Casio QW-2171 Troubleshooting guide

SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-2171
MODULE NO.
R
REF. NO. S/M-700
JUL. 2000
GM-100

— 1 —
1. SPECIFICATIONS: QW-2171
Battery CR2016
Battery life Approx. 1.5 years
Current consumption 4.705 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
•Day Countdown with 5 Memories
Automatically counts down the days from the current date to a target date.
A mark appears on the display to let you know when a target date is
reached.
• Free menos
5 independent free memos (up to 8 characters and 16 numerals)
• 1/100-second stopwatch
Measuring capacity: 23:59'59.99''
Measuring modes: Elapsed time, split time,1st-2nd place times
• Musical alarms
5 melodies (each presettable with a unique 2-part harmony) and beep
• Hourly time signal
• Auto-calender (to year 2039)
• 12/24-hour formats
• Regular timekeeping: Hour, min, sec, am/pm, month, date, day, daylight
saving on/off
CONTENTS
Page
1. SPECIFICATIONS: QW-2171..................................................................... 1
2. OPERATION CHART: QW-2171................................................................ 2
3. DRAWINGS: QW-2171
3-1. BLOCK DIAGRAMS ........................................................................... 5
3-2. CHECKING TERMINALS AND COMPONENT .................................. 7
4. EXPLODED VIEW: QW-2171..................................................................... 8
5. PARTS LIST: QW-2171.............................................................................. 9
6. PRECAUTIONS FOR REPAIR: QW-2171
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE........................... 10
6-2. ACCURACY CHECKING ................................................................... 10

— 2 —
GENERAL GUIDE
•Press CC
CC
Cto change from mode to mode.
•Pressing EE
EE
Ein any mode besides the Alarm Mode illuminates to the display for about three seconds. The backlight is disabled while a setting screen is on the display.
•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.
•If you do not perform any operation for a few minutes in any mode besides stopwatch mode, the watch automatically reverts to the normal timekeeping screen.
Timekeeping Mode Day Counter Mode Alarm Mode Stopwatch Mode Memo Mode
Press CC
CC
C.
TIMEKEEPING MODE
Press DD
DD
Dto toggle between 12-hour and 24-hour time-
keeping.
•With 12-hour timekeeping, times between midnight and
noon are indicated by A(am), while times between noon
and midnight are indicated by P(pm).
•The Aand Pindicators do not appear for 24-hour time-
keeping.
•Pressing BB
BB
Bplays a randomly selected melody. To stop
a playing melody, press any button besides EE
EE
E.
•Pressing EE
EE
Ewhile a melody is playing toggles the dis-
play between an animated character and the name of
the melody.
∗See the “MELODY LIST” for the names of melodies.
•Press EE
EE
Eto illuminate the display for about three sec-
onds. When 12-hour timekeeping is being used, press-
ing EE
EE
Ealso displays an animated character.
Timekeeping Mode Settings
In addition to settings for the current time and date, the Timekeeping Mode setting
screen also lets you turn button tones and melody play on and off, adjust tones and
melody volume, and adjust display contrast.
To make Timekeeping Mode settings
1.While in the Timekeeping Mode, hold down AA
AA
Auntil the seconds digits flash on the
display, indicating the setting screen.
2.Press CC
CC
Cto move the flashing in the sequence shown below. Press EE
EE
Eto move the
flashing in the opposite direction.
Seconds DST Hour Minutes Year
Contrast
(CNT)Volume (VOL)Sound (SOUND)MonthDay
Press . Press .
3.While the seconds setting is selected (flashing), press
DD
DD
Dor BB
BB
Bto reset it to 00.
•If you press DD
DD
Dor BB
BB
Bwhile 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.
•While the DST (Daylight Saving Time) setting is selected,
press DD
DD
Dor BB
BB
Bto toggle it on and off.
•DST indicator 1 is displayed in the Timekeeping Mode
setting screen only when the DST setting is selected. It
shows ON when the DST setting is on, and OFF when
the DST setting is off.
