Casio MA0804-EC User Manual

MA0804-EC

Before using the watch...

Operation Guide 5012 (OC)

Expose the watch to light.

Your watch runs on electrical power generated from light, which is stored by a chargeable battery. Long-term storage of the watch can cause the battery to run low, so be sure to expose the watch to light before using it for the first time. See “Solar Charging” for more information.

Low Battery Alert

When secondary battery power is low, the second hand of the watch will jump at 2-second intervals to let you know that charging is required.

• See “Low Battery Alert” for more information.

Jumps at 2-second intervals.

Modes and Indicators

• To toggle between the Timekeeping Mode and Stopwatch Mode, press the D button.

Power Saving

Power Saving causes the watch to enter a sleep state automatically and stop movement of the analog hands in order to save power whenever the watch is left in the dark. The watch will exit the sleep state if you expose it to light or perform any button operation.

• Though the hands are stopped, the watch continues to keep time internally.

• Note that the watch also may enter the sleep state and stop if the solar panel is blocked from light by your sleeve.

Sleep Level 1

Sleep Level 1 is triggered whenever the watch is left in the dark for about one hour any time between the hours of 10 p.m. and 6 a.m.

In Sleep Level 1:

• The second hand is stopped.

• The hour hand, 24-hour hand, minute hand, and day indicator

continue to operate normally.

• Auto Receive is performed normally.

Sleep Level 2

Sleep Level 2 is triggered whenever the watch is left in the dark while in Sleep Level 1 for six or seven days.

In Sleep Level 2:

• The hour hand, 24-hour hand, and minute hand are stopped.

• If the watch reaches Sleep Level 2 while in the World Time Mode,

the hands will move to 12 o’clock and stop when the Home City time (kept internally) reaches midnight.

• Auto Receive is disabled.

• The day indicator continues to operate normally.

The shape and markings of the face depend on the watch model.

• To toggle between the Timekeeping Mode and World Time Mode,

press the C button.

• About 1.5 seconds after you enter the World Time Mode, the watch’s hands will start to move to the current World Time. Note that the only operation you can perform while the hands are moving is changing to another mode.

Timekeeping Mode Stopwatch Mode

Indicator hand

Hour hand

Button

24-hour hand

Second hand

Day

For more information, see “How a Radio-controlled Watch Works”.

Minute hand

Button

Day of the week hand

ButtonButton

(While reset.)

Second hand

• Start

• Stop

Minute hand

1/20-second hand 1/20-second timing is performed only for the first minute after you start or restart an elapsed time measurement.

• You also can start a stopwatch elapsed time operation from the Timekeeping Mode by pressing the button.

• Reset

Timekeeping Mode World Time Mode

City code

30 30

Operation Guide 5012 (OC)

Solar Charging

Your watch runs on electrical power generated from light, which is stored by a chargeable battery. To ensure stable operation, make sure that the watch is exposed to light as much as possible.

• Whenever you are not wearing the watch on your wrist, position it so the face (solar cell) is pointed in the direction of a source of bright light.

Solar cell

Leave the watch under fluorescent lighting, near a window, etc.

• When wearing the watch, try to keep your clothing from blocking its face, where the solar cell is located.

Charging efficiency is reduced significantly even if the face of the watch is covered only partially by your sleeve.

Charging Guide

••

• The tables in this section provide some guidelines about the

••

amount of time required each day to ensure stable operation of the watch.

• The following values assume six minutes of calibration signal reception per day.

Exposure Level (Brightness)

Outdoor Sunlight (50,000 lux)

Sunlight Through a Window (10,000 lux)

Daylight Through a Window on an Overcast Day (5,000 lux)

Indoor Fluorescent Lighting (500 lux)

• Stable operation is enabled by frequent charging.

Light

Charging Time

8 minutes

30 minutes

48 minutes

8 hours

While the watch is exposed to light...

Solar cell

Light

(Light charges the battery.)

Electrical energy

Rechargeable battery

Power supplied to watch

Charge

While the watch is not exposed to light...

Discharge

Your watch continues to operate even when it is not exposed to light. Leaving the watch in the dark can run down its battery and cause functions to become disabled.

