Casio BG-153, QW-2285, BG-154, QW-2286 Service Manual & Parts List

(WITHOUT PRICE)

SERVICE MANUAL

& PARTS LIST

REF. NO. S/M-729

JANUARY 2001

QW-2285
QW-2286

MODULE NO.

R

BG-153

(QW-2285)

BG-154

(QW-2286)

- 1 -

CONTENTS

1. SPECIFICATIONS : QW-2285 / 2286

1. SPECIFICATIONS • • • • • • • • • • • • • • • • • • • • • • • • • • 1

2. OPERATION CHART • • • • • • • • • • • • • • • • • • • • • • • • 2

3. DRAWINGS • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 6
3-1. BLOCK DIAGRAM • • • • • • • • • • • • • • • • • • • • • • • • 6
3-2. CHECKING TERMINALS AND COMPONENTS• • • • 7

4. EXPLODED VIEW • • • • • • • • • • • • • • • • • • • • • • • • • • 8

5. PARTS LIST • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 9

6. PRECAUTIONS FOR REPAIR • • • • • • • • • • • • • • • • • • 10
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE • • 10
6-2. ACCURACY CHECKING • • • • • • • • • • • • • • • • • • • 10

Item Detail Item Detail

Battery CR1616 Accuracy ±15sec./month
Battery life Approx. 24 months Accuracy setting system Trimmer capacitor
Current consumption 1.12 µA maximum Accuracy checking See page 10
Alarm system Piezo plate on Back cover Accuracy setting +0.25~+0.35sec./day

Function

QW-2285

• Shock resistant

• Electro-luminescent backlight
Afterglow

• Memory function
Memory capacity: Up to 25 sets of data, each set 
including; Name (8 characters) and telephone
number (12 digits)
Other: Auto-sort

• 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.

• 1/100-second stopwatch
Measuring capacity: 23:59'59.99"
Measuring modes: Elapsed time, split time,
1st-2nd place times

• Dual time

• 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

QW-2286

• Shock resistant

• Electro-luminescent backlight
Afterglow

• Memory function
Memory capacity: Up to 25 sets of data, each set 
including; Name (8 characters) and telephone
number (12 digits)
Other: Auto-sort

• Day Counter
Automatically counts down the days from the current
date to a target date.
Memory capacity: 5 records (8 character of text)
A mark appears on the display to let you know when
a target date is reached.

• 1/100-second stopwatch
Measuring capacity: 23:59'59.99"
Measuring modes: Elapsed time, split time,
1st-2nd place times

• Dual time

• Daily alarms
5 independent daily alarms

• 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 : MODULE QW-2285

GENERAL GUIDE

Press to change from mode to mode.
Pressing in any mode (except when making any settings) illuminates the display for about 3 seconds.
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 the Data Bank Mode or Day Counter Mode, the watch automatically reverts to the normal timekeeping screen.

Timekeeping Mode Data Bank Mode

Press .

Day Counter Mode Alarm Mode Stopwatch Mode Dual Time Mode

TIMEKEEPING MODE

Press to toggle between 12-hour and 24-hour timekeeping.

Seconds

Day of week

PM indicator

MinutesHour

Year - Month - Day

DST on indicator

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 when you are using 24-hour timekeeping.

To set the time and date

1.While in the Timekeeping Mode, hold down until the
seconds digits flash on the display, indicating the
setting screen.

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

DST

Seconds

Day

Hour

Year

Month

Minutes

3.While the seconds setting is selected (flashing), press to reset it to 00. If you
press 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 setting is selected (DST on indicator is flashing), press to
toggle it on (on) and off (OF). If DST setting is on, the DST on indicator is shown
in the Timekeeping Mode, Day Counter Mode and Alarm Mode.

4.While any other setting is selected (flashing), press to increase it or to
decrease it. Holding down either button changes the setting at high speed.

5.After you make the settings you want, press 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.
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.

ABOUT THE BACKLIGHT

Press to illuminate the display for about 3 seconds.

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.

DATA BANK MODE

The Data Bank Mode lets you store up to 25 records, each with a name (up to eight
characters) and a phone number (up to 12 digits). Data is automatically stored into
alphabetical order based on the name data. You can recall records by scrolling
through them on the display.

Mode indicator

Te xt area

Number area

Remaining memory

The record on the display when you exit the Data Bank Mode appears first the next
time you enter the Data Bank Mode.

To input a new Data Bank record

1.In the Data Bank Mode, press until the new data
screen appears.

If the new data screen does not appear when you
press and , it means that memory is full. To
store another record, you will first have to delete a
record stored in memory.

2.Hold down and a cursor appears on the text area.

3.Use or to scroll through characters at the current cursor position. Characters
scroll in the sequence shown below.

A to Z

0 to 9

(Space)

Press .

Press .

Holding down either button scrolls at high speed.

4.When the character you want is at the current cursor position, press to move the
cursor to the right.

5.Repeat the steps 3 and 4 to input the rest of the characters.

You can input up to eight characters for the name, though only three characters
are visible at a time. If the name you input has fewer than eight characters, use

to move the cursor to the eighth space (which means you would press
three times after inputting a five-character name).
Holding down to move the cursor at high speed.

6.After you input the name, use to move the cursor to the number area.
Pressing while the cursor is located at the eighth character of the text area
advances to the number area. Pressing while the cursor is located at the 12th
digit of the number area returns to the text area.

7.Use or to scroll through characters (hyphen, numbers, space) at the current

cursor position on the number area. Characters scroll in the sequence shown
below.

0 to 9 (Space)

Press .

Press .

