Casio QW-2812 Troubleshooting guide

SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-2812
MODULE NO.
R
REF. NO. S/M-848
FEB. 2004
WVH-500D
Ver.1 : Apr. 2004

CONTENTS
Page
1. SPECIFICATIONS: MODULE QW-2812 .................................................... 1
2. OPERATION CHART: MODULE QW-2812 ............................................... 2
3. DRAWINGS: MODULE QW-2812
3-1. LCD DIAGRAM ............................................................................................. 7
3-2. CIRCUIT DIAGRAM ...................................................................................... 8
3-3. CHECKING TERMINALS AND COMPONENTS ..........................................9
4. EXPLODED VIEW: MODULE QW-2812 ................................................... 10
5. PARTS LIST: MODULE QW-2812 ............................................................ 11
6. PRECAUTIONS FOR REPAIR: MODULE QW-2812
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE .....................................12
6-2. ACCURACY CHECKING ............................................................................. 12
6-3. SOLAR CELL-PCB ASS'Y CONTACT CHECKING....................................13
7. TROUBLESHOOTING: MODULE QW-2812.............................................14

— 1 —
1. SPECIFICATIONS: MODULE QW-2812
Battery CTL1616 (Storage battery)
Note: Use CTL1616 only. Other storage battery or CR1616 can cause
damage to the watch.
Battery life Approx. 7 months (from full charged condition)
Current consumption 1.273 µA maximum
Alarm system Piezo plate on Cover/Back
Accuracy ±15 sec./month
Accuracy setting system Trimmer capacitor
Accuracy checking See page 12
Functions • Electro-luminescent backlight
Afterglow
• Solar powered
• Time calibration signal reception
Auto receive
Manual receive
Last date/time received display
• Time Calibration Signal
Receivable Time Calibration Signals
Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5kHz)
• e-DATE MEMORY
Meomory capacity: Up to 40 records for Internet access codes and other
data (when there are 7characters per record), actual number of records
depends on the number of characters per record
• World Time
29 time zones (30 cities), daylight saving time on/off
• 1/100-sec. stopwatch
Measuring capacity: 99’59.99"
Measuring modes: Elapsed time, split time, 1st-2nd place times
• Daily alarms
3 independent daily alarms
• Hourly time signal
• Low battery warning display
• Auto-calendar (to year 2039)
• 12/24-hour format
• Regular timekeeping:
Digital: Hr, min, sec, am/pm, month, date, day
Item Detail

— 2 —
2. OPERATION CHART: MODULE QW-2812
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to carefully read this manual and keep it on hand for later reference
when necessary.
Expose the watch to bright light to charge its battery before using it.
You can use this watch even as its battery is being charged by exposure to bright
light.
•Be sure to read “Battery” of this manual for important information you need to
know when exposing the watch to bright light.
If the display of the watch is blank...
If the Power Saving indicator (PS) is on the display (either
flashing or steady), it means that the display is blank
because the watch’s Power Saving function has turned it
off to conserve power. Power Saving automatically turns
off the display and enters a sleep state whenever your
watch is left for a certain period in an area where it is
dark.
• The initial factory default setting is Power Saving on.
• The watch will recover from the sleep state if you move it
to a well-lit area or if you press any button.
• See “Power Saving Function”for more information.
Power saving indicator
About This Manual
• 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.
General Guide
• Press Cto change from mode to mode.
• In any mode, press Bto illuminate the display.
Alarm Mode
Data Memory ModeStopwatch Mode
Timekeeping Mode Press C.
World Time Mode
▲
▲
▲
▲
▲
Radio-controlled Timekeeping
This watch receives a time calibration signal and updates
its time setting accordingly. The time calibration signal
includes both Standard Time and Daylight Saving Time
(summer time) data.
• This watch is designed to pick up the time calibration
signal transmitted from Mainflingen, Germany.
DST indicator
Hour : Minutes
Seconds
PM indicator
Day of week
Month –Day
Current Time Setting
This watch automatically adjusts its time setting in accordance with a time calibration
signal. You can also perform a manual procedure to set the time and date, when
necessary.
• The first thing you should do after purchasing this watch is to set your Home City,
which is the city where you will normally use the watch. For more information, see
“To set your Home City”below.
• When using the watch in an area that is outside of the range of the transmitter in
Mainflingen, you need to manually adjust the time as required. See “Timekeeping”
for information about manual settings.
To set your Home City
1. In the Timekeeping Mode, hold down Auntil the city
code starts to flash, which indicates the setting screen.
2. Use D(east) and B(west) to select the city code you
want to use as your Home City.
• The following are the city codes for major cities in the
Western Europe time zones.
LON : London
PAR and BER : Paris, Berlin, Milan, Rome,
Amsterdam, Hamburg, Frankfurt,
Vienna
3. Press Atwice to exit the setting screen.
• The first press of Adisplays the 12/24-hour setting screen. Pressing Aagain exits
the setting screen.
• Normally, your watch should show the correct time as soon as you select your Home
City code. If it does not, it should adjust automatically after the next auto receive (in
the middle of the night). You can also perform manual receive or you can set the time
manually.
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City code
• If you are in an area that does not use Daylight Saving Time (summer time), turn off
the DST setting.
To display the last signal screen
In the Timekeeping Mode, press Dto display the last signal screen (indicated by
GET ). The last signal screen shows the date and time of the last successful time
calibration signal reception.
Press D.
PM indicator
DST indicator Hour : Minutes
Seconds
Day of week Month –Day
Received time
(Hour : Minutes)
Received date (Month –Day)
Last Signal Screen
▲ ▲
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
• Auto Receive
With auto receive, the watch automatically picks up the time calibration signal five
times a day at 0:00 a.m., 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. For more
information, see “About Auto Receive”.
• Manual Receive
Manual receive lets you start time calibration signal reception with the press of a
button. For more information, see “To perform manual receive”.
Important!
• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o’clock side facing towards a window.
Make sure there are no metal objects nearby.
• The watch should not be on its side or facing the wrong way.
Resin Band Metal Band
Inside or
among
buildings
Inside a
vehicle Near household
appliances,
office
equipment,
or a mobile
phone
Near a
construction
site, airport, or
other sources
of electrical
noise
Near high-
tension
power lines
Among or
behind
mountains
• Proper signal reception can be difficult or even impossible under the conditions listed
below.

