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Casio MO0804-EA Operation Manual

Casio watch user manual



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.
• This watch does not have a time zone that corresponds to the
Greenwich Mean Time differential of –3.5 hours. Because of this, the
radio-controlled timekeeping and World Time functions will not display
the correct time for Newfoundland, Canada.
Keep the watch exposed to bright light
Bright light
Solar cell
• The watch continues to operate, even when it is not exposed to light.
Leaving the watch in the dark can cause the battery to run down, which will
result in some watch functions being disabled. If the battery goes dead, you
will have to re-configure watch settings after recharging. To ensure normal
watch operation, be sure to keep it exposed to light as much as possible.
Battery charges in the light.
Bright light
Solar cell
(Converts light to
electrical power.)
Rechargeable battery
General Guide
• The illustration below shows which buttons you need to press to navigate
between modes.
• In any mode, press L to illuminate the display.
World Time
Stopwatch Mode
Timer Mode

Radio-controlled Atomic Timekeeping

This watch receives a time calibration signal and updates its time setting
• This watch is designed to pick up the time calibration signals transmitted in
Germany (Mainflingen), England (Anthorn), the United States (Fort Collins)
and Japan.
• See the information under "Signal Reception Troubleshooting" if you
experience problems with time calibration signal reception.
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.
• The first thing you should do after purchasing this watch is to specify
your Home City (the city where you normally will use the watch). For
more information, see "To specify your Home City" below.
Operation Guide 3143
The electricity generated by the solar cell of the
watch is stored by a built-in battery. Leaving or
using the watch where it is not exposed to light
causes the battery to run down. Make sure the
watch is exposed to light as much as possible.
• When you are not wearing the watch on your
wrist, position the face so it is pointed at a
source of bright light.
• You should try to keep the watch outside of
your sleeve as much as possible. Charging is
reduced significantly if the face is covered only
Battery discharges in the dark.
Timekeeping Mode
Data Recall
Press C.
Alarm Mode
Receive Mode
• The actual level at which some functions are disabled depends on the
watch model.
• Frequent display illumination can run down the battery quickly and require
charging. The following guidelines give an idea of the charging time
required to recover from a single illumination operation.
Approximately five minutes exposure to bright sunlight coming in through
a window
Approximately 50 minutes exposure to indoor fluorescent lighting
• Be sure to read "Power Supply" for important information you need to
know when exposing the watch to bright light.
If the display of the watch is blank...
If the display of the watch is blank, it means that the watch's Power Saving
function has turned off the display to conserve power.
• See "Power Saving" for more information.
The built-in sensors of this watch measure barometric pressure, temperature
and altitude. Measured values are then shown on the display. Such features
make this watch useful when hiking, mountain climbing, or when engaging in
other such outdoor activities.
• The measurement functions built into this watch are not intended for
taking measurements that require professional or industrial precision.
Values produced by this watch should be considered as reasonable
representations only.
• CASIO COMPUTER CO., LTD. assumes no responsibility for any loss,
or any claims by third parties that may arise through the use of this
About This Manual
• You can use buttons B and D to enter a sensor mode directly from the
Timekeeping Mode or from another sensor mode. To enter a sensor mode
from the Data Recall, World Time, Stopwatch, Countdown Timer, Alarm, or
Receive Mode, first enter the Timekeeping Mode and then press the
applicable button.
Press B.
• When using the watch outside the areas covered by the time signal
transmitters, you will have to adjust the current time setting manually as
required. See "Timekeeping" for more information about manual time
• The U.S. time calibration signal can be picked up by the watch while in
North America. The term "North America" in this manual refers to the area
that consists of Canada, the continental United States, and Mexico.
• 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"
Sensor Modes
Press D.
Thermometer Mode
Altimeter Mode
Press C.



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Summary of Contents for Casio MO0804-EA

  • Page 1: Radio-Controlled Atomic Timekeeping

    MO0804-EA 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. • This watch does not have a time zone that corresponds to the Greenwich Mean Time differential of –3.5 hours. Because of this, the radio-controlled timekeeping and World Time functions will not display the correct time for Newfoundland, Canada.
  • Page 2 14 minutes. Take care that you do not perform any button operations or move the watch during this time. • The time calibration signal the watch will attempt to pick up depends on its current Home City code setting as shown below.
  • Page 3 • The Level 5 receiving indicator is displayed only when the watch is able to receive both time and date data successfully. It does not appear when only time data is received.
  • Page 4: Altimeter

    When you measure altitude using a reference altitude specified by you Not visible on After you specify a reference altitude, the watch uses that value to convert the the display. current measured barometric pressure value to altitude.
  • Page 5 The following operation is performed simultaneously with the operation described under “How periodic records are created and saved”. a. When you hold down D to start a save session, the watch will clear data that is already stored in the current session record.
  • Page 6: Recalling Altitude Data

    • “-- -- --” is displayed in place of the altitude differential value whenever the measured value is outside the allowable range. • The watch will assume that the reference altitude setting is zero for the first measurement after you exit the Altimeter Mode setting screen.
  • Page 7: Countdown Timer

    Turning on the auto light switch causes illumination to turn on, whenever you position your wrist as described below in any mode. Note that this watch features a “Full Auto EL Light”, so the auto light switch operates only when available light is below a certain level. It does not illuminate the display under bright light.
  • Page 8: Questions And Answers

    –11°C charge. If you experience problems getting the special rechargeable battery to charge fully, contact your dealer or CASIO distributor about having it –4.5°C About 6.5°C replaced.
  • Page 9: Charging Precautions

    Home City (the city where you normally use the watch). If your location is not included in the preset city codes, select the preset city code that is in the same time zone as your location.
  • Page 10 To recover from the sleep state Perform any one of the following operations. • Move the watch to a well-lit area. It can take up to two seconds for the display to turn on. • Press any button.
  • Page 11 This does not necessarily indicate malfunction. • You may notice a very faint clicking sound coming from the watch when it is shaken back and forth. This sound is caused by mechanical operation of the auto light switch, and does not indicate a problem with the watch.
  • Page 12: City Code Table

    * In December 2007, Venezuela changed its offset from –4.0 to –4.5. Note, however, that this watch displays an offset of –4.0 (the old offset) for the CCS (Caracas, Venezuela) city code.

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