Casio 3725 Operation Manual

MO0405-EA
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully and keep it on hand for later reference
when necessary.
Expose the watch to bright light to charge its batteries before using it.
You can use this watch even as its batteries are being charged by exposure to
bright light.
• Be sure to read "Power Supply" of this manual for important information you
need to know when exposing the watch to bright light.
If the digital display of the watch is blank...
Power saving indicator
General Guide
• Press C to change from mode to mode.
• In any mode, press L to illuminate the digital display areas.
Timekeeping Mode
Radio-controlled Timekeeping
Hour hand
Minute hand
Day of week
Seconds
Current Time Setting
This watch automatically adjusts its time setting in accordance with a time calibration
signal. You can also perform a manual procedure to set the time and date, when
necessary.
• The first thing you should do after purchasing this watch is to set your Home City,
which is the city where you will normally use the watch. For more information, see
"To set your Home City" below.
• When using the watch in an area that is outside of the range of the transmitters in
Rugby and Mainflingen, you need to manually adjust the time as required. See
"Timekeeping" for information about manual settings.
• The analog time of this watch is synchronized with the digital time. Because of this,
the analog time setting is automatically adjusted whenever you change the digital
setting. See "Analog Timekeeping" for more information.
To set your Home City
City code
3. Press A to exit the setting screen.
• Normally, your watch should show the correct time as soon as you select your Home
City Code. If it does not, it should adjust automatically after the next auto receive (in
the middle of the night). You can also perform manual receive or you can set the time
manually.
• If you are in an area that does not use Daylight Saving Time (summer time), turn off
the DST setting.
Operation Guide 3725 3726
If the Power Saving indicator ( ) is flashing, it means
that the display is blank because the watch's Power
Saving function has turned it off to conserve power. Power
Saving automatically turns off the display and enters a
sleep state whenever your watch is left for a certain period
in an area where it is dark. If the watch is kept in the dark
for a longer period, the analog hands will also stop moving
after a few days.
• The initial factory default setting is Power Saving on.
• The watch will recover from the sleep state if you move it
to a well-lit area, if you press any button, or if you angle
the watch towards your face for reading.
• See "Power Saving Function" for more information.
World Time Mode
Press C.
P
This watch receives a time calibration signal and updates
its time setting accordingly. The time calibration signal
includes both Standard Time and Daylight Saving Time
(summer time) data.
• This watch is designed to pick up the time calibration
signal transmitted from Rugby, England and the signal
from Mainflingen, Germany.
1. In the Timekeeping Mode, hold down A until the city
code starts to flash in the bottom dial, which indicates
the setting screen.
2. Use D (east) and B (west) to scroll through the city
codes until the one you want to use as your Home City
is displayed.
• The following are the city codes for major cities in the
Western Europe time zones.
LON : London
PAR and BER : Paris, Berlin, Milan, Rome,
Amsterdam, Hamburg, Frankfurt,
Vienna, Barcelona, Madrid
About This Manual
• Depending on the model of your watch, display text
appears either as dark figures on a light background, or
light figures on a dark background. All sample displays
in this manual are shown using dark figures on a light
background.
• Button operations are indicated using the letters shown
in the illustration.
• Each section of this manual provides you with the
(Light)
information you need to perform operations in each
mode. Further details and technical information can be
found in the "Reference" section.
(Light)
Alarm Mode
Hand Setting Mode
To display the digital time and last signal screen
• In the Timekeeping Mode, press B to cycle through the digital time screens as
shown below.
• In the Timekeeping Mode, press D to display the last signal screen in the bottom
dial. The last signal screen shows the date and time of the last successful time
calibration signal reception.
Day
Press B.
Day of week
Press D.
Day of
Seconds
week
Last Signal
DST indicator
Screen
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
• Auto Receive
With auto receive, the watch automatically picks up the time calibration signal five
times a day at midnight, 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. For more
information, see "About Auto Receive".
• Manual Receive
Manual receive lets you start a time calibration signal reception with the press of a
button. For more information, see "To perform manual receive".
Important!
• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o'clock side facing towards a window.
Make sure there are no metal objects nearby.
Resin Band Metal Band
• The watch should not be on its side or facing the wrong way.
• Proper signal reception can be difficult or even impossible under the conditions listed
below.
Inside or Inside a Near
among vehicle household
buildings appliances,
office
equipment,
or a mobile
phone
Countdown Timer Mode
Stopwatch Mode
Hour:
Seconds Seconds
Minutes
B B
PM indicator
Month. Day
B
Reception time
Reception date
Near a Near high- Among or
construction tension behind
site, airport, or power lines mountains
other sources
of electrical
noise
1