Casio G-2400 Troubleshooting guide

SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-2223
MODULE NO.
R
REF. NO. S/M-710
SEP. 2000
G-2400

— 1 —
1. SPECIFICATIONS: QW-2223
Battery CR2016
Battery life Approx. 2 years
Current consumption 1.57 µA maximum
Alarm system Piezo plate on Back cover
Accuracy ±15 sec./month
Accuracy setting system Trimmer capacitor
Accuracy checking See page 10
Functions
Item Detail
•Shock resistant (G-SHOCK)
•Electro-luminescent backlight
Auto light switch, afterglow
•World time
Current time in 27 cities (29 time zones), city code display, daylight
saving on/off
• 1/100-second stopwatch
Measuring capacity: 99:59'59''
Measuring modes: Elapsed time, lap/split time
Memory capacity: 500 lap/split time records with lap/split number
• Daily alarm
• Hourly time signal
• Auto-calender (to year 2039)
• 12/24-hour formats
• Regular timekeeping: Hour, min, sec, pm, month, date, day
CONTENTS
Page
1. SPECIFICATIONS: QW-2223..................................................................... 1
2. OPERATION CHART: QW-2223................................................................ 2
3. DRAWINGS: QW-2223
3-1. BLOCK DIAGRAMS ........................................................................... 5
3-2. CHECKING TERMINALS AND COMPONENT .................................. 7
4. EXPLODED VIEW: QW-2223..................................................................... 8
5. PARTS LIST: QW-2223.............................................................................. 9
6. PRECAUTIONS FOR REPAIR: QW-2223
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE........................... 10
6-2. ACCURACY CHECKING ................................................................... 10

— 2 —
2. OPERATION CHART: QW-2223
GENERAL GUIDE
•Press Cto change from mode to mode.
•Pressing Lin any mode (except Stopwatch Mode) illuminates the display for about 2 seconds.
•Pressing Din the Stopwatch Mode illuminates the display for about 2 seconds.
•If you do not perform any operation for a few minutes while a setting screen (with flashing digits) is on the display, the watch automatically exits the setting screen.
Timekeeping Mode Stopwatch Mode Recall Mode World Time Mode Alarm Mode
Press C.
TIMEKEEPING MODE
•With 12-hour timekeeping, times between noon and mid-
night are indicated by P(pm), while no indicator appears
for times between midnight and noon.
•No indicator appears for any time while 24-hour time-
keeping is selected.
To set the time and date
1.While in the Timekeeping Mode, hold down Auntil the
seconds digits flash on the display, indicating the set-
ting screen.
2.Press Cto move the flashing in the sequence shown below.
DST
Seconds
Month
Day
City code
Minutes
Year
Hour
12/24
3.While the seconds setting is selected (flashing), press Dto reset it to 00. If you
press Dwhile the seconds setting is in the range of 30 to 59, the seconds are
reset to 00 and 1 is added to the minutes. If the seconds setting is in the range of
00 to 29, the minutes count is unchanged.
•This watch lets you select one of 27 city codes as your home time city.
•Note that if you want to change your home time city, you must change the city code
first, and then change the DST∗setting.
•While the DST setting is selected, press Dto toggle it on ( ) and off ( ).
•The DST on/off setting you make for the city code that is currently selected in the
Timekeeping Mode (your home time city) is also applied to that city code in the
World Time Mode.
•While the city codes setting is selected, use D(+) and B(–) to scroll through the
available codes until the one you want to use as your home time city is displayed.
•For full information on city codes, see the “CITY CODE TABLE”.
•While the 12/24-hour setting is selected, press Dto toggle it between 12 and 24.
•While any other setting is selected (flashing), press D(+) or B(–) to change it.
Holding down either button changes the setting at high speed.
4.After you make the settings you want, press Ato exit the setting screen.
•The day of the week is automatically set in accordance with the date.
•The date can be set within the range of January 1, 2000 to December 31, 2039.
•The watch’s built-in full automatic calendar automatically makes allowances for dif-
ferent month lengths and leap years. Once you set the date, there should be no
reason to change it except after the replacement of the watch’s battery.
