Casio 3721 Operation Manual Download Page 6

Operation Guide 3721

6

7.

Press the 

B

B

B

B

B

 button to

increase the ten’s digit
setting by one.

You can set the year within
the range of 2000 to 2099.

8.

Press the 

A

A

A

A

A

 button.

The second hand will move to
the one’s digit of the year
setting.

1

2

3

9

8

7

4

6

5

0

9.

Press the 

B

B

B

B

B

 button to

increase the one’s digit
setting by one.

10.

Press the 

A

A

A

A

A

 button to

return to the Timekeeping
Mode.

This will cause the hands to
move to the current time, and
resume normal movement.

The watch automatically makes adjustments for leap years and
month lengths. The date will change automatically when the
current time reaches midnight. The date change at the end of the
month may take more time than normal.

Year (one's digit)

Power Saving puts the watch into a sleep state, which will 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
normally.

The alarm operates normally.

Sleep Level 2
If the watch is left in the dark for an additional six or seven days,
the hour and minute hands, and the date indicator also stop.

Auto time calibration is not performed.

The alarm does not sound.

Timekeeping continues internally even when the hands are
stopped.

To recover from the sleep state

Move the watch to a brightly lit location, press any button, or raise
the watch to your eyes for viewing (see “To illuminate the face with
the auto light switch”). The hands will move to the current time
setting and resume timekeeping from there.

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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