•DST indicator 2 is displayed in the Timekeeping Mode,
Day Counter Mode and Alarm Mode when the DST set-
ting is turned on.
•While the SOUND setting is selected, press DD
DD
Dor BB
BB
Bto turn the beep and musical
tone on and off, as shown below.
Beep Musical tone Off
Press . Press .
•While the VOL setting is selected, press DD
DD
Dor BB
BB
Bto toggle it between loud and soft.
Loud Soft
Press or .
•While the CNT setting is selected, press DD
DD
Dto make the display darker, or BB
BB
Bto
make it lighter.
•While any other setting is selected (flashing), press DD
DD
Dto increase it or BB
BB
Bto de-
crease it. Holding down either button changes the setting at high speed.
4.After you make the settings you want, press AA
AA
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.
Month
Day of week
Day
PM indicator
Hour Minutes
Seconds
DST indicator 2
DST indicator 1
DST indicator
2
ABOUT THE BACKLIGHT
About the Auto Light Switch Function
When the auto light switch function is turned on, the backlight automatically turns on
for two seconds under the conditions described below. Avoid wearing the watch on
the inside of your wrist. Doing so causes the auto light switch to operate when not
needed, which shortens battery life.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you approximately 40 degrees causes the backlight to illuminate.
Parallel to ground 40
°
•The backlight may not illuminate if the face of the watch is more than 15 degrees off
parallel to the left or right. Make sure that the back of your hand is parallel to the
ground.
•Static electricity or magnetic force can interfere with proper operation of the auto
light switch function. If the auto backlight does not illuminate, try moving the watch
back to the starting position (parallel with the ground) and then tilt it back toward
you again. If this does not work, drop your arm all the way down so it hangs at your
side, and then bring it back up again.
•Under certain conditions the backlight may not light until about one second or less
after turning the face of the watch towards you. This does not necessarily indicate
malfunction of the backlight.
To switch the auto light switch function on and off
In the Timekeeping Mode, hold down DD
DD
Dfor two seconds to turn the auto light switch
function on and off.
Auto light switch
indicator
ON OFF
•The auto light switch indicator is shown on the display in all modes while the auto
light switch function is on.
•In order to protect against running down the battery, the auto light switch function is
automatically turned off approximately three hours after you turn it on. Repeat the
above procedure to turn the auto light switch function back on if you want.
•Pressing EE
EE
Ein any mode besides the Alarm Mode illuminates the display for about
three seconds, regardless of the auto light switch’s on/off setting.
Caution
•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 is
because the EL light vibrates slightly when lit. It does not indicate malfunction of
the watch.
Warning!
•Never try to read your watch when mountain climbing or hiking in areas that
are dark or in areas with poor footing. Doing so is dangerous and can result
in serious personal injury.
•Never try to read your watch when running where there is the danger of acci-
dents, especially in locations where there might be vehicular or pedestrian
traffic. Doing so is dangerous and can result in serious personal injury.
•Never try to read your watch when riding on a bicycle or when operating a
motorcycle or any other motor vehicle. Doing so is dangerous and can result
in a traffic accident and serious personal injury.
•When you are wearing the watch, make sure that its auto light switch function
is turned off before riding on a bicycle or operating a motorcycle or any other
motor vehicle.
Sudden and unintended operation of the auto light switch can create a dis-
traction, which can result in a traffic accident and serious personal injury.
Hold down DD
DD
D.
Parallel to ground More than 15 degrees
too high More than 15 degrees too low
2. OPERATION CHART: QW-2171

— 3 —
DAY COUNTER MODE
Mode indicator
Day counter
record number
Text
Number of days DAYS indicator
Year
Month
Day
Target Date
The Day Counter Mode lets you count the number of days from the Timekeeping
Mode’s current date to a specific target date.
•There are five Day Counter records, each of which can be assigned up to 12 char-
acters of text and a target date.
•When a target date is reached, the DAYS indicator flashes on the display in the
Timekeeping Mode. The DAYS indicator also flashes in the Day Counter Mode
when the screen for the target date is on the display.
