Casio QW-2957 Troubleshooting guide

SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-2957
MODULE NO.
R
REF. NO. S/M-906
AUG. 2005
G-7600
Ver.1 : Sep. 2005

CONTENTS
Page
1. SPECIFICATIONS ......................................................................................... 1
2. OPERATION CHART: MODULE QW-2957 .................................................. 2
3. DRAWINGS: MODULE QW-2957
3-1. LCD DIAGRAM ..................................................................................................6
3-2. CIRCUIT DIAGRAM ...........................................................................................7
3-3. CHECKING TERMINALS AND COMPONENT .................................................8
4. EXPLODED VIEW: MODULE QW-2957 ....................................................... 9
5. PARTS LIST: MODULE QW-2957 .............................................................. 10
6. PRECAUTIONS FOR REPAIR: MODULE QW-2957
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE ........................................ 11
6-2. ACCURACY CHECKING ................................................................................ 11

— 1 —
1. SPECIFICATIONS: MODULE QW-2957
Battery CR2016
Battery life Approx. 5 years
Current consumption 1.4 µA maximum
Alarm system Piezo plate on Back cover
Accuracy ±15 sec./month
Accuracy setting system Chip capacitor selection
Accuracy checking See page 11
Functions: • Shock resistant (G-SHOCK)
• Electro-luminescent backlight
Auto light switch, afterglow
• e-DATA MEMORY
Memory capacity: Up to 40 records for Internet access codes and other
data (when there are 7 characters per record), actual number of records
depends on the number of characters per record.
Other: Password
• World time
29 time zones (27 cities), city code display, daylight saving on/off
• 1/100-sec. stopwatch
Measuring capacity: 23:59'59.99"
Measuring modes: Elapsed time, split time, 1st-2nd place times
• Countdown timer
Input range: 1 min. to 24 hr.
Unit: 1 sec.
Other : Auto-repeat
• Multi alarms
5 independent multi alarms (4 one-time alarms and 1 snooze alarm)
Other: Schedule text (8 characters)
• Hourly time signal
• Auto-calendar (to year 2039)
• 12/24-hour format
• Regular timekeeping: Hr, min, sec, am/pm, month, date, day
Item Detail

— 2 —
2. OPERATION CHART: MODULE QW-2957
About This Manual
•Depending on the model of your watch, display text
appears either as dark figures on a light background or
light figures on a dark background. All sample displays
in this manual are shown using dark figures on a light
background.
•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.
(Light)
Timekeeping Mode World Time Modee-DATA MEMORY Mode Stopwatch ModeCountdown Timer ModeAlarm Mode
Press .
General Guide
•Press Cto change from mode to mode.
•In any mode, press Lto illuminate the display.
Hour : Minutes Seconds
PM indicator
Day of week
Month – Day
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date.
Read This Before You Set the Time and Date !
The times displayed in the Timekeeping Mode and World
Time Mode are linked. Because of this, make sure you
select a city code for your Home City (the city where you
normally use the watch) before you set the time and date.
City code
To set the time and date
1.In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2.Press Cto move the flashing in the sequence shown
below to select other settings.
Minutes
12/24-Hour
Format
Seconds City Code Hour
YearDay
DST
Month
3. When the setting you want to change is flashing, use Dand Bto change it as
described below.
Screen
50
OFF
TYO
P10:58
12H
2005
6-30
To do this:
Reset the seconds to
00
Toggle between Daylight Saving Time (
ON
)
and Standard Time (
OFF
)
Change the city code
Change the hour or minutes
Toggle between 12-hour (
12H
) and 24-
hour (
24H
) timekeeping
Change the year
Change the month or day
Do this:
Press D.
Press D.
Use D(east) and B(west).
Use D(+) and B(–).
Press D.
Use D(+) and B(–).
• For full information on city codes, see the “City Code Table”.
•See “Daylight Saving Time (DST)”for details about DST setting.
4. Press Ato exit the setting screen.
•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.
•The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all modes.
•The day of the week is automatically displayed in accordance with the date (year,
month, and day) settings.
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
To toggle the Timekeeping Mode time between DST and Standard Time
1.In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2.Press Cto display the DST setting screen.
3.Press Dto toggle between Daylight Saving Time
(
ON displayed) and Standard Time ( OFF displayed).
•Note that you cannot switch between Standard Time
and Daylight Saving Time while
GMT is selected as
the Home City code.
4.Press Ato exit the setting screen.
•The DST indicator appears on the display to indicate
that Daylight Saving Time is turned on.
Record number
(Pa
g
e number)
Text
e-DATA MEMORY
You can use the watch’s e-DATA MEMORY to store e-mail
addresses, Web page URLs, and other text data.
