World Time - Casio 3725 Operation Manual

Operation Guide 3725 3726
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to seven minutes, but in some cases
it can take as long as 14 minutes. Take care that you do not perform any button
operations or move the watch while time calibration signal reception is in progress.
1,500 kilometers
Rugby
500 kilometers
• This watch is designed to receive the time calibration signal transmitted from Rugby,
England and the signal from Mainflingen, Germany. Signal reception is possible
within the area represented by a circle with a radius of about 1,500 kilometers.
• At distances further than about 500 kilometers from a transmitter, signal reception
may not be possible during certain times of year or times of day. Radio interference
may also cause problems with reception.
• See the information under "Signal Reception Troubleshooting" if you experience
problems with time calibration signal reception.
About Auto Receive
When auto receive is turned on, the watch automatically starts to receive the time
calibration signal when the time in the Timekeeping Mode reaches midnight, 1:00
a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. each day (calibration times). The watch will
also perform an additional auto receive at 5:00 a.m. if none of the regularly scheduled
auto receive operations are successful.
Note
• Auto receive is performed only if the watch is in the Timekeeping Mode or World
Time Mode when one of the calibration times is reached. It is not performed if a
calibration time is reached while an alarm is sounding, or while you are configuring
settings (while a setting is flashing).
• Auto receipt of the calibration signal is designed to be performed early in the
morning, while you sleep (provided that the Timekeeping Mode time is set correctly).
Before going to bed for the night, remove the watch from your wrist, and put it in a
location where it can easily receive the signal.
• When auto receive is turned on, the watch receives the calibration signal for two to
seven minutes everyday when the time in the Timekeeping Mode reaches each of
the five calibration times. Do not perform any button operation within seven minutes
before or after any of the five calibration times. Doing so can interfere with correct
calibration.
• Remember that reception of the calibration signal depends on the digital time kept
by the Timekeeping Mode. Reception will be performed whenever the Timekeeping
Mode time reaches one of the five calibration times, regardless of whether or not the
Timekeeping Mode time is actually the correct time.
• When two, three, four, or five receptions are successful, the watch uses the data of
the last reception for calibration. When only one reception is successful, the watch
uses the data of the successful reception.
About the Receiving Indicator
The receiving indicator shows the strength of the calibration signal being received. For
best reception, be sure to keep the watch in a location where signal strength is
strongest.
Receiving indicator
Weak
(Level 0)
• Even in an area where signal strength is strong, it takes about 10 seconds for signal
reception to stabilize enough for the receiving indicator to indicate signal strength.
• Use the receiving indicator as a guide for checking signal strength and for finding the
best location for the watch during signal reception.
• The Level 3 receiving indicator remains displayed in all modes following reception of
the time calibration signal and calibration of the watch's time setting. The Level 3
receiving indicator is not displayed if signal reception was unsuccessful or after
manual adjustment of the current time setting.
• The Level 3 receiving indicator indicates that at least one of the five calibration
signal receive operations was successful. Note, however, that the Level 3 receiving
indicator is cleared at 3:00 a.m. each day.
To perform manual receive
1. Place the watch on a stable surface so its top (12
Receiving indicator
o'clock side) is facing towards a window.
2. In the Timekeeping Mode, hold down D for about two
seconds until the watch beeps.
3. After you release D, the bottom dial will alternate
between the current time and date, and the letters
RC! . This indicates that signal reception is in
progress.
• Time calibration signal reception normally takes from two to seven minutes, but in
some cases it can take as long as 14 minutes. Take care that you do not perform any
button operations or move the watch while time calibration signal reception is in
progress.
• After signal reception is complete, the bottom dial changes to the last signal screen.
Note
• To interrupt a reception and return to the Timekeeping Mode, press D.
• If reception is unsuccessful, the message
