Casio 3722 Operation Manual Download Page 2

Operation Guide 3722

2

Proper signal reception can be difficult or even impossible under the conditions listed
below.

Signal reception is normally better at night than during the day.

Time calibration signal reception takes from four 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 during this time.

Inside or
among
buildings

Inside a
vehicle

Near a
construction
site, airport, or
other sources
of electrical
noise

Near high-
tension
power lines

Among or
behind
mountains

Near
household
appliances,
office
equipment,
or a mobile
phone

Under good reception conditions, signal reception is possible within a radius of
about 2,000 miles (3,000 kilometers) from the Fort Collins transmitter.

At distances further than about 600 miles (1,000 kilometers) from the Fort Collins
transmitter, signal reception may not be possible during certain times of year or
times of day. Radio interferance may also cause problems with reception.

See the information under “Signal Reception Troubleshooting” if you experience
problems with time calibration signal reception.

Reception Ranges

2,000 miles

Fort Collins

600 miles

About Auto Receive

The watch automatically starts to receive the time calibration signal when the time in
the Timekeeping Mode reaches 0:01 a.m., 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. When any auto receive is successful, the remaining auto receive
operations are not performed.  The reception schedule (calibration times) depends on
your currently selected Home Time Zone, and whether standard time or Daylight
Saving Time is selected for your Home Time Zone.

Note

The auto receive operation is performed only if the watch is in the Timekeeping
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.

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 receive the signal easily.

The watch receives the calibration signal for four to seven minutes everyday when
the time in the Timekeeping Mode reaches each of the calibration times. Do not
perform any button operation within seven minutes before or after any one of the
calibration times. Doing so can interfere with correct calibration.

Remember that reception of the calibration signal depends on the current time in the
Timekeeping Mode. The receive operation will be performed whenever the display
shows any one of the calibration times, regardless of whether or not the displayed
time is actually the correct time.

To perform manual receive

1. Place the watch on a stable surface so its 9 o’clock side

is facing towards a window.

2. In any mode, hold down 

B

 for about two seconds until

the watch beeps.

3. When you release 

B

, the second hand will move to

READY

 to indicate that the watch is setting up for time

calibration reception.

The second hand will move to 

WORK

 and stay there

while actual reception is in progress.

The hour and minute hands continue to keep time
normally.

Time calibration signal reception takes from four to
seven minutes, but in some cases it can take up to 14
minutes. Take care that you do not perform any button
operations or move the watch during this time.

If reception is successful, the second hand will move to

YES

. One or two minutes later, the hands will move to

the correct time.

WORK

READY

Note

To interrupt a receive operation and return to the Timekeeping Mode, press any
button.

If reception is not successful, the second hand will move to 

NO

. One or two minutes

later, the second hand will resume normal operation, without any adjustment of the
hand setting.

If the second hand is pointing to 

YES

 or 

NO

, you can return to the Timekeeping

Mode by pressing any button.

To check the latest signal reception results

Enter the Receive Result Mode.

If the watch was able to perform a successful signal
receive operation since midnight, the second hand will
move to 

YES

. If the watch has been unable to receive

any signal successfully, the second hand will move to

NO

.

To return to the Timekeeping Mode, press 

B

 three

times.

The current receive result is cleared when the first auto
receive operation is performed on the following day. This
means 

YES

 indicates successful signal reception since

the start of the current day.

YES

 continues to be indicated even if an attempt at

manual receive fails after auto receive is successful.

If you adjust the time or date setting manually, the
second hand will move to 

NO

.

Signal Reception Troubleshooting

Check the following points whenever you experience problems with signal reception.

You changed the time setting
manually.

The watch was not in the
Timekeeping Mode, or you performed
some button operation during the
auto receive operation.

Signal reception results are reset at
midnight each day.

The Home Time Zone setting is not
correct for the area where you are
using the watch.

The second
hand is
pointing at

NO

.

Time setting is
incorrect
following signal
reception.

Perform manual signal
receive or wait until the next
auto signal receive operation
is performed.

Check to make sure the
watch is in a location where it
can receive the signal.

Select the correct Home
Time Zone.

What you should do

Problem

Probable Cause

For further information, see “Important!” under “Time Calibration Signal Reception”
and “Radio-controlled Atomic Timekeeping Precautions”.

Alarm

When the alarm is turned on, the alarm sounds when the
alarm time is reached.

All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing 

B

.

When you enter the Alarm Mode, the second hand will
move to either 

ON

 (alarm on) or 

OFF

 (alarm off), and

the hands will move to the current alarm time setting.

To set an alarm time

1. In the Alarm Mode, hold down 

A

 for five seconds to

display the setting mode.

The second hand will move to 

AM

 or 

PM

.

2. Use 

A

 and 

B

 to change the alarm time.

Press 

B

 to move the hands clockwise in one-minute

steps.

To move the hands back, press 

A

. After that, each press of 

B

 will move the

hands counterclockwise in one-minute steps.

Once you use the above operation to change to counterclockwise hand
movement, pressing 

A

 will not change back to clockwise hand movement.

Pressing 

A

 during counterclockwise hand movement will exit the setting mode.

To use clockwise hand movement again, you will need to exit the setting mode
and restart this procedure from step 1.

When setting the alarm time, take care to set AM and PM correctly. The second
hand will move between 

AM

 and 

PM

 any time the hour hand moves past 12

o’clock while you are setting the alarm time.

3. After setting the alarm time, press 

A

 as many time as necessary to exit the setting

mode.

If you set the alarm time using clockwise hand movement only, press 

A

 twice to exit

the setting mode.

If you set the alarm time using counterclockwise hand movement, press 

A

 once to

exit the setting mode.

This will cause the hour and minute hands to move to the current time, and the
second hand to move to 

ON

 (alarm on).

Setting the alarm time causes the alarm to turn on automatically.

Alarm Operation

The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in.

Alarm operations are performed in accordance with the Timekeeping Mode time.

Pressing any button stops the alarm tone operation.

To turn an alarm on and off

In the Alarm Mode, press 

A

 to toggle the alarm 

ON

 and 

OFF

.

Viewing the Latest Signal Reception Results

You can use the Receive Result Mode to check if signal reception was performed
correctly.

Summary of Contents for 3722

Page 1: ...th Standard Time and Daylight Saving Time summer time data This watch is designed to pick up the time calibration signal transmitted in the United States Fort Collins Colorado 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 Current Time Sett...

Page 2: ...utton If reception is not successful the second hand will move to NO One or two minutes later the second hand will resume normal operation without any adjustment of the hand setting If the second hand is pointing to YES or NO you can return to the Timekeeping Mode by pressing any button To check the latest signal reception results Enter the Receive Result Mode If the watch was able to perform a su...

Page 3: ...r the setting mode from step 1 When setting the day the watch automatically will skip days 30 and 31 that are not included in the currently selected month If you can t select 30 or 31 when you want to check to make sure that the proper month is selected 4 After setting the 1 s digit of the year press A to exit the setting mode This will cause the hands to move to the current time and resume normal...

Page 4: ...me of day may change the reception range of the signal and make reception temporarily impossible Even if the time calibration signal is received properly certain conditions can cause the time setting to be off by up to one second The current time setting in accordance with the time calibration signal takes priority over any time settings you make manually The watch is designed to update the date a...

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