S
ERVICE
M
ANUAL
& PARTS LIST
MODULE NO.
QW-3721
REF. NO. S/M-920
OCT. 2005
OCW-110TDJOCW-100TDJ
Ver.1 : Jun. 2010
(WITHOUT PRICE)
CONTENTS
Page
1. SPECIFICATIONS: MODULE QW-3721 .................................................... 1
2. OPERATION CHART: MODULE QW-3721 ............................................... 2
3. DRAWINGS: MODULE QW-3721
3-1. CIRCUIT DIAGRAM ...................................................................................... 8
3-2. CHECKING TERMINALS AND COMPONENTS .......................................... 9
4. EXPLODED VIEW: MODULE QW-3721 ................................................... 10
5. PARTS LIST: MODULE QW-3721 ............................................................ 11
6. PRECAUTIONS FOR REPAIR: MODULE QW-3721
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
6-4. TIME CALIBRATION SIGNAL TEST MODE ............................................... 13
6-5. SECOND HAND MOVEMENT ACCURACY CHECK MODE ...................... 13
7. TROUBLESHOOTING: MODULE QW-3721.............................................14
1. SPECIFICATIONS: MODULE QW-3721
Item Detail
Battery CTL1025 (Storage battery)
Note: Use CTL1025 only. Other storage battery or CR1025 can cause
damage to the watch.
Battery life Approx. 4 months
Current consumption 0.53 µA maximum: Follow the procedure described below to measure the
current consumption. Energize while pressing the B button.
Release energizing after releasing the B button.
Alarm system Piezo plate on Cover/Back
Accuracy ±20 sec./month
Accuracy setting system Chip capacitor selection
Accuracy checking See page 12
Functions • Solar powered
• Time calibration signal reception
Auto receive
Manual receive
• Time Calibration Signal
Receivable Time Calibration Signals
Fukushima, Japan (Call Sign: JJY, Frequency: 40kHz)
Fukuoka/Saga, Japan (Call Sign: JJY, Frequency: 60kHz)
• Low battery warning display
• Auto-calendar
• Regular timekeeping:
Analog: 3 hands (Hour, minutes, seconds)
• LED light (with full auto light function)
• Daily alarms
— 1 —
2. OPERATION CHART: MODULE QW-3721
Alarm Mode
OFF
ON
Use this mode to check if
signal reception is being
performed normally.
The second hand will move
to either “GET” or “NG”.
Receive Result Mode
Use this mode to adjust
the home positions of
the analog hands.
The home positions of the
hands are correct when
they point to 12 o’clock.
Use this mode to set the alarm time and to turn
the alarm on or off.
The second hand will move to either “ON” or “OFF”.
Receive
Successful
Home Position Adjustment Mode
Receive Failed
Time
Exposure
6 minutes
Approximate
(50,000 lux)
The following is the daily
•
Required Daily Charging Time
Charging Guide
(Brightness)
amount of charging required
each day to support the
operations under “Daily Use”.
Exposure Level
Outdoor Sunlight
Illumination: 1.5 second
Alarm: 10 seconds
•••
Starting from a full charge, the watch
should be able to continue operating
Daily Use
for about four months without further
charging under the conditions
described below.
Depending on the light source you are using, the
case of the watch may become quite hot during
30 minutes
Sunlight Through a
Window (10,000 lux)
Signal reception: 1
charging. Take care to guard against burn injury
after charging.
8 hours
48 minutes
(5,000 lux)
Overcast Day
Lighting (500 lux)
a Window on an
Indoor Fluorescent
Daylight Through
Approximate Exposure Time
Exposure Level
Charge Times Required to Advance to a Higher Level
operation.
•
Making sure the watch is regularly
exposed to light ensures stable
12 hours
61 hours
Full Charge
1 hour
2 hours
Timekeeping Restored
(50,000 lux)
(Brightness)
Outdoor Sunlight
Sunlight Through a
Window (10,000 lux)
Daylight Through a Window on
Solar Cell
– – –
– – –
3 hours
30 hours
Lighting (500 lux)
Indoor Fluorescent
Note that the above charging times are for reference only. Actual
an Overcast Day (5,000 lux)
charging time depends on a variety of environmental factors.
•
Minute Hand
Hour Hand
Button
(Light)
Date
nd
econd Ha
S
Button
(Mode Change)
Charging Precautions
On the dashboard of an automobile parked in the sun
Very close to an incandescent light source or other sources of
In a location exposed to direct sunlight for long periods
heat
Avoid charging the watch in the following locations, and anywhere
else where the watch may become very hot.
•
•
■■
To ensure stable operation, be sure to allow the watch to be exposed to light as
much as possible.
•
To charge the battery
Remember that even a partial blockage of the solar cell reduces
Example: Positioning the watch
charging efficiency.
Point the solar cell (face) of the watch at a light source to charge
the battery.
•
■
Auto and manual
calibration signal
reception
Face illumination
movement.••
Alarm
•
Indicates date home position.
