Casio QW-2609, QW-2637, QW-2639, GW-300J, MTG-900D Service Manual & Parts List

SERVICE MANUAL

& PARTS LIST

REF. NO. S/M-803

MAR. 2003

MODULE NO.

QW-2609/2637/2638/2639

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

Ver.2 : Nov. 2003
Ver.1 : Jun. 2003

R

(WITHOUT PRICE)

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

Item Detail

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
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 12­hour 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:

Receivable Time

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

QW-2637: Receivable Time Calibration Signals
QW-2638: Receivable Time Calibration Signals
World Time: 30 cities (29 time zones)

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

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

Alarms:
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

Battery: One rechargeable battery (type: CTL1616)

Approximate Battery life:

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

Colorado (Call Sign: WWVB, Frequency: 60kHz)
Fukushima, Japan (Call Sign: JJY, Frequency: 40kHz)
Fukuoka/Saga, Japan(Call Sign: JJY, Frequency: 60kHz)

Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5kHz)
Fort Collins, Colorado (Call Sign: WWVB, Frequency: 60kHz)

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

seconds, a.m. (A)/p.m. (P), and Standard time/Daylight
Saving Time
Four one-time alarms; one snooze alarm; Hourly Time Signal

(Full Auto EL light operates only in the dark);
Battery power indicator; Power Saving function

Use only the type of battery specified by CASIO. Never
use a different battery type. The wrong type of battery
can damage the watch.

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

— 1 —

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 D button 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

D

button.

• All other buttons besides D are 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

쮿

쮿

2. OPERATION CHART
2-1. MODULE QW-2609/2639

— 2 —

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.

40

With this setting, the watch always receives the Otakadoya

Mountain signal (40kHz).

60

With this setting, the watch always receives the Hagane

Mountain signal (60kHz).

T urning Auto Reception On and Off

1.

Display the setting screen.

Hold down the A button

for two seconds.

2.

Display the transmitter selection mode setting screen.

Press the C button three

times.

3.

Turn auto reception on or off.

Press the D button to

toggle auto reception ON

and OFF.

4.

Exit the setting screen.

Press the A button 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 D button.

• 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 D button

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.

1.

Display the setting screen.

Hold down the A button

for two seconds.

2.

Select the transmitter selection mode you want.

Press the D button.

3.

Exit the setting screen.

Press the A button 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

On

Auto Japan transmitter select

(40kHz/ 60kHz)

To

kyo

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

— 3 —

2-2. MODULE QW-2637

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...

Sleep indicator

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
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.

, if you press any button, or if you angle

*

General Guide

• Press C to change from mode to mode.

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

World Time Mode

Timekeeping Mode

Press C

.

▲

▲

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

D

signal was last received) in the Timekeeping Mode.

PM
indicator

Day of week

Press .

▲

Month – Day

Hour : Minutes Seconds

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.

• Before using the watch in Western 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 in Western 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 A until the city

City code

code starts to flash, which indicates the setting screen.

2. Use (+) and BD
use as your Home City .

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

Western Europe time zones.

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

LON: London

3. Press C to display the summer time (DST) setting
screen.

4. Use to select AUTO (auto DST).

D

• Auto DST specifies auto switching between Daylight

Saving Time and Standard Time.

5. Press A twice to exit the setting screen.

Receive time

D

▲

Receive date

Last Signal Screen

(–) to select the city code you want to

Amsterdam, Hamburg,
Frankfurt, Vienna

About This Manual

(Light)

Module 2607

(Light)

Module 2637

• 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.

Time Recorder Mode

▲

Stopwatch Mode

▲

Alarm Mode

▲

6. Hold down for about two seconds until the watch

• Release and the message RC! appears to indicate

• Time calibration signal reception takes from two to six

Module 2607

Receiving indicator

Module 2637

• 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.

Resin
Band

• 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.

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.

Frankfurt

• This watch is able to receive the time calibration signal

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

D

beeps.

D

that signal reception has started.
minutes. Take care that you do not move the watch

during this time.

Metal Band

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.

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

— 4 —

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

Module 2607

Receiving indicator

Module 2637
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
best reception, be sure to keep the watch in a location where signal strength is strongest.

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

D

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.

D

D

D

[Module 2607]

[Module 2637]

Weak

(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 the Timekeeping or
World Time 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 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.

• 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 the Timekeeping 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 the Timekeeping 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 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 A to toggle auto receive on (

4.Press twice to exit the setting screen.

Strong

ON OFF

) and off (

).

Setting the Time 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 the Timekeeping Mode.

To set the current time and date manually

3. When the setting you want to change is flashing, use BD and/or to change it as
described below.

City code

DST

Auto Receive
12/24-Hour format

Hour, Minutes

Seconds
Year
Month, Day
Power Saving on/off

4. Press A to 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.

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.

12/24-Hour
Format

Power Saving
on/off

ScreenSetting

Press C .

/ Press A .

DSTCity Code

Seconds

Day

Auto

Receiv

e

Hour Minutes

Month Year

Button Operations

Use (+) and BD
setting.

Press to toggle between Daylight Saving

D

ON

Time (

• 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.

Press to toggle between 12-hour (12H)

D

and 24-hour (24H) timekeeping.
Use (+) and BD

setting.

Press to reset the seconds to 00.

D

Use (+) and B (–) to change the

D

setting.
Press to toggle the Power Saving on

(ON) and off (OFF).

(–) to change the

) and Standard Time (

D

D

(–) to change the

D

OFF

).

World Time

City code

Home city time

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 BD 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

DST indicator

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

Tabl e.”

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 b y pressing C .

1.In the World Time Mode, use BD and 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
displayed) and Standard Time (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 Standard Time. 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 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.

— 5 —

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

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 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.

In the Timekeeping Mode, hold down BD 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
through

#30

• Storing a new time record when there are already 30
records stored in memory automatically deletes record

#01

stores the new record as

.

, shifts the remaining records upwards by 1, and

#30

.

#01

Alarms

Alarm number

Home city time

Alarm time (Hour : Minutes)

To set an alarm time

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 the Timekeeping 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 (
indicator (

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

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

To test the alarm

• In the Alarm Mode, hold down BD to sound the alarm.

) are displayed in all modes.

SNZ

) that is currently turned on.

To select the alarm operation type

Alarm on indicator

Snooze on indicator

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
and

SNZ

. You can configure

AL1

only. Alarms
time alarms only.

• Alarm settings (and Hourly Time Signal settings) are
available in the Alarm Mode, which you enter by
pressing CD.

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 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 in the sequence shown

below to select other settings.