— 3 —
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to seven minutes. Take care that
you do not perform any button operations or move the watch during this time.
• This watch is designed to receive the time calibration signal transmitted from
Mainflingen, Germany. Signal reception is possible within the area represented by a
circle with a radius of about 1,000 kilometers.
• At distances further than about 500 kilometers from a transmitter, signal reception
may not be possible during certain times of year or times of day. Radio interference
may also cause problems with reception.
Mainflingen
1,000 kilometers
500 kilometers
• See the information under “Signal Reception Troubleshooting”if you experience
problems with time calibration signal reception.
About Auto Receive
When auto receive is turned on, the watch automatically starts to receive the time
calibration signal when the time in the Timekeeping Mode reaches 0:00 a.m., 1:00
a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. each day (calibration times). The watch will
also perform an additional auto receive at 5:00 a.m. if none of the regularly scheduled
auto receive are successful.
Note
• Auto receive is performed only if the watch is in the Timekeeping Mode or World
Time Mode when one of the calibration times is reached. It is not performed if a
calibration time is reached while an alarm is sounding, or while you are configuring
settings (while settings are flashing on the display).
• Auto receipt of the calibration signal is designed to be performed early in the
morning, while you sleep (provided that the Timekeeping Mode time is set correctly).
Before going to bed for the night, remove the watch from your wrist, and put it in a
location where it can easily receive the signal.
• When auto receive is turned on, the watch receives the calibration signal for two to
seven minutes everyday when the time in the Timekeeping Mode reaches each of
the five calibration times. Do not perform any button operation within seven minutes
before or after any of the five 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 reception will be performed whenever the display shows
one of the five calibration times, regardless of whether or not the Timekeeping Mode
time is actually the correct time.
• When two, three, four, or five receptions are successful, the watch uses the data of
the last reception for calibration. When only one reception is successful, the watch
uses the data of the successful reception.
About the Receiving Indicator
The receiving indicator shows the strength of the calibration signal being received. For
best reception, be sure to keep the watch in a location where signal strength is
strongest.
• Even in an area where signal strength is strong, it takes about 10 seconds for signal
reception to stabilize enough for the receiving indicator to indicate signal strength.
• Use the receiving indicator as a guide for checking signal strength and for finding the
best location for the watch during signal reception.
Weak Strong
(Level 1) (Level 4)
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Receiving indicator
• The Level 4 receiving indicator remains on the display in all modes following
reception of the time calibration signal and calibration of the watch’s time setting.
The Level 4 receiving indicator is not displayed if signal reception was unsuccessful
or after manual adjustment of the current time setting.
• The Level 4 receiving indicator indicates that at least one of the five calibration
signal reception was successful. Note, however, that the Level 4 receiving indicator
is cleared from the display at 3:00 a.m. each day.
To perform manual receive
1.Place the watch on a stable surface so its top (12
o’clock side) is facing towards a window.
2.In the Timekeeping Mode, hold down Dfor about two
seconds until the watch beeps.
3.Release Dand RC! flashes to indicate that signal
reception has started.
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Receiving indicator
• Time calibration signal reception normally takes from two to seven minutes.Take
care that you do not perform any button operations or move the watch during this
time.
• After signal reception is complete, the display of the watch changes to the last signal
screen.
Note
• To interrupt a reception and return to the Timekeeping Mode, press D.
• If the reception is unsuccessful, the message ERR appears on the display for about
one or two minutes. After that, the watch returns to the Timekeeping Mode.
• You can also change from the last signal or ERR screen to the normal timekeeping
screen by pressing D.
To turn auto receive on and off
1.In the Timekeeping Mode, hold down Auntil the city
code starts to flash, which indicates the setting screen.
2.Press Ctwice to move the flashing to the auto receive
on/off setting.
3.Press Dto toggle auto receive on (On) and off (OFF).
• If the current Home City setting is a city code that
does not support auto receive, “xx”appears in place
of the on/off indicator. This means you cannot turn
auto receive on or off.
4.Press Atwice to exit the setting screen.
• For information about city codes that support signal
reception, see “To set your Home City”.
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On/Off status
Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal reception.
Problem
Cannot
perform
manual
receive.
Auto
receive is
turned on,
but the
Level 4
receiving
indicator
does not
appear on
the display.
Time
setting is
incorrect
following
signal
reception.
Probable Cause
• The watch is not in the Timekeeping
Mode.
• Your current Home City is not one of
the following city codes: BER, PAR,
or LON.
• 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 auto receive.
• Even if reception is successful, the
Level 4 receiving indicator disappears
every day at 3 a.m.
• Time data (hour, minutes, seconds)
only was received during the last
reception. The Level 4 receiving
indicator appears only when time
data and date data (year, month, day)
are both received.
• If the time is one hour off, the DST
setting may be incorrect.
• The Home City code setting is not
correct for the area where you are
using the watch.
What you should do
• Enter the Timekeeping Mode and try
again.
• Select BER, PAR, or LON as your
Home City.
• Perform manual receive or wait until
the next auto receive is performed.
• Check to make sure the watch is in a
location where it can receive the
signal.
• Change the DST setting toAuto DST.
• Select the correct Home City code.
• For further information, see “Important!”under “Time Calibration Signal Reception”
and “Radio-controlled Timekeeping Precautions”.
World Time
World Time shows the current time in 30 cities (29 time
zones) around the world.
• If the current time shown for a city is wrong, check your
Home City time settings and make the necessary
changes.
• The watch will perform a signal reception 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 time.
• 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
Timekeeping
Mode time
To view the time in another city
While in the World Time Mode, press Dto scroll through the city codes (time zones).
• For full information on city codes, see the “City Code Table”.
To toggle a city code time between Standard Time and Daylight Saving Time
1.In the World Time Mode, use Dto display the city code
(time zone) whose Standard Time/Daylight Saving Time
setting you want to change.
2.Hold down Ato toggle Daylight Saving Time (DST
displayed) and Standard Time (DST not displayed).
• Note that you cannot switch between Standard Time
and Daylight Saving Time while GMT is selected as the
city code.
• The DST indicator will appear 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.
DST indicator
Alarms
You can set three independent Daily Alarms. When an
alarm is turned on, the alarm tone sounds 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.
• The alarm number (AL1 though AL3) indicates an alarm
screen. SIG appears in place of the alarm number when
the Hourly Time Signal screen is shown.
• All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
Alarm number
Alarm time
(Hour : Minutes)
Timekeeping
Mode time
To set an alarm time
1.In the Alarm Mode, press Dto select the alarm whose
time you want to set.
AL1 AL2 AL3 SIG
2.Hold down Auntil the hour setting of the alarm time
starts to flash, which indicates the setting screen.
• This automatically turns on the alarm.
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Alarm on
indicator
Hourly time signal
on indicator