Jumps two seconds1-second movement
The following
operations are disabled
during 2-second hand
Important!
Hands
stop at 12
o’clock.
Battery level
drops further
due to
insufficient
charging.
The illustration shows the resin band model.
•
BB
BB
B button sounds a confirmation tone and cycles through available modes in the sequence shown below.
Timekeeping Mode
Modes and Hand Movement
The watch will revert to the Timekeeping Mode automatically if you leave it in any other mode without performing any operation for about two
or three minutes.
Each press of the
•
Battery level
drops due to
insufficient
charging.
If the time setting is not correct...
Normally, you should never need to adjust the time setting of the watch as long as it is
able to receive a time calibration signal. If signal reception is impossible for some reason,
use the procedures under “Adjusting the Home Positions” to check the home positions of
the hands, and make adjustments as required.
Power Supply
A low battery can cause timekeeping to stop, and can also cause time and alarm settings to be lost.
Face illumination or alarm operation can cause hand movement to stop due to the sudden temporary drop in battery power. This does not
indicate malfunction, and normal operation will resume when the watch is exposed to light. Though hand movement stops, timekeeping
The power supply of this watch uses a solar cell to generate electrical power, which is stored by a rechargeable battery. Using or storing
continues internally, and the hands will be adjusted to the correct setting when normal operation returns.
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.
•
•
Normal Low Power Alert Timekeeping Disabled
Checking the Battery Level
Low battery power is indicated when the the second hand starts to jump at two-second intervals.
■
— 2 —
). If battery power drops to the next lower level, and the hands will stop at 12 o’clock.
Keep the watch exposed to light until normal operation returns.
Even after the battery drops to the level that timekeeping becomes disabled, you will be able to resume normal operation by charging the
After timekeeping becomes disabled, the hands will move to the current time after the battery is recharged sufficiently.
battery.
If 2-second hand movement is being performed when the current time reaches midnight, the date indicator will change to the home
position indicator (
•
•
•
Near high-voltage lines
Next to a household
appliance or office equipment
(TV, speaker, fax, computer,
cell phone, etc.)
Near mountains
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
sleeve covers the face of the watch.
• The face may not illuminate immediately when you angle the
Auto Light Precautions
• Frequent use of the auto light can run down the battery.
• The auto light switch may cause the face to illuminate when your
Rotate your arm so the watch
is angled at about 40 degrees,
so you can read its face.
22
22
2
With the watch on
your wrist, position it
level with the ground.
11
11
Positioning Your Arm Correctly
1
• The face may illuminate unintentionally when you wear the watch
• The auto light switch is disabled automatically during 2-second
• The face remains illuminated for 1.5 seconds only, even if you
• Keep the auto light switch turned off whenever you are wearing
At least40degrees
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 face illumination.
hand movement.
leave the watch angled towards your face.
watch towards your face. This does not indicate malfunction.
to your side and then raise it to your face for reading.
the watch on the inside of your wrist.
• Electro-static charge and magnetism can interfere with auto light
right (3 o’clock) sides of the watch are
within ±15 degrees of being parallel
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
with the ground. The auto light switch
may not operate properly if the angle is
greater.
sunlight.
face is illuminated, illumination will turn off.
• If you press the B button or if an alarm operation starts while the
Important!
• The light may be difficult to see if you turn it on under bright
Location
Reception Range
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
1000km
Transmitter Locations
This watch is designed to receive either the Mt. Otakadoya signal
(40kHz) or the Mt. Hagane signal (60kHz), whichever is strongest.
Among or near buildings
(40kHz)
Mt. Otakadoya
500km
500km
(60kHz)
Mt. Hagane
Inside a vehicle
(automobile, train, plane, etc.)
1000km
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
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 (construction
time of day, can even make reception impossible even when you
are within the range of the transmitter.
• Geographic contours, nearby buildings, seasonal conditions, the
• Reception is best at night.
better reception, and try again.
site, airport, etc.)
The auto light switch does not illuminate the face when
To illuminate the face with the auto light
switch
■
Face Illumination
An LED light is used to illuminate the face of the watch for easy
reading in the dark. An auto light switch automatically illuminates
the face when you angle the watch towards your eyes for reading.
surrounding light is bright.
The auto light switch automatically illuminates the face
whenever you angle the watch towards your eyes for reading,
but only when it is dark.
•
AA
AA
A button.
To illuminate the face manually
In the Timekeeping Mode,
press the
■
To turn the auto light switch on and off
The auto light switch will illuminate the face for about 1.5
seconds in any mode.
This illuminates the face for
about 1.5 seconds.
•
In the Receive Result Mode, hold down the A button for about
■
three seconds to toggle the auto light switch on and off.
You may hear a faint rattling sound when you move the watch
around. This sound is caused by the movement of a metal
bulb that controls operation of the auto light switch, and does
Pressing the A button illuminates the display regardless of
whether the auto light switch is on or off.
