Casio WV-54DA Troubleshooting guide

SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-2510
MODULE NO.
R
REF. NO. S/M-768
MAR. 2002
WV-54DA

CONTENTS
Page
1. SPECIFICATIONS: QW-2510..................................................................... 1
2. OPERATION CHART: QW-2510................................................................ 2
3. DRAWINGS: QW-2510
3-1. LCD DIAGRAM ................................................................................... 6
3-2. CIRCUIT DIAGRAM ............................................................................ 7
3-3. CHECKING TERMINALS AND COMPONENT .................................. 8
4. EXPLODED VIEW: QW-2510..................................................................... 9
5. PARTS LIST: QW-2510.............................................................................10
6. PRECAUTIONS FOR REPAIR: QW-2510
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE...........................11
6-2. ACCURACY CHECKING ................................................................... 11

— 1 —
1. SPECIFICATIONS: QW-2510
Battery CR2016
Battery life Approx. 2 years
Current consumption 1.98 µA maximum
Alarm system Piezo plate on Back cover
Accuracy ±15 sec./month
Accuracy setting system Trimmer capacitor
Accuracy checking See page 11
Functions • Electro-luminescent backlight
Afterglow
• Time calibration signal reception
Auto receive (2:00AM, 4:00AM, and 6:00AM)
Manual receive
Last date/time received display
• Time Calibration Signal
Call sign: DCF77 (Mainflingen, Germany)
Frequency: 77.5 kHz
Range: Approximately 1,000 km
• e-DATA MEMORY
Memory capacity:
Maximum Number of Records: 40 (7 characters per record)
Minimum Number of Records: 5 (63 characters per record)
Input: Variable length
Others: Remaining memory indicator
• World time
29 time zones (30 cities), daylight saving time on/off
• 1/100-sec. stopwatch
Measuring capacity: 23:59'59.99"
Measuring modes: Elapsed time, split time, 1st-2nd place times
• Daily alarm
5 independent daily alarms
Silent alert
Rminder message display
Snooze feature for one alarm only (10-sec. alarm; up to 7 repeats
at intervals of approximately 5 min.)
• Hourly time signal
• Auto-calendar (to year 2039)
• 12/24-hour format
• Regular timekeeping: Hr, min, sec, pm, month, date, day
Item Detail

— 2 —
2. OPERATION CHART: QW-2510
General Guide
•Press Cto change from mode to mode.
•In any mode, press Lto illuminate the display.
Data Memory
Mode
Stopwatch Mode
Timekeeping Mode
Alarm Mode
▲ ▲
▲
▲
Press C.
▲
World Time Mode
CurrentTime Setting
This watch automatically adjusts its time setting in accordance with a time
calibration signal.You can also perform a manual procedure to set the time and
date, when necessary.
•Before using the watch in the Continental United States, first use the
procedure under “Setting Up the Watch for Use in the Continental United
States” on the next page 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 theTime and Date Manually” for information about manual
settings.
•Before using the watch in Japan, first specify your Home City, select the DST
setting you want to use, and then perform the procedure under “To perform
manual time calibration signal reception” .
Timekeeping
Use the Timekeeping Mode to set and view the current time and date.
•Pressing Adisplays the Last Signal screen (date and time the time
calibration signal was last received) in the Timekeeping Mode.
Last Signal Screen
▲
Press A.
Seconds
Hour : Minutes
Receive date
Receive time
Month – Day Day of week
PM
indicator
▲
3. Use D(+) and A(–) 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: Los Angeles, San Francisco, LasVegas,
Seattle
DEN: Denver, El Paso
CHI: Chicago, Houston, Dallas/Fort Worth, New
Orleans
NYC: NewYork, Detroit, Miami, Boston
4. Press Cto display the summer time (DST) setting
screen.
5.Use Dto select AUTO DST.
•AUTO DST specifies auto switching between
Daylight Saving Time and Standard Time.
6. Press Bto exit the setting screen.
7. Hold down Afor about two seconds until the
watch beeps.
•Release Aand the message receiving appears to
indicate that signal reception has started.
•Time calibration signal reception takes from two to
six minutes.Take care that you do not move the
watch during this time.
Setting Up theWatch 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 theTime 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 the Continental United States
1.In the Timekeeping Mode, press B.This causes
the current auto receive on/off setting (the receive
indicator) to flash, which indicates the setting
screen.
2. Press Ctwice to move the flashing to the city
code setting.
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City code
Receive indicator
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GMT differential
Receive indicator (E-14)
If the watch is indoors, we recommend that you place the watch near a
window to allow better 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 three times
each day and makes appropriate adjustments.With Manual Receive, you
perform a specific button operation to receive the calibration signal.