Holding down either button scrolls characters at high speed.
You can input up to 12 digits for the number.

8.After inputting the name and number of the record, press to store it and exit the

setting screen.

The display can show only three name characters at a time. Longer names scrolls
continuously from right to left. The symbol “

” indicates that the character to the

left is the last, and the character to the right is the first.

To recall Data Bank data

In the Data Bank Mode, press to scroll through the stored data items.

Holding down scrolls at high speed.

To edit Data Bank data items

1.In the Data Bank Mode, press to display the data you want to edit.

2.Hold down until the cursor appears in the display.

3.Use to move the cursor to the character you want to change.
Holding down to move the cursor at high speed.

4.Use or to change the character.
Holding down either button scrolls characters at high speed.
See step 3 of “To input a new Data Bank record” for information on inputting
name characters, and step 7 for inputting number characters.

5.After making the changes that you want, press to store them and exit the setting

screen.

To delete a Data Bank record

1.In the Data Bank Mode, press to display the record you want to delete.

2.Hold down until the cursor appears in the display.

3.Press and at the same time. The message “CLR” appears in the display,

indicating that the record was deleted.

After the record is deleted, the cursor appears in the text area, ready for input.

4.Input a new record or press to exit the setting screen.

[ New Data Screen ]

C

C

C

C C

C

C

C

C

C

C

C

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

B

B

B

B

B

B

B

B

A

A

A

A

A

A

A

A

- 3 -

DAY COUNTER MODE

The Day Counter Mode lets you count the number of days from the Timekeeping
Mode’s current date to a specific target date.
This watch has five Day Counter records, each of which can be assigned up to 8
characters of text and a target date. Whenever the date specified by a day counter
matches the date of the Timekeeping Mode (regardless of the day counter’s year
setting), the DAYS indicator flashes on the Timekeeping Mode and Dual Time Mode
screen. In the Day Counter Mode, the DAYS indicator flashes on the screen of the
particular day counter whose date matches the date of the Timekeeping Mode.

The initial default date for all Day Counters is January 1, 2001.

Number of days

Year - Month - Day

Target date

Mode indicator

Text

DAYS indicator

Positive count value
indicates a future date, 
while a negative value 
indicates a past date.

The day counter on the display when you exit the Day Counter Mode appears first
the next time you enter the Day Counter Mode.

Recalling Day Counter Data

In the Day Counter Mode, press to scroll through the day counters.

To set the target date

1.In the Day Counter Mode, press to display the day counter you want to set.

2.Hold down until the flashing cursor appears in the text area. This indicates the
input screen.

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

Holding down to move the cursor at high speed.

1st digit
Day

8th digit

YearMonth

Press .

4.While the cursor is in the text area, use or to scroll through characters at the
current cursor position. Characters scroll in the sequence shown below. Holding
down either button scrolls at high speed.

A to Z

0 to 9

(Space)

Press .

Press .

5.While the cursor is in the date area, press to increase the number or to
decrease it. Holding down either button changes at high speed.

To clear a Day Counter record, press and at the same time while the
cursor is in either the text area or number area. The message “CLR” appears on
the display, the characters in the text area are deleted, and today’s date is set as
the target date. After the clear operation is complete, you can create a new record
by changing the date setting.

6.After you make the settings you want, press to exit the input screen.

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

ALARM MODE

When a Daily Alarm is turned on, the alarm sounds for 20
seconds each day when the current Timekeeping Mode
time matches the alarm time setting. Note that the alarm
setting has no relation to the Dual Time Mode time.
Press any button to stop the alarm after it starts to sound.
When the Hourly Time Signal is turned on, the watch
beeps every hour on the hour.

The alarm on the display when you exit the Alarm Mode
appears first the next time you enter the Alarm Mode.

To set the alarm time

1.Hold down until the hour digits start to flash on the
display, indicating the setting screen.

At this time, the alarm is turned on automatically.

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

Minutes

Hour

3.Press to increase the selected digits and to decrease them. Holding down
either button changes the setting at high speed.

4.After you set the alarm time, press to exit the setting screen.

The format (12-hour and 24-hour) of the alarm time matches the format you select
in the Timekeeping Mode.
When setting the alarm time using the 12-hour format, take care to set the time
correctly as morning or afternoon.

To stop the alarm

Press any button to stop the alarm after it starts to sound.

To switch the daily Alarm and the 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.

Both ON Both OFF Daily Alarm

only

Hourly Time
Signal only

To test the alarm

In the Alarm Mode, hold down to sound the alarm.

Holding down to test the alarm also changes the Daily Alarm or Hourly Time
Signal on/off settings.

Mode
indicator

Current
time

Alarm on
indicator

Hourly time signal
on indicator

Hour

AM indicator

Minutes

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 at 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

1/100 second

Minutes

Seconds

Hours

DUAL TIME MODE

The Dual Time Mode lets you keep track of the time in
another time zone.

To set the dual time

Press to increase the time by 30 minutes.

Holding down changes at high speed.
Press to set current time as the dual time. You can
then make any changes you want.
The format (12-hour and 24-hour) of the Dual Time
matches the format you select in the Timekeeping
Mode.

Changing the Timekeeping Mode setting causes a corresponding change in the
Dual Time Mode time. If you ever need to change the Timekeeping Mode setting
(say to set the time back three hours when you move from New York to Los
Angeles), you should then make the necessary adjustment to the Dual Time Mode
time (setting it back three hours, in this case).

Seconds

Home time

Hour

Mode indicator

AM indicator

Minutes

C

C

C

D

D

D

D

D

D

D

D

D

D

D

B

B

B

B

B

A

A

A

A

A