You can also use a password to limit access to e-DATA
MEMORY contents.
•All of the operations in this section are performed in the
e-DATA MEMORY Mode, which you enter by pressing
C.
e-DATA MEMORY Management
e-DATA MEMORYcan hold up to 315 characters total,
while each record can contain up to 63 characters. The
maximum number of records depends on the number of
characters per record, as shown below.
•63 characters per record: 5 records
•7 or fewer characters per record: 40 records
To create a new e-DATA MEMORY record
1.In the e-DATA MEMORY Mode, press Dand Bat the
same time to display the remaining memory screen.
•If
0
%is shown for remaining memory, it means that
memory is full. To store another record, you will first
have to delete some of the records stored in memory.
2.Hold down Auntil the flashing cursor (
#
) appears on
the display, which indicates the setting screen.
•The setting screen also shows the record number that
is automatically assigned to the new record.
3.Input the text you want.
•When inputting the text, use D(+) and B(–) to
cycle through characters at the current cursor
location, and Cto move the cursor to the right. See
“Inputting Text”.
4.Press Ato store your data and return to the e-DATA
MEMORY record screen (without the cursor).
•Pressing Acauses the message
SET to appear for about two seconds as the data
is stored. After that, the e-DATA MEMORY record screen appears.
•The text can show only three characters at a time, so longer text scrolls continuously
from right to left. The last character is indicated by the symbol
s after it. Press Ato
stop and restart scrolling.
•Records are stored in memory in the sequence they are created.
Remainin
g
memory (%)
(Light)

—3 —
Press .
Press . Remaining
memory
screen
Record 1
() Record 2
() Password
setting
screen
Remaining Memory Screen Password Setting Screen
•The value on the remaining memory screen is the percentage of memory that is still
available. It does not indicate the number of records that can be stored.
•The Password Setting screen shows
xxxx
when a password is already registered.
•You can use the Password Setting screen to register, edit, or delete your password.
See “Using a Password to Protect e-DATAMEMORY Data”for more information.
To edit an e-DATA MEMORY record
1. In the e-DATA MEMORY Mode, use D(+) and B(–) to display the record you
want to edit.
To recall e-DATA MEMORY records
In the e-DATA MEMORY Mode, use D(+) and B(–) to cycle through e-DATA
MEMORY records as shown below.
2. Hold down Auntil the flashing cursor appears on the display.
3. Use Cto move the flashing to the character you want to change.
4. Use D(+) and B(–) to change the character.
5. After making the changes you want, press Ato store them and return to the
e-DATA MEMORY record screen.
To delete an e-DATA MEMORY record
1. In the e-DATA MEMORY Mode, use D(+) and B(–) to display the record you
want to delete.
2. Hold down Auntil the flashing cursor appears on the display.
3. Press Band Dat the same time to delete the record.
•The message
CLR appears to indicate that the record is being deleted. After the
record is deleted, the cursor appears on the display, ready for input.
4. Input data or press Ato return to the remaining memory screen.
Using a Password to Protect e-DATA MEMORY Data
You can register a 4-digit password to keep e-DATAMEMORY data secure.
Important!
Use a 4-digit password that is easy for you to remember, but difficult for others to
decipher. If you forget the password, you will have to have your watch initialized
(which deletes all data in memory) in order to access the e-DATA MEMORY again. To
have the watch initialized, contact the store or dealer where you purchased it, and ask
to have the AC operation performed.
To register a new password
1.In the e-DATAMEMORY Mode, use D(+) and B(–)
to display the Password Setting screen.
•This displays a screen that shows
SET PASS .
2.Hold down Afor about one second until
NEW
appears, with the first
0
flashing.
•This is the New Password Setting screen.
3.Use D(+) and B(–) to scroll through numbers at the
first digit.
4. When the first digit is the number you want, press Cto advance to the next digit.
5. Repeat steps 3 and 4 to input all four digits of the password you want.
•Pressing Awhile inputting a new password clears your input and returns to the
Password Setting screen.
6. After all four of the password digits are the way you want, press Cto register
them.
•Pressing Ccauses the message
SET to appear for about one second as the
password is stored. After that, the Password Setting screen appears.
•After registering a password, you can input, recall, edit and delete data, if you want.
After you exit the e-DATA MEMORY Mode, you will have to input the password
every time you want to enter it again.
To input the password
1.Enter the e-DATAMEMORY Mode.
2.On the Password Input screen (
xxxx PASS
), press D
or B. This causes the first digit of the password to
flash.
3.Input the password.
•Use D(+) and B(–) to scroll through numbers at
each digit.