•The DAYS indicator flashes on the target date each year, regardless of the year
setting of the target date.
•The initial default date for a Day Counter record is 2001/1/1, and the text area
contains All spaces. (All spaces for the text display a series of hyphens “–––––”.)
Recalling Day Counter Data
In the Day Counter Mode, press DD
DD
Dto scroll through the Day Counter record screens.
•The day count is a negative value whenever the target date comes before the cur-
rent date.
•The display can show only five characters at a time. Longer text scrolls continu-
ously from right to left. The symbol “”indicates that the character or digit to the
left is the last, and the character or digit to the right is the first.
To set the target date
1.In the Day Counter Mode, press DD
DD
Dto display a record number you want to set.
2.Hold down AA
AA
Auntil the first (leftmost) text character starts to flash on the display.
This indicates the input screen.
3.Press CC
CC
Cto move the flashing in the sequence shown below. Press EE
EE
Eto move the
flashing in the opposite direction.
Press . Press .
Character 1
Day
Character 12
YearMonth
4.While the flashing is located within the text area, use DD
DD
Dor BB
BB
Bto scroll through
characters at the current location of the flashing. Holding down either button scrolls
through characters at high speed.
Press . Press .
Space A to Z Punctuation Japanese
characters
Hyphen SymbolsNumbers
∗See the “CHARACTER LIST”for details.
5.While any other setting is selected, press DD
DD
Dto increase it or BB
BB
Bto decrease it.
Holding down either button changes the setting at high speed.
•Pressing DD
DD
Dand BB
BB
Bat the same time while the flashing is located within the text area
clears any input text and resets the date setting to the current date. At this time the
message “CLEAR”appears on the display.
•Pressing DD
DD
Dand BB
BB
Bat the same time while the flashing is located within the date
area resets the date setting to the current date without affecting the text.
6.After you make the settings you want, press AA
AA
Ato exit the input screen.
•The date can be set within the range of January 1, 1940 to December 31, 2039.
ALARM MODE
Mode indicator
Alarm number
Melody name
Hour Minutes
Current time
You can set up to five melody alarms. When a Daily Alarm is turned on, its melody
alarm sounds for about 20 seconds at the preset time each day. Press any button
(except EE
EE
E) to stop the melody alarm after it starts to sound. Pressing EE
EE
Ewhile a
melody is playing toggles the display between an animated character and the name
of the melody that is playing. When the Hourly Time Signal is turned on, the watch
beeps every hour on the hour.
To set the alarm time
1.While in the alarm Mode, press DD
DD
Dto display the alarm number you want to set.
Alarm 1 Alarm 5Alarm 2 Alarm 3 Alarm 4
SIG: 00 (Hourly Time Signal)
2.Hold down AA
AA
Auntil the melody number starts to flash on the display, indicating the
setting screen. The alarm is automatically turned on at this time.
3.Press CC
CC
Cto change the selection in the sequence shown below.
Melody Name Hour Minutes
4.While melody setting is selected, use DD
DD
Dor BB
BB
Bto scroll through melody names.
Setting Alarm Sound
–0
–1
–2
–3
–4
–5
–
Ramdom play of melodies 1, 2, 3, 4 and 5
Melody 1
Melody 2
Melody 3
Melody 4
Melody 5
Beeper
Press .
Press .
∗See the “MELODY LIST”for the names of melodies.
∗Some melody alarms tune names may be displayed in abbreviated format.
•While any other setting is selected, press DD
DD
Dto increase it or BB
BB
Bto decrease it.
Holding down either button changes the setting at high speed.
5.After you make the settings you want, press AA
AA
Ato exit the setting screen.
•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.
To stop a melody alarm
•Press any button (except EE
EE
E) to stop a melody alarm after it starts to sound.
To turn a daily Alarm or the Hourly Time Signal on and off
1.Use DD
DD
Dto display the alarm you want to turn on or off, or the screen for turning the
Hourly Time Signal on or off.