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

5.Press CD 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).

through

AL1 AL2 AL3

AL1

through

SNZ

as a snooze alarm

AL4

can be used as one-

MinutesHour

AL4

AL4SIG SNZ

), snooze on indicator (SNZ), and Hourly Time Signal on

AL1

through

AL4

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

AL1

through

AL4

, or

SNZ

Alarm/

Snooze on

) whose alarm

alarm (
type you want to select.

2.Press A to cycle through the available settings in the
sequence shown below.

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.

, or

,

— 6 —

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

SNZ

) that is currently turned on.

To turn the Hourly Time Signal on and off

Hourly time signal
on indicator

1.In the Alarm Mode, use to select the Hourly Time
Signal (SIG).

2.Press A to toggle it on (
displayed).

• The Hourly Time Signal on indicator (

display in all modes while this function is turned on.

AL1

through

AL4

displayed) and off ( not

) is shown on the

, or

Stopwatch

Minutes

Hours

Home city time

1/100 second

To measure times with the stopwatch

Elapsed Time

Start Stop

Split Time

D

Start Split

Two Finishes

D

Start Split

The stopwatch lets you measure elapsed time, split times,
and two finishes.

Seconds

• 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 .

DD

B

(SPL displayed)

B

First runner
finishes.
Display time of
first runner.

D

Re-start ClearStop

B

Split release

D

Stop

Second runner
finishes.

D

Stop

B

Split release

Display time of
second runner.

BD

B

Clear

B

Clear

Backlight

Auto light switch
on indicator

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
(

displayed) or off ( not displayed).

• The auto light switch on indicator (
light switch is turned on.

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.

Parallel to
ground

More than
40

°

) is on the display in all modes while the auto

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.

• This watch employs a solar cell that converts light into electricity that charges a built­in 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.

Level

Battery power indicator

Battery Power

Indicator

Module 2607 Module 2637

1

2

3

Charge Soon Alert

Recover indicator

• 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
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

Charge Times

Exposing the watch to light for the periods shown below each day restores the power
used by the above operating conditions.

4

) appears on the display and the following operations become

Exposure Level (Brightness) Approximate

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.

Solar cell

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.

Exposure Time

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)

• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.

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 ------------ ------------

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 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 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.

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.

Inside a

Inside or

among

buildings

• 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

• 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.

Time setting is
incorrect
following signal
reception.

vehicle

Near
household
appliances or
office
equipment

Near a
construction
site, airport, or
other sources
of electrical
noise

.

Probable Cause

•

The watch is not in the Timekeeping 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 the Timekeeping

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.

• 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.

• 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.

• Change the DST setting to
Auto DST.

• Select the correct Home City
Code.

— 7 —

▲

Near high­tension
power lines

What you should do

Among or
behind
mountains

▲

Auto Summer Time (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 Standard Time 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 .

To select the auto 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 CC and the summer time (DST) setting screen appears.

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

Auto DST(

AUTO

DST off(

OFF

) DST on(ON)

4. When the setting you want is selected, press A twice 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 Mean Time (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 “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 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.

Elapsed Time

in Dark

60 to 70 minutes

6 or 7 days

• Wearing 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.
on.

• Press any button.

• Angle the watch towards your face for reading.

To turn Power Saving on and off

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.

Display

Blank, with Sleep indicator (S )
flashing

Blank, with Sleep indicator (S
not flashing

It can take up to two seconds for the display to turn

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 CD seven times until the Power Saving on/off
screen appears.

4. Press to toggle Power Saving on (
(

OFF

).

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

All functions enabled, except
for the display

Beeper tone, backlight, display,

)

and auto receipt of the
calibration signal are disabled.

Operation

ON

) and off

More than 15
degrees too high

City Code Table

City

Code

– – –
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
TYO

SEL
ADL
SYD
NOU

WLG

• Based on data as of June 2002.

— 8 —

City

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

TOKYO
SEOUL

ADELAIDE

SYDNEY
NOUMEA

WELLINGTON

• 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.

GMT

Differential

–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

Other major cities in same time zone

PAGO PAGO
PAPEETE
NOME
SAN FRANCISCO, LAS VEGAS, 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
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

2-3. MODULE QW-2638

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...

Sleep indicator

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
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.

, if you press any button, or if you angle

*

General Guide

• Press C to change from mode to mode.

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

World Time Mode

Timekeeping Mode

Press C .

▲

▲

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

D

signal was last received) in the Timekeeping Mode.

PM
indicator

Day of week

Press .

▲

Month – Day

Hour : Minutes Seconds

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.

• 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

E/C/M/P indicator

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

City code

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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
DEN (M indicator) : Denver, El Paso

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

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

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3. Press CD 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 A twice to exit the setting screen.

D

▲

Last Signal Screen

Receive time

Receive date

Vegas, Seattle

New Orleans

About This Manual

(Light)

Module 2608

(Light)

Module 2638

• 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.

Time Recorder Mode

▲

Stopwatch Mode

▲

6. Hold down for about two seconds until the watch

• Release and the message RC! appears to indicate

• Time calibration signal reception takes from two to six

Module 2608

Receiving indicator

• Position the watch as shown in the nearby illustration,

Module 2638

Resin
Band

• 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.

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.

2,000 miles

600 miles

• This watch is able to receive the time calibration signal

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

Fort Collins

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.

• This watch automatically receives a time calibration

D

beeps.

D

that signal reception has started.
minutes. Take care that you do not move the watch

during this time.
and place it near a window in a location where there are

no nearby metal objects.

Metal Band

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.

kilometers) from the Fort Collins transmitter, the signal
may become weak and reception may be impossible
under certain conditions.

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

— 9 —

▲

Alarm Mode

To perform manual time calibration signal reception

Module 2608

Receiving indicator

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
best reception, be sure to keep the watch in a location where signal strength is strongest.

Weak

(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 the Timekeeping or
World Time 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 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.

• 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 ab le 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 the Timekeeping 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 the Timekeeping 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

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Setting the Time 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 the Timekeeping Mode .

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

D

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.

D

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.

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3.Press to toggle auto receive on (

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D

4.Press twice to exit the setting screen.

A

ON

D

Strong

) and off (

D

OFF

To set the current time and date manually

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3. When the setting you want to change is flashing, use BD
described below.

City code

DST

Auto Receive
12/24-Hour format

Hour, Minutes

Seconds
Year
Month, Day
Power Saving on/off

4. Press A to 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.

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

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shown below to select other settings.

Press

C

.

/ Press A .

DSTCity Code

12/24-Hour
Format

Power Saving
on/off

ScreenSetting

Seconds

Day

Button Operations

Use (+) and B (–) to change the

D

setting.
Press to toggle between Daylight Saving

D

Time (

) and Standard Time (

ON

• Pressing performs a different operation

D

when NYC, CHI, DEN, LAX, ANC or HNL
is selected as Home City Code. See “Auto
Summer Time (DST) Switching.”

