Page 1
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-808
APR. 2003
MODULE NO.
QW-2741
WVA-310DQ
R
(WITHOUT PRICE)
Page 2
CONTENTS
1. SPECIFICATIONS: MODULE QW-2741 .................................................... 1
2. DRAWINGS: MODULE QW-2741
2-1. LCD DIAGRAM ............................................................................................. 2
2-2. CIRCUIT DIAGRAM ...................................................................................... 3
2-3. CHECKING TERMINALS AND COMPONENTS .......................................... 4
2-4. P1 ~ P5 PADS ...............................................................................................4
3. EXPLODED VIEW: MODULE QW-2741 .................................................... 5
4. PARTS LIST: MODULE QW-2741 ............................................................. 6
5. PRECAUTIONS FOR REPAIR: MODULE QW-2741
5-1. AC (ALL CLEAR) AND REMOVING OF MODULE ...................................... 7
5-2. ACCURACY CHECKING .............................................................................. 7
6. TROUBLESHOOTING FOR TIME RECEPTION: MODULE QW-2741 ..... 8
Page 3
1. SPECIFICATIONS: MODULE QW-2741
Item Detail
Battery CTL1616 (Storage battery)
Note: Use CTL1616 only. Other storage battery or CR1616 can cause
damage to the watch.
Battery life Approx. 6 month (from full charged condition)
Current consumption 0.548 µA maximum
Alarm system Piezo plate on Cover/Back
Accuracy ±15 sec./month
Accuracy setting system Trimmer capacitor
Accuracy checking See page 7
Functions • Electro-luminescent backlight
Afterglow
• Solar powered
• Time calibration signal reception
Auto receive (Twice a day, at 2:00 AM, 4:00 AM)
Manual receive
Last date/time received display
• Time Calibration Signal
Station name: JJY (Fukuoka/Saga, Japan)
Frequency: 60 kHz
Range: Approx. 1,000 km
• 20 Telememo pages
8 letters and 12 numbers per page
Others: Auto-sort, remaining memory
• World Time
29 time zones (28 cities), daylight saving time on/off
• Day Counter
Automatically counts down the days from the current date to a target date.
Memory capacity: 5records (8 characters of text)
• 1/100-sec. stopwatch
Measuring capacity: 23:59’59.99"
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:
Analog: 2 hands (Hr, min.)
Digital: Hr, min, sec, pm, month, date, day
— 1 —
Page 4
2. DRAWINGS: MODULE QW-2741
2-1. LCD DIAGRAM
L1L2L3L4L5L6L7L8L9
PM
