST on/off setting) with

the touch of a button. See “To record a Time Recorder time” for more information.

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

you can enter by pressing C.

Setting the Time and Date Manually

Make sure you select your Home City code before you change the current time and

date settings. World Time Mode times are all displayed in accordance with the

Timekeeping Mode settings. Because of this, World Time Mode times will not be

correct if you do not select the proper Home City code before setting the time and

date in the Timekeeping Mode.

To set the current time and date manually

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Press A or C to move the flashing in the sequence

shown below to select other settings.

Last Signal Screen

▲

Press D.

Day of week Receive time

Month – Day

Hour : Minutes Seconds

PM

indicator

▲

Receive date

City/Auto receive

Settings

Time/Date/Power

Saving Settings

Auto

Receive

DSTCity Code

Seconds Hour Minutes

12/24-Hour

Format

Day Month Year

Power Saving

on/off

/ Press A.

Press C.

C

A

C

City code

3. When the setting you want to change is flashing, use B and/or D to change it as

described below.

Screen: To do this:

Change the city code

Cycle between Daylight Saving Time

(ON), Standard Time (OFF), and

Auto DST (AUTO)

Toggle between auto receive on

(ON) and off (OFF)

Do this:

Use D (east) and B (west).

Press D.

Press D.

City/Auto Receive Settings

•See “City Code Table” for a complete list of available city codes.

Screen: To do this:

Toggle between 12-hour (12H) and

24-hour (24H) timekeeping

Reset the seconds to 00

Change the hour or minutes

Change the month, day, or year

Toggle the Power Saving on (ON)

and off (OFF)

Do this:

Press D.

Press D.

Use D (+) and B (–).

Use D (+) and B (–).

Press D.

Time/Date/Power Saving Settings

4. Use A to exit the setting screen.

•If a City/Auto Receive Setting screen is displayed, press A twice.

•If a Time/Date/Power Saving Setting screen is displayed, press A once.

Note

•Auto DST (AUTO) can be selected only while HNL, ANC, LAX, DEN, CHI, or

NYC is selected as the Home City code. For more information, see “Daylight Saving

Time (DST)” below.

•The auto receive setting is used for time calibration signal reception only. See

“About Auto Receive” for details.

Operation Guide 2608 2638 2688

5

Daylight Saving Time (DST)

Daylight Saving Time (summer time) advances the time setting by one hour from

Standard Time. Remember that not all countries or even local areas use Daylight

Saving Time.

The time calibration signal transmitted from Fort Collins includes both Standard Time

and DST data. When the Auto DST setting is turned on, the watch switches between

Standard Time and DST (summer time) automatically in accordance with the received

time signal.

•The default DST setting is Auto DST (AUTO) whenever you select HNL, ANC,

LAX, DEN, CHI, or NYC as your Home City code.

•If you experience problems receiving the time calibration signal in your area, it is

probably best to switch between Standard Time and Daylight Saving Time (summer

time) manually.

To change the Daylight Saving Time (summer time) setting

1. In the Timekeeping Mode, hold down A until the city code starts to flash, which

indicates the setting screen.

2. Press C and the DST setting screen appears.

3. Use D to cycle through the DST settings in the sequence shown below.

4. When the setting you want is selected, press A twice to exit the setting screen.

Reference

This section contains more detailed and technical information about watch operation.

It also contains important precautions and notes about the various features and

functions of this watch.

Auto Return Features

•If you leave the watch in the Time Recorder Mode or Alarm Mode for two or three

minutes without performing any operation, it automatically returns to the

Timekeeping Mode.

•If you leave a screen with flashing digits on the display for two or three minutes

without performing any operation, the watch automatically saves anything you have

input up to that point and exits the setting screen.

Data and Setting Scrolling

The B and D buttons are used in various modes and setting screens to scroll

through data on the display. In most cases, holding down these buttons during a scroll

operation scrolls through the data at high speed.

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.

•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.

•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 automatically update the date and day of the week 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.

Auto DST (

AUTO

) DST off (

OFF

) DST on (

ON

)

Setting

City code

DST (summer time)

Auto receive

Initial Factory Default

NYC (New York)

DST (Auto switching)

AUTO

(Auto receive)

ON

Timekeeping

•The day of the week is automatically displayed 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 the A (AM) 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 automatically enters a sleep state

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.