•
not indicate malfunction.
— 3 —
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
Calibration Signal
Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane
• The Japanese calibration signal (Call Sign: JJY) is maintained by
How a Radio-controlled Watch Works
What is a radio-controlled watch?
Your radio-controlled watch is designed to receive a time
calibration signal that contains standard time data, and adjust its
current time setting accordingly.
interrupted occasionally due to maintenance, lightning, etc.
transmitter (60kHz) located on the border between Saga
Prefecture and Fukuoka Prefecture.
Time is adjusted
according to
to time data.
Decode
Time data
Cesium
time data.
Internally
atch
W
atomic clock
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.
Watch decodes
received data
and converts it
Signal is received using
built-in antenna.
Signal data
Long-wave
time
calibration
signal
Transmitter
Auto reception can be performed while the watch is in the
If the hands become misaligned for some reason, they may not
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
Timekeeping Mode only.
indicate the correct time, even if the time calibration signal is
received normally. If this happens, use the procedure under
“Adjusting the Home Positions” to adjust the home positions of the
hands and the date.
the watch to beep and signal reception to stop.
Calibration Signal Reception
Precautions
•
•
transmitter before performing the reception operation. Remember
•
•
This watch is designed to adjust its current time setting in
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.
•
•
BB
BB
B button twice
Press the
When the watch is unable to receive the time calibration signal for
Strong electrostatic charge can cause timekeeping error.
Signal reception is cancelled if the alarm starts to sound while it is
accordance with the calibration signal transmitted in Japan only. It
operates like a standard (non-radio controlled) watch outside of
the range of the receivable time calibration signal transmitters.
The watch’s calendar shows dates up to the year 2099.
some reason, timekeeping accuracy is within ±20 seconds per
month.
being performed.
Attempting a receive operation after that causes an error.
•
•••
to return to the
5.
Timekeeping Mode.
This causes the second hand
to move to the seconds count
of the current time and
resume normal movement.
•
OFF
ON
To turn the alarm on or off
If you do not perform any button operation for about two or three
minutes, the watch will exit the setting mode and resume normal
hand movement.
•
AA
AA
In the Alarm Mode, press the
A button to toggle the alarm
on and off.
■
To stop the alarm beeper
Pressing any button while the beeper is sounding stops it.
■
BB
BB
B button. This enters
To check the result of the last signal
receive operation
■
Time Required for Reception
A calibration signal receive operation takes anywhere from about
two to seven minutes.
■
operation since midnight, the second hand will move to GET. If
the watch has been unable to receive any signal successfully, the
second hand will move to NG.
times.
The watch will also return to the Timekeeping Mode if you do not
In the Timekeeping Mode, press the
the Receive Result Mode.
• If the watch was able to perform a successful signal receive
BB
BB
B button for about
To perform manual receive
In the Timekeeping Mode, hold
down the
■
perform any operation for about two or three minutes.
• To return to the Timekeeping Mode, press the B button three
•
To interrupt reception
The watch will beep, and signal
reception will start.
two seconds.
•
■
When reception starts
Press any button.
The second hand moves to READY.
■
GET
NG
The current receive result is cleared each day at midnight.
This means GET indicates successful signal reception since
the start of the current day.
During reception
The hour and minute hands continue to keep time normally.
•
■
After reception is complete
The hour and minute hands continue to keep time normally.
Do not move the watch until calibration signal reception is complete.
•
•
The second hand moves to WORK.
■
BB
BB
AA
AA
A button.
To set the alarm time by moving the hands
receive fails after auto receive is successful.
• GET continues to be indicated even if an attempt at manual
If reception is successful, the second hand will move to GET. One
or two minutes later, the hands will move to the correct time.
If reception is not successful, the second hand will move to NG
(No Good). One or two minutes later, the second hand will resume
•
•
counterclockwise
This will cause the minute hand
Press the
3-b
•
normal operation, without any adjustment of the hand setting.
B button.
to move counterclockwise about
one or two minutes, and then
Set the alarm time you want.
3.
Each press of the B button
stop around 12 o’clock.
Press the
•
clockwise, go to step 3-a.
counterclockwise, go to step 3-b.
• If you want to set the alarm time by moving the hands
• If you want to set the alarm time by moving the hands
AA
AA
When the setting is the
way you want, press the
A button.
This will cause the hour and
minute hands to move to the
current time, and the second
hand to move to “ON” (alarm
on).
Setting the alarm time causes
moves the setting
counterclockwise by one minute.
Holding down the B button for about two seconds moves the
hands counterclockwise at high speed. High-speed movement of
the hands will continue until it completes a 12-hour cycle, or until
you press any button to stop it.
•
the hour hand moves past 12 o’clock while you are setting
the alarm time.
When setting the alarm time, take care to set AM and PM
correctly.
• The second hand will move between AM and PM any time
To set the alarm time by moving the hands
3-a
•
4.
