Casio MO0804-EA User Manual

MO0804-EA

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Operation Guide 5036

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully.

Starting second hand movement and digital display

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Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any
damage or loss suffered by you or any third party arising through the use of this
product or its malfunction.

General Guide

• Press C to change from mode to mode.

• About 1.5 seconds after you enter the Dual Time Mode, Alarm Mode, or Home

Position Adjustment Mode the hands will move the position that indicates the current
setting of the mode. You cannot change to another mode while the hands are
moving. To change to another mode, either press C before the hands start to move,
or wait until the hands stop before pressing C.

• In the Timekeeping Mode (except when a setting screen is on the display), press B

to illuminate the face of the watch.

To conserve battery power, the watch is shipped from the

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factory with its functions disabled. Pressing any one of the

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watch’s three buttons will activate its functions, which will
cause the second hand to start moving and the digital
display to activate.

Timekeeping Mode

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Press C.

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About This Manual

Stopwatch 1/20 second hand

Hour hand

Minute hand

• Button operations are indicated using the letters shown
in the illustration.

• Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.

Date

Stopwatch
minute hand

24-Hour hand

Second hand
(Timekeeping/
Stopwatch)

Stopwatch Mode

▲

Home Position

Adjustment Mode Alarm Mode

Dual Time Mode

▲

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Radio-controlled Atomic Timekeeping

Long-wave
time
calibration
signal

Transmitter

• See the information under “Signal Reception Troubleshooting” if you experience
problems with time calibration signal reception.

Chinese Time Calibration Signal

The Chinese time calibration signal (BPC) is maintained by the National Time Service
Center (http://www.ntsc.ac.cn/) of the Chinese Academy of Sciences, and is
transmitted from a transmitter (68.5 kHz) located in Shangqiu. The time data of the
Chinese time calibration signal is maintained by the National Time Service Center.

• Note that transmission of the calibration signal may be interrupted occasionally due
to maintenance, lightning, etc.

Current Time Setting

This watch adjusts its time setting automatically in accordance with a time calibration
signal. You also can perform a manual procedure to set the time and date, when
necessary.

• Whenever you need to travel outside of the time zone where Beijing is located
(UTC+8), use the procedure under “To select your Home Time Zone” to change the
watch’s Home Time Zone setting as required.

• When using the watch outside the range of the time calibration signal transmitter,
you have to adjust the current time setting manually as required. See “Timekeeping”
for more information about manual time settings.

• Even if the time calibration signal is received correctly, there are some times when
the analog hands may not indicate the correct time. If this happens, use the
procedures under “Adjusting the Home Positions” to check the home positions of the
hands, and make adjustments as required.

To select your Home Time Zone

UTC offset value

3. Press A to exit the setting mode.

• The second hand will return at high speed to the applicable current time position and
resume normal timekeeping.

Your watch receives a time calibration signal and updates
its time setting accordingly.

• This watch is designed to receive the time calibration
signal transmitted from Shangqiu City, Henan Province,
China (Call Sign: BPC, Frequency: 68.5 kHz).

• Your watch will be able to receive the signal whenever
Beijing (UTC+8) is selected as its Home Time Zone, and
the watch is within range of the transmitter. The initial
factory Home Time Zone setting of the watch is Beijing
(UTC+8), so you will not need to change the setting if
you are in the same time zone (UTC+8) as Beijing.

• As of January 2008, China does not use Daylight Saving
Time (DST). If China does go to the Daylight Saving

Watch

Time system in the future, some functions of this watch
may no longer operate correctly.

1. In the Timekeeping Mode, hold down A until the UTC

offset value starts to flash. This is the setting mode.

• At this time the second hand will move at high speed
to the 12 o’clock position and stop there.

• The UTC offset value shows the difference in hours

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between the currently selected time zone and

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Coordinated Universal Time.

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• The DST indicator shows whether Daylight Saving
Time (summer time) currently is being applied in the
currently selected time zone.

2. Use B (+) to scroll through available time zones.

• For information about time zones, see the “Time
Zone Table”.

• If you want the watch to receive the Chinese time
calibration signal, select 8.0 (UTC+8, Beijing) as your
Home Time Zone.

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Time Calibration Signal Reception

There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.

• Auto Receive

With auto receive, the watch receives the time calibration signal automatically up to
five times a day. When any auto receive is successful, the remaining auto receive
operations are not performed. For more information, see “About Auto Receive”.