•Press Cto advance to the next digit.
•Pressing Awhile inputting the password clears your
input and returns to the Password Input screen.
4.After the password is the way you want, press C.
•If the input password matches the one registered, the
message
OK! appears, followed by an e-DATA
MEMORY screen.
•If the password does not match, the message
ERR
appears, followed by the Password Input screen.
To change the password
1. Enter the e-DATAMEMORY Mode by inputting the current password.
2. Use D(+) and B(–) to display the Password Setting screen.
3. Perform the procedure starting from step 2 under “To register a new password”to
specify the new password.
To delete the password
1. Enter the e-DATAMEMORY Mode by inputting the current password.
2. Use D(+) and B(–) to display the Password Setting screen.
3. Hold down Afor about one second until
NEW appears, with the first
0
flashing.
4. Press Band Dat the same time to delete the password.
•The message
CLR appears to indicate that the password is being deleted. After the
password is deleted, the Password Setting screen appears.
Current time in the zone
of the selected city code
Timekeeping
Mode time
City code
World Time
World Time shows the current time in 27 cities (29 time
zones) around the world.
•All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C.
To view the time in another city code
In the World Time Mode, press Dto scroll through city
codes (time zones) to the east or Bto scroll to the west.
•For full information about city codes, see the “City Code
Table”.
•If the current time shown for a city is wrong, check your
Timekeeping Mode time and Home City code settings
and make the necessary changes.
•Whenthe currently selected timezoneis one that includes
mostly ocean, a value indicating the zone’s Greenwich
Mean Time differential appears in place of a city code.
To toggle a city code time between Standard Time and Daylight Saving Time
1.In the World Time Mode, use Band Dto display the
city code (time zone) whose Standard Time/Daylight
Saving Time setting you want to change.
2.Hold down Afor about one second 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.
•Note that you cannot switch between Standard Time
and Daylight Saving Time while
GMT is selected as the
city code.
Alarm time
(Hour : Minutes)
Alarm number
Timekeeping Mode
time
Alarms
You can set up to five independent multi-function alarms
with hour, minutes, month, and day. When an alarm is
turned on, the alarm tone sounds when the alarm time is
reached. One of the alarms is a snooze alarm, while the
other four are one-time alarms. You can also input
reminder text that appears when the alarm time is
reached.
You can also turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour.
•There are five alarm screens numbered
AL1 through
AL4 for the one-time alarm, a snooze alarm screen
indicated by
SNZ . The Hourly Time Signal screen is
indicated by
SIG .
•In the case of the snooze alarm screen, the snooze
alarm indicator ( ) appears in the lower right corner
of the display.
•Alarm settings (and Hourly Time Signal settings) are available in the Alarm Mode,
which you enter by pressing C.
Alarm Types
The alarm type is determined by the settings you make, as described below.
•Daily alarm
Set the hour and minutes for the alarm time. This type of setting causes the alarm to
sound everyday at the time you set.
•Date alarm
Set the month, day, hour and minutes for the alarm time. This type of setting causes
the alarm to sound at the specific time, on the specific date you set.
•1-Month alarm
Set the month, hour and minutes for the alarm time. This type of setting causes the
alarm to sound everyday at the time you set, only during the month you set.
•Monthly alarm
Set the day, hour and minutes for the alarm time. This type of setting causes the alarm
to sound every month at the time you set, on the day you set.
To set an alarm time
1.In the Alarm Mode, use Dand Bto scroll through the
alarm screens until the one whose time you want to set
is displayed.
Press .
Press .
•To set a one-time alarm, display one of the screens indicated by an alarm number
from
AL1 through AL4 . To set the snooze alarm, display the screen indicated
by
SNZ .
•The snooze alarm repeats every five minutes.
2. After you select an alarm, hold down Auntil the hour setting of the alarm time
starts to flash, which indicates the setting screen.
•This operation automatically turns on the alarm.
3. Press Cto move the flashing in the sequence shown below to select other settings.
Hour TextMinutes Month Day
•Selecting the text causes the text input cursor (
#
) to appear. There are eight
spaces in the text, so you have to press Ceight times to move to the Hour
setting.
4. While a setting is flashing, use D, B, and Cto change it as described below.
Screen
A
12:00
x-xx
#
To do this:
Changethe hour
and minutes
Change the
month and day
Input reminder
text
Do this:
Use D(+) and B(–).
•With the 12-hour format, set the time correctly as a.m.
(Aindicator) or p.m. (Pindicator).
•To set an alarm that does not include a month and/or
day, set
for each setting.
Use D(+) and B(–) to cycle through characters at the
current cursor location, and Cto move the cursor to the
right. See “Inputting Text”.