BB
BB
B button.
clockwise
Each press of the B button
moves the setting clockwise by
one minute.
Press the
•
the alarm to turn on
•
Holding down the B button for
about two seconds moves the
hands clockwise at high speed.
High-speed movement of the
hands will continue until it
completes a 12-hour cycle, or until
•
automatically.
button to advance to step 4.
you press any button to stop it.
• After the alarm time setting is the way you want, press the A
1:00, 2:00, 3:00, 4:00 and 5:00 each morning.)
To position the watch for optimum
reception
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration
operations for that day are not performed.
signal.
Auto receive (Reception is performed automatically at midnight,
Manual receive (You initiate reception using a button operation.)
• When any auto receive is successful, further auto receive
• Successful auto receive keeps timekeeping accurate.
Remove the watch from your wrist and place it somewhere so its
right side (9 o’clock side, where the antenna is located) is facing a
window.
■
9 o’clock
side
PM
AM
Or
Using the Alarm
• Do not move the watch while it is receiving the calibration signal.
OFF
ON
BB
BB
B button twice
In the Timekeeping Mode,
press the
to enter the Alarm Mode.
The second hand will move to
either “ON” (alarm on) or
To set an alarm time
You can set an alarm time in 1-minute units. The watch beeps for 10 seconds when the alarm time is reached.
1.
■
“OFF” (alarm off).
•
Example: Midnight
AA
AA
A button
Hold down the
for five seconds to display
the setting screen.
The second hand will move to
“AM” or “PM”.
Note that the hands do not
move while the alarm setting
•
2.
•
screen is on the display.
— 4 —
12 o’clock
Press the B button to align
the hour and minute hands
with 12 o’clock.
moves the hand setting
Adjust the hour and
minute hand home
position.
If the hour and minute hand home position is off
If the hour and minute hands are pointing at 12 o’clock
and you want to set the hands by moving them
counterclockwise, advance to step 8.
Use the following steps to move
the hands clockwise.
7.
10 seconds.
Each press of the B button
•
•
AA
AA
Holding down the B button for about two seconds moves the
hands at high speed. High-speed movement of the hands will
continue until it completes a 12-hour cycle, or until you press
any button to stop it.
Move the hands at high speed until just before the setting you
want. Stop high-speed movement, and then press the B
button to move in 10-second increments to move the hands to
•
12 o’clock.8.To move the hands
•
A button.
counterclockwise, press
the
hand to move
counterclockwise about one
or two minutes, and then stop
around 12 o’clock.
• This will cause the minute
BB
BB
B button to
Press the
return to the Timekeeping
Mode.
to move to the seconds count
• This causes the second hand
14.
indicator
of the current time, where it
starts normal movement.
After you complete the home position adjustment procedure,
place the watch in a location that allows good time calibration
signal reception, and then perform a manual receive
The watch will return to the Timekeeping Mode automatically if you
leave it in the Home Position Adjustment Mode without performing
any button operation for two or three minutes.
operation. See “To perform manual receive” for more
information.
12 o’clock
Correct Alignment
AA
AA
A button to
Press the
advance to hour and
minute hand home
position adjustment.
5.
• If current hour and minute
12 o’clock
Check the position of the
second hand.
3.
12 o’clock
hand alignment is correct,
they will both move to
12 o’clock.
Check the position of the
6.
If the second hand is not
pointing at 12 o’clock, it
means that its home position
is off.
•
hour and minute hands.
are not pointing at 12 o’clock,
it means that their home
position is off.
• If the hour and minute hands
12 o’clock
BB
BB
B button to
If the second hand home position is off
Press the
move the second hand
clockwise, until it points at
12 o’clock.
Each press of the B button
advances the second hand by
one second.
for about two seconds
advances the second hand at
high speed. High-speed
movement of the second hand
will continue until it completes
a full revolution, or until you
•
If the second hand is pointing at 12 o’clock, advance to step 5.
4.
• Holding down the B button
press any button to stop it.
does not appear for the dateIf
If appears for the date, advance to step 13.
Perform the following
steps to adjust the date
home position.
Hold down the B button for
about two seconds to start
automatic high-speed
scrolling of the date. The
is located between 31 and 1.
When the date gets close to
31, press the B button again
to stop the scrolling. Press the
indicator
Check the date indicator.
11.
12.
Correct Alignment
AA
AA
A button to
Press the
10.
if the date home position
advance to date home
position adjustment.
The date indicator will show
•
•
appears.
is correct. Note that it can
take up to 90 seconds before
AA
AA
A button to exit
appears.
B button to advance the date
until
Press the
home position adjustment.
This causes the date to
•
13.
, it
something other than
means that the date home
position is off.
• If the date indicator shows
change to the current date,
and the hour and minute
hands to move to the current
time.
Note that all button operations
are disabled while the date is
changing, and the hour and
minute hands are moving.
