Casio QW-2228 Troubleshooting guide

(WITHOUT PRICE)
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-718
NOVEMBER 2000
QW-2228
MODULE NO.
R
BG-540PP

- 1 -
CONTENTS
1. SPECIFICATIONS : QW-2228
1. SPECIFICATIONS • • • • • • • • • • • • • • • • • • • • • • • • • • 1
2. OPERATION CHART • • • • • • • • • • • • • • • • • • • • • • • • 2
3. DRAWINGS • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 3
3-1. BLOCK DIAGRAM • • • • • • • • • • • • • • • • • • • • • • • • 3
3-2. CHECKING TERMINALS AND COMPONENTS• • • • 4
4. EXPLODED VIEW • • • • • • • • • • • • • • • • • • • • • • • • • • 5
5. PARTS LIST • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 6
6. PRECAUTIONS FOR REPAIR • • • • • • • • • • • • • • • • • • 7
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE • • 7
6-2. ACCURACY CHECKING • • • • • • • • • • • • • • • • • • • 7
Item Detail Item Detail
Battery CR1616 Accuracy ±15sec./month
Battery life Approx. 24 months Accuracy setting system Trimmer capacitor
Current consumption 1.28 µA maximum Accuracy checking See page 7
Alarm system Piezo plate on Back cover Accuracy setting +0.25~+0.35sec./day
Function
• Shock resistant
• Electro-luminescent backlight
Afterglow
• 1/100-second stopwatch
Measuring capacity: 59'59.99"
Measuring modes: Elapsed time, split time, 1st-2nd place times
• Daily alarm
• Hourly time signal
• Auto-calendar (to year 2039)
• 12/24-hour formats 
• Regular timekeeping: Hour, minutes, seconds, am/pm, month, date, day, daylight saving on/off