—4 —
) on itsAlarm Mode
screen.
•In all modes, the alarm on indicator is shown for any
alarm that is currently turned on.
•The alarm on indicator flashes while the alarm is
sounding.
•The snooze alarm indicator ( ) flashes while the
snoozealarmissounding and during the 5-minute intervals
between alarms.
•Turning on a alarm (
AL1 to AL4 , or SNZ ) displays
thealarmonindicator (
To turn the Hourly Time Signal on and off
1.In the Alarm Mode, use Dand Bto select the Hourly
Time Signal (
SIG ).
2.Press Ato toggle it on (
ON
) and off (
OFF
).
•The Hourly Time Signal on indicator ( ) is shown
on the display in all modes while this function is turned
on.
Graphic area
Alarm on indicator
Hourly time signal on
indicator
Hours
Minutes
Seconds
Timekeepin
g
Mode time
Countdown Timer
You can set the countdown timer within a range of
one minute to 24 hours. An alarm sounds when the
countdown reaches zero.
All of the graphic area segments start to flash, starting
from the point the Timekeeping Mode time reaches one
hour before an alarm time. This pre-alarm feature lets you
know that an alarm time is about to be reached.
The alarm tone sounds at the preset time for 10seconds,
regardless of the mode the watch is in. In the case of the
snooze alarm, the alarm operation is performed a total of
seven times, every five minutes, until you turn the alarm
off.
•You can also select auto-repeat, which automatically
restarts the countdown from the original value you set
whenever zero is reached.
•The initial default countdown start time when you
purchase the watch or after you have its battery
replaced is 15 minutes.
•Countdown timer functions are available in the
Countdown Timer Mode, which you can enter using C.
To use the countdown timer
Press Dwhile in the Countdown Timer Mode to start the countdown timer.
•When the end of the countdown is reached and auto-repeat is turned off, the alarm
sounds for 10 seconds or until you stop it by pressing any button. The countdown
time is automatically reset to its starting value after the alarm stops.
•When the end of the countdown is reached and auto-repeat is turned on, the alarm
sounds, but the countdown starts again automatically whenever the countdown
reaches zero.
•The countdown timer measurement operation continues even if you exit the
Countdown Timer Mode.
•Press Dwhile a countdown operation is in progress to pause it. Press Dagain to
resume the countdown.
Mode screen for the initial alarm operation only.
•Performing any one of the following operations during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen
Displaying the
SNZ setting screen
•To completely stop a countdown operation, first pause it (by pressing D), and then
press B. This returns the countdown time to its starting value.
Screen
0:15
OFF
To do this:
Change the hours or minutes
Toggle auto-repeat on (
ON
) and off (
OFF
)
Do this:
Use D(+) and B(–).
Press D.
To set up the countdown timer
1.While the countdown start time is on the display in the
Countdown Timer Mode, hold down Auntil the hour
setting of the countdown start time starts to flash, which
indicates the setting screen.
•If the countdown start time is not displayed, use the
procedure “To use the countdown timer” to display it.
2.Press Cto move the flashing in the sequence shown
below to select other settings.
Auto-repeat
Minutes
Hours
3. While a setting is flashing, use Dand Bto change it as described below.
Seconds
1/100 second
Hours
Minutes
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
•The display range of the stopwatch is 23 hours,
59 minutes, 59.99 seconds.
•The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
•The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
•Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
•All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing C.
To measure times with the stopwatch
Elapsed Time
Start Stop Re-start Stop Clear
Start Split
( displayed)
Split release Stop Clear
Start Split Stop Split release Clear
Split Time
Two Finishes
First runner finishes.
Display time of first
runner.
Second runner
finishes. Display time of second runner.
•The time on the screen may not appear to stop immediately when you press a
button to stop timing or to perform a split operation. Despite this, the time recorded
by your button operation is accurate.
Auto light switch on
indicator
Parallel to ground More than 40 °
•Pressing Band Dat the same time while any setting is flashing automatically
sets the time to AM12:00 and the date to
x-xx
. It also clears any text that is input
for the alarm. 5.Press Ato exit the setting screen.
•If you input reminder text, the text appears in place of
the alarm number.
•If the reminder text is more than three characters, it will
scroll form right to left.
•To stop the alarm tone after it starts to sound, press any
button.
button. Note, however, that pressing Calso changes to
•The pre-alarm feature works in the Timekeeping Mode
only. To stop the pre-alarm after it starts, press any
the e-DATA MEMORY Mode.
•If the alarm has a month and/or day setting, the month/
day appears at the bottom of the display, in place of the
Timekeeping Mode time.
