Casio QW-2741, WVA-300KQ Service Manual
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-808
APR. 2003
MODULE NO.
QW-2741
WVA-310DQ
R
(WITHOUT PRICE)
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
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 —
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 —
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