Press to toggle auto receive on and off.

D

Press to toggle between 12-hour (12H)

D

and 24-hour (24H) timekeeping.
Use (+) and BD

setting.

Press to reset the seconds to 00.

D

Use (+) and BD
setting.

Press to toggle the Power Saving on

D

(ON) and off (OFF).

Auto

e

Receiv

utes

Hour

Min

Month Year

and/or to change it as

).

OFF

(–) to change the

(–) to change the

World Time

City code

Home city time

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 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

DST indicator

).

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
Tabl e .”

• 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 b y pressing C .

D

1.In the World Time Mode, use B and 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
displayed) and Standard Time (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 Standard Time. 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 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.

D

— 10 —

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

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 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.

In the Timekeeping Mode, hold down BD 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
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.

#01

Alarms

Alarm number

Home city time

Alarm time (Hour : Minutes)

To set an alarm time

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 the Timekeeping 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 (
indicator (

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

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

To test the alarm

• In the Alarm Mode, hold down BD to sound the alarm.

) are displayed in all modes.

SNZ) that is currently turned on.

To select the alarm operation type

Alarm on indicator

Snooze on indicator

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
and

SNZ. You can configure SNZ as a snooze alarm

AL1 through AL4 can be used as one-

only. Alarms
time alarms only.

• Alarm settings (and Hourly Time Signal settings) are
available in the Alarm Mode, which you enter by
pressing CD.

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

screens until the one whose time you want to set is
displayed.

AL1 AL2 AL3

SIG SNZ AL4

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 in the sequence shown

below to select other settings.

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

AL1 through AL4,

MinutesHour

), snooze on indicator (SNZ), and Hourly Time Signal on

AL1through AL4, or

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 A to cycle through the available settings in the

sequence shown below.

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.

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

AL1 through AL4, or SNZ) that is currently

turned on.

Alarm/

Snooze on

— 11 —

To turn the Hourly Time Signal on and off

Hourly time signal
on indicator

1.In the Alarm Mode, use to select the Hourly Time
Signal (SIG).

2.Press A to toggle it on (
displayed).

• The Hourly Time Signal on indicator (

display in all modes while this function is turned on.

displayed) and off ( not

) is shown on the

Stopwatch

Hours

Minutes

Home city time

1/100 second

To measure times with the stopwatch

Elapsed Time

Start Stop

Split Time

D

Start Split

Two Finishes

D

Start Split Stop Clear

Backlight

Auto light switch
on indicator

To turn on the backlight manuall

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
(

displayed) or off ( not displayed).

• The auto light switch on indicator (
light switch is turned on.

The stopwatch lets you measure elapsed time, split times,
and two finishes.

Seconds

• 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 .

DD

B

(SPL displayed)

B

First runner
finishes.
Display time of
first runner.

D

Re-start ClearStop

B

Split release

D

Second runner
finishes.

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.

Parallel to
ground

D

Stop

B

Split release

Display time of
second runner.

More than

°

40

) is on the display in all modes while the auto

BD

B

Clear

B

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.

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

Level

Battery Power

Indicator

Module 2608 Module 2638

1

2

3

Charge Soon Alert

Recover indicator

• 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
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

Charge Times

Exposing the watch to light for the periods shown below each day restores the power
used by the above operating conditions.

4

) appears on the display and the following operations become

Exposure Level (Brightness) Approximate

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.

Solar cell

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.

Exposure Time

— 12 —

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)

• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.

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 ------------ ------------

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 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 BD and 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.

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.

Inside or

among

buildings

• 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

• 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 within 15 seconds a month at normal temperature.

•

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.

Time setting is
incorrect
following signal
reception.

Inside a

vehicle

Near
household
appliances or
office
equipment

Near a
construction
site, airport, or
other sources
of electrical
noise

.

앧

Probable Cause

•

The watch is not in the Timekeeping Mode.

• You do not select one of the following
City Codes as your Home City Code:
NYC, CHI, DEN, or LAX.

• You changed the time setting manually.

• The watch was not in the Timekeeping

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.

• 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.

Near high­tension
power lines

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.

• Change the DST setting to
Auto DST.

• Select the correct Home City
Code.

Among or
behind
mountains

▲

Auto Summer Time (DST) Switching

The time calibration signal transmitted from Fort Collins, Colorado 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 Fort Collins 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 in the Continental United States, select Auto DST for the auto
summer time setting.

• The default summer time settings is Auto DST whenever you select one of the
following city codes as your Home City code: NYC, CHI, DEN, LAX, ANC, or HNL.

• If you experience problems receiving the time calibration signal in your area, it is
probably best to switch between Standard Time 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.

To select the auto 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 CD and the summer time (DST) setting screen appears.

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

Auto DST(

AUTO

)DST off(

OFF

) DST on(ON)

4. When the setting you want is selected, press A twice 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 Mean Time (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 “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 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.

Elapsed Time

in Dark

60 to 70 minutes

6 or 7 days

• Wearing 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.
on.

• Press any button.

• Angle the watch towards your face for reading.

To turn Power Saving on and off

l

l

l

l

l

l

l

l

l

l

l

l

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.

Display

Blank, with Sleep indicator (S )
flashing

Blank, with Sleep indicator (S
not flashing

It can take up to two seconds for the display to turn

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 CD seven times until the Power Saving on/off
screen appears.

4. Press to toggle Power Saving on (
(

OFF

).

5. After the setting is the wa y you want, press A to exit
the setting screen.

)

Operation

All functions enabled, except
for the display

Beeper tone, backlight, display,
and auto receipt of the
calibration signal are disabled.

ON

) and off

More than 15 degrees
too high

• 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.

City Code Table

City

– – –
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
TYO

SEL
ADL
SYD
NOU

City

HONOLULU

ANCHORAGE

LOS ANGELES

DENVER

CHICAGO

NEW YORK

CARACAS

RIO DE JANEIRO

LONDON

PAR IS

BERLIN

ATHENS

CAIRO

JERUSALEM

JEDDAH

TEHRAN

DUBAI

KABUL

KARACHI

DELHI

DHAKA

YAN GON

BANGKOK

HONG KONG

TOKYO
SEOUL

ADELAIDE

SYDNEY
NOUMEA

WELLINGTON

Code

WLG

• Based on data as of June 2002.