Snooze alarm indicator
Alarm on indicator
•To specify a countdown start time of 24 hours, set
0:00
.
4. Press Ato exit the setting screen.
•
The auto-repeat on indicator ( ) appears on the display while this function is turned on.
•Frequent use of auto-repeat and the alarm can run down battery power.
Backlight
The backlight uses an EL (electro-luminescent) panel that
causes the entire display to glow for easy reading in the
dark. The watch’s auto light switch automatically turns on
the backlight when you angle the watch towards your
face.
•The auto light switch must be turned on (indicated by
the auto light switch on indicator) for it to operate.
•See “Backlight Precautions” for other important
information about using the backlight.
To turn on the backlight manually
In any mode, press Lto illuminate the display for about
one second.
•The above operation turns on the backlight regardless
of the current auto light switch setting.
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.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you at more than 40 degrees causes the backlight to turn on.
•Wear the watch on the outside of your wrist.
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
startle 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.
•If you input reminder text for an alarm, the text appears for one minute on the
Timekeeping Mode screen when the alarm time is reached. You can clear the
reminder text display by pressing A, B, or D, or by exiting the Timekeeping
Mode.
In the case of the snooze alarm, the reminder text appears on the Timekeeping•
Changing the DST setting of the Home City code in the World Time Mode
To test the alarm
Alarm Operation
In the Alarm Mode, hold down Dto sound the alarm.
To turn an alarm on and off
1.In the Alarm Mode, use Dand Bto select an alarm.
2.Press Ato toggle it on and off.

—5 —
Cursor
City Code Table
*Based on data as of December 2004.
– – ––11.0 Pago Pago
HNL Honolulu –10.0 Papeete
ANC Anchorage –09.0 Nome
LAX LosAngeles –08.0 San Francisco, Las Vegas, Vancouver, Seattle/Tacoma,
Dawson City
DEN Denver –07.0 El Paso, Edmonton
CHI Chicago –06.0 Houston, Dallas/Fort Worth, New Orleans,
Mexico City, Winnipeg
NYC New York –05.0 Montreal, Detroit, Miami, Boston, Panama City,
Havana, Lima, Bogota
CCS Caracas –04.0 La Paz, Santiago, Port Of Spain
RIO Rio De Janeiro –03.0 Sao Paulo, Buenos Aires, Brasilia, Montevideo
– – ––02.0
– – ––01.0 Praia
GMT +00.0 Dublin, Lisbon, Casablanca, Dakar,Abidjan
LON London
PAR Paris +01.0 Milan, Rome, Madrid,Amsterdam, Algiers, Berlin,
Hamburg, Frankfurt, Vienna, Stockholm
CAI Cairo +02.0 Athens, Helsinki, Istanbul, Beirut, Damascus,
JRS Jerusalem Cape Town
JED Jeddah +03.0 Kuwait, Riyadh,Aden, AddisAbaba, Nairobi, Moscow
THR Tehran +03.5 Shiraz
DXB Dubai +04.0 Abu Dhabi, Muscat
KBL Kabul +04.5
KHI Karachi +05.0 Male
DEL Delhi +05.5 Mumbai, Kolkata
DAC Dhaka +06.0 Colombo
RGN Yangon +06.5
BKK Bangkok +07.0 Jakarta, Phnom Penh, Hanoi, Vientiane
HKG Hong Kong +08.0 Singapore, Kuala Lumpur, Beijing, Taipei, Manila,
Perth, Ulaanbaatar
TYO Tokyo +09.0 Seoul, Pyongyang
ADL Adelaide +09.5 Darwin
SYD Sydney +10.0 Melbourne, Guam, Rabaul
NOU Noumea +11.0 Port Vila
WLG Wellington +12.0 Christchurch, Nadi, Nauru Island
City City GMT Other major cities in same time zone
Code Differential
To turn the auto light switch on and off
In the Timekeeping Mode, hold down Lfor about one second to toggle the auto light
switch on ( displayed) and off ( not displayed).
•The auto light switch on indicator ( ) is on the display in all modes while the auto
light switch is turned on.
•In order to protect against running down the battery, the auto light switch
automatically turns off approximately six hours after you turn it on. Repeat the above
procedure to turn the auto light switch back on if you want.
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.
Graphic Area
The following describes the information indicated by the graphic area in each mode.
•In the Timekeeping Mode, World Time Mode, and Alarm Mode, the graphic area
indicates the passage of each second of the current time (Timekeeping Mode time).
•In the e-DATA MEMORY Mode, the graphic area indicates the number at the
flashing digit during password input.
•In the Countdown Timer Mode, the graphic area indicates the passage of each
second of the countdown.
