Casio Qw-2609 Troubleshooting guide

SERVICE MANUAL

& PARTS LIST

(WITHOUT PRICE)

QW-2609/2637/2638/2639

MODULE NO.

REF. NO. S/M-803

MAR. 2003

GW-300J MTG-900D MTG-900DA MTG-900DJ

Ver.2 : Nov. 2003

Ver.1 : Jun. 2003

CONTENTS

Page

1. SPECIFICATIONS: MODULE QW-2609/2637/2638/2639 ......................... 1

2. OPERATION CHART: MODULE QW-2609/2637/2638/2639 .................... 2

3. DRAWINGS: MODULE QW-2609/2637/2638/2639

3-1. LCD DIAGRAM ............................................................................................14

3-2. CIRCUIT DIAGRAM .....................................................................................16

3-3. CHECKING TERMINALS AND COMPONENTS .........................................19

4. EXPLODED VIEW: MODULE QW-2609/2637/2638/2639 ........................ 20

5. PARTS LIST: MODULE QW-2609/2637/2638/2639 ................................. 21

6. PRECAUTIONS FOR REPAIR: MODULE QW-2609/2637/2638/2639

6-1. AC (ALL CLEAR) AND REMOVING OF MODULE .....................................25

6-2. ACCURACY CHECKING .............................................................................25

6-3. SOLAR CELL-PCB ASS'Y CONTACT CHECKING....................................26

7. TROUBLESHOOTING: MODULE QW-2609/2637/2638/2639.................. 27

— 1 —

SPECIFICATIONS: MODULE QW-2609/2637/2638/2639

Battery CTL1616 (Storage battery)

Note: Use CTL1616 only. Other storage battery or CR1616 can cause

damage to the watch.

Battery life Approx. 6 month (from full charged condition)

Current consumption 1.135 µA maximum

Alarm system Piezo plate on Cover/Back

Accuracy ±15 sec./month

Accuracy setting system Trimmer capacitor

Accuracy checking See page 26

Item Detail

Functions Accuracy at normal

temperature: ±15 seconds a month (with no signal calibration)

Timekeeping: Hour, minutes, seconds, a.m. (A)/p.m. (P), month, day,

day of the week Time system: Switchable between 12-

hour and 24-hour format

Calendar system: Full Auto-calendar pre-programmed from the year 2000

to 2099

Other: Home city cord (can be assigned one of 34 city cords);

Daylight Saving Time/Standard time

Time Calibration

Signal Receotion:

Auto Receive (four times per day, at 2:00 AM, 3:00 AM, 4:00

AM, and 5:00 AM); Manual Receive; Last Signal screen

Receivable Time

QW-2609/2639: Receivable Time Calibration Signals Fort Collins,

Colorado (Call Sign: WWVB, Frequency: 60kHz)

Fukushima, Japan (Call Sign: JJY, Frequency: 40kHz)

Fukuoka/Saga, Japan(Call Sign: JJY, Frequency: 60kHz)

QW-2637: Receivable Time Calibration Signals

Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5kHz)

QW-2638: Receivable Time Calibration Signals

Fort Collins, Colorado (Call Sign: WWVB, Frequency: 60kHz)

World Time: 30 cities (29 time zones)

Other: Standard time/Daylight Saving Time, Home time (hour,

minutes, a.m. (A)/p.m. (P), and Standard time/Daylight

Saving Time)

Time Recorder: Memory for 30 records, each containing hour, minutes,

seconds, a.m. (A)/p.m. (P), and Standard time/Daylight

Saving Time

Alarms:

Four one-time alarms; one snooze alarm; Hourly Time Signal

Stopwatch

Measuring unit: 1/100 second

Measuring capacity: 23:59' 59.99"

Measuring modes: Elapsed time, split time, two finishes

Other: Backlight (electro-luminescent panel); Auto Light Switch

(Full Auto EL light operates only in the dark);

Battery power indicator; Power Saving function

Battery: One rechargeable battery (type: CTL1616)

Use only the type of battery specified by CASIO. Never

use a different battery type. The wrong type of battery

can damage the watch.

Approximate Battery life:

6 months (from full charge to Level 3 when the watch is

not exposed to light) under the following conditions:

•

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

— 2 —

Reception Range

This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB). The signal that is

received depends on the current Home City setting.

When this Home City is selected: You can receive this signal

Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz)

TYO

LAX, DEN, CHI, NYC

Fort Collins, Colorado signal

1000km

Mt. Hagane

(60kHz)

Mt. Otakadoya

(40kHz)

500km

1000km

500km

Transmitter Locations

•Under optimum conditions, the calibration signal should be

receivable up to 1,000 kilometers from the transmitter. Note

that the wave is relatively weak at distances greater than

500km, so reception may be poor at long distances.

