Casio 3721 Operation Manual Download Page 4

Operation Guide 3721

4

5.

Press the 

A

A

A

A

A

 button 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.

6.

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.

12 o’clock

Correct Alignment

12 o’clock

12 o’clock

3.

Check the position of the
second hand.

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

If the second hand is pointing at 12 o’clock, advance to step 5.

If the second hand home position is off

4.

Press the 

B

B

B

B

B

 button to

move the second hand
clockwise, until it points at
12 o’clock.

Each press of the 

B

 button

advances the second hand by
one second.

Holding down the 

B

 button

for about two seconds
advances the second hand at
high speed. High-speed
movement of the second hand
will continue until it completes
a full revolution, or until you
press any button to stop it.

Use the following procedure to adjust the home positions of
the hands and the date when the time setting is wrong, even
after the time calibration signal is received normally.

1.

In the Timekeeping Mode,
press the 

B

B

B

B

B

 button three

times to enter the Home
Position Adjustment
Mode.

2.

To adjust the second hand
home position, hold down
the 

A

A

A

A

A

 button until the

second hand performs a
full rotation and stops
(about five seconds).

The analog hands do not
move during home position
adjustment.

Correct Alignment

12 o’clock

12 o’clock

12 o’clock

Adjusting the Home Positions

If 

 appears for the date, advance to step 13.

If 

 does not appear for the date

12.

Perform the following
steps to adjust the date
home position.

Hold down the 

B

 button for

about two seconds to start
automatic high-speed
scrolling of the date. The 
is located between 31 and 1.
When the date gets close to
31, press the 

B

 button again

to stop the scrolling. Press the

B

 button to advance the date

until 

 appears.

13.

Press the 

A

A

A

A

A

 button 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.

If the hour and minute hands are pointing at 12 o’clock,
advance to step 10.

If the hour and minute hand home position is off

9.

Use the following steps to
move the hands
counterclockwise.

Press the 

B

 button to align

the hour and minute hands
with 12 o’clock.

Each press of the 

B

 button

moves the hand setting 10
seconds.

Holding down the 

B

 button

for about two seconds moves
the hands at high speed.
High-speed movement of the
hands will continue until it
completes a 12-hour cycle, or
until you press any button to
stop it.

Move the hands at high speed until just before the setting you
want. Stop high-speed movement, and then press the 

B

button to move in 10-second increments to move the hands to
12 o’clock.

10.

Press the 

A

A

A

A

A

 button 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.

11.

Check the date indicator.

If the date indicator shows
something other than 

, it

means that the date home
position is off.

12 o’clock

Correct Alignment

 indicator

indicator

14.

Press the 

B

B

B

B

B

 button to

return to the Timekeeping
Mode.

This causes the second hand
to move to the seconds count
of the current time, where it
starts normal movement.

The watch will return to the Timekeeping Mode automatically if you
leave it in the Home Position Adjustment Mode without performing
any button operation for two or three minutes.

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.

If the hour and minute hands are pointing at 12 o’clock
and you want to set the hands by moving them
counterclockwise, advance to step 8.

If the hour and minute hand home position is off

7.

Adjust the hour and
minute hand home
position.

Use the following steps to move
the hands clockwise.

Press the 

B

 button to align

the hour and minute hands
with 12 o’clock.

Each press of the 

B

 button

moves the hand setting
10 seconds.

Holding down the 

B

 button for about two seconds moves the

hands at high speed. High-speed movement of the hands will
continue until it completes a 12-hour cycle, or until you press
any button to stop it.

Move the hands at high speed until just before the setting you
want. Stop high-speed movement, and then press the 

B

button to move in 10-second increments to move the hands to
12 o’clock.

8.

To move the hands
counterclockwise, press
the 

A

A

A

A

A

 button.

This will cause the minute
hand to move
counterclockwise about one
or two minutes, and then stop
around 12 o’clock.

Summary of Contents for 3721

Page 1: ...n an Overcast Day 5 000 lux Indoor Fluorescent Lighting 500 lux Approximate Exposure Time Timekeeping Restored Full Charge 1 hour 2 hours 3 hours 30 hours 12 hours 61 hours Note that the above charging times are for reference only Actual charging time depends on a variety of environmental factors The power supply of this watch uses a solar cell to generate electrical power which is stored by a rec...

Page 2: ...only when it is dark The auto light switch does not illuminate the face when surrounding light is bright The auto light switch will illuminate the face for about 1 5 seconds in any mode To turn the auto light switch on and off In the Receive Result Mode hold down the A button for about three seconds to toggle the auto light switch on and off Face Illumination Location Reception is difficult and ma...

Page 3: ...keeping Mode hold down the B B B B B button for about two seconds The watch will beep and signal reception will start To interrupt reception Press any button When reception starts The second hand moves to READY The hour and minute hands continue to keep time normally During reception The second hand moves to WORK The hour and minute hands continue to keep time normally Do not move the watch until ...

Page 4: ...hour and minute hand home position is off 9 Use the following steps to move the hands counterclockwise Press the B button to align the hour and minute hands with 12 o clock Each press of the B button moves the hand setting 10 seconds Holding down the B button for about two seconds moves the hands at high speed High speed movement of the hands will continue until it completes a 12 hour cycle or unt...

Page 5: ...second movement of the second hand automatically After that you can try performing the manual setting procedure again from the beginning To manually reset the second hand to the top of the minute 1 In the Timekeeping Mode hold down the A A A A A button for about five seconds until the second hand stops at AM or PM If you do not perform any button operation for about two or three minutes the watch ...

Page 6: ...l cause the second hand to stop moving whenever the watch is left in the dark Note that hand movement may stop if the watch is blocked from light by your sleeve Power Saving How the sleep state works Sleep Level 1 The second hand stops whenever the watch is left in the dark for about one hour between the hours of 10 00 p m and 6 00 a m The hour and minute hand and the date continue to operate norm...

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