Casio 2839 Operation Manual Download Page 1

Operation Guide 2839

1

MA0312-EA

Power Saving

Power Saving causes the watch to automatically enter a sleep state to save power whenever the watch is left in the dark. The Power
Saving feature is turned on at the factory.

Note that the watch may also enter the sleep state if the watch is blocked from light by your sleeve.

How the sleep state works

Display sleep state
The display sleep state is triggered whenever the watch is left in
the dark for about one hour between the hours of 10 p.m. and 6
a.m.

The display goes blank and a SLEEP indicator flashes on the
display. Alarms and the hourly time signal continue to operate
normally while the watch is in the display sleep state.

The watch does not enter the sleep state if it is in the
Stopwatch Mode.

 SLEEP Indicator

Function sleep state
The function sleep state is triggered whenever the watch is left
in the dark for six or seven days.

The SLEEP indicator stops flashing and remains on the display.
Alarms and the hourly time signal are also disabled while the
watch is in the function sleep state. Time calibration signal
reception is not performed while the watch is in the function
sleep state.

Timekeeping continues internally in the function sleep state.

To recover from the sleep state

Place the watch in an area that is well-lit, press any button, or
angle the watch toward your face to illuminate the display using
the Auto Light (see “To illuminate the display”).

It can take up to two seconds before display figures re-appear
after you place the watch in a well-lit area.

To turn Power Saving on and off

Use the procedure under “Configuring Time and Date Settings
Manually” to turn Power Saving on or off.

The watch automatically enters the sleep state if left in a
desk drawer or some other dark place for a long time while
Power Saving is turned on.

Modes and Display Screens

The watch will automatically revert to the Timekeeping Mode if you leave it in the Alarm Mode or Recall Mode without performing any
operation for about two or three minutes.

In the Alarm Mode, an alarm number, the snooze alarm indicator (SNZ), or the hourly time signal indicator (SIG) identifies the currently
displayed screen.

Timekeeping Mode

(Light)

Hour, Minute, 
Second

Month, Day

SUN: Sunday   

MON: Monday    TUE: Tuesday  

WED: Wednesday   THU: Thursday   FRI: Friday  
SAT: Saturday

❚ 

Days of the Week 

Day of the Week 

PM indicator 
(no indicator 
for AM)

Recorded hour 
and minute

Current time

Record number flashes 
for about three seconds. 

❚  

Time Stamp (Time Memo)

Holding down the 

 button for about one second 

in the Timekeeping Mode creates a record 
containing the current date (month and day) and 
time (hour, minute, second) in memory. Storage 
of the record is indicated by the watch beeping. 

•  

The display shows the contents of the record 
for about two seconds, after which the normal 
Timekeeping Mode display reappears.  

•  

See “Viewing Time Stamp (Time Memo) Data” 
for information about recalling Time Stamp 
records.

World Time Mode

Recall Mode

Stopwatch Mode

Alarm Mode

City Code

Alarm Number

Mode Indicator

Mode Indicator

Summary of Contents for 2839

Page 1: ...ate the display It can take up to two seconds before display figures re appear after you place the watch in a well lit area To turn Power Saving on and off Use the procedure under Configuring Time and Date Settings Manually to turn Power Saving on or off The watch automatically enters the sleep state if left in a desk drawer or some other dark place for a long time while Power Saving is turned on ...

Page 2: ...ging times are for reference only Actual charging time depends on a variety of environmental factors Required Daily Charging Time The following is the daily amount of charging required each day to support the operations under Daily Use Exposure Level Brightness Outdoor Sunlight 50 000 lux 5 minutes 24 minutes 48 minutes 8 hours Approximate Exposure Time Sunlight Through a Window 10 000 lux Dayligh...

Page 3: ...ning etc Reception Range This watch is designed to receive the standard time calibration signal of Japan JJY or of the United States WWVB The signal that is received depends on the current Home City setting For information about city codes see the Selecting Your Home City Home City TYO LAX DEN CHI NYC Transmitter Either the Mt Otakadoya signal 40kHz or the Mt Hagane signal 60kHz Fort Collins Color...

Page 4: ...d setting C C C C C Button Moves the flashing between settings D D D D D Button Scrolls forward through the options at the flashing selected setting 2 Press the C C C C C button once to select the Home City setting The currently selected city code will be flashing on the screen 3 Use the D D D D D and B B B B B buttons to scroll through the city codes until the one you want to select is displayed ...

Page 5: ...in range of the transmitter Proper reception may be impossible if there is something blocking the signal If reception is unsuccessful try again This watch is designed to adjust its current time setting in accordance with the calibration signal transmitted in Japan and the United States only Note that you will need to make your own adjustments when using this watch outside of Japan or the United St...

Page 6: ...button This will display the date and time that the time calibration signal was last received successfully To return to the Timekeeping Mode press the D button again When you enter the World Time Mode the screen for the city that was displayed when you last exited the mode appears first Time in World Time City City Code Time in Home City Once Timekeeping Mode After you set the current time for the...

Page 7: ...to beep twice every hour on the hour When you enter the Alarm Mode the screen for the alarm that was displayed when you last exited the mode appears first Alarm Time Alarm Number Current Time Three Times Timekeeping Mode To select an alarm or the Hourly Time Signal screen Each press of the D button cycles through available screens in the sequence shown below Alarm 1 Alarm 2 Alarm 3 Alarm 4 Hourly ...

Page 8: ...nd auto receive settings To configure time and date settings manually 1 In the Timekeeping Mode hold down the A A A A A button for about two seconds This will cause the watch to beep and display the transmitter selection mode setting screen A A A A A Button Displays the setting screen Changes from the first setting group to the next Exits the setting screen B B B B B Button Scrolls back through th...

Page 9: ...me Stamp records The record that was on the display the last time you exited the Recall Mode appears first Mode Indicator About two seconds Recall Mode Twice Timekeeping Mode To search for Time Stamp data In the Recall Mode use the D D D D D and B B B B B buttons to scroll through Time Stamp records Holding down either button scrolls at high speed B B B B B Button Scrolls in the direction of newer...

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