•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

the city code to flash, which indicates the setting

screen.

2. Press A again.

3. Press C seven times until the Power Saving on/off

screen appears.

4. Press D to toggle Power Saving on (ONON

ONON

ON) and off

(OFFOFF

OFFOFF

OFF).

5. After the setting is the way you want, press A to exit

the setting screen.

•The Power Saving on indicator is on the display in all

modes while the Power Saving is turned on.

Backlight Precautions

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

use.

•The illumination provided by the backlight 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.

•The backlight automatically turns off whenever an alarm sounds.

•Frequent use of the backlight shortens the battery operating time.

Auto light switch precautions

•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.

•The backlight may not light if the face of the watch is

more than 15 degrees above or below parallel. Make

sure that the back of your hand is parallel to the ground.

•The backlight 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 the backlight

does not light, try moving the watch back to the starting

position (parallel with the ground) and then tilt it back

toward 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, the backlight may not light

until about one second after you turn the face of the

watch towards you. This does not necessarily indicate

malfunction of the backlight.

•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.

Elapsed Time

in Dark

60 to 70 minutes

6 or 7 days

Display

Blank, with Sleep indicator (S /

SLEEP ) flashing

Blank, with Sleep indicator (S /

SLEEP ) not flashing

Operation

All functions enabled, except

for the display

Beeper tone, backlight, display,

and auto receipt of the

calibration signal are disabled.

l

l

l

l

l

l

l

l

l

l

l

l

Power saving on

indicator

More than 15 degrees

too high

Operation Guide 2608 2638 2688

6

HONOLULU

ANCHORAGE

LOS ANGELES

DENVER

CHICAGO

NEW YORK

CARACAS

RIO DE JANEIRO

LONDON

PARIS

BERLIN

ATHENS

CAIRO

JERUSALEM

JEDDAH

TEHRAN

DUBAI

KABUL

KARACHI

DELHI

DHAKA

YANGON

BANGKOK

HONG KONG

SEOUL

TOKYO

ADELAIDE

SYDNEY

NOUMEA

WELLINGTON

City City GMT Other major cities in same time zone

Code

Differential

City Code Table

– – –

HNL

ANC

LAX

DEN

CHI

NYC

CCS

RIO

– – –

– – –

GMT

LON

PAR

BER

ATH

CAI

JRS

JED

THR

DXB

KBL

KHI

DEL

DAC

RGN

BKK

HKG

SEL

TYO

ADL

SYD

NOU

WLG

–11

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

+0

+1

+2

+3

+3.5

+4

+4.5

+5

+5.5

+6

+6.5

+7

+8

+9

+9.5

+10

+11

+12

PAGO PAGO

PAPEETE

NOME

SAN FRANCISCO, LAS VEGAS, VANCOUVER,

SEATTLE, DAWSON CITY, TIJUANA

EL PASO, EDMONTON, CULIACAN

HOUSTON, DALLAS/FORT WORTH,

NEW ORLEANS, MEXICO CITY, WINNIPEG

MONTREAL, DETROIT, MIAMI, BOSTON,

PANAMA CITY, HAVANA, LIMA, BOGOTA

LA PAZ, SANTIAGO, PORT OF SPAIN

SAO PAULO, BUENOS AIRES, BRASILIA,

MONTEVIDEO

PRAIA

DUBLIN, LISBON, CASABLANCA, DAKAR,

ABIDJAN

MILAN, ROME, MADRID, AMSTERDAM, ALGIERS,

HAMBURG, FRANKFURT, VIENNA, STOCKHOLM

HELSINKI, ISTANBUL, BEIRUT, DAMASCUS,

CAPE TOWN

KUWAIT, RIYADH, ADEN, ADDIS ABABA, NAIROBI,

MOSCOW

SHIRAZ

ABU DHABI, MUSCAT

MALE

MUMBAI, KOLKATA

COLOMBO

JAKARTA, PHNOM PENH, HANOI, VIENTIANE

SINGAPORE, KUALA LUMPUR, BEIJING, TAIPEI,

MANILA, PERTH, ULAANBAATAR

PYONGYANG

DARWIN

MELBOURNE, GUAM, RABAUL

PORT VILA

CHRISTCHURCH, NADI, NAURU ISLAND

•Based on data as of December 2002.