Fort Collins

3000km

1000km

Transmitter Location

•Under optimum conditions, the calibration signal should be

receivable up to 3,000 kilometers from the transmitter. Note

that the wave is relatively weak at distances greater than

1,000km, so reception may be poor at long distances.

What is a radio-controlled watch?

Your radio-controlled watch is designed to receive a time

calibration signal that contains standard time data and adjust its

current time setting accordingly.

Time Calibration Signal

The time calibration signal is the same one used by TV and radio

stations to keep accurate time and sound their time signals. The

standard time data of the time calibration signal is controlled by

cesium beam atomic clock.

Time data

After the watch receives the Japan Standard Time signal, it

performs internal calculations to determine the current time.

Because of this, there may be an error of up to one second in

the displayed time.

Calibration Signal

•The Japanese calibration signal (Call Sign: JJY) is maintained by

the independent Japan Ministry of Posts and Telecommunications

Communication Research Laboratory (CRL). It is a long wave

signal transmitted 24 hours a day from the Mt. Otakadoya

transmitter (40kHz) located in Tamura-gun, Fukushima Prefecture,

and from the Mt. Hagane transmitter (60kHz) located on the

border between Saga Prefecture and Fukuoka Prefecture.

•The U.S. calibration signal (Call Sign: WWVB) is transmitted by

the National Institute of Standards and technology from Fort

Collins, Colorado.

Though the calibration signal is normally transmitted 24 hours

a day, transmission may be interrupted occasionally due to

maintenance, lightening, etc.

Signal data

Transmitter Long-wave time

calibration signal

Inside the watch

Decoding

Watch

Time data

Signal received using

built-in antenna.

Watch decodes

received data

and converts it

to time data.

Time is

adjusted

according to

time data.

Cesium

atomic clock

How a Radio-controlled Watch Works

Time Required for Reception

Signal reception takes anywhere from about two to six minutes.

•Note that when “AUTO”is specified as the frequency selection

mode, signal reception can take up to 12 minutes.

* See “Specifying the Transmitter Selection Mode in Japan”for

more information.

Triggering Reception Manually

In the Timekeeping Mode:

Hold down the Dbutton for

about two seconds.

•The watch beeps and reception

starts. Ongoing reception is

indicated by the icon and the

receive indicator. See “Receive

Icon and Indicator”for more

information.

To interrupt reception

Press the Dbutton.

•All other buttons besides Dare disabled during signal reception.

When reception is successful

The watch terminates reception and adjusts the current time. Next

it beeps and then displays the date and time the adjustment was

performed.

•The icon and the receive indicator remain on the display to

indicate that reception was successful. The icon is cleared

from the display each day at 3:00 a.m.

When reception fails

The watch does not adjust its current time setting, and displays

“ERR”instead.

•The display also return to the normal timekeeping screen

automatically if you do not perform any operation for about one

or two minutes.

Receive Icon and Indicator

While reception is in progress, the

icon and the receive indicator

cycle from “Unstable”through

“Stable”as shown below. How far

they cycle depends on the signal

strength. Keep the watch in a

location where reception is stable

while reception is in progress.

Unstable Stable

Module 2609

Unstable Stable

Module 2639

•Even under optimum reception conditions, it takes at least

10 seconds before reception starts.

•Use the receive icon and receive indicator to check

reception status and to determine the best location for

signal reception.

•Note that weather, the time of day, surroundings, and other

factors can all affect reception.

Location

Reception is difficult and may even be impossible in the locations

described below. Avoid such locations when performing signal

reception.

•You should think of your watch operating like a radio or TV when it

is receiving the calibration signal.

If you are experiencing problems with reception, move away

from the types of locations described above to a location with

better reception, and try again.

Receiving the Calibration Signal

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

signal.

•Auto reception (Reception is performed automatically at 2:00,

3:00, 4:00, and 5:00 each morning.)

•Manual reception (You initiate reception using a button

operation.)

•The watch is set up for auto reception at the factory, so all you

need to do is to place it in a location that allows good reception

each night.

Setting Up to Make Reception Easier

Remove the watch from your wrist and place it somewhere so its

top (12 o’clock side, where the antenna is located) is facing

approximately in the direction of the signal transmitter. Keep the

watch away from metal objects.

Resin band

Metal band

•Orienting the watch so it is sideways to the transmitter makes it

more difficult to receive the signal.

•Do not move the watch while it is receiving the calibration signal.

Near high-voltage lines

Among or near buildings

Next to a household

appliance or office equipment

(TV, speaker, fax, PC, etc.)

Inside a vehicle

(automobile, train, plane, etc.)

Near mountains

In a location where there is

radio interference

(construction site, airport, etc.)

Receive indicator

Receive icon

•Geographic contours, nearby buildings, the season, and the time of day can make reception impossible even when you are within range of

the transmitter.