Before performing a signal receive operation, remove the watch from you wrist
and position it as shown in the illustrations below.
•If your watch has a resin band, pass the end of the band through the band
loop and place the watch on a stable surface.
Resin band Metal band
Pass through band loop.
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.
To perform manual time calibration signal reception
1.Place the watch on a stable surface so its top (12 o'clock side) is facing in
the general direction of the signal transmitter.
•Note that signal reception is poor if the watch is on its back or side.
2.In the Timekeeping Mode, hold down Afor about
two seconds until the watch beeps.
•Release Aand the message receiving appears to
indicate that signal reception has started.
•Time calibration signal reception takes from two to
six minutes.Take care that you do not move the
watch during this time.
•After signal reception is complete, the display of the
watch changes to the Last Signal screen.
•The receive indicator indicates that the calibration
time reception attempt was successful.
Receive indicator
•Even in an area where signal strength is strong, it takes about 10 seconds for
signal reception to stabilize enough for the receive indicator to indicate signal
strength.
•Use the receive indicator as a guide for checking signal strength and for
finding the best location for the watch during signal receive operations.
•The receive indicator remains on the display in all modes following reception
of the time calibration signal and calibration of the watch’s time setting.The
receive indicator does not appear if signal reception was unsuccessful or
after manual adjustment of the current time setting.
Note
•To interrupt a receive operation and return to the Timekeeping Mode, press
A.
•If the receive operation is unsuccessful, the message ERROR! 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 ERROR! screen to the normal
timekeeping screen by pressing A.
About the Receive Indicator
The receive indicator shows the strength of the calibration signal being received.
For best reception, be sure to keep the watch in a location where signal strength is
strongest.
Weak Strong
Receive indicator

— 3 —
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, 4:00 AM and 6:00 AM each day (calibration times).
Note
•The auto receive operation is performed only if the watch is in theTimekeeping
or WorldTime Mode when one of the calibration times is reached.
It is not performed if a calibration time is reached while you are making
settings (while settings are flashing on the display), while an alarm is
sounding, or while a silent alert operation is being performed.
•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 receive indicator indicates that either the 2:00 AM, 4:00 AM, or 6:00 AM
calibration signal reception was successful.Note, however, that the receive
indicator is cleared from the display at 3:00 AM each day.
•If you do not see the receive indicator 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.
•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, 4:00 AM and 6:00 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, 4:00 AM and 6:00 AM, regardless of whether or
not the Timekeeping Mode time is actually the correct time.
•When two or three 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, press B.This causes
the current auto receive on/off setting (the receive
indicator) to flash, which indicates the setting
screen.
2.Press Dto toggle auto receive on (ON) and off
(OFF).
3.Press Bto exit the setting screen.
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Auto
Receive
Seconds
DST
Frequency 12/24-Hour
Format
City Code
Month Year Minutes Hour
Day
Setting theTime and Date Manually
Make sure you select your Home City code (the city code whose time and date
you are setting) before change the current time and date settings.World Time
Mode times are all displayed in accordance with the Timekeeping Mode
settings.Because of this, World Time Mode times will not be correct if you do
not select the proper Home City code before setting the time and date in the
Timekeeping Mode.
To set the current time and date manually
1.In the Timekeeping Mode, press B.This causes
the current auto receive on/off setting (the receive
indicator) to flash, which indicates the setting
screen.
2.Press Cto move the flashing in the sequence
shown below to select other settings.
3.When the setting you want to change is flashing, use Aand/or Dto
change it as described below.
ScreenSetting
Auto Receive
Frequency
City code
DST
12/24-Hour
format
Hour, Minutes
Seconds
Month, Day,Year
Button Operations
Press Dto toggle auto receive on and off.
When TYO (Tokyo) is selected as the city
code, press Dto toggle the calibration
signal reception frequency among Auto
(FREQ. AT), 40KHz (FREQ. 40) and 60KHz
(FREQ. 60). Note that frequency selection is
available for the TYO city code only.
Use D(+) and A(ñ) to change the setting.
Press Dto toggle between Daylight Saving
Time (ON) and standard time (OFF).
Pressing Dperforms a different operation
when HKG, TYO, SEL, NYC, CHI, DEN,
LAX, ANC or HNL is selected as Home
City Code.See “Auto Summer Time (DST)
Switching”.
Press Dto toggle between 12-hour (12H)
and 24-hour (24H) timekeeping.
Use D(+) and A(–) to change the
setting.
Press Dto reset the seconds to 00.
Use D(+) and A(–) to change the
setting.