— 4 —
3. Press Cto move the flashing between the hour and minute settings.
4. While a setting is flashing, use D(+) and B(–) to change it.
• When setting the alarm time using the 12-hour format, take care to set the time
correctly as a.m. (Aindicator) or p.m. (Pindicator).
5. Press A to exit the setting screen.
Alarm Operation
The alarm sounds in all modes at the preset time for about 10 seconds, or until you
stop it by pressing any button.
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, press Dto select an alarm or the Hourly Time Signal.
2. When the alarm or the Hourly Time Signal you want to set is selected, press Ato
turn it on and off.
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.
Timekeeping
Mode time
Text
Record number
To create a new data memory 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 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.
3.Use Band Dto cycle through characters at the
current cursor location, and Cto move the cursor to
the right. See “Inputting Text”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.
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Cursor
4.Press Ato store your data and return to the data
memory record screen (without the cursor).
• The message SET appears for about two seconds,
followed by a data memory record screen, which shows
the text you just input, along with a record number
automatically assigned by the watch.
Timekeeping
Mode time
Text Record number
To recall data memory records
1. In the Data Memory Mode, press Dto scroll forward through data memory records.
• Each press of Dadvances to the next record and shows its record number and
first three characters of its text.
• Pressing Dwhile the last record in memory is on the display changes to the
remaining memory screen. Pressing Dagain displays the first record.
2. Use Ato scroll through the text, three characters at a time.
• An end mark indicates the end of the text.
First three characters Second three characters End mark
Each press of Ashows the next three characters.
▲ ▲
To edit a data memory record
1. In the Data Memory Mode, display the record you want to edit.
2. Hold down Auntil the flashing cursor appears on the display.
3. Press Cto move the flashing to the character you want to change.
4. Use Dand Bto change the character.
5. After making the changes you want, press Ato 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. Hold down A until 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.
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
• The display range of the stopwatch is 99 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.
Timekeeping
Mode time
Minutes 1/100 second
Seconds
D
Start Stop
Elapsed Time
➤ Re-start Clear
D
➤ Stop
D
➤
D
➤
A
Split Time
D
Start Split
(,flashes)
➤ 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.
To measure times with the stopwatch
Illumination
The watch has an EL (electro-luminescent) panel that
causes the entire display to glow for easy reading in the
dark.
• See “Illumination Precautions”for other important
information.
To turn on illumination
Press Bin any mode to illuminate the display.
• You can specify 1.5 seconds or 2.5 seconds as the
illumination duration. See “To set the current time and
date manually”for more information.
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.
• The illustration shows how to position
a watch with a resin band.
• Note that charging efficiency drops
when any part of the solar cell is
blocked by clothing, etc.
• Normally, you should try to keep the
watch outside of your sleeve as much
as possible. Charging is significantly
reduced if the face is only partially
covered.
Solar cell
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. Make sure that the watch is normally exposed to bright light
wheneverpossible.
• 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 it 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.
Function Status
All functions enabled.
All functions enabled.
Auto and manual receive,
alarm, hourly time signal,
illumination, and display are
disabled.
All functions, including
timekeeping, disabled.
Battery Power Indicator and Recover Indicator
The battery power indicator on the display shows you the current status of the
rechargeable battery’s power.
Level
1
2
3
4
Battery Power
Indicator
(Charge Soon Alert)
Battery indicator
Recover indicator
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—5 —
• The flashing charge indicator (CHG) at Level 3 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 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 higher than the actual
battery level. The correct battery power indicator should appear after a few minutes.
• If you use the light or alarms a number of times during a short period, the
RECOVER indicator appears on the display and the following operations become
disabled until battery power recovers.
Illumination
Beeper tone
Time calibration signal reception
After some time, battery power will recover and the RECOVER indicator 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
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Day
(5,000 lux)
Indoor Fluorescent Lighting (500 lux)
Approximate Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
• Since these are the specs, we can include all the technical details.
• Display on 18 hours per day, sleep state 6 hours per day
• 1 illumination operation (1.5 seconds) per day
• 10 seconds of alarm operation per day
• 5 times calibration reception per day
• Stable operation is promoted by frequent charging.
Charging Guide
After a full charge, timekeeping remains enabled for up to about 7 months.
• The following table shows the amount of time the watch needs to be exposed to light
each day in order to generate enough power for normal daily operations.
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
12 hours
60 hours
6 hours
28 hours
–––
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window
(10,000 lux)
Daylight Through a Window
on a Cloudy Day (5,000 lux)
Indoor Fluorescent Lighting
(500 lux)
Approximate Exposure Time
Level 4 Level 3 Level 2 Level 1
▲ ▲ ▲
1 hour
5 hours
10 hours
94 hours
▲
Exposure Level
(Brightness)
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
–––
Timekeeping
Use the Timekeeping Mode to set and view the current time and date. This section
also explains how to manually set the current date and time.
• When setting the time, you can also configure settings for the illumination duration,
the 12/24-hour format, and power saving on/off.
• All of the operations in this section are performed in the Timekeeping Mode, which
you can enter by pressing C.
Press D.
PM indicator
DST indicator Hour : Minutes
Seconds
Day of week Month –Day
Received time
(Hour : Minutes)
Received date
(Month –Day)
Last Signal Screen
▲ ▲
Setting the Time and Date Manually
Make sure you select your Home City code before you change the current time and
date settings. World Time Mode times are all displayed in accordance with the
Timekeeping Mode settings. Because of this, World Time Mode times will not be
correct if you do not select the proper Home City code before setting the time and
date in the Timekeeping Mode.
To set the current time and date manually
1.In the Timekeeping Mode, hold down Auntil the city
code starts to flash, which indicates the setting screen.
2.Use Aor Cto move the flashing in the sequence
shown below to select other settings.
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City code
Seconds Hour Minutes
12/24-Hour
Format
Day Month Year
/ Press A.
Press
C .
Power
Saving
C
A
Auto
Receive
DSTCity Code
C
Transmitter/
City Settings
Time/Date
Settings
Screen: To do this:
Change the city code
Toggle between Daylight Saving
Time (
ON ) , Standard Time ( OFF ),
or Auto DST ( A )
Toggle between auto receive on
(
On ) and off ( OFF )
Do this:
Use D(east) and B(west).
Press D.
Press D.
3. When the setting you want to change is flashing, use Band/or Dto change it as
described below.
Transmitter/City Settings
• See “City Code Table”for a complete list of available city codes.
Screen: To do this:
Toggle between 12-hour ( 12H ) and
24-hour ( 24H ) timekeeping
Reset the seconds to 00
Toggle the illumination duration
setting between 1.5 seconds ( )
and 2.5 seconds ( )
Change the hour or minutes
Change the month, day or year
Toggle Power Saving on (
On ) and
off (
OFF )
Do this:
Press D.
Press D.
Press B.
Use D(+) and B(–).
Use D(+) and B(–).
Press D.
Time/Date Settings
• For information about settings other than the time and date, see the following.
Illumination duration: Illumination
Power Saving: Power Saving Function
4. Use Ato exit the setting screen.
• If a Transmitter/City Setting screen is displayed, press Atwice.
• If a Time/Date Setting screen is displayed, press Aonce.
Note
• Auto DST (
A ) can be selected only while BER , PAR , LON , or ATH is selected
as the Home City code. For more information, see “Daylight Saving Time (DST)”
below.
• The auto receive setting is used for time calibration signal reception only. See “About
Auto Receive”for details.
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
The time calibration signal transmitted from Mainflingen includes both Standard Time
and DST data. When theAuto DST setting is turned on, the watch switches between
Standard Time and DST(summer time) automatically in accordance with the
Mainflingen signal.
• The default DST setting isAuto DST (
A ) 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 Daylight Saving Time (summer
time) manually.
To change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down Auntil the city code starts to flash, which
indicates the setting screen.
2. Press Conce to display the DST setting screen.
3. Use Dto cycle through the DST settings in the sequence shown below.
4. When the setting you want is selected, press Atwice to exit the setting screen.
• The DST indicator appears on the display to indicate that Daylight Saving Time is
turned on.
Auto DST (
A
) DST on (
ON
)DST off (
OFF
)
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.
Power Saving Function
When turned on, the Power Saving function automatically enters a sleep state
whenever the watch is left for a certain period in an area where it is dark. 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
Display
Blank, with
PS flashing
Blank, with
PS not flashing
Operation
Display is off, but all functions are enabled.
All functions are disabled, but timekeeping
is maintained.
• Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
• The watch will not enter the sleep state while the Timekeeping Mode time is
between 6:00 AM and 9:59 PM. If the watch is already in the sleep state when the
time reaches 6:00 AM, however, it will remain in the sleep state.
• The watch will not enter the sleep state while it is in the Stopwatch Mode.