2.Press BB
BB
Bto toggle the displayed alarm or Hourly Time
Signal on and off.
•Alarm indicator 1 is displayed in the alarm mode only. It
indicates the on/off status of the currently displayed
alarm only. Note that this indicator is used for different
purposes in other modes.
•Alarm indicator 2 is displayed in all modes when any of
the five alarms is turned on.
•Alarm indicator 3 is displayed in the Alarm Mode only.
It shows ON when the currently displayed alarm is on,
and OF when the currently displayed alarm is off.
•Hourly Time Signal indicator 1 is displayed in the Alarm
Mode only when the Hourly Time Signal is turned on.
Note that this indicator is used for different purposes in
other modes.
•Hourly Time Signal indicator 2 is displayed in all modes
when the Hourly Time Signal is turned on.
•Hourly Time Signal indicator 3 is displayed in the Alarm
Mode only. It shows ON when the Hourly Time Signal
is on, and OF when the Hourly Time Signal is off.
To test the alarm
In the Alarm Mode, display the alarm you want to sound,
and then press EE
EE
Eto play its melody or beep. You can
also press EE
EE
Eto play an alarm’s melody while setting the
alarm time.
•To stop a playing melody or beep, press any button.
Hourly Time Signal
indicator 1
Hourly Time Signal
indicator 2
Hourly Time Signal
indicator 3
Alarm indicator 1
Alarm indicator 2
Alarm indicator 3

— 4 —
MEMO MODE
The Memo Mode lets you store up to five memos, each
with an eight-character title and 16 characters of data.
Recalling a Memo
In the Memo Mode, press DD
DD
Dto scroll through the Memo
titles. When you find the title you want, press BB
BB
B, and the
screen alternates between the title and data.
•The display can show only five characters at a time.
Longer text scrolls continuously from right to left. The
symbol “”indicates that the character or digit to the
left is the last, and the character or digit to the right is
the first.
•A series of hyphens “–––––”is displayed for a memo
that does not contain any data. The display can show
only five characters at a time.
To input a memo
1.In the Memo Mode, press DD
DD
Dto display the memo number you want to set.
2.Hold down AA
AA
Auntil the first (leftmost) character of the memo title starts to flash on
the display. This indicates the input screen.
3.Press CC
CC
Cto move the flashing in the sequence shown below. Press EE
EE
Eto move the
flashing in the opposite direction.
Press . Press .
Title Character 8
Data Character 1
Title Character 1
Data Character 16
4.Use DD
DD
Dor BB
BB
Bto scroll through characters at the current location of the flashing.
Holding down either button scrolls at high speed.
Press . Press .
Space A to Z Punctuation Japanese
characters
Hyphen SymbolsNumbers
∗See the “CHARACTER LIST”for details.
•Pressing DD
DD
Dand BB
BB
Bat the same time while inputting memo title or data clears all title
and data. At this time the message “CLEAR”appears on the display.
5.After you input the data you want, press AA
AA
Ato exit the input screen.
STOPWATCH MODE
The stopwatch Mode lets you measure elapsed time, split
times, and two finishes. The range of the stopwatch is 23
hours, 59 minutes, 59.99 seconds. You can use the EL
backlight by pressing EE
EE
Eat any time while the stopwatch
is operating.
Elapsed time measurement
Start Stop Re-start Stop Clear
Start Split Split release Stop Clear
Start Split Stop Split release Clear
Split time measurement
Split time and 1st-2nd place times
First runner
finishes. Second runner finishes.
Record time of
first runner.
Record time of
second runner.