- 2 -
2. OPERATION CHART : QW-2228
GENERAL GUIDE
Press to change from mode to mode.
Timekeeping Mode Alarm Mode Stopwatch Mode
Press .
TIMEKEEPING MODE
Hour : Minutes
Seconds
DST on indicator
Month - Day Day of week
PM indicator
In the Timekeeping Mode, press to switch between the 12-hour and 24-hour
format.
When the 12-hour format is selected, “p.m.” times are indicated on the display by P,
while “a.m.” time are indicated by A. No indicators are used with the 24-hour for-
mat.
In the Timekeeping Mode, press to switch between the month-day/day of the
week display and day of the week/day/Gmark display.
Setting the Time and Date
There are two different ways to set the time and date. The procedure you should use
depends on whether you want to make major changes or minor changes to the cur-
rent setting.
ABOUT THE BACKLIGHT
In any mode, press to illuminate the display for about 4 seconds. If you turn on
the backlight in the Timekeeping Mode, the figures on the display disappear for
about the final two seconds the backlight is on.
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.
About the animation display
Turning on the backlight in any mode (except when a setting screen is on the dis-
play) causes one of 72 different animated figures to appear on the display. The
figure that appears depends on when you press the backlight button.
ALARM MODE
When the Daily Alarm is turned on, an alarm sounds for
20 seconds at the preset time each day. When the Hourly
Time Signal is turned on, the watch beeps every hour on
the hour.
If you do not operate any button for a few minutes while
in the Alarm Mode, the watch goes back to the Time-
keeping Mode automatically.
To set the alarm time
1.Hold down until the hour digits start to flash on the
display. The hour digits flash because they are
selected .
At this time the Alarm is automatically turned on.
2.Press to change the selection in the following se-
quence.
Hour Minutes
To make major time and date settings
1.Hold down until the seconds digits start to flash.
2.Press to move the selection around the display in the following sequence.
DST on/off
Seconds
Day
Hour
Year
Month Minutes
3.While the seconds digits are selected (flashing), press to reset them to 00. If
you press while the seconds count is in the range of 30 to 59, they are reset to
00 and 1 is added to the minutes. If the seconds count is in the range of 00 to 29,
the minutes count is unchanged.
4.While the DST setting is selected (DST on indicator is flashing), press to toggle
it on (on) and off (OF).
5.While any other digits (besides seconds), are selected (flashing), press to in-
crease the number. Holding down changes the digits at high speed.
The date can be set with the range of January 1, 2000 to December 31, 2039.
6.After you set the time and date, press to return to 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 Timekeeping Mode automatically.
The day of the week is automatically set in accordance with the date.
The watch’s built-in full automatic calendar automatically makes allowances for
different 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.
To zero-reset the minutes and seconds (EASY ADJUST)
1.Hold down and at the same time on which you want to zero-reset the min-
utes and seconds arrives.
The watch beeps to let you know that the minutes and seconds were reset to 00 00.
If you press and while the minutes count is in the range of 30 to 59, they are
reset to 00 and 1 is added to the hour. If the minutes count is in the range of 00 to
29, the hour count is unchanged.
2.Release buttons and .
Though the beep may sound slightly after the point you press both buttons, the
zero-reset setting should be correct.
When you want to do this:
Make major changes to the time and
date setting (before using the watch
for the first time, after having the bat-
tery replaced, etc.)
Make minor adjustments (within about
30 minutes of the current setting) to
the time setting
Use this procedure:
“Tomake majortime anddate settings”
“ To zero-reset the minutes and seconds
(EASY ADJUST
)”
Mode indicator
Hour : Minutes
Alarm on indicator
Hourly time signal
on indicator
Current time
Mode indicator
1/100
second
Minutes
Seconds
Current time
3.Press to increase the number. Holding down changes the digits at high
speed.
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.
4.After you set the alarm time, press to return to the Alarm 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 Alarm Mode automatically.
To stop the alarm
Press any button to stop the alarm after it starts to sound.
To turn the Daily Alarm and Hourly Time Signal on and off
Press while 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
Hold down while in the Alarm Mode to sound the alarm.
STOPWATCH MODE
The Stopwatch Mode lets you measure elapsed time, split
times, and two finishes. The range of the stopwatch is 59
minutes, 59.99 seconds.
If you do not operate any button for a few minutes while
the all-zero screen is on the display in the Stopwatch
Mode, the watch goes back to the Timekeeping Mode
automatically.
Press .
(a) Elapsed time measurement
Start Stop Re-start Stop Clear
Start Split Split release Stop Clear
Start Split Stop Split release Clear
(b) Split time measurement
(c) Split time and 1st-2nd place times
First runner
finishes. Second runner finishes.
Record time of 
first runner.
Record time of
second runner.
C
C
C
C
D D
D
D
D
D
D
D
D
D
L
B
B
D
B
D
B
B
B
A
A
A
A
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