•
12 o’clock
Correct Alignment
BB
BB
B button three
In the Timekeeping Mode,
press the
times to enter the Home
Position Adjustment
Adjusting the Home Positions
Use the following procedure to adjust the home positions of
the hands and the date when the time setting is wrong, even
after the time calibration signal is received normally.
Mode.
1.
AA
AA
A button until the
second hand performs a
full rotation and stops
(about five seconds).
To adjust the second hand
home position, hold down
the
2.
move during home position
• The analog hands do not
adjustment.
— 5 —
12 o’clock
Use the following steps to
move the hands
counterclockwise.
the hour and minute hands
with 12 o’clock.
moves the hand setting 10
seconds.
If the hour and minute hand home position is off
If the hour and minute hands are pointing at 12 o’clock,
advance to step 10.
9.
• Press the B button to align
for about two seconds moves
• Each press of the B button
• Holding down the B button
the hands at high speed.
High-speed movement of the
hands will continue until it
completes a 12-hour cycle, or
until you press any button to
stop it.
want. Stop high-speed movement, and then press the B
button to move in 10-second increments to move the hands to
• Move the hands at high speed until just before the setting you
12 o’clock.
BB
BB
B button to move
To set the alarm time by moving the hands
To set the alarm time by moving the hands
clockwise
2-a
about two seconds moves the
hands clockwise at high speed.
High-speed movement of the
hands will continue until it
• Holding down the B button for
completes a 12-hour cycle, or
Press the
the hands clockwise by one
minute.
until you press any button to stop
it.
counterclockwise
step 3.
2-b
• After setting the time you want, press the A button to advance to
BB
BB
AA
AA
A button.
Press the
• This will cause the minute hand
B button to move
to move counterclockwise about
one or two minutes, and then
stop around 12 o’clock.
Press the
the hands counterclockwise
BB
BB
B button to
advance the month by
hands counterclockwise at high speed. High-speed movement of
the hands will continue until it completes a 12-hour cycle, or until
you press any button to stop it.
by one minute.
• Holding down the B button for about two seconds moves the
one.
5. Press the
10’s digit of year setting
10
AA
AA
A button.
6. Press the
00
the ten’s digit of the year
setting.
• The second hand will move to
30
20
40
50
60
70
80
90
AM
10:09 a.m.
Example: Current time is
AA
AA
A button
hold down the
for about five seconds
until the second hand
stops at AM or PM.
Note that the hands of the
watch do not move in the
manual setting mode.
If you do not perform any
button operation for about two
or three minutes, the watch
will exit the manual setting
mode and normal hand
movement will resume.
Pressing the A button and the B button at the same time in
To manually set the hour and minute
1. In the Timekeeping Mode,
■
You can perform the following procedures to adjust
the time and date when the watch is unable to
receive a time calibration signal for some reason.
•
SEC
AA
AA
A button twice.
hand to move to SEC.
watch do not move in the
manual setting mode.
• This will cause the second
• Note that the hands of the
2. Press the
•
the manual setting mode will cause the hands to move to the
•
BB
BB
B button.
signal on the TV or radio,
press the
3. In accordance with a time
Use one of the operations described below set the hands.
original (unadjusted) time setting. Then the watch will return to
the Timekeeping Mode.
This will increase the minute
•
To move the hands clockwise
2.
setting by one and restart the
seconds count from 00.
• In Japan, you can obtain the
To move the hands counterclockwise
Advance to step 2-a.
■
■
current time by dialing 117 on
the telephone.
Advance to step 2-b.
hand will switch between AM and PM.
When adjusting the hour and minute hands, make sure you
set a.m. and p.m. times correctly.
• Whenever the time setting passes 12 o’clock, the second
Date
BB
BB
B button to
advance the date by one.
skips the end of the month
date (30 or 31) you are trying
to set, first perform the steps
below to change the month
• If the watch automatically
3. Press the
AM
10:09 a.m.
Example: Current time is
AA
AA
A button
hold down the
for about five seconds
until the second hand
To adjust the date
■
stops at AM or PM.
1. In the Timekeeping Mode,
Dec
AA
AA
A button.
setting and then come back to
adjust the date setting.
watch do not move in the
manual setting mode.
• Note that the hands of the
the current month setting.
• The second hand will move to
4. Press the
button operation for about two
or three minutes, the watch
will exit the manual setting
mode and normal hand
movement will resume.
• If you do not perform any
Current month
Feb
Jan
Nov
Oct
12 o’clock
AA
AA
A button three
times.
• The second hand will move to
2. Press the
Mar
Sep
12 o’clock.
Apr
May
Jun
Jul
Aug
Adjusting the Time Manually
If you become confused and lose your way during the
following procedures, simply put the watch down and do not
perform any button operation for two or three minutes. This
will cause the watch to enter the Timekeeping Mode (indicated
by normal one-second movement of the second hand)
To manually reset the second hand to
automatically. After that, you can try performing the manual
setting procedure again from the beginning.
the top of the minute
■
AM
10:08 a.m.