••

• Approximate Charge Times Required to Advance to a Higher

••

Level

Exposure Level

(Brightness)

Outdoor Sunlight (50,000 lux)

Sunlight Through a Window (10,000 lux)

Daylight Through a Window on an Overcast Day (5,000 lux)

Indoor Fluorescent Lighting (500 lux)

• Note that the above charging times are for reference only. Actual charging time depends on a variety of environmental factors.

Rechargeable battery

Power supplied to watch

1 hour

2 hours

4 hours

34 hours

Charging Time

20 hours

73 hours

−−−

Until Hand Movement Restarts Until Full Charge

Recover Mode

If you use calibration signal receive or any other function that puts a large load on the battery, the hands will stop. At this time the following operations are disabled in order to allow battery power to recover.

• Stopwatch elapsed timekeeping

• Time calibration signal reception

Normal operation will return after the battery recovers.

Low Battery Alert

When secondary battery power is low, the second hand of the watch will jump at 2-second intervals to let you know that charging is required.

• Even if the battery level drops to the point that timekeeping stops, you still will be able to recharge the battery and use the watch again.

• When you recharge the battery after it drops to a level where timekeeping stops, the hands will move automatically to the current time setting.

• Try to keep the watch exposed to light as much as possible during normal use.

Charging Precautions

Avoid charging the watch in the following locations, and anywhere else where it may become very hot.

• On the dashboard of an automobile parked in the sun

• Very close to an incandescent light source or other sources

of heat

• In a location exposed to direct sunlight for long periods Depending on the light source you are using, the case of the watch may become quite hot when charging. Take care to guard against burn injury after charging.

Jumps at 1-second

intervals.

Jumps at 2-second intervals.

Normal operation

When battery runs low

Low battery alert

Home Position

If power drops even more...

Disabled state

At midnight, the day indicator will change to 1 (which is the home position).

Important!

The following function is disabled when battery power is low.

• Auto receive and manual receive

Hands stop at 12 o’clock.

The second hand, hour hand, 24-hour hand, and minute hand all stop at 12 o’clock.

Operation Guide 5012 (OC)

How a Radio-controlled Watch Works

What is a radio-controlled watch?

A radio-controlled watch is designed to receive a time calibration signal that contains standard time data and adjust its current time setting accordingly.

Transmitter

Cesium

atomic clock

After the watch receives the Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the displayed time.

Long-wave time calibration signal

Watch

Reception Time

A receive operation can take anywhere from about two to seven minutes.

• Under certain conditions, a receive operation can take as long as 13 minutes.

Positioning the Watch for Best Reception

Remove the watch from your wrist and place it somewhere so its top (12 o’clock side, where the antenna is located) is facing approximately in the direction of the signal transmitter. Keep the watch away from metal objects.

Calibration Signal

• The Japanese calibration signal (Call Sign: JJY) is maintained by the National Institute of Information and Communications Technology (NICT). It is transmitted 24 hours a day from the Mt. Otakadoya transmitter (40 kHz) located in Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane transmitter (60 kHz) located on the border between Saga Prefecture and Fukuoka Prefecture.

• The U.S. calibration signal (Call Sign: WWVB) is transmitted by the National Institute of Standards and technology from Fort Collins, Colorado.

• The U.K. calibration signal (Call Sign: MSF) is transmitted by the National Physical Laboratory (NPL) from Anthorn, which is located near Anthorn, Cumbria.

• The German calibration signal (Call Sign: DCF77) is transmitted by Physikalisch - Technische Bundesanstalt (PTB) in Mainflingen, which is located southeast of Frankfurt.

• Time calibration signal frequencies and transmitter locations are subject to change.

The time data of the Japanese calibration signal (Call Sign: JJY) is maintained by the Japan Standard Time Group of the National Institute of Information and Communications Technology (NICT). Note that transmission of the calibration signal may be interrupted occasionally due to maintenance, lightning, etc. For more information, visit the website of the Japan Standard Time Group of the National Institute of Information and Communications Technology (NICT) at the following URL.

http://jjy.nict.go.jp

• Note that the above URL is subject to change.

Important!

Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.

• You should think of your watch as operating like a radio or TV when it is receiving the calibration signal.