Mode indicator
Hours
Minutes
Seconds
1/100 second
Current time
Mode indicator
Memo number
Title
CHARACTER LIST
MELODY LIST
1 Heartbreak hotel
2 (I can’t get no) Satisfaction
3 Walk this way
4 New year’s day
5 Smells like teen spirit
T-0030004

— 5 —
3. DRAWINGS: QW-2171
3-1. BLOCK DIAGRAMS
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L C 1
c9
e8
g8
c8
X6Y12
X7Y12
X8Y12
X9Y12
X10Y12
X11Y12
X12Y12
X13Y12
X14Y12
X15Y12
X16Y12
X17Y12
X18Y12
X19Y12
X20Y12
X21Y12
X22Y12
L C 2
d8
X6Y11
X7Y11
X8Y11
X9Y11
X10Y11
X11Y11
X12Y11
X13Y11
X14Y11
X15Y11
X16Y11
X17Y11
X18Y11
X19Y11
X20Y11
X21Y11
X22Y11
L C 3
K2
X0Y8
X1Y8
X2Y8
X3Y8
X4Y8
X5Y8
X6Y8
X7Y8
X8Y8
X9Y8
X10Y8
X11Y8
X12Y8
X13Y8
X14Y8
X15Y8
X16Y8
X17Y8
X18Y8
X19Y8
X20Y8
X21Y8
X22Y8
L C 4
K3
X0Y9
X1Y9
X2Y9
X3Y9
X4Y9
X5Y9
X6Y9
X7Y9
X8Y9
X9Y9
X10Y9
X11Y9
X12Y9
X13Y9
X14Y9
X15Y9
X16Y9
X17Y9
X18Y9
X19Y9
X20Y9
X21Y9
X22Y9
L C 5
K4
X0Y10
X1Y10
X2Y10
X3Y10
X4Y10
X5Y10
X6Y10
X7Y10
X8Y10
X9Y10
X10Y10
X11Y10
X12Y10
X13Y10
X14Y10
X15Y10
X16Y10
X17Y10
X18Y10
X19Y10
X20Y10
X21Y10
X22Y10
L C 6
b9
f8
a8
b8
X6Y5
X7Y5
X8Y5
X9Y5
X10Y5
X11Y5
X12Y5
X13Y5
X14Y5
X15Y5
X16Y5
X17Y5
X18Y5
X19Y5
X20Y5
X21Y5
X22Y5
L C 7
K0
X0Y6
X1Y6
X2Y6
X3Y6
X4Y6
X5Y6
X6Y6
X7Y6
X8Y6
X9Y6
X10Y6
X11Y6
X12Y6
X13Y6
X14Y6
X15Y6
X16Y6
X17Y6
X18Y6
X19Y6
X20Y6
X21Y6
X22Y6
L C 8
K1
X0Y7
X1Y7
X2Y7
X3Y7
X4Y7
X5Y7
X6Y7
X7Y7
X8Y7
X9Y7
X10Y7
X11Y7
X12Y7
X13Y7
X14Y7
X15Y7
X16Y7
X17Y7
X18Y7
X19Y7
X20Y7
X21Y7
X22Y7
L27
L28
L29
L30
L31
L32
L33
L34
L35
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L46
L47
L48
L49
L50
L C 1
e7
g7
c7
e6
g6
c6
X22Y3
X21Y3
X20Y3
X19Y3
X18Y3
X17Y3
X16Y3
X15Y3
X14Y3
X13Y3
X12Y3
X11Y3
X10Y3
X9Y3
X8Y3
X7Y3
X6Y3
L C 2
d7
d6
X22Y2
X21Y2
X20Y2
X19Y2
X18Y2
X17Y2
X16Y2
X15Y2
X14Y2
X13Y2
X12Y2
X11Y2
X10Y2
X9Y2
X8Y2
X7Y2
X6Y2
L C 3
X23Y8
X24Y8
X25Y8
X26Y8
X27Y8
X28Y8
K7
b0
a0
f0
b1
a1
b2
a2
AUTO EL
DST
a3
SIG
ALM
b4
a4
a5
f5
PM
LC 4
X23Y9
X24Y9
X25Y9
X26Y9
X27Y9
X28Y9
K8
c0
g0
c1
g1
f1
c2
g2
f2
b3
g3
f3
COL
g4
f4
b5
g5
AM
L C 5
X23Y10
X24Y10
X25Y10
X26Y10
X27Y10
X28Y10
K9
d0
e0
DAYS
d1
e1
d2
e2
c3
d3
e3
c4
d4
e4
c5
d5
e5
L C 6
f7
a7
b7
f6
a6
b6
X22Y4
X21Y4
X20Y4
X19Y4
X18Y4
X17Y4
X16Y4
X15Y4
X14Y4
X13Y4
X12Y4
X11Y4
X10Y4
X9Y4
X8Y4
X7Y4
X6Y4
L C 7
X23Y6
X24Y6
X25Y6
X26Y6
X27Y6
X28Y6
K5
X22Y1
X21Y1
X20Y1
X19Y1
X18Y1
X17Y1
X16Y1
X15Y1
X14Y1
X13Y1
X12Y1
X11Y1
X10Y1
X9Y1
X8Y1
X7Y1
X6Y1
L C 8
X23Y7
X24Y7
X25Y7
X26Y7
X27Y7
X28Y7
K6
X22Y0
X21Y0
X20Y0
X19Y0
X18Y0
X17Y0
X16Y0
X15Y0
X14Y0
X13Y0
X12Y0
X11Y0
X10Y0
X9Y0
X8Y0
X7Y0
X6Y0
COM.
