Casio GW-002J, QW-2914 Service Manual & Parts List
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-883
MAR. 2005
MODULE NO.
QW-2914
GW-002J
Ver.1 : Apr. 2007
R
(WITHOUT PRICE)
CONTENTS
Page
1. SPECIFICATIONS: MODULE QW-2914 .................................................... 1
2. OPERATION CHART: MODULE QW-2914 ............................................... 2
3. DRAWINGS: MODULE QW-2914
3-1. LCD DIAGRAM ............................................................................................ 10
3-2. CIRCUIT DIAGRAM .....................................................................................11
3-3. CHECKING TERMINALS AND COMPONENTS ......................................... 12
4. EXPLODED VIEW: MODULE QW-2914 ................................................... 14
5. PARTS LIST: MODULE QW-2914 ............................................................ 15
6. PRECAUTIONS FOR REPAIR: MODULE QW-2914
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE .....................................16
6-2. ACCURACY CHECKING .............................................................................16
6-3. SOLAR CELL-PCB ASS'Y CONTACT CHECKING....................................17
6-4. HOW TO CHECK TILT SENSOR................................................................. 17
7. TROUBLESHOOTING FOR TIME RECEPTION: MODULE QW-2914 .... 18
8. CHANGES TO THE PCB ASS'Y ...............................................................19
1. SPECIFICATIONS: MODULE QW-2914
Item Detail
Battery CTL1616 (Storage battery)
Note: Use CTL1616 only. Other storage battery or CR1616 can cause
damage to the watch.
Battery life Approx. 8.5 months (from full charged condition)
Current consumption 1.161 µA maximum
Alarm system Piezo plate on Cover/Back
Accuracy ±15 sec./month
Accuracy setting system Trimmer capacitor
Accuracy checking See page 16
Functions • Electro-luminescent backlight
Full auto EL light
• Solar powered
• Battery power indicator
• Power Saving (Turns off the display when the watch is left in the dark)
• Time calibration signal reception
Auto receive (Three times a day at 1:00AM, 2:00AM and 3:00AM)
Manual receive
Last date/time received display
• ReceivableTime Calibration Signals
Fort Collins, Colorado (Call sign: WWVB, Frequency: 60KHz)
Fukushima, Japan (Call sign: JJY, Frequency: 40KHz)
Fukuoka/Saga, Japan (Call sign: JJY, Frequency: 60KHz)
• 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 alarms
5 independent daily alarms(4 one-time alarms and 1 snooze alarm)
• Hourly alarms
• Auto-calendar (to year 2039)
• 12/24-hr format
• Regular timekeeping:
hr, min, sec, pm, month, date, day
• Countdown timer
Measuring unit: 1/10 second
Countdown range: 60 minutes
Countdown start time setting range: 1 to 60 minutes (1-minutes increments)
— 1 —
2. OPERATION CHART: MODULE QW-2914
White indicates “ON”.
Black-On-White White-On-Black
Black indicates “ON”.
This watch is available with either of two different LCD types: light
background with dark figures (black-on-white) or dark background
with light figures (white-on-black).
Note that all of the samples in this manual show the black-on-
white type LCD.
Alarm Time
World Time Mode Alarm Mode
Current Time in Selected City
Alarm Number
City Code
Mode Indicator
Timer Time
Elapsed Time
Stopwatch Mode Timer Mode
Mode Indicator
■ To recover from the sleep state
Power Saving LCD Types
Power Saving causes the watch to enter a sleep state automatically and save power whenever the watch is left in the dark. The Power
Saving feature of the watch is turned on at the factory.
• Note that the watch may also enter the sleep state if the watch is blocked from light by your sleeve.
■ How the sleep state works
Display sleep state
after you place the watch in a well-lit area.
Move the watch to a brightly lit location or press any button. The
watch will also recover from the sleep state if you angle it towards
your eyes for reading (see “To illuminate the display with the auto
• It can take up to two seconds before display figures re-appear
■ To turn Power Saving on and off
light switch”).