•In the Stopwatch Mode, the graphic area indicates the passage of each 1/10 second
of the elapsed time.
Seconds secondInput number 1/10
e-DATA MEMORY Mode Stopwatch ModeTimekeeping Mode
Inputting Text
The following describes how to input text in the e-DATA
MEMORY and Alarm Modes.
To input characters
1.When the cursor is on the display, use Dand Bto
cycle through the available letters, numbers and
symbols, in the sequence shown below.
(space)
to
(symbol) to (number)
Press . Press .
to
(lower-case) to (upper-case)
2. When the character you want is at the cursor position, press Cto move the cursor
to the right.
3. Repeat steps 1 and 2 to input the rest of the characters you want.
•See the “Character List” for information about the characters you can input.
Auto Return Features
•If you leave the watch in the e-DATAMEMORY orAlarm 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 exits the setting
screen. Except for password input, any settings you have made up to that point are
saved automatically.
Scrolling
The Band Dbuttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a scroll
operation scrolls at high speed.
Initial Screens
When you enter the e-DATAMEMORY, World Time, or Alarm Mode, the data you were
viewing when you last exited the mode appears first.
Timekeeping
•Resetting the seconds to
00
while the current count is in the range of 30 to 59
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to
00
without changing the minutes.
•The year can be set in the range of 2000 to 2039.
•The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to change
it except after you have the watch’s battery replaced.
World Time
•The current time in all World Time Mode cities is calculated in accordance with the
Greenwich Mean Time (GMT) differential for each city, based on the current Home
City time setting in the Timekeeping Mode.
•The seconds count of the World Time is synchronized with the seconds count of the
Timekeeping Mode.
•The GMT differential is the time difference of the time zone where the city is located
from Greenwich Mean Time.
•GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC) data.
Backlight Precautions
•The electro-luminescent panel that provides illumination loses power after very long
use.
•The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
•The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
•The backlight automatically turns off whenever an alarm sounds.
•Frequent use of the backlight shortens the battery life.
Auto light switch precautions
•Wearing the watch on the inside of your wrist and movement or vibration of your arm
can cause the auto light switch to activate and illuminate the display. To avoid
running down the battery, turn off the auto light switch whenever engaging in
activities that might cause frequent illumination of the display.
•The backlight may not light if the face of the watch is
more than 15 degrees above or below parallel. Make
sure that the back of your hand is parallel to the ground.
•The backlight turns off in about one second, even if you
keep the watch pointed towards your face.
•Static electricity or magnetic force can interfere with
proper operation of the auto light switch. If the backlight
does not light, try moving the watch back to the starting
position (parallel with the ground) and then tilt it back
toward you again. If this does not work, drop your arm
all the way down so it hangs at your side, and then bring
it back up again.
•Under certain conditions, the backlight may not light until about one second after
you turn the face of the watch towards you. This does not necessarily indicate
malfunction of the backlight.
•You may notice a very faint clicking sound coming from the watch when it is shaken
back and forth. This sound is caused by mechanical operation of the auto light
switch, and does not indicate a problem with the watch.
Character List

— 6 —
3. DRAWINGS: MODULE QW-2957
3-1. LCD DIAGRAM
X0Y1
U9U8
U7
X16Y4X16Y3X16Y2
X16Y1
X16Y0 X15Y4X15Y3X15Y2
X15Y1
X15Y0 X14Y4X14Y3X14Y2
X14Y1
X14Y0 X13Y4X13Y3X13Y2
X13Y1
X13Y0 X12Y4X12Y3X12Y2
X12Y1
X12Y0 X11Y4X11Y3X11Y2
X11Y1
X11Y0 X10Y1 X10Y2 X10Y3 X10Y4
X10Y0 X9Y4X9Y3X9Y2X9Y1
X9Y0 X8Y4X8Y3X8Y2X8Y1
X8Y0 X7Y4X7Y3X7Y2X7Y1
X7Y0 X6Y4X6Y3X6Y2X6Y1
X6Y0 X5Y4X5Y3X5Y2X5Y1
X5Y0 X4Y4X4Y3X4Y2X4Y1
X4Y0 X3Y4X3Y3X3Y2X3Y1
X3Y0 X2Y4X2Y3X2Y2X2Y1
X2Y0 X1Y4X1Y3X1Y2X1Y1
X1Y0 X0Y4X0Y3X0Y2
X0Y0
L18
L19
L20
L21
L22
L23
L24
LC5LC1 LC2 LC3 LC4
L 3
L 4
L 5
L 6
L 7
L 8
L 9
L10
L11
L12
L13
L14
L15
L25
L26
L27
L16
L17
COM.