Example: Current time is
AA
AA
A button
hold down the
for about five seconds
until the second hand
stops at AM or PM.
1. In the Timekeeping Mode,
button operation for about two
or three minutes, the watch
will exit the manual setting
mode and normal hand
movement will resume.
• If you do not perform any
— 6 —
AA
AA
A button six times.
Timekeeping Mode, press
the
move to the current time, and
resume normal movement.
• This will cause the hands to
3. To return to the
8
g
To recover from the sleep state
■
Move the watch to a brightly lit location, press any button, or raise
the watch to your eyes for viewing (see “To illuminate the face with
the auto light switch”). The hands will move to the current time
setting and resume timekeeping from there.
Power Saving
BB
BB
B button to
Press the
increase the one’s digit
setting by one.
9.
How the sleep state works
Power Saving puts the watch into a sleep state, which will cause the second hand to stop moving whenever the watch is left in the dark.
• Note that hand movement may stop if the watch is blocked from light by your sleeve.
■
normally.
Sleep Level 1
The second hand stops 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 hour and minute hand, and the date continue to operate
• The alarm operates normally.
Sleep Level 2
AA
AA
A button to
Press the
return to the Timekeeping
Mode.
• This will cause the hands to
10.
stopped.
If the watch is left in the dark for an additional six or seven days,
the hour and minute hands, and the date indicator also stop.
• Auto time calibration is not performed.
• The alarm does not sound.
• Timekeeping continues internally even when the hands are
move to the current time, and
resume normal movement.
1
month lengths. The date will change automatically when the
current time reaches midnight. The date change at the end of the
month may take more time than normal.
• The watch automatically makes adjustments for leap years and
it)
s di
’
Year (one
3
2
4
5
BB
BB
B button to
Press the
increase the ten’s digit
setting by one.
the range of 2000 to 2099.
• You can set the year within
7.
AA
AA
A button.
Press the
.
0
the one’s digit of the year
setting.
• The second hand will move to
6
7
8
9
— 7 —
3. DRAWINGS: MODULE QW-3721
3-1. CIRCUIT DIAGRAM
TCO
P12
Asel Pon P3-2 Hold P14
✽13
✽13
ANT
Crh1
Crh2
Crh3
Crl1
Crl2
✽13
Crl3
✽14✽14
✽14
GND4
FET-D
Xtal2
Ccp
Xtal3
Rcp
P9
VCC
P13
✽15
ISB
P1
P2
Cc
✽13
P7
GND1
FET-S
Cxt
✽12 ✽13
GND5
P3-1 P4 P5
GND3 GND2
Cbat
Rbat
✽15
✽15
✽ 10. LD4 (Normal Low) is used in this module.
✽ 11. XT_DVR is used in this module.
✽ 12. Cxt is not mounted in the specification for dual
transmitters.
✽ 13. Cc, Crl1, Crl2, Crl3, Rxt3 and Xtal3 are not mounted in
the specification for single transmitter.
✽ 14. Soldering short pad. (Short after tuning antenna.)
✽ 15. Any one of VCC, P3-1 and P3-2 should be wired to
Rbat and Cbat since their terminals are wired inside
ISB.
An.B1
An.B3
An.B2
✽1
✽1 ✽1
SDA SCL SCUT
✽1✽1
✽1
LS1 LS2 LCS
✽1
LC1 - - LC3
✽1
L1 - - - - - L8 L9 - - L17
✽1
O4 O5 O6
O3
O1 O2
T1T2T3
AC
KC5
✽11
✽1
Tr3
RPM
KC4
KC2
KC3
KC1
✽8
✽9
✽10
VPM
PM_RES1
✽1
LSI
TOTAL 74PINS
BONDING 49PINS
✽3
✽3
EMP ✽3
R1
R2
✽4✽4✽4
✽3
R3
✽3
✽3
✽3
KI4
KI2
KI3
KI1
KI5
KI6
KI7
T4
S1
S2
SK
KI8
✽6
✽2
✽2
KS
RP1RP2
XTB
Xtal
SCR
CG
SCIN
Cp
VDD1
✽1 ✽1 ✽1✽1
VDSPVC3 VC4
C4
VCH VC1 VC2
C5
VHF
C6
LL1
Tr1
BAT
C7
C8
PZZ
SC
✽ 1. No bonding
✽ 2. GND-KI6: Short (Soldering)
GND-KI7: Open (No Soldering)
✽ 3. Latch type key
LL2
COILB
LED2
LED1
Rld1
Rld2
1LEDOUT
BD
R1
Di2
GND VDD2
Di1
GND1
VSC
✽7
XT
LD1
Mount Rb close by the tip.
✽ 4. Short (Soldering) (R trimming)
✽ 5. GNDB is used for the bias on the back of the tip.
✽ 6. Inclination sensor
✽ 7. Normal Low
✽ 8. LD2 (Normal High) is used in this module.
✽ 9. LD3 (Normal Low) is used in this module.