Among or near buildings

Near high-voltage lines

Inside an automobile, train, plane, or other vehicle

Reception Ranges

The table below shows the time calibration signal that the watch receives when a particular city code is selected as your Home City.

••

• For information about Home City settings, see “Configuring

••

Home City Settings”. See the “City Code List” for information about city codes.

Home City

(Supports signal reception)

TYO, HKG

HNL, ANC, LAX,

DEN, CHI, NYC

LON, PAR, ATH

• Signal reception is possible in the time zones represented by HKG (Hong Kong), HNL (Honolulu), and ANC (Anchorage) when reception conditions are good.

• Certain conditions can make reception impossible even when the watch is within one of the reception ranges shown above. Signals become weaker outside of the smaller circles indicated by dashed lines in the nearby maps, so the reception environment has a greater effect on signal reception.

• The following also can affect signal reception: geographic contours, structures, weather, climate, time of day (afternoon, evening), noise.

Receivable Transmitter

Japan (JJY)

United States (WWVB)

U.K. (MSF) and Germany (DCF77)

Auto Receive

Getting Ready for Auto Receive

You will need to perform the operations described below in order to use Auto Receive.

• Configure the Home City setting of the Timekeeping Mode so it matches your current location. The Home City must be in a time zone where calibration signal reception is supported. See: “Reception Ranges” and “Configuring Home City Settings”.

• Put the watch into the Timekeeping Mode or World Time Mode. See: “Modes and Indicators”.

• During the Auto Receive times, position the watch correctly for best reception. See: “Auto Receive Start Times” (below) and “Positioning the Watch for Best Reception”.

Transmitter Locations

1000km

Japan (JJY)

Mt. Hagane (60kHz)

1000km

500km

Mt. Otakadoya (40kHz)

United States (WWVB)

Fort Collins

1000km

3000km

U.K. (MSF), Germany (DCF77)

1500km

Anthorn

500km

The signal transmitted out of Anthorn may be receivable within this range.

Mainflingen

How Auto Receive Works

Calibration signal reception will start automatically whenever the current time in the Timekeeping Mode reaches one of the Auto Receive Start Times listed below. Auto receive can be performed up to six times a day, but any time a signal receive operation is successful, no more auto receive operations are performed that day. Note that the Auto Receive Start Times differ according to the current Home City setting and the summer time setting.

• Summer time, or Daylight Saving Time (DST) as it is called in some countries, calls for setting clocks ahead one hour from standard time during the summer season.

• Note that the start and end of summer time, and whether summer time is used at all depends on each country.

Resin band

Metal band

• Orienting the watch so it is sideways to the transmitter makes it more difficult for the watch to receive the signal.

• Do not move the watch while it is receiving the calibration signal.

Next to a TV, speaker, fax, computer, cellphone, or other household appliances or office equipment

If you are experiencing problems with reception, move away from the types of locations described above to a location with better reception, and try again.

At a construction site, airport, or other location where there is radio interference

Near mountains

Receiving a Calibration Signal

There are two methods you can use in order to receive the time calibration signal.

• Auto Receive up to six times per day

• Manual Receive where you hold down the A button in the

Timekeeping Mode.

Auto Receive Start Times

Home City

TYO, HKG

HNL, ANC, LAX, DEN, CHI, NYC

LON

PA R

AT H

* Following day

Standard Time

Standard Time Summer Time

Standard Time

Summer Time

Standard Time

Summer Time

Standard Time

Summer Time

Midnight

1:00 a.m.

2:00 a.m.

3:00 a.m.

4:00 a.m.

1:00 a.m.

2:00 a.m.

3:00 a.m.

4:00 a.m.

5:00 a.m.

2:00 a.m.

3:00 a.m.

4:00 a.m.

5:00 a.m.

Midnight*

Auto Receive Start TimesAuto Receive Start Times

3:00 a.m.

4:00 a.m.

5:00 a.m.

Midnight*

1:00 a.m.*

4:00 a.m.

5:00 a.m.

Midnight*

1:00 a.m.*

2:00 a.m.*

5:00 a.m.

Midnight*

1:00 a.m.*

2:00 a.m.*

3:00 a.m.*

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