SEG.
L47
L46
L45
L28
L29
L30
L31
L32
L33
U6
U5
U4 U3 U2 U1 U0
A1P1 A0 REPP0
f9 e9 DST0 f5 e5
a5 g5 d5
a9
g9 d9 b5 c5 DST1
b9 c9 f4 e4
f8 e8 a4 g4 d4
d8 b4 c4
b8
g8 a8
c8 MIN COL0
HYP COL1 f3 e3
f7 e7 a3 g3 d3
g7 d7 b3 c3
b7 c7 f2 e2
a2 g2 d2
SEC b2 c2 PERAUTO f1 e1
a1 g1 d1
ALM0 c1
b1 e0
SIG f0
a0 g0 d0
b0
SNZ1 c0
a7
e6
f6 a6
d6
g6
b6 c6
L40
L39
L34
L35
L36
L37
L41
L42
L43
L44
LC5LC1 LC2 LC3 LC4
L38
L52
L51
L50
L49
L48
COM.
SEG.
X0
L3 L4 L5 L6 L7 L8 L9
L10 L11 L12 L13 L14 L15 L16 L17 L18 L19 LC1 LC2 LC3 LC4 LC5
L51 L52 L50 L49 L48 L47 L46 L45 L44 L43 L42 L41 L40 L39 L38 L37 L36 L35 L34 L33 L32 L31 L30 L29 L28 L27
SNZ1
SIG
ALM0
Y3
Y4
Y0
Y2
Y1
HYP
COL0
e6d6
g6
c6
f6 a6 b6
e0
d0
g0
c0
f0
a0
b0
e1
d1
g1
c1
f1
a1
b1
e2
d2
g2
c2
f2
a2
b2
e3
d3
g3
c3
f3
a3
b3
e4
d4
g4
c4
f4
a4
b4
e5
d5
g5
c5
f5
a5
b5
e7d7
g7
c7
f7 a7 b7
e8d8
g8
c8
f8 a8 b8
e9d9
g9
c9
f9 a9 b9
X16
U9U8U7U6U0 U5U4U3U2U1
MIN
DST0
P0
A0
REP
A1
P1
DST1
AUTO
SEC
PER
COL1

—7 —
3-2. CIRCUIT DIAGRAM
LSI
TOTAL 93PINS
BONDING 87PINS
LCD (4.5V 1/3b 1/5d)
✽ 1. GND-KI6: Short (Soldering)
GND-KI7: Short (Soldering)
KC2-KI2: Open (No Soldering)
KC3-KI2: Open (No Soldering)
KC4-KI2: Open (No Soldering)
KC2-KI9: Open (No Soldering)
KC3-KI9: Open (No Soldering)
KC4-KI9: Open (No Soldering)
✽ 2. Latch Type Key
✽ 3. Short (Soldering) (N trimming)
✽ 4. No bonding
✽ 5. If the circuit is wired as same as the LED drive circuit as shown
in dash line, LD3KC3 (Normal Low) pin is used as the LD pin.
Therefore, LD3KD3 pin is not specified as a soldering pad.
Also, all the parts shown in dash line are not mounted if LED is
not mounted.
✽ 6. Normal High
✽ 7. KC3 is used in this module.
✽ 8. KC2 is used in this module.