Cld1
Dild1
CE276CE1
VDD8
(N.C.)A
(N.C.)9
VOUT0
LED
2(N.C.)
3GND
DRIVER
4(N.C.)
Cld2
5ENABLE
— 8 —
✽5
GNDB
Rb
3-2. CHECKING TERMINALS AND COMPONENTS
KI4
GND KI5
GND
VSC
VSC
VDD2
KI2
O1
VC4
VC3
VOUT
GNDVC3
9. PCB ASS'Y
GND
SCR
SCIN
GND
GNDB
KI5
KI2
VSC
AC
GND
GND
LL1
(76408256)
KI1
LL1
Tr1
VDD2
VDD2
LL1
Tr1
RPM
VPM
P5P7
GND
P4
P5P7
1.05MAX.
P7
VCH
KI3
BD
LEDOUT
GND
GND
GND
LD1
CE1
Tr1
LD1
GNDGND
O6
KC1
O5
Vcc
FET-S'
FET-S P1
VDD2
FET-S'
Ccp
P1'
P1'
Coil
GND
VOUT
GND
VDD2
CE2
P1'
FET-S'FET-S'
P2'
P2'P2'P2'
P2'
P2
Short pad for switching modules
LEDOUT LED2
VDD2
GND
KI6
GND
KI7
Vcc
VDD2
P2
FET-D
Ccp
LEDOUT
VOUT
GND
LED1
VOUT
LED2
GND
R2
R3
R1
GND
GND
O1
O3
Short pad for R trimming
KI4
SENSOR/TILT
(71055275)
VDD2
KI7
VCH
LED1
VDD2
GND
O6
XTB
O5
GND
XT
XT
LL1
P9
VOUT
GND
VHF
Coil
CE1
Coil
CE2
VOUT
KI5
GND
O1
O2
SHEET/INSULATION 3721
GND
(10172630)
VSC
TAPE/ADHESIVE 2306
KI2
(10006652)
GND
OSCILLATOR/CRYSTAL
(10008260)
— 9 —
4. EXPLODED VIEW: MODULE QW-3721
6 (10172615)
17 (10169534)
Casing parts: DIAL
Casing parts: SPACER
Casing parts: DIAL SUPPORTER
1 (76408219)
5 (10195754)
12 (10123230)
12 (10123230)
10 (10137168)
10 (10137168)
11 (10137169)
11 (10137169)
3 (10172616)
21 (72270294)
4 (10172619)
2 (10135068)
Battery storage (CTL1025)
16 (72301000)
14 (10135066)
18 (10169533)
20 (10169526)
9 (76408256)
PCB Ass'y
7 (10140782)
22 (10165772)
Casing parts: SOLAR CELL
— 10 —
5. PARTS LIST: MODULE QW-3721
-
p
y
Note: 1. Prices and specifications are subject to change without prior notice.
2. Spare parts are classified as follows according to their importance in after-sales service.
A Rank ---------------------------------------- Very Important
B Rank ---------------------------------------- Important
C Rank ---------------------------------------
3. Batteries in Bulk pack on the tray will be supplied from our Overseas Spare Parts Section under charge basis.
Batteries in Blister pack will be supplied from our Sales Department.
4. As for order/supply of spare parts, refer to the separate publication "GUIDE BOOK for spare parts supply".
Less important
Item Code No. Parts Name S
76408221 MODULE/WITH MOVEMENT QW-3721YC-02TK OCW-100TDJ-1A 1 A
1 76408219 ANALOG BLOCK QW-3721MV-83TK QW-3721YC-02TK 1 A
2 10135068 BATTERY/STORAGE CTL1025 QW-3721YC-02TK 1 B
3 10172616 CONTACT/BATTERY (+) 3721 RJQ519936-001V02 QW-3721YC-02TK 1 C
4 10172619 CUSHION 3707-1 RJQ521249-002V01 QW-3721YC-02TK 1 C
5 10195754 CUSHION 3707-2 RJQ524197-001V03 QW-3721YC-02TK 1 C
6 10172615 HOLDER 3721 RJQ519902-001V01 QW-3721YC-02TK 1 C
7 10140782 LABEL 2815 RJQ517198-001V02 QW-3721YC-02TK 1 C
8 10008260 OSCILLATOR/CRYSTAL CFS-145JK07 QW-3721YC-02TK 1 B
9 76408256 PCB ASS'Y RJQ521705*001V01TK QW-3721YC-02TK 1 A
10 10137168 PLATE/TERMINAL 2787-1 RJQ515398-001V02 QW-3721YC-02TK 2 C
11 10137169 PLATE/TERMINAL 2787-2 RJQ515399-001V02 QW-3721YC-02TK 2 C
12 10123230 SCREW/FLAT2730 RJQ513792-001V01 QW-3721YC-02TK 4 B
13 71055275 SENSOR/TILT TS-2418-P QW-3721YC-02TK 1 B
14 10135066 SHEET/INSULATION 3315-3 RJQ515074-001V01 QW-3721YC-02TK 1 C
15 10172630 SHEET/INSULATION 3721 RJQ520957-001V01 QW-3721YC-02TK 1 C
16 72301000 SPRING/COIL 1604 Q458175A-1 QW-3721YC-02TK 1 B
17 10169534 SPRING/COIL 3707 RJQ521069-001V01 QW-3721YC-02TK 2 B
18 10169533 SPRING/LEAF 3707 RJQ520528-001V02 QW-3721YC-02TK 1 C
19 10006652 TAPE/ADHESIVE 2306 Q465964-1 QW-3721YC-02TK 1 C
20 10169526 TAPE/ADHESIVE 3707 RJQ521248-001V01 QW-3721YC-02TK 1 C
21 72270294 WASHER/745 Q436294A-1 QW-3721YC-02TK 1 C
22 10165772 WHEEL/HOUR 3721 RJQ519790-001V01 QW-3721YC-02TK 1 C
ecification Applicable Q R
OCW-110TDJ-1A
For the prices and minimum order/suppl
Notes: Q - Used quantity
R - Rank
quantities of the above parts, refer to the Parts Price List P.P.L.-623.
