Casio 2790 User Manual
MA0309-EB
Operation Guide 2790
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to carefully read this manual and keep it on hand for later reference
when necessary.
Expose the watch to bright light to charge its battery before using it.
You can use this watch even as its battery is being charged by exposure to bright
light.
• Be sure to read “Battery” for important information you need to know when
exposing the watch to bright light.
If the digital display of the watch is blank...
If the Power Saving on indicator (PS) is on the display
(either flashing or not flashing), it means that the
display is blank because the watch’s Power Saving
function has turned off the display to conserve
power. Power Saving automatically turns off the display
and enters a sleep state whenever your watch is left for
a certain period where it is dark. If the watch is kept in
the dark for a longer period, the analog hands will also
stop moving after a few days.
• The initial factory default setting is Power Saving on.
• The watch recovers from the sleep state if you move it
to a well-lit area, if you press any button, or if you
angle the watch towards your face for reading.
• See “Power Saving Function” for more
information.
About This Manual
• Button operations are indicated using the letters shown
in the illustration.
• For the sake of simplicity, the sample displays in this
manual do not show the analog hands of the watch.
• 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.
General Guide
• Press B to change from mode to mode.
• In any mode, press L to illuminate the display.
Timekeeping Mode Alarm Mode Stopwatch Mode Dual Time Mode Hand Setting Mode
Press .
Timekeeping
This watch features both digital and analog timekeeping. Changing the digital time
setting causes the analog setting to be adjusted automatically to match the digital time.
• Whenever you need to adjust both the digital and the analog time settings, make
sure you adjust the digital setting first.
• In the Timekeeping Mode, press A to toggle the display between the date screen
and the time screen.
Date Screen
Hour hand
Month – Day
Day of week Seconds
Digital Time and Date
Use the Timekeeping Mode to set and view a digital display of the current time and
date. When setting the digital time, you can also specify the illumination duration.
To set the digital time and date
Seconds/Illumination duration
Day
Minute hand
Press .
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
• The hour hand and minute hand of the watch do not
move while the setting screen is on the display.
2. Press B to move the flashing in the sequence shown
below to select the other settings.
Hour
Month
Time Screen
Hour : Minutes
PM indicator
Minutes
Year
Seconds
3. When the setting you want to change is flashing, use C and L to change it as
described below.
Screen
To do this:
36
Reset the seconds to
Toggle illumination duration between three seconds
(3" displayed) and one second (3" not displayed)
10:08
P
Change the hour or minutes
2003
Change the year
6-30
Change the month or day
4. Press A to exit the setting screen.
• When you use the above procedure to set the digital display time, the hands of the
analog timepiece normally adjust according to your setting.
• For more information about illumination duration, see “Display Illumination”.
• Resetting the seconds to
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
00
reset to
• The day of the week is automatically displayed in accordance with the date (year,
• The year can be set in the range of 2000 to 2099.
• The watch’s built-in full automatic calendar makes allowances for different month
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press C to toggle between 12-hour timekeeping (indicated
by A or P on the display), or 24-hour timekeeping.
• With the 12-hour format, the P (PM) indicator appears on the display for times in the
• With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
• The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
without changing the minutes.
month, and day) settings.
lengths and leap years. Once you set the date, there should be no reason to change
it except after you have the watch’s battery replaced.
range of noon to 11:59 p.m. and the A (AM) indicator appears for times in the range
of midnight to 11:59 a.m.
any indicator.
applied in all modes.
00
00
while the current count is in the range of 30 to 59
Do this:
Press C.
Press L.
Press C (+).
1
Operation Guide 2790
Analog Timekeeping
The analog time of this watch is synchronized with the digital time. The analog time
setting is adjusted automatically whenever you change the digital time.
Note
• After you manually change the digital time setting, the hands of the analog timepiece
move clockwise to adjust to the new setting. If the analog time does not match the
digital time for any reason, use the procedure described under “To adjust the analog
time” to match the analog setting to the digital setting.
• Alarms, the Hourly Time Signal, and the display illumination are all disabled while
the analog hands are moving.
• Whenever you need to manually adjust both the digital and the analog time settings,
make sure you adjust the digital setting first.
• Depending on how much the hands have to move in order to adjust to the digital
time, it may take some time before the analog hands stop moving.
To adjust the analog time
• If you need to advance the analog time a long way, press C and L at the same
time. This locks the high speed hand movement, so you can release the two
buttons. High-speed hand movement continues until you press any button. It will
also stop automatically after the time advances 12 hours or if an alarm (daily
alarm or Hourly Time Signal) starts to sound.
4. Press A to exit the setting screen.
• To return to the Timekeeping Mode, press B.
1. In the Timekeeping Mode, press B four times to enter
the Hand Setting Mode.
2. Hold down A until the current digital time starts to
flash, which indicates the analog setting screen.
• Note that you will not be able to change to the setting
screen if the analog hands are moving because the
watch is automatically adjusting the analog time to
match the digital time. If this happens, wait until the
hands stop moving.