SEG. COM.
SEG.
AUTO EL
K1
K2
K3
K4
K6
d8
K9
K0
K8
K7
K5
b8
ALM
c8
g6
SIG DST
a0
g8
e8 f8
e6
a8 a6
f6
f0
a1
g1
d1
b1
c1
e1 f1
g0
e0
d0
c0 b0
a4
b4
g4
d4
c4
e4 f4
e2 f2
a2
b2
g2
c2
d2
e3 f3
a3
b3
g3
c3
d3d5
b5
a5
c6
g5
b9
PM
AM
COL
c5
e5 f5
b6
d6
a7
f7
g7
e7
c7 b7
d7
c9
DAYS
LC1
LC7 LC6
LC2
L40 L41 L42 L43 L44 L45 L46 L47 L48 L49 L50 L39 L38 L37 L36 L35 L34 L33 L32 L31 L30 L29
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 L 4 L 3 L27 L28
LC8 LC5 LC4 LC3
X0
Y0
Y12
X28

— 6 —
TOTAL 107 PINS
BONDING 98 PINS
Display 60
Others 47
LSI
+
XTB
XT
AC
T1
T2
T3
VREF1
LCD LL2
Di2
PZ
L1 , L2 * 1
L51 ~ L52 * 1
SDI*1
CSB*1 LD2*1 EMP*1
GNDA
VREF
VDD2A
LD1*1 VDD2 GND VCH VDSP VDD1 VC1 VC2 VHF VC3 VC4VDD3
C7
C8
C4 C3 C2
+
C6 C5
C1
LL1 C10
EL
FRONT
BACK
BAT
CT
C9
C11
Xtal BD1 BD2 MIN
ENV SDOSCK SCUT
VCC
Vcc C12
Vss A2 A1 A0
WP
WP
SCL
SCL
SDA
SDA
EEPROM
L3 L50 LC1 LC8 KI1
KI2
KI3
KI4
KI5
KI8
KC5
S1
S2
S3
S4
F0
SK *2
KI9
KC4
KC3
KC2
KI7
KI6
KC1
R2
Tr1
E'
CLF2
CLF1
V+
GND
L-
VOUT
L+
INV
✽1. No bonding

— 7 —
Top view of P.C.B. ass'y Bottom view of P.C.B. ass'y
3-2. CHECKING TERMINALS AND COMPONENT
VDD2
VREF
KI8
VHF
GND
SD0
GND
WP
GND
CLF2
VDD1
VC1
GND
GND
XT
GND
KC1
VREF
GND
GND
GND
GND
BD1
BD2
BD2 VDD2
VCH
VCC
KI5
GND
KI6
VDD3
VDD3
VC2
GND
XT
GND
BD2
GND
VCH
AC
GND
GND
VDD2
VDSP
KI4
VDD2
VCC
SCUT
SCK
VDSP
GND
VDD2
BD1
KI9
KC4
KC3
KC2
KI7 KC2
VDD2
VDD2
GND
GND
VC1
KI1
KI2
KI3
KC5
KI8
SD0
SCK
GND
L+ CLF2
CLF1
L+
L-
VOUT
VDD2
VCC
CLF1
VCC
L
VCC WP
VOUT
KC5
GND
XTB
VC3VC4
L-
GND
WP
BD1
L
GND
A4
KI6
KI6
PCB WITH LSI
C2 Capacitor/Chip
C3 Capacitor/Chip
C9 Capacitor/Chip C4 Capacitor/Chip
C1 Capacitor/Chip
C7 Capacitor/Chip
C8 Capacitor/Chip
Capacitor/Tantalum
C6
Capacitor/Tantalum
C5
Capacitor/Chip
C12
Capacitor/Chip
C10
Capacitor/Chip
C11
Resistor/Chip
R2 Transistor
Tr1
Diode
Di2
CoilLL2 CoilLL1
7. Cushion/506
(7211 9631)