∗Daylight Saving Time (DST), which is also sometimes called “summer time” ad-
vances the time for one hour, as is the custom in some areas during the summer.
Remember that not all countries or even local areas use Daylight Saving Time.
ABOUT THE BACKLIGHT
•Pressing Lin any mode (except Stopwatch Mode) illuminates the display for about
2 seconds.
•Pressing Din the Stopwatch Mode illuminates the display for about 2 seconds.
•The backlight of this watch employs an electro-luminescent (EL) light, which loses
its illuminating power after very long term use.
•Frequent use of the backlight shortens the battery life.
•The watch emits an audible sound whenever the display is illuminated. This does
not indicate malfunction of the watch.
•The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
•The backlight automatically turns off whenever an alarm sounds.
Hour
Minutes Seconds
DST on indicator
Day
Month
Day of week
PM indicator
STOPWATCH MODE
About Laps and Splits
Lap Times
A lap time is the amount of time it takes for you to get from one point to
another during a race. When running on a track, for example, you can time
how long it takes you to complete each lap.
Split Times
A split time is the time from the start of a race until the point that the split is
measured. For example, you could measure split times to determine how
long it takes for you to get from the starting line to the 5-kilometer mark, the
10-kilometer mark, etc.
The Stopwatch Mode lets you measure elapsed time, lap
times, and split times. The range of stopwatch is 99 hours,
59 minutes, 59 seconds. You can use the EL backlight by
pressing Dat any time while the stopwatch is operating.
The Stopwatch Mode also lets you store the lap times for
multiple laps in memory for later recall when you need
them.
This watch manages data according to RUN, which are
made up of multiple data records. All data stored from the
start of the stopwatch operation to the end of the stop-
watch operation makes up one RUN. Within a RUN, each
lap/split operation stores one record. The watch can hold
up to 500 data records in memory.
The final time recorded when you stop the stopwatch op-
eration is recorded as the final lap time.
The first hour of a stopwatch operation is measured in units of 1/100 second. After
that, elapsed time is measured in units of one second.
Minutes
Seconds
1/100 second
[Up to 1 hour] [After 1 hour]
Split time
Lap time
Hours
Minutes
Seconds
Split time
Lap time
<Example 1>
The following operation causes one RUN, which consists of three data records, to be
stored into memory.
Start 1 set 1 set
1 RUN
1 set Stop and
Clear
1st
Lap/Split
Data storedData storedData stored
2nd
Lap/Split
<Example 2>
If you do not perform a lap/split operation, the RUN is made up of a single data
record.
Start 1 set = 1 RUN
Data stored
Stop and
Clear
To measure elapsed time
1.Press Lto start the stopwatch.
2.Press Bto stop the stopwatch.
•You can resume the elapsed time measurement operation by pressing Lagain.
•You can stop the elapsed time measurement operation by pressing Bagain.
3.While the elapsed time is stopped on the display, press Bto clear the stopwatch
to all zeros.
Mode indicator
Minutes
Seconds
1/100 second
RUN number

— 3 —
To measure lap and split times
1.Press Lto start the stopwatch.
2.Press L, the split time and lap time for the lap whose time you just measured
appears for about five seconds in the display. Stopwatch timing continues inter-
nally.
•After the above, the display automatically switches back to the normal stopwatch
(elapsed time) display. You can repeat the above step as many times as you like,
until 500 records are stored.
•When memory becomes full (after 500 records are stored), the next store operation
causes the message “FULL” to appear on the display. The watch does not record
the new data. Always check how much memory capacity you have left before you
start recording important time data.
(Though there are no way to display how much memory is left.)
3.Press Bto stop elapsed time measurement. The time on the display is stored as
the final lap time.
4.Press Bagain to reset the stopwatch to all zeros.
❈What you should do after you complete a RUN depends on what you want to do
with the data from the just-completed RUN, as described below.
To save the data of a just-completed RUN
After resetting the stopwatch to all zeros, hold down Buntil the RUN number in-
creases by one. This indicates that the next stopwatch operation will be stored as a
different RUN, leaving the data of the previous RUN in memory as well.