4.Press Bto exit the setting screen.
•The auto receive setting is used for time calibration signal reception only. See
“About Auto Receive” for details.
•See “City CodeTable” at the back of this manual 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.
World Time
WorldTime shows the current time in 30 cities (29
time zones) around the world.
•For full information on city codes, see the “City
Code Table” at the back of this manual.
•The current time for all city codes in theWorldTime
Mode is calculated in accordance with the
Greenwich Mean Time (GMT) differential for each
city, based on the your Home City time setting.
•All of the operations in this section are performed in
the World Time Mode, which you enter by pressing
C.
Current time in the
selected city code
City code
GMT
differential
To view the time in another city code
While in the World Time Mode, press Dto scroll through the city codes (time
zones) to the east or Ato scroll to the west.
•If the current time shown for a city is wrong, check yourTimekeeping Mode
time and Home City settings and make the necessary changes.
To toggle a city code time between standard time and Daylight SavingTime
1.In the World Time Mode, use Aand Dto display
the city code (time zone) whose standard time/
Daylight Saving Time setting you want to change.
2.Press Bto 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 Timekeeping
Mode’s Home City code time.
To display Alarm Mode screen
In the Alarm Mode, use Dto cycle through the alarm screens as shown
below.
The following alarm screen names appear in the
center of the display to indicate the alarm whose
screen is currently displayed.
ALARM1 through ALARM4: One-time alarm screen
SNOOZE: Snooze alarm screen
SIGNAL: Hourly Time Signal screen
The currently displayed alarm screen is also
indicated by the alarm name indicators along the
bottom left of the watch’s display.
ALARM1 ALARM2 ALARM3 ALARM4 SNOOZE SIGNAL
Alarm1
Alarm2
Alarm3
Alarm4
Snooze
Alarms
The Alarm Mode gives you a choice of four one-time
alarms and one snooze alarm.You can select either
an audible beeper or flashing silent alert to let you
know when any of the alarm times is reached.
You can also input reminder text that appears when
the alarm time is reached.
Also use the Alarm Mode to turn the Hourly Time
Signal on and off.
•All of the operations in this section are performed in
the Alarm Mode, which you enter by pressing C.
Alarm time
Alarm on indicator
Alarm screen name/
Reminder text
Alarm name
indicator
To set an alarm
1.In the Alarm Mode, use Dto select the alarm
whose time you want to set.
2.Press Band the hour setting of the alarm time
starts to flash, which indicates the setting screen.
•Pressing Aand Dat the same time resets the
alarm time to 12:00 AM, and clears the reminder
text in the upper part of the display (if there is any).
3.Press Cto move the flashing in the sequence
shown below to select other settings.
•Selecting the text causes the text input cursor to appear.You can input up
to eight characters of reminder text for each alarm.
•There are eight spaces in the text, so you have to press Ceight times to
move to the Hour setting.
4. When the setting you want to change is selected, use Aand Dto change it.
•While the hour or minute setting is flashing, use D(+) and A(–) to
change it.
•When setting the alarm time using the 12-hour format, take care to set the
time correctly as a.m. (no indicator) or p.m.(Pindicator).
•When inputting text, use Aand Dto cycle through characters at the
current cursor location, and Cto move the cursor to the right. See
“Inputting Text”for more information.
5.Press Bto exit the setting screen.
•If you input reminder text, the text appears in place of the alarm screen name
when you exit the setting screen.
•If the reminder text has more than six characters, it will scroll from right to left
whenever it is displayed.
MinutesHour Text

— 4 —
•Press any button to stop the alarm after it starts to sound.
•If any alarm operation (one-time alarm, silent alert, snooze) occurs while a
signal receive operation is in progress, the receive operation is canceled.
•In the case of the snooze alarm, the alarm operation repeats up to seven
times every five minutes until the alarm is turned off.
•If you input reminder text for an alarm, the text appears for one minute in
place of the date on the Timekeeping Mode screen.The text is cleared from
the Timekeeping Mode screen if you change to another mode while it is
displayed.
•Alarm operations and the Hourly Time Signal operation are performed in all
modes.
See page about selecting the alarm operation type.
Alarm Operation
The following table describes the different types of alarm operations that this
watch can perform. Alarm Operation
Type
Alarm off
Alarm on
Alert on
Description
•Nothing happens when the alarm
time is reached.
•The alarm on indicator and alarm
name indicator flash on the
display for 10 seconds.
•The watch beeps for 10 seconds.
•The alert on indicator and alarm
name indicator flash on the
display for 10 seconds.
•The watch does not beep.