• Manual Receive

Manual receive lets you start a time calibration receive operation with the press of a
button. For more information, see “To perform manual receive”.

Important!

• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o’clock side facing towards a window.
This watch is designed to receive a time calibration signal late at night. Because of
this, you should place the watch near a window as shown in the illustration when you
take it off at night. Make sure there are no metal objects nearby.

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12 o’clock

or

• Make sure the watch is facing the right way.

• Proper signal reception can be difficult or even impossible under the conditions listed

below.

Changchun

Among or
behind
mountains

Inside or
among
buildings

• Signal reception normally is better at night than during the day.

• Time calibration signal reception takes from two to seven minutes. Take care that

you do not perform any button operations or move the watch during this time.

Inside a
vehicle

Approximate Reception Range

1,500 km

Near
household
appliances,
office
equipment,
or a mobile
phone

Beijing

Near a
construction
site, airport,
or other
sources of
electrical
noise

Near high­tension
power lines

500 km

Shangqiu

Shanghai

Chengdu

Hong Kong

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Operation Guide 5036

• At distances further than about 500 kilometers from the Shangqiu (China)
transmitter, signal reception may not be possible during certain times of year or
times of day. Radio interference may also cause problems with reception.

• Even when the watch is within the reception range of the transmitter, signal
reception will be impossible if the signal is blocked by mountains or other geological
formations between the watch and signal source.

• Signal reception is affected by weather, atmospheric conditions, and seasonal
changes.

About Auto Receive

The watch starts to receive the time calibration signal automatically when the time in
the Timekeeping Mode reaches 1:00 a.m., 2:00 a.m., 3:00 a.m., 4:00 a.m., and 5:00
a.m. each day (calibration times). When any auto receive is successful, the remaining
auto receive operations are not performed.

Note

• Auto receive normally is performed when a calibration time is reached while the
watch is in the Timekeeping Mode and Dual Time Mode. The receive operation is not
performed if you are performing a button operation.

• Auto receipt of the calibration signal is designed to be performed early in the
morning, while you sleep (provided that the Timekeeping Mode time is set correctly).
Before going to bed for the night, remove the watch from your wrist, and put it in a
location where it can receive the signal easily.

• The watch receives the calibration signal for two to seven minutes when the time in
the Timekeeping Mode reaches a calibration time. Do not perform any button
operation within seven minutes before or after any one of the calibration times. Doing
so can interfere with correct calibration.

• Remember that reception of the calibration signal depends on the current time in the
Timekeeping Mode.

To perform manual receive

R (READY)

W (WORK)

Note

• To interrupt a receive operation and return to the Timekeeping Mode, press any
button.

• If reception is not successful, the second hand will move to N (NO). Five seconds
later, the second hand will resume normal operation, without any adjustment of the
hand setting.

• If the second hand is pointing to Y (YES) or N (NO), you can return to the
Timekeeping Mode by pressing A.

Viewing the Latest Signal Reception Results

You can use the procedure below to check whether or not the last signal receive
operation was successful.

To check the latest signal reception results

Signal Reception Troubleshooting

Check the following points whenever you experience problems with signal reception.

The second
hand is
pointing at N
(NO).

The time
setting is
incorrect
following
signal
reception.

• For further information, see “Important!” under “Time Calibration Signal Reception”
and “Radio-controlled Atomic Timekeeping Precautions”.

• You changed the time setting

• You performed some button

• The watch is not in the

• Signal reception results are reset

• Radio interference is often

• The home position of the hands is

1. Place the watch on a stable surface so its 12 o’clock
side is facing towards a window.

2. In the Timekeeping Mode, hold down A for about two
seconds until the watch beeps.

• The second hand will move to R (READY) to indicate

that the watch is setting up for time calibration reception.

• The second hand will move to W (WORK) and stay there

while actual reception is in progress.

• If signal reception is unstable during reception, the

second hand may move between W (WORK) and R
(READY) .

Y (YES)

• The hour and minute hands continue to keep time

normally.

• Time calibration signal reception takes from two to

seven minutes. Take care that you do not perform any
button operations or move the watch during this time.

• If reception is successful, the second hand will move to

Y (YES). Five seconds later, the hands will move to the

N (NO)

correct time.

In the Timekeeping Mode, press A.

• Whenever the watch successfully performs any signal

receive operation from 1:00 a.m. onwards, the second
hand will move to Y (YES). If the watch has been unable
to receive any signal successfully, the second hand will
move to N (NO).

• The watch will return to the Timekeeping Mode after five

seconds or when you press A.