one or two minutes. After that, the watch returns to the Timekeeping Mode.
• You can also clear the
message by pressing D.
ERR
Mainflingen
Strong
(Level 3)
ERR appears in the bottom dial for about
Configuring Auto Receive Settings
You can use the procedure in this section to configure the watch to receive the signal
of a specific transmitter, or to automatically receive from the transmitter whose signal
is strongest. You can also turn off auto receive, if you want.
• Note that you can perform the following procedure only when
is selected as your Home City.
To configure auto receive settings
1. In the Timekeeping Mode, press D to display the last
signal screen in the bottom dial.
• The watch will automatically return to the Timekeeping
Mode if you do not perform any button operation for two
or three minutes after displaying the last signal screen.
2. Hold down A until the current auto receive setting
flashes in the bottom dial. This is the setting screen.
• If the auto receive setting does not appear when you
hold down A, it means that the city code currently
selected for the Home City is for an area that does not
support calibration signal reception. You cannot turn
Setting status
auto receive on or off in this case.
3. Use D to cycle through the settings shown below, until the one you want to use is
displayed in the bottom dial.
DCF
AvtA : Auto receive on. The watch automatically selects the transmitter whose
signal is strongest. Signal reception can take up to 14 minutes when this
option is selected.
DCF : Auto receive on for reception of the Mainflingen signal.
MSF : Auto receive on for reception of the Rugby signal.
OFF : Auto receive off.
• For details about transmitters, see "Transmitters".
4. Press A to exit the setting screen.
• To return to the Timekeeping Mode from the last signal screen, press D.
• For information about city codes that support signal reception, see "To set your
Home City".
Note
• Manual receive operations are also performed based on the transmitter setting
( AvtA , DCF , MSF ) you select above.
• If auto receive is turned off, performing a manual receive operation automatically
receives the signal that is strongest.
Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal reception.
Problem Probable Cause
• The watch is not in the Timekeeping
Cannot perform
manual receive. Mode.
• Your current Home City is not one of the
following city codes: BER ,
LON.
• You changed the time setting manually.
Auto receive is
• The watch was not in the Timekeeping
turned on, but
the Level 3 or World Time Mode, or you were
receiving performing some button operation
indicator does during the auto receive.
• Even if reception is successful, the
not appear.
Level 3 receiving indicator disappears
every day at 3 a.m.
• Time data (hour, minutes, seconds) only
was received during the last reception.
The Level 3 receiving indicator appears
only when time data and date data
(year, month, day) are both received.
• If the time is one hour off, the DST
Time setting is
incorrect setting may be incorrect.
• The Home City code setting is not
following signal
reception. correct for the area where you are using
the watch.
• For further information, see "Important!" under "Time Calibration Signal Reception"
and "Radio-controlled Timekeeping Precautions".

World Time

The World Time Mode digitally shows the current time in
Mode indicator
30 cities (29 time zones) around the world.
• Pressing A in the World Time Mode causes the
applicable city code to appear in the bottom dial for
about one second.
• If the current time shown for a city is wrong, check your
Home City time settings and make the necessary
changes.
P
• The watch will perform a signal reception even if it is in
the World Time Mode when a calibration time is
reached. If this happens, the World Time Mode time
Current
settings will be adjusted in accordance with the
time in
selected Timekeeping Mode's Home City time.
City code • All of the operations in this section are performed in the
city
World Time Mode, which you enter by pressing C.
To view the time in another city
While in the World Time Mode, press D to scroll through the city codes (time zones)
to the east or B to scroll to the west.
• For full information on city codes, see the "City Code Table".
LON , BER , or PAR
OFF
What you should do
• Enter the Timekeeping Mode
and try again.
• Select
BER , PAR , or LON
PAR , or as your Home City.
• Select the appropriate
transmitter setting for your
current location.
• Perform manual receive or
wait until the next auto signal
receive is performed.
• Check to make sure the
watch is in a location where it
can receive the signal.
• Change the DST setting to
Auto DST.
• Select the correct Home City
code.
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