Snooze
indicator
Alert on
indicator
Alarm on indicator
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
To select the alarm operation type
1.In the Alarm Mode, use Dto select the screen for the alarm (ALARM1 to
ALARM4, or SNOOZE) whose alarm type you want to select.
2. Press Ato cycle through the available settings in the sequence shown below.
•The alarm on indicator ( ) and alarm name indicator are displayed for each
alarm (1 through 4, snooze) for which alarm on is selected.The alert on indicator
( ) and alarm name indicator are displayed for each alarm (1 through 4,
snooze) for which alert 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 or alert on indicator is shown for any
alarm (ALARM1 through ALARM4, or SNOOZE) that is currently turned on.
To turn the HourlyTime Signal on and off
1.In the Alarm Mode, use Dto select the Hourly
Time Signal (SIGNAL).
2.Press Ato toggle it on (SIG displayed) and off
(SIG not displayed).
•The Hourly Time Signal on indicator (SIG) is shown
on the display in all modes while this function is
turned on.
Alarm onAlarm off Alert on
Cursor
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Data Memory
You can use the watch’s data memory to store e-mail
addresses,Web page URLs, and other text data.
•All of the operations in this section are performed in
the Data Memory Mode, which you enter by
pressing C.
Data Memory Records
Each data memory record can contain up to 63
characters.Records are stored in memory in the
sequence they are created.
•The number of records you can store in data
memory depends on the number of characters that
make up each record.See “Data Memory
Management” for more information.
To create a new data record
1.In the Data Memory Mode, press Aand Dat the
same time to display the remaining memory screen.
•You do not have to perform the above step if the
remaining memory screen is already on the display.
•If REST 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.Press Band the flashing cursor appears on the
display, which indicates the setting screen.
3.Use Aand Dto cycle through characters at the
current cursor location, and Cto move the cursor
to the right. See “InputtingText” for more information.
•If memory becomes full while you are inputting
text, the cursor will jump to the first (leftmost)
character of the text when you press C, instead
of advancing to the right.
Remaining memory
4.Press Bto store your data and return to the data
memory record screen (without the cursor).
•The message SAVE! appears for about two
seconds, followed by a data memory record
screen, which shows the text you just input in the
upper part of the display, and a record number
automatically assigned by the watch in the lower
part of the display.
•While the record number is in the lower part of the
display, you can see only six characters of the text
in the record.You can scroll through the text on the
screen by pressing D.See “To recall data memory
records” on the next page for more information.
Record number
Text
To recall data memory records
1.In the Data Memory Mode, press Ato scroll forward through data memory
records.
•Each press of Aadvances to the next record and shows its record
number and first six characters of its text.
•Pressing Awhile the last record in memory is on the display changes to
the remaining memory screen. Pressing Aagain displays the first record.
2.Press Dto scroll through the text on the screen.
•An end mark indicates the end of the text.
▲
First six characters
Pressing Dscrolls through the text.
End mark
▲
To edit a data memory record
1.In the Data Memory Mode, display the record you want to edit.
2.Press Band the flashing cursor appears on the display.
3.Press Cto move the flashing to the character you want to change.
4.Use Dand Ato change the character.
5.After making the changes you want, press Bto store them and return to the
data memory record screen.
To delete a data memory record
1.In the Data Memory Mode, display the record you want to delete.
2.Press Band the flashing cursor appears on the display.
3.Press Aand Dat the same time to delete the record.
•The message CLEAR! 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 Bto return to the remaining memory screen.
Stopwatch
The stopwatch lets you measure elapsed time,
split times, and two finishes.
•The display range of the stopwatch is 23
hours, 59 minutes, 59.99 seconds.
•The stopwatch continues to run, restarting
from zero after it reaches its limit, until you
stop it.
•Exiting the Stopwatch Mode while a split time
is frozen on the display clears the split time
and returns to elapsed time measurement.
•The stopwatch measurement operation
continues even if you exit the Stopwatch
Mode.
•All of the operations in this section are
performed in the Stopwatch Mode, which you
enter by pressing C.
Hours
Seconds 1/100 second
Minutes
To measure times with the stopwatch
ElapsedTime
D
Start Stop
➤Re-start Clear
D
➤Stop
D
➤
D
➤
A
SplitTime
D
Start Split
➤Split release Clear
A
➤Stop
A
➤
D
➤
A
Two Finishes
D
Start Split
➤Stop Clear
A
➤Split release
D
➤
A
➤
A
First runner
finishes.
Display time of
first runner.
Second runner
finishes. Display time of
second runner.
(SPL displayed)
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 Alarm or Data Memory 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 Aand Dbuttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during
a scroll operation scrolls through the data at high speed.
