Casio 3390 User Manual
MA0406-EA
Modes and Display Screens
Operation Guide 3390
Each press of the
• The display will automatically revert to the Timekeeping screen if you leave the Alarm or Hand Setting screen displayed without performing
any operation for about two or three minutes.
CC
C button sounds a confirmation tone and cycles through available modes in the sequence shown below.
CC
Timekeeping Mode
Changing Display Screen Contents
Each press of the button cycles display contents in the
Button Button
(Light)(Screen Switching)
Button Button
(Mode switching)
Days of the Week
SUN: Sunday MON: Monday TUE: Tuesday
WED: Wednesday THU: Thursday FRI: Friday
SAT: Saturday
following sequence: Calendar Screen \ Seconds Screen \
Current Time Screen.
Month.Day
PM indicator
(no indicator for AM)
Hour
Calendar Screen
Day of the Week
2-second interval
Seconds ScreenCurrent Time Screen
Seconds
Minutes
How a Radio-controlled Watch Works
What is a radio-controlled watch?
Your radio-controlled watch is designed to receive a time
calibration signal that contains standard time data, and adjust its
current time setting accordingly.
Long-
Watch
wave time
calibration
signal
Signal data
Time data
Internally
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.
Signal is received
using built-in antenna.
Watch decodes
received data
and converts it
to time data.
Decode
Time is adjusted
according to time
data.
Calibration Signal
• The Japanese calibration signal (Call Sign: JJY) is maintained by
the National Institute of Information and Communications
Technology (NICT). It is a long wave signal transmitted 24 hours a
day from the Mt. Otakadoya transmitter (40kHz) located in
Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane
transmitter (60kHz) 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.
Note that transmission of the standard wave may be
interrupted occasionally due to maintenance, lightening, etc.
World Time Mode Alarm Mode
City Code
Current Time
in Selected City
Alarm
• Alarm off
Hourly Time Signal
• Hourly Time Signal off
Hand Setting Mode Stopwatch Mode
Mode Indicator
Mode
Indicator
Elapsed Time
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 Time setting.
• For information about selecting a Home City, see “Configuring Home Time Settings”. For information about city codes, see the “World Time
City Code List”.
Home City
TYO
LAX, DEN, CHI, NYC
Japan Transmitter
Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz)
Fort Collins, Colorado signal
1000km
Locations
Mt. Hagane
(60kHz)
• Under optimum conditions, the calibration signal should be
receivable up to 1,000 kilometers from the transmitter. Note
that the wave is relatively weak at distances greater than
500km, so reception may be poor at long distances.
500km
1000km
500km
Mt. Otakadoya
(40kHz)
U.S. Transmitter
Location
• Under optimum conditions, the calibration signal should be
Transmitter
3000km
1000km
Fort Collins
receivable up to 3,000 kilometers from the transmitter. Note
that the wave is relatively weak at distances greater than
1,000km, so reception may be poor at long distances.
• Geographic contours, nearby buildings, seasonal conditions, the time of day, can even make reception impossible even when you are within
range of the transmitter.
• Best reception is possible late at night.
1
Location
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 operating like a radio or TV when it
is receiving the calibration signal.
Among or near buildings
Inside a vehicle
(automobile, train, plane, etc.)
In a location where there is
radio interference
(construction site, airport, etc.)
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.
Near high-voltage lines
Next to a household appliance
or office equipment (TV, speaker,
fax, computer, cell phone, etc.)
Near mountains
Operation Guide 3390
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration signal.
• Auto receive (Reception is performed automatically at
midnight, 2:00, 3:00 and 4:00 each morning.)
•
Manual receive (You initiate reception using a button operation.)
• If reception is not successful for any of the normal auto receive
operations shown above, auto receive is performed one more
time at 5:00 a.m.
• The watch is set up for auto receive at the factory, so all you need to
do is to place it in a location that allows good reception each night.
❚
To position the watch for optimum 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.
