Casio QW-2461 Service Manual & Parts List
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-757
NOV. 2001
MODULE NO.
QW-2461
BGM-220LV
R
(WITHOUT PRICE)
CONTENTS
Page
1. SPECIFICATIONS: QW-2461..................................................................... 1
2. OPERATION CHART: QW-2461................................................................ 2
3. DRAWINGS: QW-2461
3-1. LCD DIAGRAM ............................................................................................. 5
3-2. CIRCUIT DIAGRAM ......................................................................................6
3-3. CHECKING TERMINALS AND COMPONENT............................................. 7
4. EXPLODED VIEW: QW-2461..................................................................... 8
5. PARTS LIST: QW-2461.............................................................................. 9
6. PRECAUTIONS FOR REPAIR: QW-2461
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE ..................................... 10
6-2. ACCURACY CHECKING ............................................................................. 10
1. SPECIFICATIONS: QW-2461
Item Detail
Battery CR1620
Battery life Approx. 1.5 years
Current consumption 3.94 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
• Electro-luminescent backlight
Afterglow
• Day Counter
Automatically counts down the days from the current date to a target
date.
Memory capacity: 5 records (12 character of text)
A mark appears on the display to let you know when a target date is
reached.
• Free memos
5 independent free memos (up to 8 characters and 16 numerals)
• Katakana display
• 1/100-second stopwatch
Measuring capacity: 23:59'59.99''
Measuring modes: Elapsed time, split time,1st-2nd place times
• Musical alarms
5 independent daily alarms
Melody (presettable with a unique 2-part harmony) and beep
*Two special melodies are prepared for the dates December 25 and
January 1 (Japan Standard Time).
• Hourly time signal
• Auto-calender (to year 2039)
• 12/24-hour formats
• Regular timekeeping: Hr, min, sec, am/pm, month, date, day, daylight
saving on/off
— 1 —
2. OPERATION CHART: QW-2461
General Guide
• Press C to change from mode to mode.
• 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.
Timekeeping Mode Day Counter Mode
Press C.
Timekeeping Mode
Press D to toggle between 12-hour and 24-hour
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 A until the second’s digits flash
on the display, indicating the setting screen.
2. Press C to move the flashing in the sequence shown below. Press E to
move the flashing in the opposite direction.
Press . Press .
Seconds DST Hour Minutes Year
Contrast
(CNT)
DST indicator 1
• While the SOUND (button tones) setting is selected, press D or B to turn
the beep and musical tone on and off, as shown below.
• Changing the SOUND also changes the Hourly Time Signal tones.
•
While the VOL setting is selected, press D or B to toggle it between loud
and soft.
Day
Seconds
Minutes
DST indicator 2
DST indicator 2
Press . Press .
Beep
timekeeping.
• 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
timekeeping.
• Pressing B plays a melody. To stop a playing
melody, press any button besides E.
• Special melodies play each year on January 1 and
December 25.
• Pressing E while a melody is playing toggles the
display between an animated character and the
name of the melody.
• Press E to illuminate the display for about three
seconds.
Volume
(VOL)
3.While the second’s setting is selected (flashing),
• If you press D or B while 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 D or B to 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 setting is turned on.
Daylight Saving Time (DST), which is also
sometimes called “summer time” advances 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.
Sound
(SOUND)
press D or B to reset it to 00.
Musical tone Off
Press or .
MonthDay
• 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.
Alarm Mode Stopwatch Mode Memo Mode
4. After you make the settings you want, press A to 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 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.
About the Backlight
Pressing E in any mode besides the Alarm Mode illuminates the display for
about three seconds. The backlight is disabled while a setting screen is on the
display.
• The backlight of this watch employs an electro-luminescent (EL) light, which
loses its illumination power after very long term use.
• Frequent use of the backlight shortens battery life.
• The illumination provided by the backlight may be hard to see when viewed
under direct sunlight.
• The backlight automatically turns off an alarm sounds.
• The watch emits an audible sound whenever the display is illuminated. This
does not indicate malfunction.
About the animated character
An animated character appears on the display of the watch any time you turn
on the EL backlight after December 25 (2000 for Module 2255; 2001 for
Module 2461). No animated character appears before then.
Day Counter Mode
Mode indicator
Text
Year
Month
Target Date
Day counter
record number
Number of days
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 D to scroll through the Day Counter record
screens.
• The day count is a negative value whenever the target date comes before the
current date.
Day
DAYS indicator
• With some models, changing the volume setting affects volume very little.
• While the CNT setting is selected, press D to make the display darker, or B
to make it lighter.
• While any other setting is selected (flashing), press D to increase it or B to
decrease it. Holding down either button changes the setting at high speed.
Loud
Soft
— 2 —
Loading...