The display sleep state is triggered whenever the watch is left in
the dark for about one hour between the hours of 10:00 p.m. and
6:00 a.m.
• The display sleep state causes the display to go blank, except for
Use the procedure under “Configuring Home Time Settings” to turn
Power Saving on or off.
a flashing Power Saving indicator. The alarm and the hourly time
signal continue to operate normally while the watch is in the
display sleep state.
the Stopwatch Mode.
• The watch will not enter the sleep state if it is in the Timer Mode or
Leaving the watch in a drawer or anywhere else it is dark can
cause Power Saving to trigger in order to conserve battery
power.
CC
CC
C button sounds a confirmation tone and cycles through available modes in the sequence shown below.
Power Saving
Indicator
is in the function sleep state, and time calibration signal auto
Function sleep state
The function sleep state is triggered whenever the watch is left in
receive is not performed.
the dark for six or seven days. The power saving indicator stops
flashing and remains on the display to indicate the function sleep
state.
• The alarm and the hourly time signal are disabled while the watch
• Digital timekeeping functions continue to operate normally in the
Modes and Display Screens
function sleep state.
Each press of the
— 2 —
Timekeeping Mode
Graphic Dial
Button
(Screen Switching)
Receive Indicator
Battery Indicator
Button
operation for about two or three minutes.
PM Indicator
(Appears with times
• The display will revert to the Timekeeping Mode automatically if you leave the Alarm Mode screen displayed without performing any
between noon and
midnight.)
Hour, minute,
Button
Button
(Mode switching)
second
Month/Day Day of the Week
Button
(Display Illumination)
A segment appears with the passage of each second of the current minute.
“Receive Indicator”.
Days of the Week
SUN: Sunday MON: Monday TUE: Tuesday WED: Wednesday THU: Thursday FRI: Friday SAT: Saturday
For details about the battery level indicator, see “Battery Level Indicator”. For details about the receive indicator, see
•
•
Changing Display Screen Contents
Each press of the button toggles the lower display contents between the date (month/day) and the day of the week.
Time
Exposure
5 minutes
Approximate
24 minutes
48 minutes
8 hours
6 hours22 hours
30 hours109 hours
61 hours222 hours
The following is the daily
Required Daily Charging Time
•
■ Charging Guide
Starting from a full charge, the watch
should be able to continue operating
for about eight months without
■ Charging Precautions
Avoid charging the watch in the following locations, and anywhere
else where the watch may become very hot.
• On the dashboard of an automobile parked in the sun
Outdoor Sunlight
Exposure Level
further charging under the conditions
described below.
Daily Use (All time values are
approximate.)
heat
• Very close to an incandescent light source or other sources of
• In a location exposed to direct sunlight for long periods
Note that the display panel may become black under very high
temperatures. This is temporary, and the display will appear
(Brightness)
amount of charging required
each day to support the
operations under “Daily Use”.
Daylight Through a
Window on an Overcast
Sunlight Through
• Display Illumination: 1.5 seconds
• Alarm: 10 seconds
• Signal reception: 16 minutes
• Display On: 18 hours
Depending on the light source you are using, the
case of the watch may become quite hot during
normal again at lower temperatures.
Lighting (500 lux)
Making sure the watch is regularly
exposed to light ensures stable
operation.
• Charge Times Required to Advance to a Higher Level
charging. Take care to guard against burn injury after
charging.
charging efficiency.
■ To charge the battery
Point the solar panel (display) of the watch at a light source.
• Remember that even a partial blockage of the solar cell reduces
Indoor
a Window
Day (5,000 lux)
Fluorescent
(10,000 lux)
(50,000 lux)
Approximate Exposure Time
2 hours
5 hours
9 hours
Level 4 Level 3 Level 2 Level 1
(50,000 lux)
(Brightness)
Exposure Level
Outdoor Sunlight
Solar Cell
Example: Positioning the watch
an Overcast Day (5,000 lux)
Sunlight Through a
Window (10,000 lux)
Daylight Through a Window on
– – –– – –
101 hours
Lighting (500 lux)
charging time depends on a variety of environmental factors.
