Casio QW-2387 Service Manual & Parts List
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-748
AUG. 2001
MODULE NO.
QW-2387
G-200
R
(WITHOUT PRICE)
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. SPECIFICATIONS: QW-2387
Item Detail
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 generate a strong magnetic field.
Exposure to strong magnetism can cause timekeeping to slow, affecting
timekeeping accuracy.
— 1 —
2. OPERATION CHART: QW-2387
•Press C to change from mode to mode.
•In any mode (except when making any settings), press L to illuminate the display.
Calendar Mode
Press C.
Timekeeping Mode
CALENDAR MODE
GENERAL GUIDE
To set the date
Month
Day
1.In the Calendar Mode, hold down B for about two seconds, until “ADJ” and then
the year digits flash on the display. Keep B depressed until the year digits flash.
2.While any setting is selected (flashing), press C to increase it. Holding down C
changes the flashing setting at high speed.
3.Press B to 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.
Hold down B. Press B.
Press B.
Day of week
Year
Day
Month
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
Hold down B.
Hour
PM indicator
1. In the Timekeeping Mode, hold down B for about two seconds, until “ADJ” and
then the second’s digits flash on the display. Keep B depressed until the second’s
digits flash.
2.While the second’s digits are selected (flashing), press C to reset the seconds to
00. If you press C while the second’s count is in the range of 30 to 59, the seconds 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 B to move the selection around the display in the above sequence.
4. While hour or minutes are selected (flashing), press C to increase the setting.
Holding down C changes the current setting at high speed. While the 12/24-hour
setting is selected, press C to 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 A advances the hands 20 seconds. Holding down A advances 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.
Seconds
Minutes
Seconds
Press B.
12/24
Press B.
Press B.
Hour
Press B.
Minutes
ABOUT THE BACKLIGHT
In any mode (except when making any settings), press L to 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.
Alarm Mode
Stopwatch Mode Dual Time Mode
ALARM MODE
Hold down B.
Hour
Mode indicator
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 B for about two seconds, until “ADJ” and then the
hour digits flash on the display. Keep B depressed until the hour digits flash.
2.Press C to increase the setting. Holding down C changes the current setting at
high speed.
3.Press B to 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 B to turn the daily alarm on and off.
To test the alarm
Hold down C while in any mode to sound the alarm.
Minutes
ON
Press B.
Press
Hour
Press B.
Minutes
OFF
B.
STOPWATCH MODE
The Stopwatch Mode lets you measure elapsed time. The
range of the stopwatch is 23 hours, 59 minutes 59 seconds. 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 B to start the stopwatch.
2.Press B again to stop the stopwatch.
• You can repeat steps 1 and 2 as many times as you
want.
Minutes
Seconds
Mode indicator
3.To reset the stopwatch time to all zeros, hold down B.
1/100 seconds
After the first hour
Hour
Minutes
Seconds
— 2 —
The Dual Time Mode lets you keep track of the time in another time zone.
DUAL TIME MODE
To set the Dual Time
Hold down B.
Seconds
Hour
1.In the Dual Time Mode, hold down B for about two seconds, until “ADJ” and then
the hour digits flash on the display. Keep B depressed until the hour digits flash.
2.Press C to increase the setting. Holding down C changes the current setting at
high speed.
3.Press B to 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.
Minutes
Mode indicator
Press B.
Hour
Press B.
Minutes
— 3 —
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