24H
DST
ALM
SIG
SEG.
COM.
L 1
L 2
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
L22
L23
L24
L25
L26
L27
L28
SDS
L10
L11
L12
L13
L14
L15
a3
f3
b3
g3
e3
c3
d3
X0 X18
LC1
BAT0
X0Y4
X1Y4
X2Y4
X3Y4
X4Y4
DST
e3
d3
c3
e2
d2
c2
X5Y4
X6Y4
X7Y4
X8Y4
X9Y4
X18Y4
X17Y4
X16Y4
X15Y4
X14Y4
X13Y4
X12Y4
X11Y4
X10Y4
e2
CHARGE
f2
g2
d2
X18Y3
X17Y3
X16Y3
X15Y3
X14Y3
X13Y3
X12Y3
X11Y3
X10Y3
a2
b2
c2
BAT0 BAT1
LC2
BAT1
X0Y3
X1Y3
X2Y3
X3Y3
X4Y3
c0
d0
e0
c1
d1
e1
COL
X5Y3
X6Y3
X7Y3
X8Y3
X9Y3
ANT2
L16
HYP
L17
COL
X0Y2
X1Y2
X2Y2
X3Y2
X4Y2
X5Y2
X6Y2
X7Y2
X8Y2
X9Y2
X18Y2
X17Y2
X16Y2
X15Y2
X14Y2
X13Y2
X12Y2
X11Y2
X10Y2
ANT1
L18
LC3
ALM
b0
g0
f0
b1
g1
f1
HYP
L19
a1
f1 b1
g1
e1
d1
L20
c1
X18Y1
X17Y1
X16Y1
X15Y1
X14Y1
X13Y1
X12Y1
X11Y1
X10Y1
L21
LC4
SIG
X0Y1
X1Y1
X2Y1
X3Y1
X4Y1
PM
a0
a3
a1
a2
X5Y1
X6Y1
X7Y1
X8Y1
X9Y1
ANT0
L22
f0
e0
L23
L24
a0
b0
g0
c0
d0
RECOVER
RECOVER
L25
ANT2
Y4
Y0
LC5
X0Y0
X1Y0
X2Y0
X3Y0
X4Y0
24H
f3
g3
b3
f2
g2
b2
X5Y0
X6Y0
X7Y0
X8Y0
X9Y0
X18Y0
X17Y0
X16Y0
X15Y0
X14Y0
X13Y0
X12Y0
X11Y0
X10Y0
L26
L27
L28
SDC
CHARGE
SDS
SDC
ANT1
ANT0
LC1
LC2
LC3
LC4
LC5
— 2 —
Page 5
2-2. CIRCUIT DIAGRAM
✽ 1. No bonding
✽ 2. Short (Soldering) (Switching function)
KI6: Open (No Soldering)
KI7: Open (No Soldering)
KI8: Open (No Soldering)
✽ 3. Latch T ype Key
✽ 4. Short (Soldering)
✽ 5. Inclination sensor
Not mounted in this module.
✽ 6. Normal High for LD1
✽ 7. GNDB is used for the bias on the back of the tip.
✽ 8. Rant1 is not mounted in this module.
LSI
TOTAL 123PINS
BONDING 81PINS
LCD (2.8V 1/3b 1/5d)
INV
IC
L1 L28
L29 L61
LC1 LC5 SDS SDC
✽1 ✽1 ✽1 ✽1
GND VDD2
BAT
VCH VDD3
VC1 VC2
C1
C3C5
XTB
Xtal1
CT
LD1
S1
S2
S3
VDD1
C2
BD1
C8
LL1
Tr1
XT
T1
T2
T3
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KI8
KI9
EMP ✽3
S4
SCR
SCIN
RP1RP2
Cp
PZ
VDSP
C4
VC3 VC4
Di1
V_TQ
C7
SDA SCL SCUT
AC
T4
D0
KC4
KC3
KC22
KC1
R1
R2
VSC
C6
SC
C9
CLF1
E’
Cel
EL
LL2
L+
VOUT
L-
GND
CLF2
V+
BACK
FRONT
✽4
✽4
SL
PON
O1
O2
O4
O3
✽1
✽1
✽1
✽8
T5
R3
✽4
LD2
✽1
✽3
✽3
✽3
✽3
✽3
✽3
✽1
VC5 VC6
✽1 ✽1
Z
SK
VPM
RPM
1
Xtal2
ANT
Rxt2
Di2
R1
An.B
KS
✽5
Rb
GNDB
✽7
Rpd
Crh2
Crh1
Crh0
Rant2
Rant1
Creg
Cf12
Cagc
Cf13
Ccp9
Rcp
Cxt
Rxt1
Rbat
Cbat
Crh3
✽2
✽2
✽2
16
2
15
3
14
4
13
5
12
6
11
7
10
8
IN1
IN2
VCC
OUT1
OUT2
GND
REC
DEC1
REG
PON
AGC
FIL1
FIL2
TCO
HOLD
DEC2
9
— 3 —
Page 6
2-3. CHECKING TERMINALS AND COMPONENTS
Capacitor/Chip
Cbat
Capacitor/Chip
Ccp9
Resistor/Chip
Rpd
Resistor/Chip
Rbat
Capacitor/Chip
Cf12
Resistor/Chip
Rcp
Capacitor/Chip
Cf13