To delete the data of a just-completed RUN
You do not need to do anything. The next time you start a stopwatch operation, the
new RUN data will replace the data of the currently displayed RUN number.
To delete the data of a just-completed RUN and one RUN before it
While the stopwatch is reset to all zeros, hold down Auntil the RUN number de-
creases by one. The next time you start a stopwatch operation, the new RUN data
will replace the data of the currently displayed RUN number.
Deleting Data
Note that you can delete the data for the newest RUN only. If there is data for five
RUN in memory, for example, you could delete the data for RUN 5 only. Then you
could delete the data for RUN 4, RUN 3, and so on. You can use the Recall Mode to
delete all RUN data.
•Holding down Ain the Stopwatch Mode causes the RUN number to decrease by
one. The next time you start a stopwatch operation, the new RUN data will replace
the data of the currently displayed RUN number.
It may take a rather long time to perform delete or recall operations in the
Stopwatch Mode or Recall Mode when there is a lot of data stored in memory.
RECALL MODE
The Recall Mode is used to recall and delete data that is
stored by Stopwatch Mode operations.
Recalling Laps and Splits
1. In the Recall Mode, press Bto scroll throughRUN num-
bers, from the newest to the oldest (number 1). The
data includes the measurement date. (If the elapsed
time operation extends over two different days, only the
start date is recorded.)
Next
newest
RUN
Newest
RUN RUN 1
•RUN numbers are assigned automatically to each RUN,
in sequence with the oldest RUN being 1, the next old-
est 2, etc.
2.When the RUN number for the data you want to see is on the display, press Dto
switch to its Best Lap display. Now, each press of Dscrolls the data in lap/split
number sequence. Holding down Dscrolls at high speed.
Lap 2Lap 1
Best
Lap Final Lap
RUN No.
& date
•The watch can record up to 341 best laps. The data for any RUN after the 341st is
displayed without best lap data.
To delete all RUN data
Hold down Auntil the watch emits a beep and the message “CLR” flashes on the
display. That indicate the all of data is cleared.
•You cannot delete data for a particular record or RUN in the Recall Mode. You only
can delete all data currently stored in memory.
Important!
•You cannot delete data in the Recall Mode unless the stopwatch is reset to all
zeros. If it isn’t, enter the Stopwatch Mode, reset to all zeros, and then return to the
Recall Mode to delete the data.
ERROR Message
The message ERROR flashing on the display indicates that the battery is about
to go dead. When this happens, request battery replacement from your origi-
nal retailer or from an authorized CASIO distributor. You will not be able to
enter the Stopwatch Mode and Recall Mode while ERROR is flashing on the
display.
Mode indicator
RUN number
Measurement date
WORLD TIME MODE
The World Time Mode shows you the current time in 27
cities (30 time zones) around the world.
•For full information on city codes, see the “CITY CODE
TABLE”.
•The time setting of the Timekeeping Mode and the World
Time Mode are synchronized. Whenever you change
the time setting for any city in the Timekeeping Mode,
the settings of all World Time cities are changed ac-
cordingly.
The DST on/off setting, however, must be specified in-
dividually for each World Time city.
•The format (12-hour and 24-hour) of the World Time
matches the format you select for Timekeeping Mode.
To select a World Time City and view its time
In the World Time Mode, press D(+) or B(–) to scroll through the city codes (time
zones). Holding down either button scrolls at high speed.
Daylight Saving Time (DST)
Daylight Saving Time automatically advances the time setting by one hour from Stan-
dard Time. You can make individual Daylight Saving Time settings for each city code
(time zone). Remember that not all countries or even local areas use Daylight Saving
Time.
To switch between Standard Time and Daylight Saving Time
1.In the World Time Mode, use D(+) or B(–) to display the city code (time zone)
whose standard time/daylight saving time setting you want to change.
2.Hold down Ato toggle between Daylight Saving Time and Standard Time.
•The DST indicator appears on the display whenever you display a city code for
which daylight saving time is turned on.
