Casio QW-2387 Troubleshooting guide

SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-2387
MODULE NO.
R
REF. NO. S/M-748
AUG. 2001
G-200

CONTENTS
Page
1. SPECIFICATIONS: QW-2387........................................................................ 1
2. OPERATION CHART: QW-2387................................................................... 2
3. DRAWINGS: QW-2387
3-1. LCD DIAGRAM ................................................................................................. 4
3-2. CIRCUIT DIAGRAM .......................................................................................... 5
3-3. CHECKING TERMINALS AND COMPONENTS .............................................. 6
4. EXPLODED VIEW: QW-2387........................................................................ 7
5. PARTS LIST: QW-2387................................................................................. 8
6. EXPLODED VIEW: ANALOG BLOCK OF QW-2387 ................................... 9
7. PARTS LIST: ANALOG BLOCK OF QW-2387 .......................................... 10
8. PRECAUTIONS FOR REPAIR: QW-2387
8-1. AC (ALL CLEAR) AND REMOVING OF MODULE ........................................ 11
8-2. ACCURACY CHECKING ................................................................................ 11

— 1 —
1. SPECIFICATIONS: QW-2387
Battery CR2016
Battery life Approx. 3 years
Current consumption 1.13 µA maximum
Alarm system Piezo plate on Back cover
Accuracy ±15 sec./month
Accuracy setting system Trimer capacitor
Accuracy checking See page 11
Functions: • Shock resistant (G-SHOCK)
• "ANTIMAGNETIC" watch (ISO)*
• LED light
• Dual time
• 1/100-sec stopwatch
Measuring capacity: 23:59'59.99"
Measuring unit: 1/100-sec (for the first 60 min)
1-sec (after 60 min)
Measuring mode: Elapsed time
• Daily alarm
• Auto-calendar ( to year 2039)
• 12/24-hour formats
• Regular timekeeping
Analog: 2 hands (Hr, min)
Digital: Hr, min, sec, pm, month, date, day
*Though this watch is designed to withstand exposure to magnetic force,
you should still keep it away from machinery and appliances that gener-
ate a strong magnetic field.
Exposure to strong magnetism can cause timekeeping to slow, affecting
timekeeping accuracy.
Item Detail