- 3 -
3. DRAWINGS : QW-2228
3-1. BLOCK DIAGRAM
1
Xtal
CT
LD2
BAT
KI1
KI2
2
KI3
KI4
LD1
LD3
VSS2
L27L1
VCH VSS3
LSI
LCD
TOTAL
BONDING 59PINS 58PINS
VC1 XTB XTVC2
BD
C1
C4
VDD
C8
C7
C6
VSS1
C2
C3
C5+
S1
S2
S3
SA
S4
KI5
KI6
T
AC
KI7
KI8
N1
N2
N3
N4
LL2 PZ
Tr LC1 LC5
2
1. No bonding.
2. KI6: Open (No soldering)
KI7: Open (No soldering)
ELD
OUT1
OUT2
VCC
CIL RT1 RT
LL1
IN1
IN2
RT2
GND
INV
EL1
R1
R2
FRONTMIDDLE
BACKMIDDLE
EL2
Di
SEG. COM.
LC1 LC2 LC3 LC4 LC5
L 1 a9
h8
a8
PM
x0y2
e5
c5
AM
x0y6
g9
c9
d8
e9
x0y4
h9
b9
g8
f9
x0y3
c6b6
i9
f5
b5
d9
x0y5
x1y2 x1y6x1y4x1y3 x1y5
x2y2 x2y6x2y4x2y3 x2y5
x3y2 x3y6x3y4x3y3 x3y5
x4y2 x4y6x4y4x4y3 x4y5
x5y2 x5y6x5y4x5y3 x5y5
x6y2 x6y6x6y4x6y3 x6y5
x6y1 c0a0x6y0 b0
x5y1 d0f0x5y0 g0
x4y1 e0a1x4y0 b1
x3y1 c1f1x3y0 g1
x2y1 d1MINOx2y0 e1
x1y1 DSTa2x1y0 b2
x0y1 c2f2x0y0 g2
SPL d2e2
a6 c3d6g6 b3
f6
SIG
a7
d3
e3
COL0
a3
c7
d7
e6
b7
g7 BARe7f7 c4b4
g3
f3
MIN1
HYP d4a4COL1 g4
c8b8ALM e4f4
f8 d5a5e8 g5
L 2
L 3
L 4
L 5
L 6
L 7
L 8
L 9
L 10
L 11
L 12
L 13
L 14
L 15
L 16
L 17
L 18
L 19
L 20
L 21
L 22
L 23
L 24
L 25
L 26
L 27
ALM SIG SPL
BAR
DST
AM
PM
y6
a9
d9
g9
f9
h9
i9
b9
c9
e9
a8
h8
HYP
COL1
COL0
MIN1 MIN0
d8
g8
f8
b8
c8
e8
a7
d7
g7
f7
b7
c7
e7
a6
d6
g6
f6
b6
c6
e6
a5
d5
g5
f5
b5
c5
e5
a4
d4
g4
f4
b4
c4
e4
a3
d3
g3
f3
b3
c3
e3
a2 a1
d2 d1
g2 g1
f2
f1
b2
b1
c2
c1
e2
e1
a0
d0
g0
f0
b0
c0
e0
y0 x0 x6
L1L27
L26 L25 L24 L23 L22 L21 L20 L19 L18 L17 L16 L15 L14 L13 L12
L2 L3 L4 L5 L6 L7 L8 L9
L10 L11
LC1 LC2 LC3 LC4 LC5

- 4 -
3-2. CHECKING TERMINALS AND COMPONENTS : QW-2228
Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y
KI8 KI8
VDD
VDD
VDD
VDD
VDD
CIL
ELD
VDD
OUT1
OUT2
RT1
RT2
N1
N2
VSS2
VCH VCH
L
L
L
KI1
KI1
KI3 KI3
KI2
KI4
KI2
KI4
LD1
RT1
VC1 LD3
VDDN1
VDDN2
VDDN3
VDDN4
VDD
VDD
VDD
VDD KI5
KI7
KI6
ELD
OUT1
OUT2 VDD
ELD
ELD
ELD
ELD
CIL
OUT2
OUT2
OUT1
OUT1
VSS2
VSS2
VSS2
VSS2
RT2 IN1
IN2 VSS1
VSS2
VSS3
XT
XT
VDD
VDD
AC
XTB
VDD
VSS2
BD
VC1
VC2
3 .PCB ass'y
(7640 3930)
Resistor / Chip
R2
Resistor / Chip
R1
Resistor / Chip
RT
Diode
Di
Transistor
Tr
Capacitor /
Tantalum
C5
4 .Capacitor / Trimmer
(7103 0458)
CT
7 .Cushion 506 
(7211 9631)

7 .Cushion 506 
(7211 9631)

8 .Cushion 6 
(7211 0064)

Xtal
5 .Oscillator / Crystal 
(7110 6309)
C4
Capacitor / Chip
C1
Capacitor / Chip
C6
Capacitor /
Chip
C3
Capacitor / Chip
C7
Capacitor / Chip
C8
Capacitor / Chip
C2
Capacitor / Chip
LL2
Coil
LL1
Coil
Inverter
INV