Initial Screens
When you enter the Alarm or World Time Mode, the data you were viewing
when you last exited the mode appears first.

— 5 —
Time Calibration Signal Reception
•This watch is designed to receive a time calibration signal originating from
one of the three transmitters listed below.
•When you select one of the city codes shown below as your Home City code,
the watch sets up automatically to receive from the applicable transmitter.
Time calibration signal reception is not possible whenever any other city code
is specified as the Home City code.
•When you select TYO as your Home City code, the watch automatically
selects either the Fukushima signal (40kHz) or the Fukuoka/Saga signal
(60kHz), depending on which is stronger.
•Note that when TYO (Japan) is selected as the Home City code, you can
specify one of two different time signal transmitters.
Location
Fort Collins, Colorado
Fukushima, Japan
Fukuoka/Saga, Japan
Frequency
60kHz
40kHz
60kHz
Call Sign
WWVB
JJY
JJY
Home City Code
LAX, DEN, CHI, NYC
TYO
ReceivedTransmitter
Fort Collins, Colorado
Fukushima or Fukuoka/Saga, Japan
(selectable)
•Signal reception is possible within a radius of about 2,000 miles (3,000
kilometers) from the Fort Collins transmitter.
•At distances further than about 500 kilometers from the Fukushima and
Fukuoka/Saga transmitter, the signal may become weak and reception may
be impossible under certain conditions.
General Precautions
•The watch is designed to automatically update the date and day of the week
for the period January 1, 2000 to December 31, 2039.Setting of the date by
the time calibration signal cannot be performed starting from January 1,
2040.
•This watch can receive signals that differentiate between leap years and non-
leap years.
•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.
•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.
•Think of the watch as acting like aTV or radio when it is receiving the
calibration signal.When receiving indoors, move to a location as near as
possible to a window.
•Proper signal reception can be difficult or even impossible under the
conditions listed below.
Near TVs, refrigerators, computers, or other household appliances
Far away from broadcasting stations among ferro-concrete structures or near
mountains
Underground, in tunnels or in ferro-concrete buildings
Near high-tension wires, neon signs, or radio stations with interfering
frequencies
Near railroads, highways or airports
In trains or cars
•Radio interference can make signal reception impossible.
•Strong electrostatic charge can result in the wrong time being set.
•If you are in an area where proper time calibration signal reception is
impossible, the watch keeps time with the precision noted in “Specifications.”
Fort Collins
2,000 miles
1,200 miles
1,000
kilometers
1,000
kilometers
Fukuoka/Saga
500
kilometers
Fukushima
500
kilometers
Troubleshooting
Check the following points whenever you experience problems with your watch.
Problem
Cannot perform
manual receive.
Auto receive is
turned on, but
the receive
indicator does
not appear on
the display.
Time setting is
incorrect
following signal
reception.
Probable Cause
The watch is not in the Timekeeping Mode.
•You changed the time setting manually.
•The watch was not in theTimekeeping
or World Time Mode, or you were
performing some button operation
during the auto signal receive operation
was performed.
•Even if receive is successful, the
receive indicator disappears every day
at 3am.
•If the time is one hour off, the DST
setting may be incorrect.
•The Home City Code setting is not
correct for the area where you are using
the watch.
What you should do
Enter the Timekeeping Mode
and try again.
•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.
•
Put the watch in a location
that is suitable for good
reception.
•Change the DST setting to
AUTO DST.
•Select the correct Home City
Code.
Auto SummerTime (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.
•The time calibration signals transmitted from the Fukushima and Fukuoka/
Saga do not include summer time data.
•When using the watch in the Continental United States or in Japan, select
AUTO DST for the auto summer time setting.
•The default auto summer time settings is AUTO DST whenever you select
one of the following city codes as your Home City code:HKG, TYO, SEL,
NYC, CHI, DEN, LAX, ANC, or HNL.
•If you experience problems receiving the time calibration signal in your area,
it is probably best to turn off auto time switching.
•See page about configuring summer time (DST) settings manually.
To select the auto summer time setting
1.In the Timekeeping Mode, press B.This causes the current auto receive
on/off setting (the receive indicator) to flash, which indicates the setting
screen.
2.Press Cthree times until the summer time (DST) setting screen appears.
3. Use Dto cycle through the summer time settings in the sequence shown
below.
4.When the setting you want is selected, press Bto 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 2039.
•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.
•The current time for all city codes in theTimekeeping 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-hourTimekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode
is also applied in all other modes.
•With the 12-hour format, the P(PM) indicator appears on the display for
times in the range of noon to 11:59 p.m. and the no indicator appears for
times in the range of midnight to 11:59 a.m.
