Casio QW-2171 Service Manual & Parts List

SERVICE MANUAL

& PARTS LIST

REF. NO. S/M-700

JUL. 2000

MODULE NO.

QW-2171

GM-100

R

(WITHOUT PRICE)

CONTENTS

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

1. SPECIFICATIONS: QW-2171

Item Detail

Page

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

•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

— 1 —

2

2. OPERATION CHART: QW-2171

CC

• Press

C to change from mode to mode.

CC

EE

• Pressing

E in 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.

EE

• 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

CC

Press

C.

CC

GENERAL GUIDE

TIMEKEEPING MODE

Seconds

Minutes

DST indicator 2

DST indicator

Press . Press .

Beep

Loud

Day

DD

Press

D to toggle between 12-hour and 24-hour time-

DD

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 A and P indicators do not appear for 24-hour time-
keeping.

BB

• Pressing

B plays a randomly selected melody. To stop

BB

a playing melody, press any button besides

EE

• Pressing

E while a melody is playing toggles the dis-

EE

play between an animated character and the name of
the melody.

∗

See the “MELODY LIST” for the names of melodies.

EE

• Press

E to illuminate the display for about three sec-

EE

onds. When 12-hour timekeeping is being used, press-

EE

ing

E also displays an animated character.

EE

AA

A until the seconds digits flash on the

AA

Volume
(VOL)

3.While the seconds setting is selected (flashing), press

• If you press
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

• 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 set­ting is turned on.

Sound
(SOUND)

DD

BB

D or

B to reset it to 00.

DD

BB

DD

BB

D or

B while the seconds setting is in the

DD

BB

DD

BB

D or

B to toggle it on and off.

DD

BB

DD

BB

D or

B to turn the beep and musical

DD

BB

Musical tone Off

DD

BB

D or

B to toggle it between loud and soft.

DD

BB

Press or .

DD

D to make the display darker, or

DD

AA

A to exit the setting screen.

AA

Soft

DD

D to increase it or

DD

EE

E.

EE

EE

E to move the

EE

MonthDay

BB

B to

BB

BB

B to de-

BB

Month

Day of week

Hour

PM indicator

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
display, indicating the setting screen.

CC

2.Press

C to move the flashing in the sequence shown below. Press

CC

flashing in the opposite direction.

Press . Press .

Seconds DST Hour Minutes Year

Contrast
(CNT)

DST indicator 1

• While the SOUND setting is selected, press

tone on and off, as shown below.

• While the VOL setting is selected, press

• While the CNT setting is selected, press

make it lighter.

• While any other setting is selected (flashing), press

crease it. Holding down either button changes the setting at high speed.

4.After you make the settings you want, press

• 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.

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

• 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.

Parallel to 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
function on and 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.

EE

• Pressing

E in any mode besides the Alarm Mode illuminates the display for about

EE

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 acci­dents, 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 dis­traction, which can result in a traffic accident and serious personal injury.

More than 15 degrees
too high

DD

D for two seconds to turn the auto light switch

DD

Auto light switch
indicator

DD

Hold down

D.

DD

ON OFF

40

°

More than 15 degrees
too low

— 2 —

DAY COUNTER MODE

Hourly Time Signal
indicator 1

Hourly Time Signal
indicator 2

Hourly Time Signal
indicator 3

Alarm indicator 1

Alarm indicator 2

Alarm indicator 3

Mode indicator

Text

ALARM MODE

Mode indicator

Melody name

Year
Month

Target Date

Day counter
record number

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 char­acters 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

• The day count is a negative value whenever the target date comes before the cur­rent date.

• The display can show only five characters at a time. Longer text scrolls continu­ously from right to left. The symbol “
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

2.Hold down

This indicates the input screen.

3.Press

flashing in the opposite direction.

4. While the flashing is located within the text area, use

characters at the current location of the flashing. Holding down either button scrolls
through characters at high speed.

∗

See the “CHARACTER LIST” for details.

5. While any other setting is selected, press

Holding down either button changes the setting at high speed.

• Pressing
clears any input text and resets the date setting to the current date. At this time the
message “CLEAR” appears on the display.

• Pressing
area resets the date setting to the current date without affecting the text.

6.After you make the settings you want, press

• The date can be set within the range of January 1, 1940 to December 31, 2039.

Number of days

DD

D to scroll through the Day Counter record screens.

DD

” indicates that the character or digit to the

DD

D to display a record number you want to set.

AA

A until the first (leftmost) text character starts to flash on the display.

AA

CC

C to move the flashing in the sequence shown below. Press

CC

Press . Press .

Character 1

Press . Press .

Space A to Z Punctuation

Hyphen SymbolsNumbers

DD

BB

D and

B at the same time while the flashing is located within the text area

DD

BB

DD

BB

D and

B at the same time while the flashing is located within the date

DD

BB

DD

Day

Day

DAYS indicator

Character 12

YearMonth

DD

BB

D or

B to scroll through

DD

BB

DD

D to increase it or

DD

AA

A to exit the input screen.

AA

EE

E to move the

EE

Japanese
characters

BB

B to decrease it.

BB

Current time

Alarm number

Hour

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

EE

(except

E) to stop the melody alarm after it starts to sound. Pressing

EE

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

D to display the alarm number you want to set.

DD

Minutes

EE

E while a

EE

Alarm 1 Alarm 5Alarm 2 Alarm 3 Alarm 4

SIG: 00 (Hourly Time Signal)

2.Hold down

3.Press

4.While melody setting is selected, use

∗
∗

• While any other setting is selected, press

5.After you make the settings you want, press

• The format (12-hour and 24-hour) of the alarm time matches the format you select

• When setting the alarm time using the 12-hour format, take care to set the time

To stop a melody alarm

• Press any button (except

To turn a daily Alarm or the Hourly Time Signal on and off

1.Use

AA

A until the melody number starts to flash on the display, indicating the

AA

setting screen. The alarm is automatically turned on at this time.

CC

C to change the selection in the sequence shown below.

CC

Melody Name Hour Minutes

DD

BB

D or

B to scroll through melody names.

DD

BB

Setting Alarm Sound

– 0

Press .

Press .

See the “MELODY LIST” for the names of melodies.
Some melody alarms tune names may be displayed in abbreviated format.

Holding down either button changes the setting at high speed.

for normal timekeeping.
correctly as morning or afternoon.

DD

D to display the alarm you want to turn on or off, or the screen for turning the

DD

Hourly Time Signal on or off.

– 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

DD

D to increase it or

DD

AA

A to exit the setting screen.

AA

EE

E) to stop a melody alarm after it starts to sound.

EE

BB

2.Press

B to toggle the displayed alarm or Hourly Time

BB

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.

BB

B to decrease it.

BB

— 3 —

• 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
also press
alarm time.

• To stop a playing melody or beep, press any button.

EE

E to play its melody or beep. You can

EE

EE

E to play an alarm’s melody while setting the

EE