•Best reception is possible late at night.

쮿

2. OPERATION CHART

2-1. MODULE QW-2609/2639

—3 —

AUTO

With this setting, the watch automatically selects either the

Otakadoya Mountain signal (40kHz) or the Hagane Mountain

signal (60kHz), whichever is strongest.

* The frequency first used by the watch is the one that was

last successful.

With this setting, the watch always receives the Otakadoya

Mountain signal (40kHz).

With this setting, the watch always receives the Hagane

Mountain signal (60kHz).

Turning Auto Reception On and Off

Display the setting screen.

Hold down the Abutton

for two seconds.

Display the transmitter selection mode setting screen.

Press the Cbutton three

times.

Turn auto reception on or off.

Press the Dbutton to

toggle auto reception ON

and OFF.

Exit the setting screen.

Press the Abutton twice.

•This exits the setting screen and returns to the normal

timekeeping screen.

•The display also will return to the normal timekeeping screen

automatically if you do not perform any operation for about

two or three minutes.

Viewing the Last Reception Date and Time

In the Timekeeping Mode:

Press the Dbutton.

• This displays the date and time

that signal reception was

complete and the current time

and date were adjusted.

•To return to the timekeeping

screen, press the Dbutton

again.

•The display also returns to the

normal timekeeping screen

automatically if you do not

perform any operation for about

one or two minutes.

Important!

•The calibration signals received by this watch include two data

groups: an hour-minute-second group and a year-month-day group.

•Both the hour-minute-second

group and year-month-day group

were not received. It will not

remain on the display if only the

hour-minute-second group is

received.

Specifying the Transmitter

Selection Mode in Japan

When Tokyo (TYO) is selected as the Home City, you can select

either of two different transmitters for reception.

Display the setting screen.

Hold down the Abutton

for two seconds.

Select the transmitter selection mode you want.

Press the Dbutton.

Exit the setting screen.

Press the Abutton twice.

•This exits the setting screen and returns to the normal

timekeeping screen.

•The display also will return to the normal timekeeping screen

automatically if you do not perform any operation for about

two or three minutes.

Time setting is incorrect following signal reception.

Possible Cause: •Summer time is turned on or the wrong

Home City is selected.

Corrective Measures: •Turn off summer time so the DST

indicator is not on the display.

•Configure the watch for the correct DST

setting and Home City setting.

•If you cannot receive the calibration signal or if the current time

setting is incorrect after signal reception, check the current setup

of the watch. The following are the watch's factory default

settings, which are configured automatically whenever you have

the battery of the watch replaced.

Auto Receipt

Transmitter

Home City

Summer Time

Auto Japan transmitter select

(40kHz/ 60kHz)

Tokyo

Auto switching in accordance

with signal data

Troubleshooting

Cannot perform manual reception.

Possible Cause: •The watch is not in the Timekeeping Mode

or World Time Mode.

•The Home City is set to a city other than

TYO (Tokyo), NYC (New York), CHI

(Chicago), DEN (Denver), or LAX (Los

Angeles).

Corrective Measures: •Perform manual reception while a time

screen is on the display in the Timekeeping

Mode or World Time Mode only.

•Change Home City To TYO (Tokyo), NYC

(New York), CHI (Chicago), DEN

(Denver), or LAX (Los Angeles).

The icon is not displayed even though auto reception is

turned on.

Possible Cause: •A single receive operation was not

successful.

•Both the hour-minute-second group and

year-month-day group were not received.

•The watch is not in the Timekeeping Mode

or World Time Mode when an auto

reception time is reached.

•You performed manual reception, which

clears the icon from the display.

Corrective Measures: •Check to make sure the watch is in a

location where it can receive the signal.

•Place the watch in a location where

reception conditions are good.

•Make sure that the watch is in the

Timekeeping Mode or World Time Mode

during the auto reception times.

•The icon disappears from the display

whenever you change the current time

setting manually.

Calibration Signal Reception

Precautions

•Auto reception can be performed while the watch is in the

Timekeeping Mode or World Time Mode only.

•Operating any button while auto reception is in progress will

cause the watch to beep and then exit the receive operation.

•Make sure you are within the range of the calibration signal

transmitter before performing the receive operation. Remember

that geographic contours, nearby buildings, the season, and the

time of day can make reception impossible even when you are

within range of the transmitter.

•Proper reception may be impossible if there is something blocking

the signal. If reception is unsuccessful, try again.

•This watch is designed to adjust its current time setting in

accordance with the calibration signals transmitted in Japan and

the United States only. Note that you will need to make your own

adjustments when using this watch outside of Japan or the United

States, or in any area that is outside the range of one of the

receivable time calibration signal transmitters.