GMT

Differential

–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

Other major cities in same time zone

PAGO PAGO
PAPEETE
NOME
SAN FRANCISCO, LAS VEGAS, 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
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

— 13 —

3. DRAWINGS: MODULE QW-2609/2637/2638/2639
3-1. LCD DIAGRAM
MODULE QW-2609

L31

L32

L33

L34

L35

L39

L40

L41

LC2

LC3

LC1

L42

L45

L46

L47

L48

L51

L52

L53

L54

L55

LC4

LC5

SLEEP

SAVE

RECOVER

AM0

e5

PM1

PM0

AM1

f5

d5

DST1

g5

a5

c5

f9

g9

e9

d9

L30

L29

MID

b5

e4

a9

f8

b9

c9

e8a7c8 e7

d8

L28

L27

HIGH

LCHARGE

f4

d4

a8

b8 f7

g8

col1

L26

L25

x0

y4

y0

min

a4

b4

g4

c4

col0

h7

hyp

L24

L23

a6

b6

b7

f6

g6

g7

e6

c7

d7

c6

d6

PST

L22

L21

L20

L19

L18

a3

f2

f3

e3

MST

L17

b3

g3

c3

e2

d3

anta1

anta0

EST

CST

L16

L15

L14

L13

L12

L11

L10

x16

sec

a2

b2

g2

c2

d2

anta2

L9L8L7L6L5L4L3L2L1

SPL DST0

a1

g1

e1

d1

SIG

ALM

SNZ

AUTO EL

a0

b0

f0

b1

g0

c0

e0f1c1

d0

SEG.

COM.

LC1 LC2 LC3 LC4 LC5

L 1

SIG ALM SNZ

SPL

L 2

DST0

AUTO EL

L 3
L 4
L 5
L 6
L 7

d0

L 8

a6 e0 f0 d6 g6

L 9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19

f6 c1 b1 e6
d1 g1 a1 c7 b7
a7 e1 f1 d7 g7
h7 c2 sec e7 f7
d2 g2 b2 hyp col1
e2 f2 a2 c8 b8
a8 c3 b3 d8 g8
d3 g3 a3 e8 f8
b9 e3 f3 c9
a9 col0 min d9 g9

L20

d4 g4 a4 AM1 PM1

L21
L22

DST1 e4 f4

L23

d5 g5 a5

L24
L25
L26
L27

RECOVER

AM0 PM0

SAVE

b0c0

g0 a0 c6

c4 b4 e9 f9

c5 b5

e5 f5

EST
CST
MST

anta0
anta1
anta2PST

b6

SEG.

COM.

LC1 LC2 LC3 LC4 LC5

L31

HIGH MID

x0y2 x0y1 x0y0 x0y4 x0y3

L32

x1y2 x1y1 x1y0 x1y4 x1y3

L33

x2y2 x2y1 x2y0 x2y4 x2y3

L34

x3y2 x3y1 x3y0 x3y4 x3y3

L35
L36
L37
L38

x4y2 x4y1 x4y0 x4y4 x4y3

L39

x5y2 x5y1 x5y0 x5y4 x5y3

L40

x6y2 x6y1 x6y0 x6y4 x6y3

L41
L42
L43
L44
L45

x8y2 x8y1 x8y0 x8y4 x8y3
x9y2 x9y1 x9y0 x9y4 x9y3

L46

x10y2 x10y1 x10y0 x10y4 x10y3

L47
L48

x11y2 x11y1 x11y0 x11y4 x11y3

L49
L50

x12y2 x12y1 x12y0 x12y4 x12y3

L51
L52

x13y2 x13y1 x13y0 x13y4 x13y3
x14y2 x14y1 x14y0 x14y4 x14y3

L53

x15y2 x15y1 x15y0 x15y4 x15y3

L54
L55

x16y2 x16y1 x16y0 x16y4 x16y3

L28
L29

L30

x7y3x7y2 x7y1 x7y0 x7y4

SLEEP

LCHARGE

— 14 —

MODULE QW-2637/2638/2639

SLEEP

SAVE

PM0

AM0

f5

e5

d5

RECOVER

g5

AM1

LC1

a5

c5

DST1

PM1

LC2

LC3

HIGH

MID

LCHARGE

b5

LC4

L31

L32

L33

L34

L35

L39

L40

L41

L42

L45

L46

L47

L48

L51

L52

L53

x0

y4

L54

x16

LC5

L55

SIG

ALM

y0

sec

a4

f4

b4

g4

e4

c4

d4

a9

f9

g9

e9

d9

col0

a8

b9

f8

b8

g8

e8

c9

c8

col1

d8

min

e3

hyp

a3

f3

b3

g3

c3

d3

h7

a7

a6

f6

b7

f7

g7

e7

d7

g6

e6

c7

c6

d6

a2

f2

g2

e2

c2

d2

b6

MSTPST

CST

b2

EST

SPL

a1

f1

g1

e1

c1

d1

anta0

b1

e0

anta1

f0

d0

anta2

SNZ

AUTO EL

DST0

a0

b0

g0

c0

SEG.

L 1
L 2
L 3
L 4
L 5
L 6
L 7
L 8

L 9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
L31

COM.

LC1
SIG

DST0

d0
a6

f6
d1
a7
h7
d2
e2
a8
d3
b9
a9

d4

DST1

d5

RECOVER

HIGH

LC2

ALM

SPL

c0
g0
e0

c1
g1
e1

c2
g2

f2

c3
g3
e3

col0

c4
g4
e4

c5
g5
e5

AM0

SAVE

MID

L28

L30

L29

LC3
SNZ

AUTO EL

sec

min

PM0

L27

L26

L25

L24

L23

L22

L21

L20

L19

L18

L17

L16

L15

L14

L13

LC4

LC5

SEG.

L32
L33

EST
CST
MST

PST

anta0
anta1

anta2
b0
a0

f0
b1
a1

f1

b2
a2
b3
a3

f3

b4
a4

c6
d6

c7
d7
e7

hyp

c8
d8
e8

d9
e9

AM1

b6
g6
e6
b7
g7

f7

col1

b8
g8

f8
c9
g9

f9

PM1

f4
b5
a5

L34
L35
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L46
L47
L48
L49
L50
L51
L52
L53
L54
L55

f5

SEG.

L28
L29

L9L8L7L6L5L4L3L2L1

L12

L11

L10

COM.

LC1
x0y2
x1y2
x2y2
x3y2

x4y2
x5y2
x6y2
x7y2

x8y2
x9y2

x10y2

x11y2

x12y2
x13y2
x14y2
x15y2
x16y2

COM.