—6 —
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area. It can take up to two seconds for the display to turn
on.
• Press any button.
To turn Power Saving on and off
1.In the Timekeeping Mode, hold down Auntil the city
code starts to flash, which indicates the setting screen.
2.Press Aagain.
3.Press Cseven times until the Power Saving on/off
screen appears.
4.Press Dto toggle Power Saving on (On) and off (OFF).
5.Press Ato exit the setting screen.
• The Power Saving indicator (PS) is on the display in all
modes while the Power Saving is turned on.
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 returns to the Timekeeping Mode.
• If you leave the watch with a flashing setting or cursor on the display for two or three
minutes without performing any operation, the watch automatically exits the setting
screen.
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Power saving
indicator On/Off status
Scrolling
The Band Dbuttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a scroll
operation scrolls through the data at high speed.
Initial Screens
When you enter the World Time, Alarm, or Data Memory Mode, the data you were
viewing when you last exited the mode appears first.
Radio-controlled Timekeeping Precautions
• Strong electrostatic charge can result in the wrong time being set.
• Even when the watch is within the reception range of the transmitter, signal
reception will be 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 bounces off the ionosphere. Because of this, such factors
as changes in the reflectivity of the ionosphere, as well as movement of the
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of
day may change the reception range of the signal and make reception temporarily
impossible.
• Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• The watch is designed to automatically update the date and day of the week for the
period January 1, 2000 to December 31, 2099. Setting of the date by the time
calibration signal cannot be performed starting from January 1, 2100.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.
• Normally, the signal reception date shown by the last signal screen is the date data
included in the received time calibration signal. When only time data is received,
however, the last signal screen shows the date as kept in the Timekeeping Mode at
the time of signal reception.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within ±15 seconds a month at normal temperature.
• If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your current city code, DST (summer
time), and auto receive settings. The following are the initial factory defaults for these
settings.
Setting
City code
DST (summer time)
Auto receive
Initial Factory Default
(Berlin)
(Auto switching)
(Auto receive)
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 day of the week is automatically displayed in accordance with the date (year,
month, and day) settings.
• The year can be set in the range of 2000 to 2099.
• The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to change
it except after you have the watch’s battery replaced or when battery power drops to
Level 4.
• The current time for all city codes in the Timekeeping Mode and World Time Mode is
calculated in accordance with the Greenwich Mean Time (GMT) differential for each
city, based on your Home City time setting.
• GMT differential is calculated by this watch based on UniversalTime Coordinated
(UTC*) data.
* UTC is the world-wide scientific standard of timekeeping. It is based upon carefully
maintained atomic (cesium) clocks that keep time accurately 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.
To input characters
1.When the cursor is on the display, use Band Dto
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.
a to z
(lower-case)
(space)
*
to +
(symbol)
0 to 9
(number)
A to Z
(upper-case)
Data Memory
Input Screen
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Cursor
• See the “Character List”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.
Illumination 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.
• Illumination automatically turns off whenever an alarm sounds.
• 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.
• Frequent use of illumination runs down the battery.
Honolulu
Anchorage
Los Angeles
Denver
Chicago
NewYork
Caracas
Rio De Janeiro
London
Paris
Berlin
City City GMT Other major cities in same time zone
Code Differential
City Code Table
–––
HNL
ANC
LAX
DEN
CHI
NYC
CCS
RIO
–––
–––
GMT
LON
PAR
BER
–11.0
–10.0
–09.0
–08.0
–07.0
–06.0
–05.0
–04.0
–03.0
–02.0
–01.0
+00.0
+01.0
PagoPago
Papeete
Nome
San Francisco, Las Vegas, Vancouver,
Seattle/Tacoma, Dawson City
El Paso, Edmonton
Houston, Dallas/Ft. Worth,
New Orleans, Mexico City, Winnipeg
Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
La Paz, Santiago, Pt. Of Spain
Sao Paulo, Buenos Aires, Brasilia, Montevideo
Praia
Dublin, Lisbon, Casablanca, Dakar,Abidjan
Milan, Rome, Amsterdam,Algiers, Hamburg, Frankfurt,
Vienna, Stockholm
Athens
Cairo
Jerusalem
Jeddah
Tehran
Dubai
Kabul
Karachi
Delhi
Dhaka
Yangon
Bangkok
Hong Kong
Seoul
Tokyo
Adelaide
Sydney
Noumea
Wellington
+02.0
+03.0
+03.5
+04.0
+04.5
+05.0
+05.5
+06.0
+06.5
+07.0
+08.0
+09.0
+09.5
+10.0
+11.0
+12.0
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
Pt. Vila
Christchurch, Nadi, Nauru Is.
ATH
CAI
JRS
JED
THR
DXB
KBL
KHI
DEL
DAC
RGN
BKK
HKG
SEL
TYO
ADL
SYD
NOU
WLG
• Based on data as of June 2003.
(space)
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
*
–
–
@
~
/
?
#
!
%
.
:
,
,
&
=
a
b
c
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
*
-
_
@
/
#
!
%
.
:
'
'
&
=
X
Character List
d
–
+
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9
-
+
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9
Inputting Text
The following describes how to input text in the Data Memory Mode.
PressD. Press B.