ALARM MODE
Mode indicator
Hour : Minutes Alarm on indicator
Hourly time signal
on indicator
Current time
DST on indicator
When the Daily Alarm is turned on, the alarm sounds for 20 seconds at the preset
time each day. Press any button to stop the alarm after it starts to sound. When the
Hourly Time Signal is turned on, the watch beeps every hour on the hour.
To set the alarm time
1.Hold down Auntil the hour digits flash on the display, indicating the setting screen.
•At this time, the alarm is turned on automatically.
2.Press Cto move the flashing in the sequence shown below.
Hour Minutes
3.Use D(+) and B(–) to change the setting. Holding down either button changes
the setting at high speed.
4.After you set the alarm time, press Ato exit the setting screen.
•The format (12-hour and 24-hour) of the alarm time matches the format you select
in the Timekeeping Mode.
•When setting the alarm time using the 12-hour format, take care to set the time
correctly as morning or afternoon.
To stop the alarm
Press any button to stop the alarm after it starts to sound.
To turn the Daily Alarm or the Hourly Time Signal on and off
Press Dwhile in the Alarm Mode to change the status of the Daily Alarm and Hourly
Time Signal in the following sequence.
Hourly Time
Signal only
Daily Alarm
only
Both OFFBoth ON
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
•Holding down Dto test the alarm also changes the Daily Alarm and Hourly Time
Signal on/off settings.
City code World time
Current time of
your home time
DST on indicator

— 4 —
–11 - - - - - PAGO PAGO
–10 HNLHNL
HNLHNL
HNL HONOLULU PAPEETE
–9 ANCANC
ANCANC
ANC ANCHORAGE NOME
–8 LAXLAX
LAXLAX
LAX
LOS ANGELES
SAN FRANCISCO, LAS VEGAS,
VANCOUVER, SEATTLE, DAWSON CITY
–7 DENDEN
DENDEN
DEN DENVER EL PASO, EDMONTON
–6 CHICHI
CHICHI
CHI CHICAGO HOUSTON, DALLAS/FORT WORTH,
NEW ORLEANS, MEXICO CITY, WINNIPEG
–5 NYCNYC
NYCNYC
NYC NEW YORK MONTREAL, DETROIT, MIAMI, BOSTON,
PANAMA CITY, HAVANA, LIMA, BOGOTA
–4 CCSCCS
CCSCCS
CCS CARACAS LA PAZ, SANTIAGO, PORT OF SPAIN
–3 RIORIO
RIORIO
RIO
RIO DE JANEIRO
SAO PAULO, BUENOS AIRES, BRASILIA,
MONTEVIDEO
–2 - - - - -
–1 - - - - - PRAIA
+0 GMTGMT
GMTGMT
GMT
+0 LONLON
LONLON
LON LONDON DUBLIN, LISBON, CASABLANCA, DAKAR,
ABIDJAN
MILAN, ROME, MADRID, AMSTERDAM,
+1 PARPAR
PARPAR
PAR PARIS ALGIERS, HAMBURG, FRANKFURT, VIENNA,
STOCKHOLM, BERLIN
+2 CAICAI
CAICAI
CAI CAIRO ATHENS, HELSINKI, ISTANBUL, BEIRUT,
JRSJRS
JRSJRS
JRS JERUSALEM DAMASCUS, CAPE TOWN
+3 JEDJED
JEDJED
JED JEDDAH MOSCOW, KUWAIT, RIYADH, ADEN,
ADDIS ABABA, NAIROBI
+3.5 THRTHR
THRTHR
THR TEHRAN SHIRAZ
+4 DXBDXB
DXBDXB
DXB DUBAI ABU DHABI, MUSCAT
+4.5 KBLKBL
KBLKBL
KBL KABUL - -
+5 KHIKHI
KHIKHI
KHI KARACHI MALE
+5.5 DELDEL
DELDEL
DEL DELHI MUMBAI, CALCUTTA
+6 DACDAC
DACDAC
DAC DHAKA COLOMBO
+6.5 RGNRGN
RGNRGN
RGN YANGON - -
+7 BKKBKK
BKKBKK
BKK BANGKOK JAKARTA, PHNOM PENH, HANOI,
VIENTIANE
+8 HKGHKG
HKGHKG
HKG HONG KONG SINGAPORE, KUALA LUMPUR, BEIJING,
TAIPEI, MANILA, PERTH, ULAANBAATAR
+9 TYOTYO
TYOTYO
TYO TOKYO SEOUL, PYONGYANG
+9.5 ADLADL
ADLADL
ADL ADELAIDE DARWIN
+10 SYDSYD
SYDSYD
SYD SYDNEY MELBOURNE, GUAM, RABAUL
+11 NOUNOU
NOUNOU
NOU NOUMEA PORT VILA
+12 WLGWLG
WLGWLG
WLG WELLINGTON CHRISTCHURCH, NADI, NAURU ISLAND
CITY CODE TABLE
GMT City City Other major cities in the same time zone
differential Code
*Based on data as of December 1999.