•With the 24-hour format, times are displayed in the range of 0:00 to 23:59,
with 24 indicator.
InputtingText
The following describes how to input text in the Alarm and Data Memory
Modes.
To input characters
1.When the cursor is on the display, use Aand D
to cycle through the available letters, numbers and
symbols, in the sequence shown below.
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” at the back of this manual for information about the
characters you can input.
Data Memory Management
Data memory can hold up to 315 characters total, while each record can
contain up to 63 characters.This means that 40 records can be stored in data
memory when each record contains seven characters of text or less.
Backlight Precautions
The backlight uses an EL (electro-luminescent) panel that causes the entire
display to glow for easy reading in the dark.
In any mode, press Lto illuminate the display for about one second.
•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.
l
l
l
l
l
l
l
l
l
Press D.
a to z
(lower-case)
(space)
*
to +
(symbol)
0 to 9
(number)
A to Z
(upper-case)
Press A.
ReminderText Input
Screen
Cursor

— 6 —
3. DRAWINGS: QW-2510
3-1. LCD DIAGRAM
X36
y4
y3
y2
y1
X0
y0
alm0
W0
W1 W2 W3
W4
rc3
rc2
rc1
rc1
rc2
rc3
alert
snz
alm4
alm3
alm2
alm1
sig
dst
24
pa5
f5
c5
b5
e5
g5
d5 d4
g4
e4
b4
c4
f4
a4
col0
col1 a3
f3
c3
b3
e3
g3
d3 d2
g2
e2
b2
c2
f2
a2
b1
a1
f1 g1
e1 c1
d1 d0
c0
e0
g0
f0
a0
b0
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 L28 L29 L30 L31 L32
L57 L56 L55 L50 L49 L48 L47 L46 L45 L44 L43 L42 L41 L40 L39 L38 L37 L36 L35 L34 L33 LC3 LC2 LC1 LC5 LC4 L58 L60 L59
COM.
SEG. COM. SEG.
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
L28
L29
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
L5
L4
L30
x4y1
x13y1
LC2
x3y1
x9y1
x10y1
x8y1
x12y1
x28y1
x2y1
x5y1
x6y1
x7y1
x11y1
x0y1
x19y1
x29y1
x27y1
x24y1
x23y1
x20y1
x26y1
x22y1
x21y1
x25y1
x14y1
x1y1
x30y1
x9y0
LC3
x4y0
x8y0
x13y0
x3y0
x5y0
x10y0
x7y0
x12y0
x2y0
x6y0
x11y0
x0y0
x19y0
x28y0
x27y0
x24y0
x23y0
x20y0
x25y0
x29y0
x21y0
x22y0
x26y0
x1y0
x14y0
x30y0
x9y2
x5y2
x13y2
LC1
x8y2
x4y2
x10y2
x3y2
x7y2
x12y2
x2y2
x6y2
x11y2
x0y2
x19y2
x28y2
x27y2
x24y2
x23y2
x20y2
x26y2
x22y2
x25y2
x29y2
x21y2
x1y2
x14y2
x30y2
x13y4
x4y4
LC4
x9y4
x12y4
x3y4
x8y4
x5y4
x10y4
x2y4
x6y4
x7y4
x11y4
x0y4
x19y4
x28y4
x27y4
x24y4
x23y4
x20y4
x25y4
x29y4
x22y4
x21y4
x26y4
x14y4
x1y4
x30y4
x9y3
x4y3
x8y3
LC5
x3y3
x5y3
x13y3
x7y3
x2y3
x10y3
x11y3
x12y3
x6y3
x0y3
x19y3
x24y3
x23y3
x20y3
x28y3
x27y3
x21y3
x26y3
x25y3
x29y3
x22y3
x1y3
x14y3
x30y3
L55
L56
L57
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L47
L48
L49
L50
L46
L31
L32
L33
L34
L35
L58
L59
L60
LC2
x36y1
rc1
b0
g0
b1
b2
g1
g2
b3
g3
e3
b4
g4
f4
b5
x16y1
x15y1
x17y1
g5
f5
x18y1