Indoor Fluorescent
• Note that the above charging times are for reference only. Actual
• The illustration shows the resin band model.
your sleeve covers the display of the watch.
watch towards your face. This does not indicate malfunction.
or 2.5 seconds) only, even if you leave the watch angled towards
your face.
Auto Light Precautions
• Frequent use of the auto light can run down the battery.
• The auto light switch may cause the display to illuminate when
• The display may not illuminate immediately when you angle the
Rotate your arm so the watch
is angled at about 40 degrees,
22
22
2
With the watch on
your wrist, position it
11
11
■ Positioning Y our Arm Correctly
1
power is at Level 3 or lower.
• The display remains illuminated for the currently set duration (1.5
• The auto light switch is automatically disabled whenever battery
• The display may illuminate unintentionally when you wear the
At least40degrees
so you can read its display.
level with the ground.
watch on the inside of your wrist, when you shake your arm, or
when you raise your arm. Be sure to turn off the auto light
switch whenever you do not need display illumination.
the watch on the inside of your wrist.
operation and even make operation impossible. If this happens
lower your arm to the starting position and then raise it again. If
you still have trouble with illumination, try lowering your arm down
• Keep the auto light switch turned off whenever you are wearing
to your side and then raise it to your face for reading.
• Electro-static charge and magnetism can interfere with auto light
.
within ±15 degrees of being parallel
with the ground. The auto light switch
may not operate properly if the angle is
greater.
right (3 o’clock) sides of the watch are
when using the auto light switch.
• You should be wearing the watch on the outside of your wrist
• Make sure that the left (9 o’clock) and
sunlight.
display is illuminated, illumination will turn off.
calibration signal manual receive operation.
illuminated. This is caused by vibration of the EL panel used of
Important!
• The light may be difficult to see if you turn it on under bright
• If you press any button or if an alarm operation starts while the
illumination, and does not indicate malfunction
• Display illumination does not work while you are performing a time
• You may hear humming sound from the watch while the display is
All functions, including timekeeping,
Normal operation enabled.
Normal operation enabled.Level 1
Black
White-On-
White
Black-On-
Battery Level Indicator
Level 2
disabled.
Digital display, illumination, alarms,
tones (alarms, hourly time signal),
and signal reception disabled.
Level 3
Level 4
Power Supply
The power supply of this watch uses a solar cell to generate
electrical power, which is stored by a rechargeable battery. Using
or storing the watch where it is not regularly exposed to light, or
allowing it to be blocked from light by your sleeve for long periods
as you are wearing it can cause the power of the rechargeable
battery to run down. To ensure stable operation, be sure to allow
the watch to be exposed to light as much as possible when you
are wearing or storing it.
Important!
Note that all data in memory and all settings are cleared whenever
you allow the level of the rechargeable battery to drop to Level 4.
■ Flashing Recover Indicator
If you use the light or alarm a number of times during a short
period, a recover (RECOV) indicator flashes on the display and
the battery level indicator to indicate a level momentarily that is higher
than the actual battery level. Because of this, you should wait for a
short while after charging to check the battery level indicator.
normal operation by charging the battery.
the battery reaches Level 3. At this time you will be able to
configure time and date settings, but you should keep the watch
• Exposing the watch to direct sunlight or other strong light may cause
exposed to light until the battery reaches Level 2 or Level 1.
• Even after the battery drops to Level 4, you will be able to resume
• When charging from Level 4, the display will start operating when
■ Start charging at Level 3!
Battery Level 3 indicates that remaining battery power is very low.
Be sure to expose the watch to light for recharging as soon as
possible after the Level 3 indicator starts to flash.