SLEEP

LCHARGE

L30

LC2
x0y1
x1y1
x2y1
x3y1

x4y1
x5y1
x6y1
x7y1

x8y1
x9y1

x10y1
x11y1

x12y1
x13y1
x14y1
x15y1
x16y1

LC3
x0y0
x1y0
x2y0
x3y0

x4y0
x5y0
x6y0
x7y0

x8y0

x9y0
x10y0
x11y0

x12y0
x13y0
x14y0
x15y0
x16y0

LC4
x0y4
x1y4
x2y4
x3y4

x4y4
x5y4
x6y4
x7y4

x8y4
x9y4

x10y4
x11y4

x12y4
x13y4
x14y4
x15y4
x16y4

LC5
x0y3
x1y3
x2y3
x3y3

x4y3
x5y3
x6y3
x7y3

x8y3
x9y3

x10y3
x11y3

x12y3
x13y3
x14y3
x15y3
x16y3

— 15 —

3-2. CIRCUIT DIAGRAM

MODULE QW2609/2639

Rs

Rd

FET

✽12

Rant3

Cc

Rant1

Rant2

16

REG

IN1

1

Creg

15

IN2 PON
2

14

AGC

VCC
3

Cagc

13

FIL1

IC

OUT1
4

Cf13

12

FIL2

OUT2
5

Cf12

Cxt

11

TCO

GND
6

Rpd

10

HOLD

REC
7

9

DEC2

DEC1
8

Rcp

Ccp9

RP1RP2

SCR

SCIN

CSB

✽1

✽1 ✽1

SDO SCK

✽1

SDI

LC1 - - - LC5

Crl2

Crh3

Crh1

Crl3

Crl1

Crh2

ANT

Cp

VPM

✽1

LSI

BONDING 101PINS

TOTAL 106PINS

Rxt3

Rxt2

KC4

KC2

✽10

Xtal3

Xtal2

Cbat

Rbat

✽2

✽2

KC3

KC1

✽11

VDD1

VDSP

VCH VDD3 VC1 VC2

VHF

VC3 VC4

BD

C3

C2

C1

C4

C5

C6

C7

LL1

Tr1

R1

Di2

PZ
Z

(N trimming)

✽ 6. Short (Soldering)

✽ 7. GNDB is used for the bias on the back of the tip.

✽ 8. L28~L30 are used as static drive terminals.

✽ 9. Normal Low

✽ 10. LD2 (Normal Low) is used in this module.

✽ 11. KC3 is used in this module.

✽ 12. Rant1 are not used in this module.

(R trimming)

✽ 1. No bonding

✽ 2. GND-KI7: Open (No Soldering)

KC1-KI6: Open (No Soldering)

KC3-KI6: Open (No Soldering)

✽ 3. Latch type key

✽ 4. Short (Soldering)

✽ 5. Inclination sensor

✽8

LCD ( 2.8V 1/3b 1/5d )

L1 - - - - L55

T1T2T3

AC

T4

KI1

KI2

KI3

KI4

S2

S1

S4

S3

SA

Rb

EL

BACK

NCNCNC

VCC

ENB

✽7

GNDB

FRONT

INV

GND

ELD

RT1

LL2

CIL

RT2

Rel

BAT

GND VDD2

C8

Di1

SC

✽9

✽3✽3✽3

✽3

✽3

✽3

N1

KI5

KI9

KI6

KI7

KI8

SK

✽2

✽5

✽6✽6✽4✽4✽4

KS

✽3

R1

R2

R3

N2

XTB

Xtal

VSC

XT

LD1

C9

CT

— 16 —

MODULE QW2637

✽12

✽12

Rs

Rd

✽12

FET

Cc

RP1RP2

Rant3

✽12

Crl2

Crh3

Crh1

Cp

Crl3

Crl1

Crh2

Rant1

✽12

ANT

Rcp

12

FIL2

OUT2

5

Cf12

Rxt3

Rxt2

Rpd

Ccp9

Xtal3

Xtal2

✽12

✽2

10

HOLD

REC

7

9

DEC2

DEC1

8

Cbat

Rbat

✽2

(N trimming)

✽ 6. Short (Soldering)

✽ 7. GNDB is used for the bias on the back of the tip.

✽ 8. L28~L30 are used as static drive terminals.

✽ 9. Normal Low

✽ 10. LD2 (Normal Low) is used in this module.

✽ 11. KC3 is used in this module.

✽ 12. Rant1, FET, Rs, Rd, Crl2, Crl3, Rxt3 and Xtal3

are not used in this module.

11

TCO

GND

6

Cxt

Creg

16

15

REG

✽12

IN1

Rant2

IN2 PON

1

2

14

AGC

VCC

3

Cagc

13

FIL1

IC

OUT1

4

Cf13

✽12

SCR

SCIN

CSB

✽1

✽1 ✽1

SDO SCK

✽1

SDI

LC1 - - - LC5

✽8

LCD ( 2.8V 1/3b 1/5d )

L1 - - - - L55

T1T2T3

AC

T4

KC4

KC3

KC2

VPM

✽1

LSI

TOTAL 106PINS

BONDING 101PINS

✽3

✽3

KI1

KI2

KI3

KI4

KI5

KI6

KI7

SA

S2

S1

S4

S3

✽2

KI8

SK

KI9

✽5

KS

✽3✽3✽3

N1

✽6✽6✽4✽4✽4

✽3

✽3

R1

R2

R3

N2

✽10

XTB

Xtal

KC1

✽11

XT

CT

✽9

LD1

VDD1

VDSP

VCH VDD3 VC1 VC2

VHF

VC3 VC4

BD

GND VDD2

VSC

C3

C2

C1

C4

C5

C6

C7

LL1

Tr1

R1

Di2

Di1

PZ

Z

BAT

C8

✽ 1. No bonding

✽ 2. GND-KI7: Open (No Soldering)

KC1-KI6: Short (Soldering)

EL

BACK

FRONT

NCNCNC

ELD

INV

SC

C9

VCC

ENB

GND

RT1

✽7

GNDB

Rb

(R trimming)

KC3-KI6: Open (No Soldering)

✽ 3. Latch type key

✽ 4. Short (Soldering)

LL2

CIL

RT2

Rel

✽ 5. Inclination sensor

— 17 —

MODULE QW2638

✽12

✽12

Rs

Rd

✽12

FET

Cc

Rant3

✽12

Crl3

✽12

Crl2

Crl1

Crh3

Crh2

Crh1

ANT

Cp

RP1RP2

✽12

Rant1

Rant2

16

REG

IN1
1

Creg

Rcp

Rpd

13

FIL1

Cf13

12

FIL2

Cf12

11

TCO

10

HOLD

9

DEC2

Ccp9

Cagc

15

14

AGC

IC

IN2 PON

VCC

2

3

OUT1
4

OUT2
5

✽12

Rxt3

Rxt2

REC

GND
6

Cxt

Xtal3

Xtal2

DEC1

7

8

✽12

Cbat

(N trimming)

Rbat

✽2

✽2

✽ 6. Short (Soldering)

✽ 7. GNDB is used for the bias on the back of the tip.

✽ 8. L28~L30 are used as static drive terminals.

✽ 9. Normal Low

✽ 10. LD2 (Normal Low) is used in this module.

✽ 11. KC3 is used in this module.