- 5 -
6 (7236 0292)
12 (7230 0616)
9 (7010 4683)
3 (7640 3930)
PCB ass'y
2a (1003 3953)
2b (1003 3954)
2c (1003 3955)
2d (1003 3959)
13 (7230 1063)
Battery / Lithium (CR1616)
1 (1003 3952)
11 (7233 2796)
4. EXPLODED VIEW : QW-2228
10 (7233 2734)
12 (7230 0616)

- 6 -
5. PARTS LIST : QW-2228
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 Bulkpackonthe tray will be supplied from our OverseasSpare Parts Section under charge basis.
Batteries in Brister pack will be supplied from our Sales Department.
4. As for order/supply of spare parts, refer to the separate publication “GUIDEBOOK for spare parts supply”.
Notes: Q – Used quantity
R – Rank
Item Code No. Parts name Specification Applicable Q R
7640 3962 MODULE/WITHOUT MOVEMENT QW-2228YC-01TK BG-540PP-2 1 A
7640 3963 MODULE/WITHOUT MOVEMENT QW-2228YC-02TK BG-540PP-4 1 A
7640 3964 MODULE/WITHOUT MOVEMENT QW-2228YC-03TK BG-540PP-5 1 A
7640 3965 MODULE/WITHOUT MOVEMENT QW-2228YC-04TK BG-540PP-6 1 A
1 1003 3952 LCD C2228-01P QW-2228YC-01/02/03/04 1 A
2a 1003 3953 EL MEL-2134-BH-01 QW-2228YC-01 1 A
2b 1003 3954 EL MEL-2134-BI-01 QW-2228YC-02 1 A
2c 1003 3955 EL MEL-2134-BJ-01 QW-2228YC-03 1 A
2d 1003 3959 EL MEL-2134-BK-01 QW-2228YC-04 1 A
3 7640 3930 PCB ASS'Y Q254838*1TK QW-2228YC-01/02/03/04 1 A
4 7103 0458 CAPACITOR/TRIMMER TSF-2L2-120-4.2 QW-2228YC-01/02/03/04 1 B
5 7110 6309 OSCILLATOR/CRYSTAL DT-26S13 QW-2228YC-01/02/03/04 1 B
6 7236 0292 CONTACT/BATTERY (-) 1828 Q359948C-3 QW-2228YC-01/02/03/04 1 C
7 7211 9631 CUSHION/506 Q49364-1 QW-2228YC-01/02/03/04 2 C
8 7211 0064 CUSHION/6 Q4914-1 QW-2228YC-01/02/03/04 1 C
9 7010 4683 INTERCONNECTOR/2134 Q464806-1 QW-2228YC-01/02/03/04 2 C
10 7233 2734 SHEET/INSULATION 2050 Q464001-1 QW-2228YC-01/02/03/04 1 C
11 7233 2796 SPACER/2134 Q464805-1 QW-2228YC-01/02/03/04 1 C
12 7230 0616 SPRING/COIL 1199-1 Q437728B-1 QW-2228YC-01/02/03/04 3 B
13 7230 1063 SPRING/COIL 2134 Q464985-1 QW-2228YC-01/02/03/04 1 B
BATTERY/LITHIUM CR1616 QW-2228YC-01/02/03/04 1
* For the price, new parts and minimum quantity of the above parts, please refer to the Parts Price List P.P.L.-564.

- 7 -
6. PRECAUTIONS FOR REPAIR : QW-2228
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 positive (+) side of the battery or main plate with the metallic tweezers.
The contact should be made for about two seconds.
For 2 seconds after the AC operation, do not make any button operations on these modules.
2.On removing of the module from the case, please insert the precision screw driver between the module
and the case pointed by arrows.
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 the D button, press the A and C buttons, 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"
Press any button except for D 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.
Metallic tweezers

Nishi - Shinjuku Kimuraya Bldg. 1F
5-25, Nishi-Shinjuku 7-Chome
Shinjuku
- ku , Tokyo 160-0023 , Japan
Printed in Japan
Overseas Service Division
CASIO TECHNO CO.,LTD.
EI1100601A