•When the watch is unable to adjust its time signal using the

calibration signal for some reason, timekeeping accuracy is within

±15 seconds per month.

•Strong electrostatic charge can cause timekeeping error.

•Signal reception is cancelled if an alarm starts to sound while it is

being performed.

•The watch's calendar shows dates up to the year 2099.

Attempting a receive operation after that causes an error.

•If only the hour-minute-second group is received, the Timekeeping

Mode date at the time of reception is recorded as the last

reception date.

displayed

not displayed

Hour-minute-second group and year-

month-day group received

Hour-minute-second group only received

Not displayed

—4 —

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.

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 ) is on the display, 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 puts the watch into 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

AboutThis Manual

•The operational procedures for Modules 2607 and 2637

are identical. All of the illustrations in this manual show

Module 2607.

•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 2607

Module 2637

(Light)

General Guide

•Press Cto change from mode to mode.

•In any mode, press Lto illuminate the display.

Stopwatch Mode

Timekeeping Mode

Alarm Mode

▲

Press C

▲

World Time Mode

Time Recorder Mode

▲

Timekeeping

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

•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.

•Pressing displays the Last Signal screen (date and time that the time calibration

signal was last received) in theTimekeeping Mode.

Last Signal Screen

▲

Press .

Day of week Receive time

Month –Day

Hour : Minutes Seconds

indicator

▲

Receive date

CurrentTime 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.

•Before using the watch inWestern Europe, first use the procedure under “Setting Up

the Watch for Use in Western Europe”to set the time in accordance with a time

calibration signal.

•Note that after you set your Home City (the city where you normally use the watch)

code, you must also turn on the watch’s time calibration signal receiver if you want to

enable auto time calibration.See “About Auto Receive”for more information.

•See “Setting the Time and Date Manually”for information about manual settings.

Setting Up the Watch for Use inWestern Europe

You need to make the following three settings before using this watch in Western

Europe.The following provides a general overview of the setting procedure.For full

details, see “Setting the Time and Date Manually”and “Time Calibration Signal

Reception.”

•Specify the city code for your Home City (the city where you will normally use the

watch).

•Select the auto summer time (DST) setting.

•Perform the manual time calibration signal receive operation to set the current time.

To set up the watch for use in Western Europe

1. In the Timekeeping Mode, hold down Auntil the city

code starts to flash, which indicates the setting screen.

2. Use (+) and BD

(–) to select the city code you want to

use as your Home City.

•The following are the city codes for major cities in the

Western Europe time zones.

City code

BER and PAR: Berlin, Paris, Milan, Rome,

Amsterdam, Hamburg,

Frankfurt, Vienna

LON: London

3. Press Cto display the summer time (DST) setting

screen.

4. Use to select AUTO (auto DST).

•Auto DST specifies auto switching between Daylight

Saving Time and Standard Time.

5. Press Atwice to exit the setting screen.

6. Hold down for about two seconds until the watch

beeps.

•Release 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 move the watch

during this time.

Module 2637

Receiving indicator

•Position the watch as shown in the nearby illustration, and place it near a window in

a location where there are no nearby metal objects.

•See the information under “Time Calibration Signal Reception”if you experience

problems with time calibration signal reception.

•After signal reception is complete, the display of the watch changes to the Last

Signal screen.

Resin

Band Metal Band

Time Calibration Signal Reception

This watch is designed to pick up a time calibration signal and update its time setting

in accordance with the signal.There are two different methods you can use to receive

the signal: Auto Receive and Manual Receive.With Auto Receive, the watch

automatically receives the calibration signal four times each day and makes

appropriate adjustments.With Manual Receive, you perform a specific button

operation to receive the calibration signal.

•This watch is able to receive the time calibration signal

transmitted from Mainflingen, Germany (located 25

kilometers southeast of Frankfurt). Signal reception is

possible within the area represented by a circle with a

radius of about 1000 kilometers.

At distances further than about 500 kilometers, the

signal may become weak and reception may be

impossible under certain conditions.

•Signal reception may be poor in the shaded area on the

map, even though it is within 1,000 kilometers of the

signal transmitter.

Frankfurt

Module 2607

2-2. MODULE QW-2637

—5 —

Note

•If you are using the time calibration signal to set the time for this watch, be sure to

correctly set your Home City.Otherwise, there is the chance that the watch will not

set the correct time.See “Setting the Time and Date Manually”for details.

•Note that signal reception is possible only when the watch is within range of a time

calibration signal transmitter, and BER, PAR, LON, or ATH is selected as the Home

City code.

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

•The current time setting in accordance with the time calibration signal takes priority

over any time settings you make.

•Auto receive is turned on when the watch is shipped from the factory.

•See the information under “Time Calibration Signal Reception”if you experience

problems with time calibration signal reception.