✽ 12. Rant1, FET, Rs, Rd, Crl2, Crl3, Rxt3 and Xtal3

are not used in this module.

SCR

SCIN

CSB

✽1

✽1 ✽1

SDO SCK

✽1

SDI

LC1 - - - LC5

✽8

LCD ( 2.8V 1/3b 1/5d )

L1 - - - - L55

T1T2T3

AC

KC4

KC3

KC2

✽10

XTB

Xtal

KC1

✽11

XT

CT

✽9

LD1

VDD1

VDSP

VCH VDD3 VC1 VC2

VHF

VC3 VC4

BD

GND VDD2

VSC

C3

C2

C1

C4

C5

C6

C7

LL1

Tr1

R1

Di2

Di1

PZ
Z

BAT

C8

✽ 1. No bonding

✽ 2. GND-KI7: Short (Soldering)

KC1-KI6: Open (No Soldering)

EL

BACK

FRONT

NCNCNC

INV

SC

C9

VCC

ENB

GND

✽7

GNDB

Rb

(R trimming)

KC3-KI6: Open (No Soldering)

✽ 3. Latch type key

✽ 4. Short (Soldering)

✽ 5. Inclination sensor

LL2

CIL

ELD

RT1

RT2

Rel

VPM

✽1

LSI

TOTAL 106PINS

BONDING 101PINS

✽3

✽3

T4

KI1

KI2

KI3

KI4

KI5

KI6

KI7

S2

S1

S4

S3

SA

✽2

KI8

SK

KI9

✽5

KS

✽3✽3✽3

N1

✽6✽6✽4✽4✽4

✽3

✽3

R1

R2

R3

N2

— 18 —

3-3. CHECKING TERMINALS AND COMPONENTS

Resistor/Chip

Capacitor/Chip

Creg

Resistor/Chip

Rp2

Rant2

16

KI1

KI4

16

2

GND

GND

GND

R3

D

R2

GND

GND

R1

SCINSCR

SCINGND

SCINGND

GND

VSC

GND N2

GND

ELD

VSC

Capacitor/ChipC9

Resistor/Chip

Rp1

SD

2

S

D

KC2

D

3.PCB ASS'Y

N1GND

GNDB

VDD2

Di2

Resistor/ChipRb

Resistor/Chip

Capacitor/ChipCp

S

GND

QW2609/2639

(7640 5852)

QW2637

(7640 5966)

QW2638

(7640 5962)

GND VSC

Diode

Rxt2

C7

Capacitor/Chip

C4

Capacitor/
Chip

C6

Capacitor/
Chip

C5

Capacitor/
Chip

Xtal3 4

Xtal2 4

GND

GNDKI8

KI7

GND

KI6 KC1

KC3

KI6

VC1

VC3

VDSP

VC2

VHF

VDD3

VDD1

VDD2

R1

Resistor/Chip

VC4

GND

GND

GND

GND

Di2

KI5

KI3

Diode

4. Capacitor/Trimmer
(1001 0950)

Tr1

6. Sensor/Tilt (7105 5275)

Transistor

12. Cushion/6 (7211 0064)

5. Oscillator/Crystal (7110 6323)

Xtal2

Resistor/Chip

Rcp

Ccp9

Capacitor/Chip
Cxt

KI5

KI8

T

X

VDD2

VDD2 R1

XT XTB

BD

R1

LL1

Xtal3

AC

BD

R1

GND

LL1

L

L

1

VCH

VCH

GND

D

N

G

KI3

Xtal27

7

VC1

GND

VDSP

GND

LL1

G

N

D

Capacitor/Chip

Cagc

Capacitor/Chip

Capacitor/Chip

Cbat

Rbat

5

7

GND5432

S12

GND

VDD2

KI2

8

7

9

3

9

KI9

GND

R6

13

KI9

R6

KI9

GND12GND

GND

GND

KC2

GND

RT1

RT2

VDD2

INV

C8

Capacitor/
Chip

Resistor/Chip

Rel

11. Cushion/506
(7211 9631)

Resistor/
Chip

1

121314

16

KC4

KC4

14

3

14

GND

VDD2

VSC

LD1

GND

RT2

RT1

LD1

CIL

ELD

GND

ELD

CIL

Inverter

IC

KI1

1

16

3

KI1

VDD2

VDD2

KI4

GND

GND

C2

Capacitor/Chip

C1

Capacitor/Chip

C3

Capacitor/Chip

Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y

Z

— 19 —

Coil

LL1

Varistor

Coil

LL2

Capacitor/Chip

Cf13

Capacitor/Chip

Cf12

Resistor/Chip

Rpd

11. Cushion/506 (7211 9631)

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

18a (1009 3601)
18b (1009 7019)

19 (7230 0805)

QW2609 1a (1009 2583)
1b (1009 6265)
1c (1009 6263)
QW2637/2638 1a (1009 8048)
1b (1009 8049)
QW2639 1 (1009 8048)

2 (1009 3603)

22 (1005 8521)

21 (1009 3602)

15 (1009 3600)

20 (7230 1028)
9 (1008 3365)

15 (1009 3600)

QW2609/2639 3 (7640 5852)
QW2637 3 (7640 5966)
QW2638 3 (7640 5962)

PCB ass'y

QW2609/2639 7 (7640 6009)
QW2637 7 (7640 6026)
QW2638 7 (7640 6025)

13 (7231 1777)
17 (7207 8852)

14 (1008 3364)

10 (1010 5010)
8 (1006 5657)

Battery Storage (CTL1616)

16 (1006 5664)

— 20 —

5. PARTS LIST: MODULE QW-2609

-

p

Note: 1. Prices and specifications are subject to change without prior notice.

2. Spare parts are classified as follows according to their importance in after-sales service.
A Rank ---------------------------------------- Very Important
B Rank ---------------------------------------- Important
C Rank ---------------------------------------

3. Batteries in Bulk pack on the tray will be supplied from our Overseas Spare Parts Section under charge basis.

Batteries in Blister pack will be supplied from our Sales Department.