5. Sensor/Tilt
(7105 5275)
7. Cushion/506
(7211 9631)
Inverter
INV
Memory/External
(1001 0950)
CT 3. Capacitor/Trimmer
Xtal
SK
8. Cushion/6
(7211 0064)
4. Oscillator/Crystal
(7110 6302)

— 8 —
4. EXPLODED VIEW: QW-2171
1a (1001 6312)
1b (1001 6313)
2 (1001 6311)
Battery/Lithium
(CR2016)
PCB (Unrepairable)
10 (1001 6309)10 (1001 6309)
6 (7236 2086)
9 (7231 1952)
11 (7233 0952)
14 (7230 0441)
12 (1001 6310)
13 (7230 0616)

5. PARTS LIST: QW-2171
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 3253 MODULE/WITHOUT MOVEMENT QW-2171YC-02TK GM-100-1A 1 A
7640 3254 MODULE/WITHOUT MOVEMENT QW-2171YC-03TK GM-100-2/8 1 A
1a 1001 6312 LCD C2171-02P QW-2171YC-02TK 1 A
1b 1001 6313 LCD C2171-03P QW-2171YC-03TK 1 A
2 1001 6311 EL YEL-2171-A-01 QW-2171YC-02TK/03TK 1 A
3 1001 0950 CAPACITOR/TRIMMER CTZ2E-30C-W2-P QW-2171YC-02TK/03TK 1 B
4 7110 6302 OSCILLATOR/CRYSTAL DT-26S10 QW-2171YC-02TK/03TK 1 B
5 7105 5275 SENSOR/TILT TS-2418-P QW-2171YC-02TK/03TK 1 B
6 7236 0286 CONTACT/BATTERY (–) 1650 Q357954C-1 QW-2171YC-02TK/03TK 1 C
7 7211 9631 CUSHION/506 Q49364-1 QW-2171YC-02TK/03TK 2 C
8 7211 0064 CUSHION/6 Q4914-1 QW-2171YC-02TK/03TK 1 C
9 7231 1952 HOLDER/BATTERY 2058 Q253743-1 QW-2171YC-02TK/03TK 1 C
10 1001 6309 INTERCONNECTOR/2171 Q466259-1 QW-2171YC-02TK/03TK 2 C
11 7233 0952 SHEET/INSULATION 1028 Q434476-1 QW-2171YC-02TK/03TK 1 C
12 1001 6310 SPACER/PRINTED 2171-1 Q466298-1 QW-2171YC-02TK/03TK 1 C
13 7230 0616 SPRING/COIL 1199-1 Q437728B-1 QW-2171YC-02TK/03TK 2 B
14 7230 0441 SPRING/COIL 1199-3 Q437730-1 QW-2171YC-02TK/03TK 2 B
BATTERY/LITHIUM CR2016 QW-2171YC-02TK/03TK 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.-560.
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-2171
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-2171
Metallic tweezers
AB
CD
E

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