• The current receive result is cleared when the first auto

receive operation is performed on the following day. This
means Y (YES) indicates successful signal reception
since the start of the current day.

• If you adjust the time or date setting manually, the

second hand will move to N (NO).

What you should doProblem Probable Cause

• Perform manual signal receive

manually.

operation during the auto receive
operation.

Timekeeping or Dual Time Mode.

at 1:00 a.m. each day.

present during the day time, which
can interfere with calibration
signal reception.

off.

at night or wait until the next
auto signal receive operation
is performed.

• Enter the Timekeeping or Dual
Time Mode and try again.

• Check to make sure the watch
is in a location where it can
receive the signal.

• Enter the Home Position
Adjustment Mode and adjust
the home position.

Stopwatch

Stopwatch 1/20 second hand
* This hand rotates and indicates
the second count during the first
60 seconds.

Second hand

Stopwatch minute
hand

To measure elapsed time

1. Press B to start the stopwatch.

2. Press B to stop the stopwatch.

• You can resume the measurement operation by pressing B again.

• The 1/20 second hand rotates during the first 60 seconds only, and then stops.

3. Check the elapsed time.

• Press A to reset the stopwatch. Resetting the stopwatch causes the stopwatch

1/20-second hand and the second hand to move to 12 o’clock, and the digital display
to reset to zero.

Stopwatch
1/100 second

When elapsed timing is stopped (by pressing B), this hand jumps to the 1/20
second indication (which is kept internally).

The stopwatch lets you measure elapsed time.

• The display range of the stopwatch is 59 minutes, 59.99
seconds.

• Entering the Stopwatch Mode causes the second hand,
the stopwatch minute hand and stopwatch 1/20 second
hand to move to the 12 o’clock position.

• The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.

• The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.

• All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing C.

Dual Time

The Dual Time Mode lets you view the current time in 29
time zones around the world.

• Time zones are indicated on the digital display by their
UTC offset values.

• For full information on time zones, see the “Time Zone
Tab l e” .

• The watch will perform a signal receive operation even if
it is in the Dual Time Mode when a calibration time is
reached. If this happens, the Dual Time Mode time
settings will be adjusted in accordance with the current
time in the Timekeeping Mode’s Home Time Zone.

• All of the operations in this section are performed in the

UTC offset value (+1.0)

To view the time in another time zone

While in the Dual Time Mode, press B to scroll eastward through time zones.

• When you release B, the hands will move to the current time in that time zone after

about one second.

• If the current time shown for a time zone is wrong, check the Timekeeping Mode
time setting and your Home Time Zone setting, and make the necessary changes.

To toggle a time zone between Standard Time and Daylight Saving Time

• The DST indicator appears on the display whenever you display a time zone for
which Daylight Saving Time is turned on.

• The DST/Standard Time setting you configure affects only the currently displayed
time zone. Other time zones are not affected.

• Note that you cannot use the Dual Time Mode to change the DST setting of the
Home Time Zone you currently have selected in the Timekeeping Mode. See “To
change the Daylight Saving Time (summer time) setting” for information about
turning the Home Time Zone DST setting on and off.

• The
Standard Time and Daylight Saving Time.

DST indicator

(UTC: Coordinated Universal Time) time zone cannot be switched between

Dual Time Mode, which you enter by pressing C.

1. In the Dual Time Mode, use B to display the time zone

whose Standard Time/Daylight Saving Time setting you
want to change.

2. Hold down A to toggle between Daylight Saving Time

(DST indicator displayed) and Standard Time (DST
indicator not displayed).

• Turning on DST causes the UTC offset value to be
increased by one.

Alarm

Alarm time minute hand

Alarm time 24­hour hand

Alarm time
hour hand

Alarm Operation

The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in.

• Alarm operations are performed in accordance with the Timekeeping Mode time.

• Pressing any button stops the alarm tone operation.

To toggle an alarm on and off

In the Alarm Mode, press B to toggle the alarm on (ON) and off (OF).

• The watch will beep when you turn on the alarm.

On/Off status

When the alarm is turned on, the alarm sounds when the
alarm time is reached.

• All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.

To set an alarm time

1. In the Alarm Mode, hold down A for two seconds to

display the setting mode.

2. Use B to change the alarm time.

• Press B to move the hands clockwise in one-minute

steps.

3. After setting the alarm time, press A to exit the setting

mode.

• Setting the alarm time causes the alarm to turn on
automatically.

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