Casio 4316 Operation Manual Download Page 2

Operation Guide 4316

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 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 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 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.

Viewing the Latest Signal Reception Results

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

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”.

Adjusting the Home Positions

If the time and date settings are wrong even after the time calibration signal is
received normally, use the following procedure to adjust their home positions.

To adjust the home positions

1. Enter the Home Position Adjustment Mode.

If the home position of the second hand is currently
correct, it will move to the 12 o’clock position.

2. While in the Home Position Adjustment Mode, hold

down 

A

 for about five seconds. This will cause the

second hand to make one revolution and stop at its
current home position.

The analog hands do not keep time during home
position adjustment.

3. Check the position of the second hand.

The second hand home position is correct if it is
pointing at 12 o’clock.

12 o’clock

Correct second hand
home position

If the second hand is not pointing at 12 o’clock, it
means that its home position is off. If this happens,
press 

B

 to move the second hand clockwise in one-

second steps, until it points at 12 o’clock.

4. Press 

A

 to advance to hour and minute hand home

position adjustment.

If current hour and minute hand alignment is correct,
they will both move to 12 o’clock.

5. Check the position of the hour and minute hands.

If the hour and minute hands are not pointing at 12
o’clock, it means that their home position is off. If this
happens, press 

B

 to move the hour and minute

hands clockwise in 10-second steps, until they point
at 12 o’clock.

You can change the hour and minute hand movement
direction to counterclockwise by pressing 

A

. After

that, each press of 

B

 will move the hour and minute

hands counterclockwise in 10-second steps.

Correct hour
and minute hand
home position

12 o’clock

6. Press 

A

 to advance to date home position adjustment.

The date indicator will show 

 if the date home

position is correct. Note that it can take up to 90
seconds before 

 appears.

7. Check the date indicator.
8. If the date indicator shows something other than 

, it

means that the date home position is off. If this
happens, press 

B

 to advance the date until 

appears.

 is located between 31 and 1.

9. Press 

A

 to exit home position adjustment.

This causes the date to change to the current date, and
the hour and minute hands to move to the current time.

Note that all button operations are disabled while the
date is changing, and the hour and minute hands are
moving.

To return to the Timekeeping Mode, press 

B

.

 indicator

Correct date home
position

After you complete the home position adjustment procedure, place the watch in a
location that allows good time calibration signal reception, and then perform a
manual receive operation. See “To perform manual receive” for more information.

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