To perform manual time calibration signal reception

1.Place the watch on a stable surface so its top (12

o'clock side) is facing towards a window.

•Note that signal reception is poor if the watch is on its

back or side.

2.In the Timekeeping Mode, hold down for about two

seconds until the watch beeps.

•Release 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 move the watch

during this time.

•After signal reception is complete, the display of the

watch changes to the Last Signal screen.

•The receiving indicator (Level 4) indicates that the time

calibration reception attempt was successful.

Receiving indicator

Module 2607

Module 2637

Note

•To interrupt a receive operation and return to theTimekeeping Mode, press .

•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 .

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

[Module 2607]

[Module 2637]

(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.

•The receiving indicator (Level 4) remains on the display in all modes following

reception of the time calibration signal and calibration of the watch’s time setting.

The receiving indicator (Level 4) is not displayed if signal reception was

unsuccessful or after manual adjustment of the current time setting.

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 AM, 3:00 AM,

4:00 AM, and 5:00 AM each day (calibration times).

Note

•The auto receive operation is performed only if the watch is in theTimekeeping or

WorldTime Mode when one of the calibration times is reached.

It is not performed if a calibration time is reached while you are making settings

(while settings are flashing on the display) or while an alarm is sounding.

•Auto receipt of the calibration signal is designed to be performed early in the

morning, while you sleep (provided that theTimekeeping 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.

•The receiving indicator (Level 4) indicates that either the 2:00 AM, 3:00 AM, 4:00 AM

or 5:00 AM calibration signal reception was successful.Note, however, that the

receiving indicator (Level 4) is cleared from the display at 3:00 AM each day.

•If you do not see the receiving indicator (Level 4) except for the above reason, it

means there was some problem with the calibration reception operation.Either

perform reception manually, or make sure the watch is set up properly to receive the

time calibration signal for the next automatic reception time.

•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.

•The receiving indicator (Level 4) 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.

•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 date as kept in theTimekeeping Mode at the

time of signal reception.

•When auto receive is turned on, the watch receives the calibration signal for two to

six minutes each day when theTimekeeping Mode time reaches 2:00 AM, 3:00 AM,

4:00 AM, and 5:00 AM. Do not operate any of the watch’s buttons within six minutes

prior to or following 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 2:00 AM, 3:00 AM, 4:00 AM, and 5:00 AM, 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.

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 C twice to move the flashing to the auto receive

on/off setting.

3.Press D

Ato toggle auto receive on (

) and off (

4.Press twice to exit the setting screen.

Setting theTime and Date Manually

Make sure you select your Home City code (the city code whose time and date you

are setting) before 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 theTimekeeping Mode.

Auto

Receive

DSTCity Code

Seconds Hour Minutes

12/24-Hour

Format

Day Month Year

Power Saving

on/off

/ Press A.

Press C.

To set the current time and date manually

1.In the Timekeeping Mode, hold down Auntil the city

code starts to flash, which indicates the setting screen.

2.Press Aor Cto move the flashing in the sequence

shown below to select other settings.

ScreenSetting

City code

DST

Auto Receive

Button Operations

Use (+) and BD

(–) to change the

setting.

Press to toggle between Daylight Saving

Time (

) and Standard Time (

OFF

•Pressing performs a different

operation when BER, PAR, LON or ATH

is selected as Home City Code.See “Auto

Summer Time (DST) Switching.”

Press to toggle auto receive on and off.

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

described below.

12/24-Hour format

Hour, Minutes

Seconds

Year

Month, Day

Power Saving on/off

Press to toggle between 12-hour (12H)

and 24-hour (24H) timekeeping.

Use (+) and BD

(–) to change the

setting.

Press to reset the seconds to 00.

Use (+) and B(–) to change the

setting.

Press to toggle the Power Saving on

(ON) and off (OFF).

4. Press Ato exit the setting screen.

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

Auto Receive”for details.

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

•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.

WorldTime

WorldTime 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

WorldTime Mode, which you enter by pressing C.

Home city time

City code

Current time in the

selected city code

To view the time in another city code

While in the World Time Mode, press 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 yourTimekeeping Mode time and

Home City settings and make the necessary changes.

To toggle a city code time between StandardTime and Daylight SavingTime

1.In the WorldTime Mode, use BDand to display the

city code (time zone) whose Standard Time/Daylight

Saving Time setting you want to change.

2.Hold down Ato toggle Daylight SavingTime (DST

displayed) and StandardTime (DST 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 StandardTime. Remember that the

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 WorldTime Mode when a calibration time is

reached.If this happens, the WorldTime Mode time

settings will be adjusted in accordance with the Home

City time.

DST indicator

ON OFF

—6 —

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 theTime Recorder is to record the start time and the end time of a

particular event.