Resin band
Metal band
• Orienting the watch so it is sideways to the transmitter makes it
more difficult to receive the signal.
• Do not move the watch while it is receiving the calibration signal.
❚
Time Required for Reception
A calibration signal receive operation takes anywhere from about
two to six minutes.
• Note that when “AUTO” (Auto Select) is specified as the
transmitter selection mode, signal reception can take up to
12 minutes.
• See “Configuring Auto Receive Settings” for more information.
❚
To perform manual receive
In the Timekeeping Mode, hold
DD
down the
D button for about
DD
two seconds.
• The watch will beep and
reception will start. An indicator
will appear on the display to
indicate reception conditions.
❚
To interrupt reception
DD
Press the
D button.
DD
• All other buttons besides D are disabled during signal reception.
When reception is successful
The watch terminates reception and adjusts the current time. Next
it beeps and then displays the date and time that the adjustment
was performed.
Reception Error (ERR Indicator)
The watch does not adjust its current time setting, and displays
“ERR” when signal reception is unsuccessful for some reason.
• The watch will return to the Timekeeping Mode automatically if
you do not perform any operation for about one or two minutes.
❚
Receive Indicator
The receive indicator cycles from
“Unstable” through “Stable” as
shown below while reception is in
progress. How far it cycles depends
on the signal strength. Keep the
watch in a location where reception
is stable while reception is in
progress.
Unstable
• Even under optimum reception conditions, it can take about 10
seconds for reception to stabilize.
• Use the receive indicator to check reception status and to
determine the best location for signal reception.
• Note that weather, the time of day, surroundings, and other
factors can all affect reception.
Receive Indicator
Stable
❚
To view the last reception date and time
In the Timekeeping Mode, press the
• This causes the display to start cycling through the “ ”
screen, last reception date screen, and last reception time screen
at two-second intervals.
• To return to the Timekeeping Mode, press the D button again.
• The watch will return to the Timekeeping Mode automatically if
you do not perform any operation for about one or two minutes.
DD
D button.
DD
Last Reception
Date
Last Reception
Time
Configuring Auto Receive Settings
Use the procedure below to turn auto receive of the time
calibration signal on or off. When TYO (Tokyo) is selected as your
Home City, you can also specify the transmitter selection mode,
which controls which Japanese transmitter signal should be used
for time calibration.
• For information about selecting you Home City, see “Configuring
Home Time Settings”.
• The initial factory default settings for auto receive are Home City =
TYO (Tokyo); Auto Receive = On; Transmitter = AUTO
• The following procedure can be performed only when TYO, LAX,
DEN, CHI, or NYC is selected as the Home City.
❚
To configure auto receive settings
1. In the Timekeeping Mode,
• This will cause the display to
• The watch will return to the
2. Hold down the
• This will cause the currently
DD
press the
D button.
DD
start cycling through the last
reception date and time
screens.
Timekeeping Mode
automatically if you do not
perform any operation for
about one or two minutes.
AA
A button
for about two seconds.
auto receive setting to flash
on the display.
AA
3. Press the
4. When the setting is the
• This will exit the setting
• To return to the Timekeeping
• The watch will return to the
DD
D button to
DD
cycle through the
available auto receive
settings.
way you want, press the
AA
A button.
AA
screen and return to the last
reception date and time
screens.
Mode, press the D button
again.
Timekeeping Mode
automatically if you do not
perform any operation for
about one or two minutes.
Auto Receive Settings when the Home City is TYO
• AUTO
Auto receive turned on with automatic selection of either the
Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal
(60kHz), whichever is strongest.
• 40
Auto receive turned on for the Mt. Otakadoya signal (40kHz).
• 60
Auto receive turned on for the Mt. Hagane signal (60kHz).
• OFF
Auto receive turned off.
Auto Receive Settings when the Home City is NYC,
CHI, DEN, or LAX
• ON
Auto receive turned on for the Ft. Collins, Colorado signal.
• OFF
Auto receive turned off.
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