Capacitor/Chip
Cagc
Capacitor/Chip
Creg
L21
LC2LC1
L23
L22
2
GNDB
L24
INV
KI9
O2
GND
GND
L26
L25
EMP
T5
R3
KC4 KC3
L27
Resistor/
Chip
Inverter
Coil
LL2
GND
KC1
L+
O1
GND
GND
V+(VDD2)
R1
R2
CLF2CLF1
R3
L28
LC4
LC3
LC2
LC1
SDS
SDC
BD1
VPM
SL
VOUT
PON
O2
D0
SCIN
T1
SCR
T2T4
T3
R2
R1
VOUT
CLF1
Varistor
Z
L-
GNDL+L-
KI4
LD1
CLF2
LD1
VSC
LC5
KI1
Rant2
16
14
13
12
GND
GND
9
R6
GND
DO
GND
KI2
GND
GND
GND
VPM
KI2
VC3
GND
GND
V_TQ
VC4
VDSP
GND
L1
L3
KI3
L2
VC1
VC2
VDD3
VDD1
V_TQ
VC3
VC4
GND
VDD2
VDD2
L4
XTB
GND
GND
R6
3
3
KI8
KI8
GND
KI7
GND
VDD2
KI6
GND
GND
GND
GND
VDD1
VDD3
L5
L9L8L7
L6
L11
L10
VDD2
XT
KI2
AC
3. PCB ASS'Y
VDSP
(7640 6705)
KI5
KI6
KI8
KI7
VCH
L13
L12
KI9
16
16
1
L20
L19
L18
L17
L16
L15
L14
LC3
LC5 LC4
9. Cushion/506
(7211 9631)
Transistor
Tr1
Coil
LL1
Di2
R1
VDD2
R1
VDD2
R1
L
R1
02
GND
KI4
L
GND
L
L
VDD2
LD1
VDD2
KI1
VDD2
VOUT
VSC
VSC
VSC
GND
SCIN
SCIN
SCIN
Diode
Resistor/
Chip
Rxt1
KC1
KC1
KI9
BD1
GND
GND
GND
SCR
KC3
Detection IC
IC
Rxt2
Resistor/
Chip
GND
GNDB
GND
Resistor/Chip
Oscillator/Crystal
Xtal2
Capacitor/Chip
C5
Cxt
12
GND
16
197
R4
R7
AC
VDSP
KC4
Capacitor/
Chip
D0SL121314
3
8
542PON
GND
4
R7
R4
VC2
1
VC
XTB
XT
XT
VCHKI9
D0
7
KI2
7
5
GND
VCH
VC1
KI3
ND
G
Capacitor/Chip
C2
Capacitor/Chip
C3
Capacitor/Chip
C7
Capacitor/Chip
C8
Capacitor/Chip
C4
Capacitor/Chip
C6
Resistor/Chip
RPM
Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y
2-4. P1 ~ P5 PADS
Never solder or desolder these pads, because they have been selected best in the production line.
A new PCB ass'y as a spare parts will be supplied with factory adjustment of these pads.
Di1
Capacitor/
Cel
Chip
Cp
Capacitor/Chip
C9
Diode
RP2
Resistor/Chip
RP1
Capacitor/Chip
— 4 —
Resistor/
Rb
Chip
Resistor/
Chip
C1
4. Capacitor/Trimmer
CT
(1001 0950)
5. Oscillator/Crystal
Xtal1
(7110 6323)
24. Tape/Adhesive
(7229 0789)
Capacitor/Chip
Page 7
3. EXPLODED VIEW: MODULE QW-2741
11 (1006 5660)
26 (7224 0652)
27 (1005 4633)
6 (7640 5041)
17 (7640 5483)
25 (7209 9263)
20 (1003 0983)
1 (1009 4073)
18 (1006 5661)
19 (1001 4294)
13 (1006 5662)
6-2 (7227 0273)
6-1 (1006 2535)
6-2 (7227 0273)
20 (1003 0983)
2 (1006 5665)
19 (1001 4294)
3 (7640 6705)
PCB ass'y
12 (1008 3194)
14 (1006 5664)
8 (1001 6598)
21 (1006 5663)
7 (1006 5657)
Battery Storage (CTL1616)
10 (7231 1777)
15 (7227 0252)
16 (7227 0415)
22 (7201 9599)
23 (1006 5659)
— 5 —
Page 8
4. PARTS LIST: QW-2741
-
p
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".