— 2 —
2. OPERATION CHART: QW-2387
GENERAL GUIDE
•Press Cto change from mode to mode.
•In any mode (except when making any settings), press Lto illuminate the display.
Calendar Mode Timekeeping Mode
Alarm Mode Stopwatch Mode Dual Time Mode
Press C.
CALENDAR MODE
To set the date
Day
Year
Month
1.In the Calendar Mode, hold down Bfor about two seconds, until “ADJ” and then
the year digits flash on the display. Keep Bdepressed until the year digits flash.
2.While any setting is selected (flashing), press Cto increase it. Holding down C
changes the flashing setting at high speed.
3.Press Bto move the selection around the display in the above sequence.
•The day of the week is automatically set in accordance with the date.
•The date can be set with the range of January 1,1995 to December 31, 2039.
•If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Calendar Mode automatically.
Month
Day
Day of week
Hold down B. Press B.
Press B.
Press B.
TIMEKEEPING MODE
The minutes hand advances 1/3 of a minute each time the second’s count in the
digital display reaches 00, 20 and 40 seconds.
To set the digital time
Seconds
12/24
Hour
Minutes
1.In the Timekeeping Mode, hold down Bfor about two seconds, until “ADJ” and
then the second’s digits flash on the display. Keep Bdepressed until the second’s
digits flash.
2.While the second’s digits are selected (flashing), press Cto reset the seconds to
00. If you press Cwhile the second’s count is in the range of 30 to 59, the sec-
onds are reset to 00 and 1 is added to the minutes. If the second’s count is in the
range of 00 to 29, the minute’s count is unchanged.
3.Press Bto move the selection around the display in the above sequence.
4.While hour or minutes are selected (flashing), press Cto increase the setting.
Holding down Cchanges the current setting at high speed. While the 12/24-hour
setting is selected, press Cto switch between the two formats.
•If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Timekeeping Mode automatically.
Hand setting
Each press of Aadvances the hands 20 seconds. Holding down Aadvances the
hands at high speed.
•Note that the hands can be advanced only and cannot be moved back. Take care
so you do not go past the setting you want to make.
Hold down B.
Press B.
Press B.
PM indicator
Hour
Minutes
Seconds
Press B.
Press B.
ALARM MODE
Hour
Minutes
When an alarm is turned on, an alarm tone sounds for 20 seconds at the preset time
each day.
To set the alarm time
1.In the Alarm Mode, hold down Bfor about two seconds, until “ADJ” and then the
hour digits flash on the display. Keep Bdepressed until the hour digits flash.
2.Press Cto increase the setting. Holding down Cchanges the current setting at
high speed.
3.Press Bto change the selection in the above sequence.
•The format (12-hour and 24-hour) of the alarm time matches the format you select
for normal timekeeping.
•When setting the alarm time using the 12-hour format, take care to set the time
correctly as morning or afternoon.
•If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Alarm Mode automatically.
•The alarm is turned on automatically whenever you change the alarm time setting.
To stop the alarm
Press any button to stop the alarm after it starts to sound.
To switch the daily alarm on and off
In the Alarm Mode, press Bto turn the daily alarm on and off.
ON
Press
B.
OFF
To test the alarm
Hold down Cwhile in any mode to sound the alarm.
ABOUT THE BACKLIGHT
In any mode (except when making any settings), press Lto illuminate the display
for about two seconds.
•The backlight of this watch illuminates both the digital display and analog face.
•The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
•The backlight automatically stops illuminating whenever an alarm sounds.
•Frequent use of the backlight shortens battery life.
Hour
Mode indicator Minutes
Hold down B.
Press B.
Press B.
STOPWATCH MODE
The Stopwatch Mode lets you measure elapsed time. The
range of the stopwatch is 23 hours, 59 minutes 59 sec-
onds. The measuring unit for the first hour of elapsed
time measurement is 1/100-second. After that the unit is
one second.
To measure elapsed time
1.Press Bto start the stopwatch.
2.Press Bagain to stop the stopwatch.
•You can repeat steps 1 and 2 as many times as you
want.
3.To reset the stopwatch time to all zeros, hold down B.
Mode indicator
Minutes
Seconds
1/100 seconds After the first hour
Minutes Seconds
Hour

— 3 —
DUAL TIME MODE
The Dual Time Mode lets you keep track of the time in another time zone.
To set the Dual Time
Hour
Minutes
Hour Mode indicator
Seconds
Minutes
Hold down B.
Press B.
Press B.
1.In the Dual Time Mode, hold down Bfor about two seconds, until “ADJ” and then
the hour digits flash on the display. Keep Bdepressed until the hour digits flash.
2.Press Cto increase the setting. Holding down Cchanges the current setting at
high speed.
3.Press Bto move the selection around the display in the above sequence.
•The format (12-hour and 24-hour) of the Dual Time matches the format you select
for normal timekeeping.
•The second’s count is synchronized with the second’s count in the Timekeeping
Mode.
•If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Dual Time Mode automatically.

— 4 —
3. DRAWINGS: QW-2387
3-1. LCD DIAGRAM
SEG. COM.
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
LC1
(DT0)
c0
d0
i0
c1
d1
i1
DT1
ST1
d5
d2
e2
(k2)
LC2
(ST0)
b0
g0
e0
k0
b1
g1
e1
k1
c2
g2
f2
(j2)
LC3
(AL0)
(i3)
a0
f0
j0
d3
a1
f1
j1
b2
a2
d4
(h2)
LC4
hyp
col1
(j3)
(h3)
a3
b3
P
f5
a5
b5
f4
a4
b4
LC5
col0
(k3)
e3
h0
f3
g3
c3
h1
AL1
e5
g5
c5
e4
g4
c4
L27 L26 L25 L24 L23 L22 L21 L20 L19 L18 L17 L16 L15 L14 L13 L12 LC5 LC4 LC3 LC2 LC1
a5
b5
c5
d5
e5 f5
g5
h1
i1
j1
k1
h0 a0
b0
c0
e0
d0
g0
f0
j0
k0
i0
a1
b1
c1
d1
e1 f1
g1
a2
b2
c2
d2
e2 f2
g2
a3
b3
c3
d3
e3 f3
g3
a4
b4
c4
d4
e4 f4
g4
Pcol1
hyp
col0
AL1 ST1 DT1