x31y1
x32y1
x34y1
x35y1
x33y1
LC3
x36y0
a0
a1
f0
f1
a2
col1
f2
a3
f3
a4
x17y0
x15y0
x16y0
a5
p
x18y0
x31y0
x32y0
x35y0
x33y0
x34y0
LC1
x36y2
rc2
c0
e0
c1
e1
c2
e2
c3
d3
col0
c4
d4
c5
e4
x15y2
x16y2
x17y2
d5
e5
x18y2
x32y2
x31y2
x33y2
x34y2
x35y2
LC4
x36y4
w0
w1
w2
w3
w4
x15y4
x16y4
x17y4
x18y4
x32y4
x31y4
x35y4
x33y4
x34y4
LC5
x36y3
rc3
d0
d1
d2
sig
dst
24
alert
snz
alm4
alm3
alm2
x15y3
x16y3
alm1
alm0
x17y3
x18y3
x32y3
x31y3
x33y3
x34y3
x35y3
alm2

— 7 —
3-2. CIRCUIT DIAGRAM
GND VDD2
CRIN
BAT
VCH VDD3 VC1 VC2
C1
C3C8
XTB
Xtal1
L4 L60- - - - - LC1 LC5- - -
CT
LCD
LD1
CRMS
S2
S4
S3
VDD1
C2
VDD2A BD1
GNDA
C9 Z
LL1
Tr1
CRST
XT
+
T1 T2 T3 KI1 KI2 KI3 KI4 KI5 KI6 KI7 KI8 KI9 EMP
S1
PZ
VDSP
C4
VOSC
C7
VC3 VC4
C5
VHF
C6
VAN
KC5 KC4 KC3 KC2
PX1 PY1
Vref
PW1
PY3 PX3
PU1
PZ1
LE
PH
ADIN
PO
KC6 KC1
AC
T4
L2L1 ✽1✽1✽1✽1✽1✽1✽1✽1✽1✽1✽1
✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1 ✽1
A2OUT
✽1
✽4✽4
+
✽1
Creg
PON REG
AGC
VSM0 VSM1
TCOGND
HOLD
VCC
1 2 3
16 15 14
4 5 6 7 8
13 12 11 10
9
Cxt
C401
Rxt2
Ccp9
Cf12 Cagc
Cbat
Rbat
Xtal2
IC
ANT
Rant2
Cf13
Rcp
An.B
CLF1
E'
Cel
EL
INV
LL2
L+ VOUT L- GND CLF2
V+
BACK FRONT
PTINPTSCUTSCKSDOCSBSDILC6
Rxt3
Xtal3
✽2 ✽2 ✽2
✽3 ✽1 ✽3 ✽3 ✽1
S5
Ccont
C402
C403
C603
C602
C601
Rant1
Rcont
Rs
Rg
Rd
Cc
FET
L3,L51-54 ✽1
✽5
Rpd
TOTAL BONDING
(LSI TEST AC,T1-3, KI1-9, L8-39)
129 Pins 96 Pins
LSI
✽ 1. No bonding ✽2. Short (Soldering) ✽ 3. Latch type key ✽ 4. O1 and O2 are used in this module. ✽ 5. An.B is not mounted in this module.

— 8 —
Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y
3-3. CHECKING TERMINALS AND COMPONENT
KI8
GND
GND VOSC
GND
GND VHF
VDSP
VDD3
GND
GND
KI6KI7
VDD1
KI3
GND
KI5
GND
L2
L1
GND
VOUT
2
16
44
XT2
XT3
LD1GND
KI2 KI4
L-
L+
16
GND
GND
VC4
VDD2
3
XT2
7
XTB
XT
VC3
VC2
VC1 KI1
7XT3
GND
3
1
VDD2
G
D
S
GND
LD1
116
SGND
D
GND
2
D
GND
G
LD1
13
GND
12
GND
57
KC1
KC2
L2
VOUT
VCH
KI1
VC1
KC5
AC
cp
GND
KI3
VDD2
LL1
GND
9
GND
14
LL1
GND
XT
GND
VDD2
LL1
cp
VOUT
GND
V+
E'
CLF2
CLF1
L-
L+ CLF1
CLF2
8
1
9
7 3
16
5 4 2KC3
KC4
KI9
12 13 14
2S
GND
GND
VCH
VOSC
KI9
LL1
GND
GND
GND
KI2
KI5
KI1
VDD2
KI4
KI9
GND
Rxt2
Xtal2
FET
6. Oscillator/Crystal
(1002 7212)
Xtal3 7. Oscillator/Crystal
(1005 5378)
Xtal1
Resistor/Chip
Rxt3 Resistor/Chip
Rbat Resistor/Chip
Cagc Capacitor/Chip
Ccp9 Capacitor/Chip Rant2 Resistor/Chip
Creg Capacitor/Chip
Capacitor/Chip
C5
Capacitor/Chip
C2
Capacitor/Chip
C7
Capacitor/Chip
C1
Capacitor/Chip
C6
Capacitor/Chip
C3
Capacitor/Chip
Cc
Capacitor/Tantalum
C8
Capacitor/Tantalum
C9
Resistor/ Chip
Rd
Resistor/Chip Rs
Resistor/Chip Rg
Capacitor/Chip
C4
Inverter
INV
Resistor/Chip
Rcp
Capacitor/Chip
Cf13
Capacitor/Chip
Cxt
Resistor/Chip
Rpd
Capacitor/Chip
Cbat
Capacitor/
Chip
Cf12
Capacitor/Chip
Cel
IC
Transistor
4. Capacitor/Trimmer
(1001 0950)
5.