Item Code No. Parts Name Specification Applicable Q R
Less important
1009 6137
1009 4073
1
1006 5665
2
7640 6705 PCB ASS'Y Q255946*1TK QW-2741YCSA-01 1 A
3
1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P QW-2741YCSA-01 1 B
4
7110 6323 OSCILLATOR/CRYSTAL DT-26S11 QW-2741YCSA-01 1 B
5
7640 5041 ANALOG BLOCK QW-2368MV-82TK QW-2741YCSA-01 1 A
6
1006 2535 COIL ASS'Y Q369124*1 QW-2741YCSA-01 1 B
6-1
7227 0273 SCREW/1300-1 Q436969A-1 QW-2741YCSA-01 2 B
6-2
1006 5657 BATTERY/STORAGE CTL1616 QW-2741YCSA-01 1 B
7
1001 6598 CONTACT/BATTERY(-) Q366836-1 QW-2741YCSA-01 1 C
8
7211 9631 CUSHION/506 Q49364-1 QW-2741YCSA-01 2 C
9
7231 1777 HOLDER 1381 Q456843-1 QW-2741YCSA-01 1 C
10
1006 5660 HOLDER 2368 Q255111A-1 QW-2741YCSA-01 1 C
11
1008 3194 HOLDER/BATTERY Q255199C-2 QW-2741YCSA-01 1 C
12
1006 5662 INTERCONNECTOR Q468267-1 QW-2741YCSA-01 1 C
13
1006 5664 LABEL 2368 Q468543A-1 QW-2741YCSA-01 1 C
14
7227 0252 SCREW Q431332-1 QW-2741YCSA-01 1 B
15
7227 0415 SCREW/TAPPING Q450646B-1 QW-2741YCSA-01 1 B
16
7640 5483 SOLAR ASS'Y Q370513*1TK QW-2741YCSA-01 1 C
17
1006 5661 SPACER Q369365-1 QW-2741YCSA-01 1 C
18
19 1001 4294 SPRING/COIL Q466513A-1 QW-2741YCSA-01 2 B
20 1003 0983 SPRING/COIL 2362-1 Q467328A-1 QW-2741YCSA-01 2 B
21 1006 5663 SPRING/COIL 2368 Q468519-1 QW-2741YCSA-01 1 B
22 7201 9599 SPRING/COIL 967-1 Q430081-1 QW-2741YCSA-01 1 B
23 1006 5659 SUPPORTER/PCB ASS'Y Q152109B-1 QW-2741YCSA-01 1 C
24 7229 0789 TAPE/ADHESIVE Q462101-1 QW-2741YCSA-01 1 C
25 7209 9263 TAPE/ADHESIVE 658-B Q428127-1 QW-2741YCSA-01 2 C
26 7224 0652 WASHER Q421691-1 QW-2741YCSA-01 1 C
27 1005 4633 WHEEL/HOUR Q350681D-2 QW-2741YCSA-01 1 C
MODULE/WITH MOVEMENT QW-2741YCSA-01 WVA-310DQ-1A/2A
LCD C2740-01 QW-2741YCSA-01
EL YEL-2368-A-01 QW-2741YCSA-01
1A
1A
1A
For the
Notes: Q - Used quantity
rices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-593.
R - Rank
— 6 —
Page 9
5. PRECAUTIONS FOR REPAIR: MODULE QW-2741
5-1. 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.
5-2. 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 A and C buttons at the normal timekeeping mode.
Then all the segments are displayed and the LCD drive signals are changed to the static drive signal
of “32 Hz” so that you can check the accuracy with the quartz timer.
B) CANCELLATION OF THE “ACCURACY CHECKING MODE”
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.
— 7 —
A
C
B
D
QW-2741
Page 10
6. TROUBLESHOOTING FOR TIME RECEPTION: MODULE QW-2741
This is a flow chart about signal reception.
START
Check whether the Home City
code is selected correctly.
Perform MANUAL time
calibration signal reception
Signal
reception OK?
No
Perform AUTO time
calibration signal reception
Signal
reception OK?
No
Replace the PCB ass'y
Signal
reception OK?
Yes
OK
Yes
OK
Yes
OK
There is a possibility of the bad location for reception.
See "Time calibration Signal Reception Precautions."
No
Replace the Case center
ass'y with antenna
Signal
reception OK?
No
— 8 —
Yes
OK
Page 11
CASIO TECHNO CO.,LTD.
Overseas Service Division
Shibuya-ku, Tokyo 151-8543, Japan
6-2, Hon-machi 1-Chome
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