—7 —
3. DRAWINGS: MODULE QW-2812
3-1. LCD DIAGRAM
SEG. COM. SEG. COM.
LC1 LC2 LC3 LC4 LC5 LC1 LC2 LC3 LC4 LC5
SEG. COM.
L28
L29 PS
CHG
L30
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
P1
e3
d3
c3
e2
d2
c2
HYP
c0
d0
e0
c1
d1
e1
DST1
REC
A1
f3
g3
b3
f2
g2
b2
COL1
d4
b0
g0
f0
b1
g1
f1
HI
MID
RC2
d9
c9
a3
d8
c8
a2
d7
c7
e6
c4
e4
a0
d5
e5
a1
d6
RC1
RC0
e9
g9
b9
e8
g8
b8
e7
g7
b7
f6
a4
f4
b5
a5
f5
c6
g6
P0
f9
a9
f8
a8
COL0
f7
a7
AL
SIG
b4
g4
c5
g5
b6
a6
A0
DST0
L22
L23
L24
L25
L26
L27
L31
L32
L33
L34
L35
L36
L37
L38
L39
X14Y0
X13Y0
X12Y0
X11Y0
X10Y0
X9Y0
X0Y0
X1Y0
X2Y0
X3Y0
X4Y0
X5Y0
X6Y0
X7Y0
X8Y0
X14Y1
X13Y1
X12Y1
X11Y1
X10Y1
X9Y1
X0Y1
X1Y1
X2Y1
X3Y1
X4Y1
X5Y1
X6Y1
X7Y1
X8Y1
X14Y2
X13Y2
X12Y2
X11Y2
X10Y2
X9Y2
X0Y2
X1Y2
X2Y2
X3Y2
X4Y2
X5Y2
X6Y2
X7Y2
X8Y2
X14Y3
X13Y3
X12Y3
X11Y3
X10Y3
X9Y3
X0Y3
X1Y3
X2Y3
X3Y3
X4Y3
X5Y3
X6Y3
X7Y3
X8Y3
X14Y4
X13Y4
X12Y4
X11Y4
X10Y4
X9Y4
X0Y4
X1Y4
X2Y4
X3Y4
X4Y4
X5Y4
X6Y4
X7Y4
X8Y4
LC2 LC1 L38
L3 L4 L5 L6 L7 L8 L9
L10 L11 L12 L13 L14 L15 L16 L17 L18 L19 L20 L21 L22 L23 L24 L25 L26 L27 L39 L37 L36 L35 L34 L33 L32 L31 L28 L29 L30 LC4 LC5 LC3
DST0
A1
MID
CHG
X14
X0
Y4
Y0
DST1
REC
AL
SIG
COL1
HYP
P0
A0
b9
c9
d9
e9
g9
f9
a9
b8
c8
d8
e8
g8
f8
a8
PS
c0
d0
e0
g0
f0
b0
a0
a6
f6
g6
e6 c6
b6
b5
c5
d5
e5
g5
f5 b4
c4
d4
e4
g4
f4
a4
b3
c3
d3
e3
g3
f3
a3
b2
c2
d2
e2
g2
f2
a2
b1
c1
d1
e1
g1
f1
a1
b7
c7
d7
e7
g7
f7
a7
d6
COL0
a5
P1
RC0
RC1
RC2
HI