Recover
Indicator
Display Illumination
the following operations become disabled as battery power
recovers.
• Display illumination,
• Alarm and hourly time signal
• Time calibration signal reception
Normal operation will return after the
battery recovers.
— 3 —
light switch
■ To illuminate the display with the auto
An EL (electroluminescent) panel is used to illuminate the display
of the watch for easy reading in the dark. An auto light switch
automatically illuminates the display when you angle the watch
towards your eyes for reading.
surrounding light is bright.
The auto light switch automatically illuminates the display
whenever you angle the watch towards your eyes for reading,
but only when it is dark.
• The auto light switch does not illuminate the display when
You can use the procedure under “To specify the illumination
duration” to configure the illumination duration as approxi-
mately 1.5 seconds or 2.5 seconds.
■ To turn the auto light switch on and off
While a setting screen (one on which a setting is flashing) is on the
display, hold down the L button for about two seconds to toggle
the auto light switch on (auto light switch on indicator displayed)
and off (no indicator displayed).
LL
LL
L button in any
You may hear a faint rattling sound when you move the watch
around. This sound is caused by the movement of a metal
“To specify the illumination
duration” to select either
1.5 seconds or 2.5 seconds for
Press the
mode to illuminate the display
of the watch.
■ To illuminate the display manually
the illumination duration.
• You can use the procedure under
• Pressing the L button illuminates the display regardless of
bulb that controls operation of the auto light switch, and does
whether the auto light switch is on or off.
Auto Light
Switch On
Indicator
not indicate malfunction.
Note that transmission of the time calibration signal may be
the National Institute of Information and Communications
Technology (NICT). It is a long wave signal transmitted 24 hours a
day from the Mt. Otakadoya transmitter (40kHz) located in
Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane
transmitter (60kHz) located on the border between Saga
Calibration Signal
• The Japanese calibration signal (Call Sign: JJY) is maintained by
Prefecture and Fukuoka Prefecture.
• The U.S. calibration signal (Call Sign: WWVB) is transmitted by
Signal is received
using built-in antenna.
Long-
wave time
calibration
interrupted occasionally due to maintenance, lightning, etc.
the National Institute of Standards and technology from Fort
Collins, Colorado.
Watch decodes
received data
and converts it
to time data.
Time is adjusted
according to time
data.
Decode
Internally
Time data
Signal data
signal
atch
W
receive operation is performed at 4:00. If receive is still
unsuccessful, it is performed again at 5:00.
receive operation is performed again at midnight the following
day.
receive operation is performed at 3:00. If receive is still
unsuccessful, it is performed again at 4:00.
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration
signal.
Auto Receive (3 times per day)
When the Home City setting is TYO or SEL, the time calibration
signal is received automatically at 1:00, 2:00, and 3:00 each
morning.
• If both the 2:00 and 3:00 receive operations are unsuccessful, a
• If all five of the above receive operations are unsuccessful, a
When the Home City is NYC, CHI, DEN, or LAX, auto receive is
Near high-voltage linesAmong or near buildings
receive operation is performed again at 5:00.
performed at midnight, and at 1:00 and 2:00 in the morning.
• If both the 1:00 and 2:00 receive operations are unsuccessful, a
• If all five of the above receive operations are unsuccessful, a
Manual receive (You initiate reception using a button operation.)
Next to a household appliance
or office equipment (TV, speaker ,
fax, computer, cell phone, etc.)
The watch is set up for auto receive at the factory, so all you
need to do is to place it in a location that allows good
reception each night.
Near mountains
clock
How a Radio-controlled Watch Works
What is a radio-controlled watch?
Your radio-controlled watch is designed to receive a time
indicator)
BB
BB
B button to
indicator).
and 2.5 seconds
Press the
3.
(
toggle the illumination
duration between about
1.5 seconds (
Transmitter
calibration signal that contains standard time data, and adjust its
current time setting accordingly.