• The hour hand and minute hand of the watch do not
move while the setting screen is on the display.
3. Press C to advance the analog time setting by
20 seconds.
• Holding down C advances the analog time setting at
high speed.
Alarm
Alarm time
(Hour : Minutes)
Mode indicator
To set an alarm time
To stop the alarm tone after it starts to sound
Press any button.
To turn the Daily Alarm and Hourly Time Signal on and off
Alarm on indicator
Hourly time signal
on indicator
To test the alarm
In the Alarm Mode, hold down C to sound the alarm.
When the daily alarm is turned on, the alarm tone sounds
when the alarm time is reached.
You can also turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour.
• Alarm setting (and Hourly Time Signal setting) is
available in the Alarm Mode, which you enter by
pressing B.
Alarm Operation
The alarm tone sounds at the preset time for 10 seconds,
regardless of the mode the watch is in.
• Note that the alarm does not sound while the analog
hands are in motion to adjust in accordance with a
change made to the digital time setting in the
Timekeeping Mode.
1. In the Alarm Mode, hold down A until the hour setting
starts to flash, which indicates the setting screen.
• This operation automatically turns on the alarm.
2. Press B to move the flashing between the hour and
minutes.
3. While a setting is flashing, use C to increase it.
• With the 12-hour format, set the time correctly as a.m.
(A indicator) or p.m. (P indicator).
4. Press A to exit the setting screen.
In the Alarm Mode, press C to cycle through the on and
off settings as shown below.
Alarm On Indicator/Hourly Time Signal On Indicator
Both on Hourly Time
• The alarm on ( ) indicator flashes while the alarm is
sounding.
• The alarm on (
(
) indicator are displayed in all modes.
Daily alarm
Both off
only
) indicator and Hourly Time Signal on
Signal only
Stopwatch
Minutes
1/100 second
Mode indicator
To measure times with the stopwatch
Elapsed time
Start Stop Re-start Stop Clear
The stopwatch lets you measure elapsed time.
Seconds
• The display range of the stopwatch is 59 minutes,
59.99 seconds.
• 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 B.
Dual Time
Dual Time Mode lets you keep track of a time in a different time zone.
• In the Dual Time Mode, the seconds count is synchronized with the seconds count
of the current digital time.
Hour : Minutes
Seconds
Mode indicator
To set the Dual Time
1. Press B to enter the Dual Time Mode.
2. Hold down A until the hour setting starts to flash,
which indicates the setting screen.
3. Press B to move the flashing between the hour and
minutes settings.
4. Press C to increase the setting.
5. Press A to exit the setting screen.
Display Illumination
An LED (light-emitting diode) and a light guide panel
illuminate the display for easy reading in the dark. The
watch’s auto light switch automatically turns on display
illumination when you angle the watch for reading in the
dark.
• The auto light switch must be turned on (indicated by
the auto light switch indicator) for it to operate.
• See “Illumination Precautions” for more important
Three-second
indicator
Auto light switch indicator
To illuminate the display
In any mode, press L to turn on illumination.
• The above operation turns on illumination regardless of the current auto light switch
setting.
• You can use the procedure below to select either one second or three seconds as
the illumination duration. When you press L, the illumination will remain on for
about one second or three seconds, depending on the current illumination duration
setting.
To specify the illumination duration
1. In the Timekeeping Mode, hold down A until the seconds start to flash, which
indicates the setting screen.
2. While the seconds are flashing, press L to toggle the illumination duration
between three seconds (3" displayed) and one second (3" not displayed).
3. Press A to exit the setting screen.
• When the three-second setting is selected, the three-second (3") indicator remains
on the display in all modes.
About the Auto Light Switch
While the auto light switch is enabled, illumination turns on for about one second or
three seconds, whenever you position your wrist as described below in any mode.
Note that this watch features a “Full Auto Light,” so the auto light switch operates only
when available light is below a certain level. Illumination does not turn on under bright
light.
• Be sure to wear the watch on the outside of your wrist while using the auto light
switch.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you more than 40 degrees causes illumination to turn on.
Warning!
• Always make sure you are in a safe place whenever you are reading the watch
using the auto light switch. Be especially careful when running or engaged in
any other activity that can result in accident or injury. Also take care that
sudden illumination by the auto light switch does not surprise or distract
others around you.
• When you are wearing the watch, make sure that its auto light switch is turned
off before riding on a bicycle or operating a motorcycle or any other motor
vehicle. Sudden and unintended operation of the auto light switch can create
a distraction, which can result in a traffic accident and serious personal injury.
To turn the auto light switch on and off
In the Timekeeping Mode, hold down L for about two seconds to toggle the auto light
switch on (
• The auto light switch is automatically turned off whenever battery power is at Level
3. After battery power recovers to Level 2, you will have to perform the above
procedure to turn the auto light switch back on again.
• The auto light switch indicator (
light switch is turned on.
displayed) or off ( not displayed).
information.
Parallel to ground More than 40
) is on the display in all modes while the auto
°
2
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