—8 —
3-2. CIRCUIT DIAGRAM
✽ 1. No bonding
✽ 2. GND-Kl5: Open (No Soldering)
GND-Kl6: Open (No Soldering)
GND-Kl7: Open (No Soldering)
GND-Kl8: Short (Soldering)
✽ 3. Latch type key
✽ 4. Short (Soldering) (R trimming)
✽ 5. Short (Soldering) (N trimming)
✽ 6.
GNDB is used for the bias on the back of the tip.
✽ 7.
L28~L30 are used as the static drive pins.
✽ 8. Motor drive pins (01, 02) are used
in this module.
✽ 9.
Normal High
✽ 10.
LD2 (Normal Low) is used in this module.
✽ 11.
LD3 (Normal High) is used in this module.
✽ 12. Cc, Crl1, Crl2, Crl3, Rxt3 and Xtal3 are
not used in this module.
LSI
TOTAL 106PINS
BONDING 81PINS
GND VDD2
BAT
VCH VDD3 VC1 VC2
C3
C2C5
XTB
Xtal
L3 - - - - - L38 LC1 - - - LC5
LCD ( 2.8V 1/3b 1/5d )
LD1
S1
VDD1
C1
BD
C8
LL1
Tr1
XT
T1
T2
T3
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KI8
KI9
S2
SCR
SCIN
RP1RP2
Cp
PZ
VDSP
C4
VC3 VC4
Di1
VHF
C6
AC
T4
KC4
KC3
KC2
KC1
R1
R2
VSC
C7
SC
C9
R3
Z
VPM
Di2 R1
Rb
GNDB
S3
S4
SDO SCK CSBSDI
N1
N2
Cxt
Rxt2
Ccp
Cbat
Rbat
Xtal2
ISB
ANT
Rcp
Rxt3
Xtal3
L39 - - - L55
L1 L2
Cc
FET-S
GND4 Asel Pon P3-2 Hold P14
FET-D
P1
P2
GND3 GND2 P3-1 P4 P5 GND5
P12
P13
GND1
TCO
VCC
P9
P7
Crh1
Crh2
Crh3
Crl1
Crl2
Crl3
CLF1
E'
Cel
EL
INV
LL2
L+
VOUT
L-
GND CLF2
V+
BACK
FRONT
CT
✽1
✽1
✽10
✽1
✽11
✽1
✽11
✽2
✽2
✽2
✽2
✽3
✽3
✽3
✽3
✽3
✽3
✽9
✽3
✽3
✽5
✽4
✽4
✽4
✽5
✽3
✽6
✽1✽1✽1
✽1
✽7
✽8
✽1✽8
✽1
✽12
✽12
✽12
✽12
✽12
✽12