AA
AA
A
After the setting is the way you want, press the
button to exit the setting screen.
4.
Home City Code
atomic
Cesium
do not perform any operation for about two or three minutes.
• The watch will also exit the setting screen automatically if you
Seconds
(3 times)
After the watch receives the Standard Time signal, it performs
internal calculations to determine the current time. Because of
this, there may be an error of up to one second in the
displayed time.
Location
is receiving the calibration signal.
Reception is difficult and may even be impossible in the locations
described below. Avoid such locations when performing signal
reception.
• You should think of your watch operating like a radio or TV when it
Transmitter
U.S. Transmitter
Location
Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz)
Fort Collins, Colorado signal
1000km
Inside a vehicle
(automobile, train, plane, etc.)
Fort Collins
3000km
1000km
(40kHz)
Mt. Otakadoya
500km
If you are experiencing problems with reception, move away
from the types of locations described above to a location with
In a location where there is
radio interference
receivable up to 3,000 kilometers from the transmitter. Note
that the wave is relatively weak at distances greater than
1,000km, so reception may be poor at long distances.
• Under optimum conditions, the calibration signal should be
1000km
better reception, and try again.
(construction site, airport, etc.)
AA
AA
A for about
In the Timekeeping Mode,
hold down
two seconds.
City code to flash on the
■ To specify the illumination duration
• This will cause your Home
1.
CC
CC
C button three
Press the
times to display the
display.
flashing seconds count.
2.
Reception Range
This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB). The signal that is
received depends on the current Home City setting.
— 4 —
Japan Transmitter
Locations
500km
(60kHz)
Mt. Hagane
receivable up to 1,000 kilometers from the transmitter. Note
that the wave is relatively weak at distances greater than
500km, so reception may be poor at long distances.
• Under optimum conditions, the calibration signal should be
range of the transmitter.
• Geographic contours, nearby buildings, seasonal conditions, the time of day, can even make reception impossible even when you are within
• Best reception is possible late at night.
TYO, SEL
Home City
LAX, DEN, CHI, NYC
City Code List”.
• For information about selecting a Home City, see “Configuring Home Time Settings”. For information about city codes, see the “World Time
DD
DD
D button.
reception date screen and the last reception time screen at two-
second intervals.
able to perform any signal reception successfully.
In the Timekeeping Mode, press the
■ To view the last reception date and time
• This causes the display to start alternating between the last
Receive Indicator
■ Receive Indicator
The receive indicator cycles from
“Unstable” through “Stable” as
shown below while reception is in
progress. How far it cycles depends
on the signal strength. Keep the
you do not perform any operation for about two or three minutes.
• “– – –” will appear in the digital display if the watch has not been
• To return to the Timekeeping Mode, press the D button again.
• The watch will return to the Timekeeping Mode automatically if
Stable
Unstable
White-On-
watch in a location where reception
Black
is stable while reception is in
progress.
2 seconds
Last reception
date
seconds for reception to stabilize.
Black-On-
White
• Even under optimum reception conditions, it can take about 10
Last reception
time
determine the best location for signal reception.
factors can all affect reception.
• Use the receive indicator to check reception status and to
• Note that weather, the time of day, surroundings, and other
Timekeeping Mode or World Time Mode only.
Calibration Signal Reception
Precautions
• Auto reception can be performed while the watch is in the
• AUTO
Auto Receive Settings when the Home City is TYO
or SEL
progress.
the watch to beep and then exit the receive operation.
transmitter before performing the reception operation. Remember
that geographic contours, nearby buildings, seasonal conditions,
the time of day, can even make reception impossible even when
you are within range of the transmitter.
the signal. If reception is unsuccessful, try again.
accordance with the calibration signal transmitted in Japan and
the United States only. It operates like a standard (non-radio
controlled) watch outside of the range of the receivable time
calibration signal transmitters.
calibration signal for some reason, timekeeping accuracy is within
±15 seconds per month.