— 5 —
3. DRAWINGS: QW-2223
3-1. BLOCK DIAGRAMS
L40 L41 L42 L43 L44 L45 L46 L47 L48 L49 L39 L38 L37 L36 L35 L34 L33
L15 L14 L13 L12 L11 L10
L 9 L 8 L 7 L 6 L 5
L16 L17 L18 L19 L20 L21 L22 L23 L24 L25 L26 L27 L28 L29 L30
L50 L51 L52 L53 L54
L31 L32
L55
L 4
L56
LC5 LC4 LC3 LC2 LC1
g5
SIG
a5
d5
e5 f5
b5
c5
g3
a3
d3
e3 f3
b3
c3
g2
a2
d2
e2 f2
b2
c2
g1
a1
d1
h1
j1
e1
i1
f1
b1
c1
g0
a0
d0
e0 f0
b0
c0
g4
a4
d4
e4 f4
b4
c4
hyp
h0
x26
ALMLAPSPL
SEC
DST1 MIN
y0
PM1
PM0
DST0
y0
AUTOEL
RECALL
y6
x0 x18 x19 x20
m0
m1
m2
m3
m4
y6
k3
y5
k4 k0
y0
y2
y3
y4
k2
k1 k8
k9 k5
k7
k6
COL
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
L28
L29
L30
L C 1
X1Y1
X0Y1
X0Y4
X1Y4
X2Y4
X3Y4
X4Y4
X5Y4
X6Y4
X7Y4
X8Y4
X9Y4
X10Y4
X11Y4
X12Y4
X13Y4
X14Y4
X15Y4
X16Y4
X17Y4
X18Y4
X19Y2
X20Y3
X21Y3
X22Y3
X23Y3
X24Y3
L C 2
X1Y0
X0Y0
X0Y5
X1Y5
X2Y5
X3Y5
X4Y5
X5Y5
X6Y5
X7Y5
X8Y5
X9Y5
X10Y5
X11Y5
X12Y5
X13Y5
X14Y5
X15Y5
X16Y5
X17Y5
X18Y5
X19Y3
X20Y4
X21Y4
X22Y4
X23Y4
X24Y4
L C 3
PM1
X0Y6
X1Y6
X2Y6
X3Y6
X4Y6
X5Y6
X6Y6
X7Y6
X8Y6
X9Y6
X10Y6
X11Y6
X12Y6
X13Y6
X14Y6
X15Y6
X16Y6
X17Y6
X18Y6
X19Y4
X20Y5
X21Y5
X22Y5
X23Y5
X24Y5
L C 4
d5
PM0
k4
k3
k2
k1
k0
DST0
k9
k8
k7
k6
k5
RECALL
m4
m3
m2
m1
m0
AUTOEL
X19Y5
X21Y6
X20Y6
X22Y6
X23Y6
X24Y6
L C 5
X1Y2
X0Y2
X0Y3
X1Y3
X2Y3
X3Y3
X4Y3
X5Y3
X6Y3
X7Y3
X8Y3
X9Y3
X10Y3
X11Y3
X12Y3
X13Y3
X14Y3
X15Y3
X16Y3
X17Y3
X18Y3
X19Y0
X20Y2
X21Y2
X22Y2
X23Y2
X24Y2
L31
L32
L33
L34
L35