— 5 —
3-2. CIRCUIT DIAGRAM
LSI
TOTAL 68PINS
BONDING 51PINS
VSS2
BAT
KI7
KI5
KI6
KI1
KI2
KI3
VCH VSS3 VC1 VC2
C1
C3C4
XTB
N2
Xtal
LC1 - - - - LC5
CT
LCD
LD2
N1 S1
KI8
KI4
S3
VSS1
C2
BD
C5
PZ
LL1
Tr1
N3
XT
+
N4
VDD
AC
T1
L12 - - - L27,
S4
LD1
LD3
O1
O2
An.B
✽1
✽2
Open (No Soldering)
Terminal L
No bonding
Short (Soldering)
Not used
✽1
✽2
✽3
✽4
✽5
L1 - - L11 28 - - 31
✽3
LD4
VPM
T2
✽3
S2
✽4
✽5
✽5
Tr2
R1 R2 R3
LED1
LED2
✽3

— 6 —
3-3. CHECKING TERMINALS AND COMPONENTS
Top view of P.C.B. ass’y Bottom view of P.C.B. ass’y
KI3
O1
O2
ANO4
CATH
CATH ANO3
KI5
KI8
VDD VDD
N1 N2
VDD VDD
N3 N4
VDD VDD
KI7 KI6
ANO2CATHANO1
ANO1
ANO2
KI2
ANO3
VDD
VDD
VDD VDD
XT
XTB
VDD
XT
VDD
VDD
VDD
VDD
VDD
VDD
CATH
ANO4
VDD
VDD
VCH
VC1
VC1
VSS3
VSS2
VSS1
VCH
VC2
L
L
LVSS2
BD
L
VSS2
LD2
LD2
VDD
KI1
KI5
KI5 LD1
LD1
VDD
KI4 O2 O1 KI2
CATH
VSS2
VSS2
VSS2
KI2
KI3
AC
KI4KI4
LD1
KI1
4. Capacitor/Trimmer
(1001 0950)
CT
10. Cushion/6
(7211 0064)
9. Cushion/506
(7211 9631)
Capacitor/Chip
C2
Capacitor/Chip
C3
Capacitor/Chip
C4
Capacitor/Chip
C1
Capacitor/Tantalum
C5
Coil
LL1
LED
LED2
Transistor
Tr2
3a.PCB ass'y
(7640 4665)
Transistor
Tr1
Resistor/Chip
R1
Resistor/Chip
R3
Resistor/Chip
R2
5.Oscillator/Crystal
(7110 0693)
Xtal

— 7 —
(CR2016)
Battery Lithium
PCB ass'y
3a (7640 4665)
3b (7640 4728)
8 (7218 0438)
12 (1005 3621)
18 (7229 0772)
7 (1002 7903)
10 (7211 0064)
11 (7231 1962)
13 (1005 3617)
16 (1005 3615)
2 (1005 3616)
6 (7640 4662)
16 (1005 3615)
17 (7201 9464)
9 (7211 9631)
15 (7227 0350)
20 (1005 3614)
14 (1005 3618)
1 (1003 6046)
19 (7224 0652)
4. EXPLODED VIEW: QW-2387