• Reception cannot be performed while Timer Mode countdown is in
• Pressing any button while auto reception is in progress will cause
• Make sure you are within the range of the calibration signal
• Proper reception may be impossible if there is something blocking
• This watch is designed to adjust its current time setting in
J40
J60
Auto receive turned on for the Mt. Otakadoya signal (40kHz).
Auto receive turned on for the Mt. Hagane signal (60kHz).
Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal
(60kHz), whichever is strongest.
Auto receive turned on with automatic selection of either the
•
Auto receive turned off.
•
• OFF
Auto Receive Settings when the Home City is NYC,
CHI, DEN, or LAX
being performed.
• When the watch is unable to adjust its time signal using the
• Strong electrostatic charge can cause timekeeping error.
• Signal reception is cancelled if the alarm starts to sound while it is
Auto receive turned on for the Ft. Collins, Colorado signal.
• OFF
• ON
Attempting a receive operation after that causes an error.
• The watch’s calendar shows dates up to the year 2099.
Auto receive turned off.
DD
DD
DD
DD
D button for about
reception will start. An indicator
down the
two seconds.
• The watch will beep and
will appear on the display to
In the Timekeeping Mode, hold
■ To perform manual receive
D button.
indicate reception conditions.
Press the
• All other buttons besides D are disabled during signal reception.
When reception is successful
■ To interrupt reception
Resin band
The watch terminates reception and adjusts the current time. Next
it beeps and then displays the date and time that the adjustment
reception
approximately in the direction of the signal transmitter. Keep the
■ To position the watch for optimum
watch away from metal objects.
Remove the watch from your wrist and place it somewhere so its
top (12 o’clock side, where the antenna is located) is facing
BB
BB
B buttons
DD
DD
D and
press the D button or if you do not perform any operation for
about two or three minutes.
was performed.
• The watch will return to the Timekeeping Mode screen if you
Metal band
• Orienting the watch so it is sideways to the transmitter makes it
press the D button or if you do not perform any operation for
Reception Error (ERR Indicator)
more difficult to receive the signal.
about two or three minutes.
The watch does not adjust its current time setting, and displays
“ERR” when signal reception is unsuccessful for some reason.
• The watch will return to the Timekeeping Mode screen if you
transmitter selection mode, signal reception can take up to
• Do not move the watch while it is receiving the calibration signal.
■ Time Required for Reception
12 minutes.
A calibration signal receive operation takes anywhere from about
two to five minutes.
• Note that when “AUTO” (Auto Select) is specified as the
Use the
3.
• See “Configuring Auto Receive Settings” for more information.
Configuring Auto Receive Settings
— 5 —
AA
to cycle through the
available auto receive
settings.4.When the setting is the
Use the procedure below to turn auto receive of the time
calibration signal on or off. When TYO (Tokyo) or SEL (Seoul) is
selected as your Home City, you can also specify the transmitter
selection mode, which controls which Japanese transmitter signal
should be used for time calibration.
• For information about selecting your Home City, see “Configuring
AA
way you want, press the
A button.
screen and return to the last
reception date and time
screens.
Mode, press the D button
• This will exit the setting
NYC, CHI, DEN, or LAX is selected as the Home City.
Home Time Settings”.
TYO (Tokyo); Auto Receive = On; Transmitter = AUTO
• The initial factory default settings for auto receive are Home City =
• The following procedure can be performed only when TYO, SEL,
■ To configure auto receive settings
again.
• To return to the Timekeeping
• The watch will return to the
DD
DD
D button.
In the Timekeeping Mode,
press the
start alternating between the
last reception date and time
• This causes the display to
1.
Timekeeping Mode
automatically if you do not
perform any operation for
about two or three minutes.
screens.
Timekeeping Mode
automatically if you do not
perform any operation for
about two or three minutes.
• The watch will return to the
AA
AA
A button
Hold down the
for about two seconds.
auto receive setting to flash
on the display.
• This will cause the current
2.
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