To record aTime 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

Home city time

Recorded time

(Hour : Minutes Seconds)

To recall Time Recorder times

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

memory.

•If you recorded a newTime 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 allTime Recorder times

In the Time Recorder Mode, hold down Ato delete allTime 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

Alarm time (Hour : Minutes)

Alarm number

Home city time

To set an alarm time

1.In the Alarm Mode, use 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 Auntil the hour

setting of the alarm time starts to flash, which indicates

the setting screen.

•This operation automatically turns on the alarm.

3.Use Cto move the flashing in the sequence shown

below to select other settings.

MinutesHour

AL1 AL2 AL3

AL4SIG SNZ

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

change it.

5.Press C

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.(Aindicator)

or p.m. (Pindicator).

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 repeats up to seven times

every five minutes until you turn the alarm off.

•Pressing any button stops the alarm tone operation.

•If any alarm operation (one-time alarm, snooze) occurs while a signal receive

operation is in progress, the receive operation is canceled.

•Displaying theTimekeeping Mode setting screen during a 5-minute interval between

snooze alarms stops the current snooze alarm operation (but snooze alarm remains

as the alarm type setting).

•The snooze on indicator (SNZ) flashes during the 5-minute intervals between

alarms.

•The alarm on indicator ( ), snooze on indicator (SNZ), and Hourly Time Signal on

indicator ( ) are displayed in all modes.

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

AL1

through

AL4

, or

SNZ

) that is currently turned on.

•Alarm operations and the Hourly Time Signal operation are performed in all modes.

To test the alarm

•In the Alarm Mode, hold down B

to sound the alarm.

To select the alarm operation type

1.In the Alarm Mode, use to select the screen for the

alarm (

AL1

through

AL4

, or

SNZ

) whose alarm

type you want to select.

2.Press Ato cycle through the available settings in the

sequence shown below.

Alarm/

Snooze on

Alarm/

Snooze off

•The alarm on indicator ( ) or snooze on indicator

(SNZ) is displayed for each alarm (1 through 4, snooze)

for which alarm on is selected.

•In other modes besides the Alarm Mode, the alarm

name indicator is displayed for each alarm for which

alarm on is selected.

Alarm on indicator

Snooze on indicator

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

AL1

through

AL4

, or

SNZ

) that is currently turned on.

To turn the HourlyTime Signal on and off

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

Signal (SIG).

2.Press Ato toggle it on ( displayed) and off ( not

displayed).

•The Hourly Time Signal on indicator ( ) is shown on the

display in all modes while this function is turned on.

Hourly time signal

on indicator

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.

1/100 second

Hours

Home city time

Seconds

Minutes

Start Stop

ElapsedTime

Re-start ClearStop

SplitTime

Start Split Split release Clear

Stop

Two Finishes

Start Split Stop Clear

Split release

First runner

finishes.

Display time of

first runner.

Second runner

finishes. Display time of

second runner.

To measure times with the stopwatch

(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 Lto illuminate the display for about one second.

•The above operation turns on the backlight regardless of the current auto light

switch setting.

Auto light switch

on indicator

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.

More than

Parallel to

ground

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 Lfor about two seconds to toggle the auto light switch on

(displayed) or off ( not displayed).

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

light switch is turned on.

—7 —

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.

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.

Solar cell

•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

Battery Power

Indicator

Charge Soon Alert

Function Status

All functions enabled.

Beeper tone, backlight,

calibration signal

reception, display, and

buttons are disabled.

All functions, including

timekeeping, are

disabled.

Module 2607 Module 2637

•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 set 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 ) 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) 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

ChargeTimes

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

used by the above operating conditions.

•Stable operation is promoted by frequent charging.

Exposure Level (Brightness) Approximate

ExposureTime

Outdoor Sunlight (50,000 lux) 5 minutes

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

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

Indoor Fluorescent Lighting (500 lux) 8 hours

RecoveryTimes

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 ExposureTime

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.

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 theTime Recorder Mode or Alarm Mode for two or three

minutes without performing any operation, it automatically changes to the

Timekeeping Mode.

•If you leave a screen with flashing digits or a cursor 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 Band Dbuttons 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.

Time Calibration Signal Reception

•Reception is best when the antenna built into the 12 o'clock edge of the watch is

facing in the general direction of the signal transmitter. Note, however, that moving

the watch while the time calibration signal receive operation is taking place will make

stable reception impossible.

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

below.

•Radio interference can make signal reception impossible.

•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.

Inside or

among

buildings

Inside a

vehicle Near

household

appliances or

office

equipment

Near a

construction

site, airport, or

other sources

of electrical

noise

Near high-

tension

power lines

Among or

behind

mountains

•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.

•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.

•If you are in an area where proper time calibration signal reception is impossible, the

watch keeps time with the precision noted in “Specifications.”