Oscillator/Crystal
(7110 1263)
CT
Coil
LL1
Transistor
Tr1 Varistor
Z
3. PCB ASS'Y
(7640 5314)

— 9 —
4. EXPLODED VIEW: QW-2510
(CR2016)
Battery Lithium
1 (1007 6096)
13 (1007 6106)
12 (1007 6104)
21 (7201 9249)
22 (1007 6100)
11 (7231 1952)
9 (1005 8521)
18 (7233 1757)
3 (7640 5314)
PCB Ass'y
15 (1007 6109)
13 (1007 6106)
2 (1007 6108)
20 (1007 6101)
14 (1007 6103)
8 (7225 2421)
16 (1007 6099)
10 (1007 6107)
17 (7233 0952)
9 (1005 8521)
19 (1007 6102)

5. PARTS LIST: QW-2510
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 Specification Applicable Q R
1007 5930 MODULE/WITHOUT MOVEMENT QW-2510YCSA-02 WV-54DA-7AV 1 A
< LCD, Cushion 2709-1, Interconnectors, Sheet/Insulation and
Holder/Antenna are not included in the module QW-2510. >
1 1007 6096 LCD C2511-01P QW-2510YCSA-02 1 A
2 1007 6108 EL YEL-2511-A-01 QW-2510YCSA-02 1 A
3 7640 5314 PCB ASS'Y Q255541*1TK QW-2510YCSA-02 1 A
4 1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P QW-2510YCSA-02 1 B
5 7110 1263 OSCILLATOR/CRYSTAL DT-26S07 QW-2510YCSA-02 1 B
6 1002 7212 OSCILLATOR/CRYSTAL C2-40.003KHZ-10/10 QW-2510YCSA-02 1 B
7 1005 5378 OSCILLATOR/CRYSTAL C2-60.003KHZ-10/10 QW-2510YCSA-02 1 B
8 7225 2421 CONTACT/BATTERY(-) Q34947C-2 QW-2510YCSA-02 1 C
9 1005 8521 CUSHION 2397-1 Q468515-1 QW-2510YCSA-02 2 C
10 1007 6107 CUSHION 2709-1 Q469338-1 QW-2510YCSA-02 1 C
11 7231 1952 HOLDER/BATTERY Q253743-1 QW-2510YCSA-02 1 C
12 1007 6104 HOLDER/HOUR WHEEL Q370808-1 QW-2510YCSA-02 1 C
13 1007 6106 INTERCONNECTOR 2511-1 Q469335-1 QW-2510YCSA-02 2 C
14 1007 6103 INTERCONNECTOR 2709-2 Q469334-1 QW-2510YCSA-02 1 C
15 1007 6109 PANEL Q370868-2 QW-2510YCSA-02 1 C
16 1007 6099 SHEET/INSULATION Q469326-1 QW-2510YCSA-02 1 C
17 7233 0952 SHEET/INSULATION 1028 Q434476-1 QW-2510YCSA-02 1 C
18 7233 1757 SHEET/INSULATION 1403 Q452985-1 QW-2510YCSA-02 1 C
19 1007 6102 SPRING/COIL 2511-1 Q469331-1 QW-2510YCSA-02 2 B
20 1007 6101 SPRING/COIL 2709-3 Q469330-1 QW-2510YCSA-02 1 B
21 7201 9249 SPRING/COIL 675-3 Q413389A-1 QW-2510YCSA-02 1 B
22 1007 6100 HOLDER/ANTENNA Q469327-1 QW-2510YCSA-02 1 C
BATTERY/LITHIUM CR2016 QW-2510YCSA-02 1
For the prices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-580.
Notes: Q - Used quantity
R - Rank — 10 —

— 11 —
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 D button, press Band Cbuttons at the normal time keeping 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.
6. PRECAUTIONS FOR REPAIR: QW-2510
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 arrows.
QW-2510
Metallic tweezers

CASIO TECHNO CO.,LTD.
Overseas Service Division
Nishi-Shinjuku Kimuraya Bldg. 1F
5-25, Nishi-Shinjuku 7-Chome
Shinjuku-ku, Tokyo 160-0023, Japan