—9 —
3-3. CHECKING TERMINALS AND COMPONENTS
Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y
L+
L–
GND
VOUT
VSC
VDD2
R1 BD
VC1 VC2
KI2
KI4
KI1
P9
Ccp
R1
GNDR2
GND
R3
GND
Vcc
Ccp
P4
P7
P5 P5
X2 X3
P7
X2
SCIN
GND
X3
VDD2
FET-D
GND
VDD2
LL1
R1
GND
GND CLF2
CLF1
L+
L–
CLF2 VDD2 LD1
GND
XT
LL1
VSC
GND
VCH
VC4
VC3
VHF
VOUT
VDD3
VDSP GND
VDD1 GND
VDD2
XT
GND
XTB
R1 GND
LL1
VSC
LL1
GND
KI7
GND N2
GND
GND
KI6
N1
GND
SCIN
GND
SCR
SCIN
GND
GND
GNDB
VDD2
GND
KI8
Vcc
P2
GND
GND
VDD2
GND
CLF1
KI3 KI3
VOUT
R2
LD1
VSC
R3
KI9
KI2
KI3
VDSP SD0
VC1
P14
VCH
R1 GND
P2
P1
VDD2
KI1
KI4
FET-S
AC
KC1
Transistor
Tr1
Inverter
INV
Resistor/Chip
RP1
Resistor/Chip
RP2
Coil
LL2
Coil
LL1
Capacitor/Chip
Cel
Xtal1
4. Oscillator/Crystal
(7110 6336)
Xtal2
Oscillator/Crystal
Resistor/Chip
Rxt2
Varistor
Z
Resistor/Chip
R1
Capacitor/Chip
C8
Capacitor/Chip
C9
Capacitor/Chip
C1
Capacitor/Chip
C2
Capacitor/Chip
C6
Capacitor/Chip
Cp Resistor/Chip
Rb
Capacitor/Chip
Ccp
IC
ISB
Capacitor/Chip
Cxt
Resistor/Chip
Rcp
Resistor/Chip
Rbat
Capacitor/Chip
Cbat
Capacitor/Chip
C4
Capacitor/Chip
C3
Capacitor/Chip
C7
Capacitor/Chip
C5
Capacitor/Trimmer
CT
3. PCB ASS'Y
(7640 7379)
Diode
Di1
Diode
Di2