5. PARTS LIST: QW-2387
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 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
7640 4689 MODULE/WITH MOVEMENT QW-2387AT-01TK G-200-1EV/2EV 1A
G-200D-1EV
G-200L-2B/3B
7640 4748 MODULE/WITH MOVEMENT QW-2387AT-02TK G-200L-1B/4B 1 A
1 1003 6046 LCD S2327-01TF QW-2387AT Common 1 A
2 1005 3616 LED UNIT RLB-2387-RE QW-2387AT Common 1 B
3a 7640 4665 PCB ASS'Y Q255150*1TK QW-2387AT-01TK 1 A
3b 7640 4728 PCB ASS'Y Q255150*2TK QW-2387AT-02TK 1 A
4 1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P QW-2387AT Common 1 B
5 7110 0693 OSCILLATOR/CRYSTAL DT-26SJ QW-2387AT Common 1 B
6 7640 4662 ANALOG BLOCK Q254190*2TK QW-2387AT Common 1 A
7 1002 7903 CONTACT/BATTERY(-) 156 Q39603B-1 QW-2387AT Common 1 C
8 7218 0438 CUSHION 524 Q411459-1 QW-2387AT Common 2 C
9 7211 9631 CUSHION/506 Q49364-1 QW-2387AT Common 1 C
10 7211 0064 CUSHION/6 Q4914-1 QW-2387AT Common 1 C
11 7231 1962 HOLDER/HOUR WHEEL Q364830-1 QW-2387AT Common 1 C
12 1005 3621 INTERCONNECTOR Q468360-1 QW-2387AT Common 1 C
13 1005 3617 LIGHT GUIDE WD5-2387-01 QW-2387AT Common 1 C
14 1005 3618 REFLECTOR WH-2387-01 QW-2387AT Common 1 C
15 7227 0350 SCREW/1325-3 Q452678A-1 QW-2387AT Common 1 C
16 1005 3615 SPRING/COIL 2387-1 Q468363-1 QW-2387AT Common 3 B
17 7201 9464 SPRING/COIL 914-B Q426688-1 QW-2387AT Common 1 B
18 7229 0772 TAPE/ADHESIVE Q458267-1 QW-2387AT Common 1 C
19 7224 0652 WASHER Q421691-1 QW-2387AT Common 1 C
20 1005 3614 WHEEL/HOUR Q369119-1 QW-2387AT Common 1 B
BATTERY/LITHIUM CR2016 QW-2387AT Common 1
For the prices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-574.
Notes: Q – Used quantity
R – Rank — 8 —

— 9 —
6. EXPLODED VIEW: ANALOG BLOCK OF QW-2387
36-7 (7235 0350)
66-8 (7235 0336)
6-4 (7227 0273) 9
6-6 (7235 0532) 5
6-1 (7235 0916) 8
6-3 (7640 2423) 4
6-2 (1000 5728) 7
6-5 (7235 0364) 2
1
9~ 1: Disassemble order
1~ 9: Reassemble order

7. PARTS LIST: ANALOG BLOCK OF QW-2387
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 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
6 7640 4662 ANALOG BLOCK Q254190*2TK QW-2387AT Common 1 A
6-1 7235 0916 BRIDGE/TRAIN WHEEL Q254021-1 QW-2387AT Common 1 C
6-2 1000 5728 COIL ASSY Q366109*1 QW-2387AT Common 1 A
6-3 7640 2423 ROTOR/1301 Q340980*2TK QW-2387AT Common 1 B
6-4 7227 0273 SCREW/1300-1 Q436969A-1 QW-2387AT Common 2 C
6-5 7235 0364 STATOR/1301 Q340977A-1 QW-2387AT Common 1 C
6-6 7235 0532 WHEEL/CANNON PINION Q350682A-1 QW-2387AT Common 1 C
6-7 7235 0350 WHEEL/MINUTE 1301 Q340983A-1 QW-2387AT Common 1 B
6-8 7235 0336 WHEEL/THIRD 1301 Q340981A-1 QW-2387AT Common 1 B
For the prices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-574.
Notes: Q – Used quantity
R – Rank — 10 —

— 11 —
8. PRECAUTIONS FOR REPAIR: QW-2387
8-1. 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 positive (+) side of the battery or 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 an arrow.
8-2. 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 Bbutton, press Cbutton twice at the calendar 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 except for Bbutton.
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-2387
AC
Metallic tweezers
B
L
A
C

CASIO TECHNO CO.,LTD.
Overseas Service Division
Nishi-Shinjuku Kimuraya Bldg. 1F
5-25, Nishi-Shinjuku 7-Chome
Shinjuku-ku, Tokyo 160-0023, Japan