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L46
L47
L48
L49
L50
L51
L52
L53
L54
L55
L56
L C 1
X25Y3
X26Y3
X26Y0
X25Y0
X24Y0
X23Y0
X22Y0
X21Y0
X20Y0
X18Y1
X17Y1
X16Y1
X15Y1
X14Y1
X13Y1
X12Y1
X11Y1
X10Y1
X9Y1
X8Y1
X7Y1
X6Y1
X5Y1
X4Y1
X3Y1
X2Y1
L C 2
X25Y4
X26Y4
SIG
a0
h0
ALM
a1
f1
h1
X18Y0
X17Y0
X16Y0
X15Y0
X14Y0
X13Y0
X12Y0
X11Y0
X10Y0
X9Y0
X8Y0
X7Y0
X6Y0
X5Y0
X4Y0
X3Y0
X2Y0
L C 3
X25Y5
X26Y5
b0
g0
f0
b1
g1
e1
l1
c2
g2
b2
SEC
a3
f3
g3
e3
LAPSPL
MIN
a4
f4
e4
DST1
a5
f5
e5
L C 4
X25Y6
X26Y6
c0
d0
e0
c1
d1
j1
d2
e2
f2
a2
b3
c3
d3
hyp
COL
b4
g4
c4
d4
b5
g5
c5
L C 5
X25Y2
X26Y2
X26Y1
X25Y1
X24Y1
X23Y1
X22Y1
X21Y1
X20Y1
X18Y2
X17Y2
X16Y2
X15Y2
X14Y2
X13Y2
X12Y2
X11Y2
X10Y2
X9Y2
X8Y2
X7Y2
X6Y2
X5Y2
X4Y2
X3Y2
X2Y2
COM.
SEG. COM. SEG.

— 6 —
TOTAL BONDING 129PINS
95PINS
LSI
LCD EEPROM
C6 C8 C4C7 C2 C3
C5
C1
Tr2
LL2
PZZ
BAT
C9
+
EL1
BACKFRONT
C11
Di
LL1 RMP
INV
RT
CT Xtal
KS
SK
✽2 ✽2 ✽2
S1
C10
Tr1
R3
L4AC
T1 T2 T3 T4 ✽1
✽1
KI1 KI2 KI3 KI4 KI8 KI5 KI6 EMP XTB XT LD1
VDD2A
KC6 KI7 KI9 KC1 KC2 KC3 KC5 KC4 ✽1
✽1 ✽1
✽1 L1~L3, L57~L60
L56 LC1 LC5 LC6
VCCE SCL SDA WP
SDI CSB
VSS
SDA
A2
SCL
A1
WP
A0
VCC
✽1✽1✽1PT
✽1PTIN
PX1
✽1
✽1
VANVC2VC1VC4VC3
BD1VDD2GNDGNDA VDD3VDD1VDSPVOSCVCHVHF
CRMS
✽1
CRST
✽1
CRIN
✽1✽1
PY1✽1
Vref✽1
PW1✽1
PY3✽1 PX3✽1
PU1✽1
PZ1✽1
PH✽1
LE✽1
ADIN✽1
A2OUT✽1
P0✽1
SDD SCK
SCUT
No bonding KI5 : Short (Soldering) KI6 : Short (Soldering) KI7 : Open (No soldering)
✽ 1. ✽ 2.