4. As for order/supply of spare parts, refer to the separate publication "GUIDE BOOK for spare parts supply".

Item Code No. Parts Name Specification Applicable Q R

Less important

1009 6122 MODULE/WITH MOVEMENT QW-2609YCSA-01
1009 6124 MODULE/WITH MOVEMENT QW-2609YCSA-02
1009 6126 MODULE/WITH MOVEMENT QW-2609YCSA-03

1009 2583 LCD C2608-02P

1a

1009 6265 LCD C2608-05P

1b

1009 6263 LCD C2608-03P

1c

1009 3603 EL YEL-2608-A-00

2

7640 5852 PCB ASS'Y Q255861*1TK

3

1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P

4

7110 6323 OSCILLATOR/CRYSTAL DT-26S11

5

7105 5275 SENSOR/TILT TS-2418-P

6

7640 6009 ANTENNA ASS'Y Q372271*1TK

7

1006 5657 BATTERY/STORAGE CTL1616

8

1008 3365 CONTACT/BATTERY(-) 1673 Q358740A-2

9

1010 5010 CUSHION Q471029-1

10

7211 9631 CUSHION/506 Q49364-1

11

7211 0064 CUSHION/6 Q4914A-1

12

7231 1777 HOLDER 1381 Q456843-1

13

1008 3364 HOLDER/BATTERY Q254197A-2

14

1009 3600 INTERCONNECTOR 2608 Q470297-1

15

1006 5664 LABEL 2368 Q468543A-1

16

7207 8852 SCREW/FLAT 737 Q430508A-1

17

1009 3601 SPACER 2608 Q470438-1

18a

1009 7019 REFLECTOR/SEMI TRANSPARENT DR2-2609-G2

18b

7230 0805 SPRING/COIL 1405-1 Q453652-1

19

7230 1028 SPRING/COIL 1555-1 Q460154-1

20

1009 3602 SPRING/COIL 2608 Q470488-1

21

1005 8521 CUSHION Q468515-1

22

GW-300J-1,GW-300MJ-8J
GW-300J-9J
GW-300VJ-8J

QW-2609YCSA-01
QW-2609YCSA-02
QW-2609YCSA-03
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common 1
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA Common
QW-2609YCSA-01/03 1 C
QW-2609YCSA-02
QW-2609YCSA Common 2 B
QW-2609YCSA Common
QW-2609YCSA Common

QW-2609YCSA Common

1A
1A
1A

1A
1A
1A
1A

1A

B

1B
1B
1B
1B
1C
2C
2C

1 C

1C
1C
2C
1C
1C

1C
1B

3B

1C

For the

Notes: Q - Used quantity

rices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-592.

R - Rank

— 21 —

MODULE QW-2637

-

p

Note: 1. Prices and specifications are subject to change without prior notice.

2. Spare parts are classified as follows according to their importance in after-sales service.
A Rank ---------------------------------------- Very Important
B Rank ---------------------------------------- Important
C Rank ---------------------------------------

3. Batteries in Bulk pack on the tray will be supplied from our Overseas Spare Parts Section under charge basis.

Batteries in Blister pack will be supplied from our Sales Department.

4. As for order/supply of spare parts, refer to the separate publication "GUIDE BOOK for spare parts supply".

Item Code No. Parts Name Specification Applicable Q R

Less important

1010 2201
1010 2203

1009 8048 LCD C2639-01P

1a

1009 8049 LCD C2639-02P

1b

1009 3603 EL YEL-2608-A-00

2

7640 5966 PCB ASS'Y Q255908*1ATTK

3

1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P

4

7110 6323 OSCILLATOR/CRYSTAL DT-26S11

5

7105 5275 SENSOR/TILT TS-2418-P

6

7640 6026 ANTENNA ASS'Y Q372420*1ATTK

7

1006 5657 BATTERY/STORAGE CTL1616

8

1008 3365 CONTACT/BATTERY(-) 1673 Q358740A-2

9

1010 5010 CUSHION Q471029-1

10

7211 9631 CUSHION/506 Q49364-1

11

7211 0064 CUSHION/6 Q4914A-1

12

7231 1777 HOLDER 1381 Q456843-1

13

1008 3364 HOLDER/BATTERY Q254197A-2

14

1009 3600 INTERCONNECTOR 2608 Q470297-1

15

1006 5664 LABEL 2368 Q468543A-1

16

7207 8852 SCREW/FLAT 737 Q430508A-1

17

1009 3601 SPACER 2608 Q470438-1

18a

1009 7019 REFLECTOR/SEMI TRANSPARENT DR2-2609-G2

18b

7230 0805 SPRING/COIL 1405-1 Q453652-1

19

7230 1028 SPRING/COIL 1555-1 Q460154-1

20

1009 3602 SPRING/COIL 2608 Q470488-1

21

1005 8521 CUSHION Q468515-1

22

MODULE/WITHOUT MOVEMENT
MODULE/WITHOUT MOVEMENT

QW-2637ATSA-01 MTG-900D-2V/8V 1 A
QW-2637ATSA-02 MTG-900D-9V 1A

QW-2637ATSA-01
QW-2637ATSA-02
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA-01
QW-2637ATSA-02
QW-2637ATSA Common
QW-2637ATSA Common
QW-2637ATSA Common

QW-2637ATSA Common

1A
1A
1A
1A
1B
1B
1B
1B
1B
1C
2C
2C

1 C

1C
1C
2C
1C
1

C
1C
1

C
2

B
1

B
3

B

1C

For the

Notes: Q - Used quantity

rices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-592.

R - Rank

— 22 —

MODULE QW-2638

-

p

Note: 1. Prices and specifications are subject to change without prior notice.

2. Spare parts are classified as follows according to their importance in after-sales service.
A Rank ---------------------------------------- Very Important
B Rank ---------------------------------------- Important
C Rank ---------------------------------------

3. Batteries in Bulk pack on the tray will be supplied from our Overseas Spare Parts Section under charge basis.

Batteries in Blister pack will be supplied from our Sales Department.

4. As for order/supply of spare parts, refer to the separate publication "GUIDE BOOK for spare parts supply".

Item Code No. Parts Name Specification Applicable Q R

Less important

1010 2207
1010 2209

1009 8048 LCD C2639-01P

1a

1009 8049 LCD C2639-02P

1b

1009 3603 EL YEL-2608-A-00

2

7640 5962 PCB ASS'Y Q255809*1ATTK

3

1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P

4

7110 6323 OSCILLATOR/CRYSTAL DT-26S11

5

7105 5275 SENSOR/TILT TS-2418-P

6

7640 6025 ANTENNA ASS'Y Q372115*1ATTK

7

1006 5657 BATTERY/STORAGE CTL1616

8

1008 3365 CONTACT/BATTERY(-) 1673 Q358740A-2

9

1010 5010 CUSHION Q471029-1

10

7211 9631 CUSHION/506 Q49364-1

11

7211 0064 CUSHION/6 Q4914A-1

12

7231 1777 HOLDER 1381 Q456843-1

13

1008 3364 HOLDER/BATTERY Q254197A-2

14

1009 3600 INTERCONNECTOR 2608 Q470297-1

15

1006 5664 LABEL 2368 Q468543A-1

16

7207 8852 SCREW/FLAT 737 Q430508A-1

17

1009 3601 SPACER 2608 Q470438-1

18a

1009 7019 REFLECTOR/SEMI TRANSPARENT DR2-2609-G2

18b

7230 0805 SPRING/COIL 1405-1 Q453652-1

19

7230 1028 SPRING/COIL 1555-1 Q460154-1

20

1009 3602 SPRING/COIL 2608 Q470488-1

21

1005 8521 CUSHION Q468515-1

22

MODULE/WITHOUT MOVEMENT
MODULE/WITHOUT MOVEMENT

QW-2638ATSA-01 MTG-900DA-2V/8V 1 A
QW-2638ATSA-02 MTG-900DA-9V 1 A

QW-2638ATSA-01
QW-2638ATSA-02
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2637ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA-01
QW-2638ATSA-02
QW-2638ATSA Common
QW-2638ATSA Common
QW-2638ATSA Common

QW-2638ATSA Common

1A
1A
1A
1A
1B
1B
1B
1B
1B
1C
2C
2C

1 C

1C
1C
2C
1C
1C
1

C
1C
2

B
1

B
3

B

1C

For the

Notes: Q - Used quantity

rices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-592.