•Check the following points whenever you experience problems with your watch.

Problem

Cannot perform

manual receive.

Auto receive is

turned on, but

the receiving

indicator (Level

4) does not

appear on the

display.

Probable Cause

•

The watch is not in theTimekeeping Mode.

•You do not select one of the following

City Codes as your Home City Code:

BER, PAR, LON, or ATH.

•You changed the time setting manually.

•The watch was not in theTimekeeping

or World Time Mode, or you were

performing some button operation

during the auto signal receive operation

was performed.

•

Even if receive is successful, the

receiving indicator (Level 4) disappears

every day at 3am.

What you should do

•Enter the Timekeeping Mode

and try again.

•Select the correct Home City

Code.

•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.

Time setting is

incorrect

following signal

reception.

•Time data (hour, minutes, seconds) only

was received during the last receive

operation.The receiving indicator (Level

4) 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.

•Change the DST setting to

Auto DST.

•Select the correct Home City

Code.

—8 —

ATHENS

CAIRO

JERUSALEM

JEDDAH

TEHRAN

DUBAI

KABUL

KARACHI

DELHI

DHAKA

YANGON

BANGKOK

HONG KONG

TOKYO

SEOUL

ADELAIDE

SYDNEY

NOUMEA

WELLINGTON

+3.5

+4.5

+5.5

+6.5

+9.5

+10

+11

+12

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

PORTVILA

CHRISTCHURCH, NADI, NAURU ISLAND

ATH

CAI

JRS

JED

THR

DXB

KBL

KHI

DEL

DAC

RGN

BKK

HKG

TYO

SEL

ADL

SYD

NOU

WLG

Auto SummerTime (DST) Switching

The time calibration signal transmitted from Mainflingen, Germany includes both

Standard Time and summer time (Daylight Saving Time) data.When auto summer

time (DST) switching is turned on, the watch switches between Standard Time and

summer time (DST) automatically in accordance with the calibration signal.

•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.

•When using the watch within the reception range of the Mainflingen transmitter, and

BER, PAR, LON, or ATH is selected as the Home City code, select Auto DST to turn

on the auto summer time setting.

•The default summer time setting is Auto DST whenever you select BER, PAR, LON

or ATH as your Home City code.

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

probably best to switch between StandardTime and summer time (Daylight Saving

Time) manually.

•See “To set the current time and date manually”for information about configuring

summer time (DST) settings manually.

Auto DST(

AUTO

DST off(

OFF

) DST on(

)

To select the auto summer time setting

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

indicates the setting screen.

2. Press C

Cand the summer time (DST) setting screen appears.

3. Use to cycle through the summer time settings in the sequence shown below.

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

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 automatically 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 MeanTime (GMT) differential for each

city, based on the your Home City time setting.

•GMT differential is calculated by this watch based on Universal Time Coordinated

(UTC*) data.

The letters “UTC”stands for “UniversalTime 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-hourTimekeeping 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 puts the watch into a sleep

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

ElapsedTime

in Dark

60 to 70 minutes

6 or 7 days

Display

Blank, with Sleep indicator (S )

flashing

Blank, with Sleep indicator (S )

not flashing

Operation

All functions enabled, except

for the display

Beeper tone, backlight, display,

and auto receipt of the

calibration signal are disabled.

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 Aagain.

3. Press C

seven times until the Power Saving on/off

screen appears.

4. Press to toggle Power Saving on (

) and off

(

OFF

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

the setting screen.

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 life.

Auto light switch precautions

•Wearing the watch on the inside of your wrist and 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.

More than 15

degrees too high

HONOLULU

ANCHORAGE

LOS ANGELES

DENVER

CHICAGO

NEWYORK

CARACAS

RIO DE JANEIRO

LONDON

PARIS

BERLIN

City City GMT Other major cities in same time zone

Code

Differential

City CodeTable

–––

HNL

ANC

LAX

DEN

CHI

NYC

CCS

RIO

–––

GMT

LON

PAR

BER

–11

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

PAGO PAGO

PAPEETE

NOME

SAN FRANCISCO, LASVEGAS,VANCOUVER,

SEATTLE, DAWSON CITY

EL PASO, EDMONTON

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

•Based on data as of June 2002.

•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.

—9 —

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.

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.

AboutThis Manual

•The operational procedures for Modules 2608 and 2638

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

Module 2638

(Light)

If the display of the watch is blank...

If the sleep indicator (S ) is on the display, 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 puts the watch into 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 Cto change from mode to mode.

•In any mode, press Lto illuminate the display.

Stopwatch Mode

Timekeeping Mode

Alarm Mode

▲

Press C.

▲

World Time Mode

Time Recorder Mode

▲

Timekeeping

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

•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.