S2 S3 S4 SL
CIL ELD VCC OUT1 OUT2
GND
RT1 RT2
IN1 IN2

— 7 —
Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y
3-2. CHECKING TERMINALS AND COMPONENT
PCB WITH LSI
KC1
VHF
GND
GNDVDD1
VC2
GND
XT
GND
VCH
KI8
GND
VDD3VDD3
VC1
MP
KI9
VCH
AC
GND
VOSC
KI4
VDD2
VOSC
GND
VDD2
GND
GND GND
VDD2
VC1
KI1
KI2
KI3
KC1
SDO
SCK
VC4
WP
L
VCC
ELD
KI9
VDD2
GND
XTB
VCC
WP
L
GND
MP
VCH
GND
GND
GND
KI7
KI5
KI6
GNDVDSP
VCC
GND
GND
BD1
VDD2
L
SCUT
VCC
GND ELD RT1
RT2
VC3
VDD2
CIL
CIL
ELD
VDD2
GND
GND
GND
EMP MP
RT1
RT2
KC6
GND VDD2
ELD
SD0
SCK
WP
VCC
GND
GND
GND
GND
GND
CIL
GND
XT
Capacitor/Chip
C2 Capacitor/
Chip
C5 Capacitor/Chip
C1 Capacitor/Chip
C6 Capacitor/
Chip
C7 Capacitor/Chip
C3 Capacitor/Chip
Capacitor/
Tantalum
C9
Capacitor/Chip
Capacitor/Chip
Capacitor/Chip
C11
C10
Resistor/Chip
Resistor/
Chip
RT
Resistor/Chip
R3
Transistor
Tr1
RMP
Transistor
Tr2
Diode
CoilLL2
CoilLL1
7. Cushion/506
(7211 9631)
7. Cushion/506
(7211 9631)
Inverter
INV
Memory/
External
CT 4. Capacitor/Trimmer
(1001 0950)
Xtal
8. Cushion/6
(7211 0064)
5. Oscillator/Crystal
(7110 6323)
C4
Di
C8

— 8 —
4. EXPLODED VIEW: QW-2223
1 (1002 4518)
12 (1002 4512)
2 (1001 6311)
Battery/Lithium
(CR2016)
3 (7640 3596)
PCB ass'y
10 (1001 6309)
10 (1001 6309)
6 (7236 0286) 15 (7230 0497)
9 (7231 1952)
11 (7233 0952)
14 (7201 9249)
13 (7230 0616)

5. PARTS LIST: QW-2223
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 S
p
ecification A
pp
licable Q R
7640 3617 MODULE/WITHOUT MOVEMENT QW-2223AT-01TK G-2400-1V/2V 1 A
1 1002 4518 LCD C2223-01P QW-2223AT-01 1 A
2 1001 6311 EL YEL-2171-A-01 QW-2223AT-01 1 A
3 7640 3596 PCB ASS'Y Q254630*1TK QW-2223AT-01 1 A
4 1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P QW-2223AT-01 1 B
5 7110 6323 OSCILLATOR/CRYSTAL DT-26S11 QW-2223AT-01 1 B
6 7236 0286 CONTACT/BATTERY (–) 1650 Q357954C-1 QW-2223AT-01 1 C
7 7211 9631 CUSHION/506 Q49364-1 QW-2223AT-01 2 C
8 7211 0064 CUSHION/6 Q4914-1 QW-2223AT-01 1 C
9 7231 1952 HOLDER/BATTERY 2058 Q253743-1 QW-2223AT-01 1 C
10 1001 6309 INTERCONNECTOR/2171 Q466259-1 QW-2223AT-01 2 C
11 7233 0952 SHEET/INSULATION 1028 Q434476-1 QW-2223AT-01 1 C
12 1002 4512 SPACER/ 2171 Q466258-1 QW-2223AT-01 1 C
13 7230 0616 SPRING/COIL 1199-1 Q437728B-1 QW-2223AT-01 2 B
14 7201 9249 SPRING/COIL 675-3 Q413389A-1 QW-2223AT-01 1 B
15 7230 0497 SPRING/COIL 675-3 Q413389A-2 QW-2223AT-01 2 B
BATTERY/LITHIUM CR2016 QW-2223AT-01 1
For the
p
rices and minimum order/su
pp
l
y
q
uantities of the above
p
arts, refer to the Parts Price List P.P.L.-562.
Notes: Q – Used quantity
R – Rank — 9 —

— 10 —
6-2. 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 D button, press Aand Cbuttons at the normal time keeping 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”
Push any button except for Dbutton.
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.
6. PRECAUTIONS FOR REPAIR: QW-2223
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 negative (–) side of 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.
QW-2223
Metallic tweezers
AB
CD
L

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