R - Rank

— 23 —

MODULE QW-2639

-

p

Note: 1. Prices and specifications are subject to change without prior notice.

2. Spare parts are classified as follows according to their importance in after-sales service.
A Rank ---------------------------------------- Very Important
B Rank ---------------------------------------- Important
C Rank ---------------------------------------

3. Batteries in Bulk pack on the tray will be supplied from our Overseas Spare Parts Section under charge basis.

Batteries in Blister pack will be supplied from our Sales Department.

4. As for order/supply of spare parts, refer to the separate publication "GUIDE BOOK for spare parts supply".

Item Code No. Parts Name Specification Applicable Q R

Less important

1009 8879
1009 8048 LCD C2639-01P

1

1009 3603 EL YEL-2608-A-00

2

7640 5852 PCB ASS'Y Q255861*1TK

3

1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P

4

7110 6323 OSCILLATOR/CRYSTAL DT-26S11

5

7105 5275 SENSOR/TILT TS-2418-P

6

7640 6009 ANTENNA ASS'Y Q372271*1TK

7

1006 5657 BATTERY/STORAGE CTL1616

8

1008 3365 CONTACT/BATTERY(-) 1673 Q358740A-2

9

1010 5010 CUSHION Q471029-1

10

7211 9631 CUSHION/506 Q49364-1

11

7211 0064 CUSHION/6 Q4914A-1

12

7231 1777 HOLDER 1381 Q456843-1

13

1008 3364 HOLDER/BATTERY Q254197A-2

14

1009 3600 INTERCONNECTOR 2608 Q470297-1

15

1006 5664 LABEL 2368 Q468543A-1

16

7207 8852 SCREW/FLAT 737 Q430508A-1

17

1009 3601 SPACER 2608 Q470438-1

18

7230 0805 SPRING/COIL 1405-1 Q453652-1

19

7230 1028 SPRING/COIL 1555-1 Q460154-1

20

1009 3602 SPRING/COIL 2608 Q470488-1

21

1005 8521 CUSHION Q468515-1

22

For the

MODULE/WITHOUT MOVEMENT

rices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-592.

QW-2639YCSA-01 MTG-900DJ-2J/4AJ/8J 1 A

QW-2639YCSA-01
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA-01
QW-2639YCSA Common
QW-2639YCSA Common
QW-2639YCSA Common

QW-2639YCSA Common

1A
1A
1A
1B
1B
1B
1B
1B
1C
2C
2C

1 C

1C
1C
2C
1C
1C
1C
2

B

1

B
3B

1C

Notes: Q - Used quantity

R - Rank

— 24 —

6. PRECAUTIONS FOR REPAIR: MODULE QW-2609/2637/2638/2639
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE

1. Perform AC (ALL CLEAR) when inserting a new battery, or else the memories and/ or counters may give

erratic displays.
Touch the AC contact and the main plate with the metallic tweezers.
The contact should be made for about two seconds.

2. On removing of the module from the case, please insert the precision screw driver between the module

and the case pointed by arrows.

Metallic tweezers

6-2. ACCURACY CHECKING

Check the accuracy of the module with the quartz timer after switching the module to “ACCURACY
CHECKING MODE”.

The operations are shown below:
A) SWITCHING TO “ACCURACY CHECKING MODE”

While pressing the D button, press A and C buttons at the normal timekeeping mode.
Then all the segments are displayed and the LCD drive signals are changed to the static drive signal
of “32 Hz” so that you can check the accuracy with the quartz timer.

B) CANCELLATION OF THE “ACCURACY CHECKING MODE”

Press any button, except for D button.
Then the display is returned to its original state.

NOTE: The “ACCURACY CHECKING MODE” will

automatically return to the regular mode
in 1 ~ 2 hour(s) without any operation.

QW-2609/2639 QW-2637/2638

— 25 —

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

Check a Solar cell and PCB ass'y are contacted correctly by contact spring, when a module is
disassembled.

1. To enter TEST mode.

1) While pressing D button, press A and B buttons at the normal timekeeping mode.

2. Check a Solar cell and PCB ass'y contact in the following order.

1) Display side up and place the watch on the desk.

2) Check the display indicates as figure 2.

3) Display side down and place the watch on the desk more than two seconds.
Or go to a dark room and place the watch more than two seconds.

4) Check the display indicates as figure 3.
If "8888" is not appeared on the display, disassemble again the module and check the contact
spring between the Solar cell and PCB.

A

C

CHARGE

P

E

B

Press D, A and B buttons

DST

D

Figure 1

Appear "8888" on display.

3. To exit from TEST mode
Press any button.

6-4. HOW TO CHECK TILT SENSOR

1) Press A, B and C buttons at the normal timekeeping mode.

2) Check the display indicates as figure 4.

3) Tilt the watch towards you more than 40 degrees.

4) Check the display indicates as figure 5.

Figure 2

Place the watch in a dark
room more than two seconds.

Figure 3

Figure 4 Figure 5

Appear "TLT" on display.

Tilt the watch towards you
more than 40°

— 26 —

Appear "8888" on display.

More than 40°

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

This is a flow chart about signal reception.

START

Check whether the Home City

code is selected correctly.

To perform MANUAL time

calibration signal reception.

Signal

reception OK?

No

To perform AUTO time

calibration signal reception.

Signal

reception OK?

No

Replace the PCB ass'y

Signal

reception OK?

Yes

OK

Yes

OK

Yes

OK

Check your location, refer to the operation manual.

No

Replace theantenna ass'y

Yes

Signal

reception OK?

No

There is a possibility of location bad.

— 27 —

OK

Ver. 1 : Correction of page 22
Ver. 2 : Correction of page 20, 21, 22, 23, and 24

CASIO TECHNO CO.,LTD.

Overseas Service Division

Shibuya-ku, Tokyo 151-8543, Japan

6-2, Hon-machi 1-Chome