— 11 —
6. PRECAUTIONS FOR REPAIR: MODULE QW-3721
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE
1. Perform AC (ALL CLEAR) when inserting a new battery, or else the memories and/ or counters may give
erratic displays.
Touch the AC contact and the main plate with the metallic tweezers.
The contact should be made for about two seconds.
2. On removing of the module from the case, please insert the precision screw driver between the module
and the case pointed by arrows.
Note:After performing AC(ALL CLEAR), the mode is switched to the second hand movement accuracy
check mode at the home position adjustment mode.
Metallic tweezers
6-2. ACCURACY CHECKING
1. Module confirmation mode
1) While pressing A button, press B button twice at the normal timekeeping mode.
2) Confirm that the second hand points at 1 o’clock.
3) Press A button at the module confirmation mode to enter the normal timekeeping mode.
2. Accuracy checking mode
1) Press B button at the module confirmation mode to enter the accuracy checking mode.
2) Second hand shows performing to test the rate of clock.
3) Press A button at the Accuracy checking mode to go back to the normal timekeeping mode.
Normal timekeeping mode
A+B
A
B
A
×
2
Module confirmation mode
B
Accuracy checking mode
— 12 —
6-3. SOLAR CELL-PCB ASS'Y CONTACT CHECKING
1) Press B button at the accuracy checking mode, referring to page 10 to enter the solar cell-PCB
ass’y contact mode.
2) Check a Solar cell and PCB ass’y contact by the second hand.
3) Press A button at the solar cell-PCB ass’y contact mode, to go back to the normal timekeeping mode.
Contrasting Second hand position
Bright position at 40 sec
Dark position at 55 sec
6-4. TIME CALIBRATION SIGNAL TEST MODE
1) While pressing A button, press B button twice to enter the time calibration mode at Receive Result
Mode.
2) Press A button or B button to start signal reception. The second hand represents the result of the
signal reception.
* While the signal reception, second hand drives normally.
3) While the signal reception, pressing A button, B button, or A button and B button at the same
time switches to the normal setting.
Signal recieving department Start signal reception
JJY40 B 1 o’clock 11 o’clock
JJY60 A 2 o’clock 10 o’clock
The result of the signal reception
Success failure
The result of the signal reception
A
B
2
Time calibration signal test mode
A or B
Start signal reception
A+B
A or B
Normal timekeeping mode
×
A+B
6-5. SECOND HAND MOVEMENT ACCURACY CHECK MODE
1) While pressing A button, press B button twice at the hand setting mode to enter the second hand
movement accuracy check mode at Home Position Adjustment Mode.
2) Press A or B button to start testing.
3) While testing, pressing A or B button stops testing.
4) Pressing A button and B button at the same time, or pressing A button at the date function
accuracy check mode switches to the normal timekeeping mode.
Hand setting
×
A+B
2
A
B
Hand movement accuracy
check mode
A
Second hand continuance
movement accuracy check
B
Date function accuracy
check mode
A or B
A+B
A
Stop testing
Normal timekeeping mode
— 13 —
7. TROUBLESHOOTING: MODULE QW-3721
This is a flow chart about signal reception.
START
Check whether the Home City
code is selected correctly.
To perform MANUAL time
calibration signal reception
Signal
reception OK?
No
To perform AUTO time
calibration signal reception
Signal
reception OK?
No
Replace the PCB ass'y
Signal
reception OK?
Yes
OK
Yes
OK
Yes
OK
No
There is a possibility of location bad.
— 14 —
Ver. 1 : Jun. 2010
Correction of page 10
CASIO COMPUTER CO.,LTD.
Overseas Service Division
Shibuya-ku, Tokyo 151-8543, Japan
6-2, Hon-machi 1-Chome
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