—10 —
4. EXPLODED VIEW: MODULE QW-2812
1 (1013 0239)
3 (7640 7379)
PCB ass'y
10 (1014 2487)
19 (1008 2129)
9 (1013 5138)
13 (7207 8349)
14 (7207 8470)
16 (1013 5139)
20 (1013 5135)
17 (1013 5134)
12 (7228 0364)
15 (1013 4221)
11 (1014 0782)
14 (7207 8470)
14 (7207 8470)
5 (1006 5657)
Battery Storage (CTL1616)
2 (1013 5055)
21 (1013 5136)
8 (1013 5052)
18 (1000 3815)
7 (1008 2184)
6 (1009 7687)

5. PARTS LIST: MODULE QW-2812
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 basi
s
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
MODULE/WITHOUT MOVEMENT QW-2812YC-01 WVH-500D-7A
< The module QW-2812 is "built-in t
yp
e" which is assembled directl
y
to
the case, therefore the module as the s
p
are
p
arts is not available. >
1 1013 0239 LCD S2815-01THP QW-2812YC-01 1A
2 1013 5055 EL YEL-2815-A-00 QW-2812YC-01 1A
3 7640 7379 PCB ASS'Y RJQ517221*001V01TK QW-2812YC-01 1A
4 7110 6336 OSCILLATOR/CRYSTAL CFS-145LM07 QW-2812YC-01 1B
5 1006 5657 BATTERY/STORAGE CTL1616 QW-2812YC-01 1B
6 1009 7687 CUSHION 2549 Q470646-1 QW-2812YC-01 1C
7 1008 2184 CUSHION 2709-2 Q469841-1 QW-2812YC-01 1C
8 1013 5052 CUSHION 2815 RJQ515128-001V01 QW-2812YC-01 1C
9 1013 5138 HOLDER RJQ514979-001V01 QW-2812YC-01 1C
10 1014 2487 INTERCONNECTOR RJQ517008-001V01 QW-2812YC-01 1C
11 1014 0782 LABEL RJQ517198-001V02 QW-2812YC-01 1C
12 7228 0364 POLE Q421168A-1 QW-2812YC-01 1C
13 7207 8349 SCREW 13 Q47608A-1 QW-2812YC-01 1B
14 7207 8470 SCREW 465 Q48694B-1 QW-2812YC-01 4C
15 1013 4221 SHEET/INSULATION RJQ515739-001V01 QW-2812YC-01 1C
16 1013 5139 SHEET/INSULATION RJQ515079-001V01 QW-2812YC-01 1C
17 1013 5134 SPACER RJQ514651-001V02 QW-2812YC-01 1C
18 1000 3815 SPRING/COIL 1910-1 Q465481-1 QW-2812YC-01 2B
19 1008 2129 SPRING/COIL 2512-2 Q469640-1 QW-2812YC-01 2B
20 1013 5135 SUPPORTER/PCB ASS'Y RJQ514652-001V03 QW-2812YC-01 1C
21 1013 5136 TERMINAL/BATTERY
(
+
)
RJQ514658-001V02 QW-2812YC-01 1C
For the
p
rices and minimum order/su
pp
l
y
q
uantities of the above
p
arts, refer to the Parts Price List P.P.L.-603.
Notes: Q - Used quantity
R - Rank — 11 —

—12 —
6. PRECAUTIONS FOR REPAIR: MODULE QW-2812
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.
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 Aand Cbuttons 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.
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-2812

—13 —
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 Dbutton, press Aand Bbuttons 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 "88" is not appeared on the display, disassemble again the module and check the contact spring
between the Solar cell and PCB.
3. To exit from TEST mode
Press any button.
Figure 3
Figure 1 Figure 2
Press D, Aand Bbuttons
D
B
C
A
Place the watch in a dark
room more than two seconds.
Appear "88" on display.

—14 —
7. TROUBLESHOOTING: MODULE QW-2812
This is a flow chart about signal reception.
Yes
No
Yes
No
Yes
No
Yes
No
START
Check whether the Home City
code is selected correctly.
To perform MANUAL time
calibration signal reception
OK
There is a possibility of location bad.
To perform AUTO time
calibration signal reception
Replace the PCB ass'y
Signal
reception OK?
Signal
reception OK?
Signal
reception OK?
Replace the Case center
ass'y with antenna
Signal
reception OK?
OK
OK
OK

CASIO TECHNO CO.,LTD.
Overseas Service Division
6-2, Hon-machi 1-Chome
Shibuya-ku, Tokyo 151-8543, Japan
Ver. 1 : Apr. 2004
Addition of pages 2, 3, 4, 5 and 6