IC
GND VDD2
BAT
VCHVDD3 VC1 VC2
C3
C2 C4
XTB
Xtal
L3 - - - - - - L52 LC1 - - - LC5
CT
LD1
S1
S2
S3
VDD1
C1
BD
LL1
Tr1
XT
T1
T2
KI1
KI2
KI3
KI4
KI9
KI6
KI7
KI8
KI5
N1
S4
PZ
VOSC
C5
SDO
AC
✽1
KC4
LD3KC3
LD2KC2
KC1
N2
N3
✽3
✽3
✽2
N4
✽3
Z
✽2
✽2
✽2
CSB
✽3
SA
C6
SK KS
✽2
SDI SCK
✽1✽2
L1 L2
CLF1
E'
Cel
EL LL2
L+
VOUT
L–
GND
CLF2
V+
BACK
FRONT
✽1
✽4✽4✽4
✽4
✽1
✽1
✽1
✽1
✽1
✽1
Tr2
R1 LED
✽5
✽5
✽4✽4

— 8 —
3-3. CHECKING TERMINALS AND COMPONENTS
Short pad for switching modules
CAPACITOR/TRIMMER
(10097666)
CUSHION 506
(72119631)
CUSHION 6
(72110064)
OSCILLATOR/CRYSTAL
(71101263)
CUSHION 506
(72119631)
SENSOR/TILT
(71055275)
Short pad for N trimming
12. PCB ASS'Y
(76409012)
LD3KC3
LD3KC3
KI9 KC1
KI9
KI9
KC4
KC4
KC4
N4
N4
N3 N3
N2 N2
N1 N1
T2 T1
KI7
KI7
KI6
KI6
XT
KI8
KI4
KI5
KI3
KI1
VOUT
GND
GND
GND
KI8
BD
LD2KC2
LD2KC2
LD2KC2
XTB
KI2
VDD1
VOSCVCH
L+
LD1
AC
CLF1
CLF2
L–
VC1
VDD3
VC2
KC1 LED1
R1
VDD2
GND
LD3KC3
LL1
KI5
VOSC
VCH
KI1
KI3
L+
L–
KI4
VOUT
VC1
VDD2
KI2
XT
XTB
VC2
VC1
CLF1CLF2
GND
VDD2
GND
XT
LL1
GND
VDD2
LL1
LL1
BD
GND VOSC
VCH
GND
LD3KC3
LED1
GND
VDD2
R1
LD1
GND
AC
VDD2
KI8
KC1
KI9
GND VDD3
VDD1
GND
GND
GND
GND
KC1 KI9
KI9
KI9
KI2
KI2
KI2
LD3KC3
GND
GND
GND
GND

— 9 —
4. EXPLODED VIEW: MODULE QW-2957
10a (10193878)
10b (10193879)
8 (10201005)
6 (10201012)
17 (10208889)
12 (76409012)
PCB ass'y
15 (72019599)
7 (10076070)
5 (10097687)
9 (10201006)
16 (10201009)
2 (72360283)
14 (72330952)
Battery/Lithium
(CR2016)

5. PARTS LIST: MODULE QW-2957
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 ---------------------------------------
-
Less important
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 S
p
ecification A
pp
licable Q R
76408949 MODULE/WITHOUT MOVEMENT QW-2957AT-01TK G-7600-1V/2V 1 A
G-7600R-3V/9V
76408950 MODULE/WITHOUT MOVEMENT QW-2957AT-02TK G-7600-9V 1 A
1 10097666 CAPACITOR/TRIMMER CTZ2E-25C-W2-P QW-2957 Common 1 B
2 72360283 CONTACT/BATTERY(-) 1828 Q359948B-1 QW-2957 Common 1 C
3 72110064 CUSHION 6 Q4914-1 QW-2957 Common 1 C
4 72119631 CUSHION 506 Q49364-1 (QW-506C01) QW-2957 Common 2 C
5 10097687 CUSHION 2549 Q470646-1 QW-2957 Common 1 C
6 10201012 EL YEL-2957-A-01 QW-2957 Common 1 A
7 10076070 HOLDER/BATTERY 2709 Q255451-1 QW-2957 Common 1 C
8 10201005 INTERCONNECTOR/ 2957-1 RJQ525786-001V01 QW-2957 Common 1 C
9 10201006 INTERCONNECTOR/ 2957-2 RJQ525787-001V01 QW-2957 Common 1 C
10a 10193878 LCD C2957-01THP QW-2957AT-01TK 1 A
10b 10193879 LCD C2957-02THP QW-2957AT-02TK 1 A
11 71101263 OSCILLATOR/CRYSTAL DT-26S07 QW-2957 Common 1 B
12 76409012 PCB ASS'Y RJQ526298*001V01TK QW-2957 Common 1 A
13 71055275 SENSOR/TILT TS-2418-P QW-2957 Common 1 B
14 72330952 SHEET/INSULATION 1028 Q434476-1 QW-2957 Common 1 C
15 72019599 SPRING/COIL 967-1 Q430081-1 QW-2957 Common 1 B
16 10201009 SPRING/COIL 2957-1 RJQ525614-001V01 QW-2957 Common 2 B
17 10208889 TAPE/ADHESIVE RJQ528339-001V01 QW-2957 Common 1 C
For the prices and minimum order/suppl
y
quantities of the above parts, refer to the Parts Price List P.P.L.-621.
Notes: Q - Used quantity
R - Rank — 10 —

— 11 —
6. PRECAUTIONS FOR REPAIR: MODULE QW-2957
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 negative (–) side of 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 an arrows.
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 Dbutton, press Aand 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”
Push any button except for Dbutton.
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-2957
Metallic tweezers
A
C
B
D
L

Ver. 1 : Sep. 2005
Addition of the operation chart (page 2 to 5)
Correction of page 11
CASIO COMPUTER CO.,LTD.
Overseas Service Division
6-2, Hon-machi 1-Chome
Shibuya-ku, Tokyo 151-8543, Japan