•Pressing displays the Last Signal screen (date and time that the time calibration

signal was last received) in theTimekeeping Mode.

Last Signal Screen

▲

Press .

Day of week Receive time

Month –Day

Hour : Minutes Seconds

indicator

▲

Receive date

CurrentTime 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.

•Before using the watch in the Continental United States, first use the procedure

under “Setting Up the Watch for Use in the Continental United States”to set the time

in accordance with a time calibration signal.

•Note that after you set your Home City (the city where you normally use the watch)

code, you must also turn on the watch’s time calibration signal receiver if you want to

enable auto time calibration.See “About Auto Receive”for more information.

•See “Setting the Time and Date Manually”for information about manual settings.

Setting Up the Watch for Use in the Continental United States

You need to make the following three settings before using this watch in the

Continental United States.The following provides a general overview of the setting

procedure.For full details, see “Setting the Time and Date Manually”and “Time

Calibration Signal Reception.”

•Specify the city code for your Home City.

•Select the auto summer time (DST) setting.

•Perform the manual time calibration signal receive operation to set the current time.

To set up the watch for use in the Continental United States

1. In the Timekeeping Mode, hold down Auntil the city

code starts to flash, which indicates the setting screen.

2. Use (+) and BD (–) to select the city code you want to

use as your Home City.

•The following are the city codes for major cities in the

Continental United States time zones.

LAX (P indicator) : Los Angeles, San Francisco, Las

Vegas, Seattle

DEN (M indicator) : Denver, El Paso

City code

E/C/M/P indicator

CHI (C indicator) : Chicago, Houston, Dallas/Fort

Worth,

New Orleans

NYC (E indicator) : New York, Detroit, Miami, Boston

3. Press C

to display the summer time (DST) setting

screen.

4. Use to select AUTO (auto DST).

•Auto DST specifies auto switching between Daylight

Saving Time and Standard Time.

5. Press Atwice to exit the setting screen.

Receiving indicator

Module 2608

Module 2638

6.Hold down for about two seconds until the watch

beeps.

•Release 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 move the watch

during this time.

•Position the watch as shown in the nearby illustration,

and place it near a window in a location where there are

no nearby metal objects.

•See the information under “Time Calibration Signal Reception”if you experience

problems with time calibration signal reception.

•After signal reception is complete, the display of the watch changes to the Last

Signal screen.

Resin

Band Metal Band

Time Calibration Signal Reception

This watch is designed to pick up a time calibration signal and update its time setting

in accordance with the signal.There are two different methods you can use to receive

the signal: Auto Receive and Manual Receive.With Auto Receive, the watch

automatically receives the calibration signal four times each day and makes

appropriate adjustments.With Manual Receive, you perform a specific button

operation to receive the calibration signal.

•This watch is able to receive the time calibration signal

transmitted from Fort Collins, Colorado. Under good

reception conditions, signal reception is possible within

a radius of about 2,000 miles (3,000 kilometers) from

the Fort Collins transmitter.

•At distances further than about 600 miles (1,000

kilometers) from the Fort Collins transmitter, the signal

may become weak and reception may be impossible

under certain conditions.

Fort Collins

600 miles

2,000 miles

•This watch automatically receives a time calibration

signal in the middle of the night, when reception is best.

Note

•If you are using the time calibration signal to set the time for this watch, be sure to

correctly set your Home City. Otherwise, there is the chance that the watch will not

set the correct time.See “Setting the Time and Date Manually”for details.

•Note that signal reception is possible only when the watch is within range of a time

calibration signal transmitter, and a city code that supports signal reception is

selected as the Home City code.

•The current time setting in accordance with the time calibration signal takes priority

over any time settings you make.

•Auto receive is turned on when the watch is shipped from the factory.

•See the information under “Time Calibration Signal Reception”if you experience

problems with time calibration signal reception.

2-3. MODULE QW-2638

—10 —

Press to toggle between 12-hour (12H)

and 24-hour (24H) timekeeping.

Use (+) and BD

(–) to change the

setting.

Press to reset the seconds to 00.

Use (+) and BD

(–) to change the

setting.

Press to toggle the Power Saving on

(ON) and off (OFF).

To perform manual time calibration signal reception

1.Place the watch on a stable surface so its top (12

o'clock side) is facing towards a window.

•Note that signal reception is poor if the watch is on its

back or side.

2.In the Timekeeping Mode, hold down for about two

seconds until the watch beeps.

•Release 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 move the watch

during this time.

•After signal reception is complete, the display of the

watch changes to the Last Signal screen.

•The receiving indicator (Level 4) indicates that the time

calibration reception attempt was successful.

Receiving indicator

Module 2608

Module 2638

Note

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

•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 .

About the Receiving Indicator

The receiving indicator shows the strength of the calibration signal being received. For