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Operation Guide 3723 3724

1

MO0503-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.

Keep the watch exposed to bright light

The electricity generated by the solar cell of the watch is
stored by a built-in battery. Leaving or using the watch
where it is not exposed to light causes the battery to run
down. Make sure the watch is exposed to light as much as
possible.

When you are not wearing the watch on your wrist,
position the face so it is pointed at a source of bright
light.

You should try to keep the watch outside of your sleeve
as much as possible. Even if the face of the watch is
only partially blocked from light, charging will be reduced
significantly.

ll

l

l

l

l

l

l

l

l

l

Bright light

Solar cell

The watch continues to operate, even when it is not exposed to light. Leaving the
watch in the dark can cause the battery to run down, which will cause some watch
functions to be disabled. If the battery goes dead, you will have to re-configure watch
settings after recharging. To ensure normal watch operation, be sure to keep it
exposed to light as much as possible.

Bright light

Electrical 
energy

All 
functions
enabled

LEVEL 1

LEVEL 2

LEVEL 3

Charge

Solar cell
(Converts light to 
electrical power.)

Rechargeable battery

LEVEL 1

LEVEL 2

LEVEL 3

Some 
functions 
disabled

Dis-

charge

Battery charges in the light.

Battery discharges in the dark.

The actual level at which some functions are disabled depends on the watch model.

Frequent display illumination can run down the battery quickly and require charging.
The following guidelines give an idea of the charging time required to recover from a
single illumination operation.

Approximately 5 minutes exposure to bright sunlight coming in through a window
Approximately 50 minutes exposure to indoor fluorescent lighting

Be sure to read “Power Supply” for important information you need to know
when exposing the watch to bright light.

If the analog hands aren’t moving...

If the analog hands aren’t moving, it means that the power saving mode has stopped
them to save battery power.

See “Power Saving” for more information.

About This  Manual

Button operations are indicated using the letters shown
in the illustration.

Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.

Hour hand

Minute hand

Date

Second hand

General Guide

Press 

B

 to change from mode to mode.

In the Timekeeping Mode, press 

A

 to illuminate the face of the watch.

Press 

B

.

Timekeeping Mode

Receive Result Mode

Home Position

Adjustment Mode

Alarm Mode

Radio-controlled Timekeeping

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 in Germany
(Mainflingen) and England (Rugby).

Current Time  Setting

This watch adjusts its time setting automatically 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 specify your Home
Time Zone, which is the time zone where you will normally use the watch. For more
information, see “To specify your Home Time Zone” below.

When using the watch outside the range of the Germany and England time signal
transmitters, you have to adjust the current time setting manually as required. See
“Timekeeping” for more information about manual time settings.

To specify your Home Time Zone

1. In the Timekeeping Mode, hold down 

A

 for about five

seconds until the second hand moves to the currently
selected GMT differential value and stops. This is the
setting mode.

The GMT differential value indicates the time
difference in hours between Greenwich Mean Time
and the currently selected time zone.

2. Press 

B

 to select the time zone you want to use as

your Home Time Zone.

GMT+ 0 (12 o’clock): London
GMT+ 1 (1 o’clock): Paris, Berlin, Milan, Rome,

Amsterdam, Hamburg, Frankfurt, Vienna,
Barcelona, Madrid

3. Press 

A

 eight times to exit the setting mode.

The watch will also return to the Timekeeping Mode if
you do not perform any operation for about two or three
minutes.

GMT differential
value (+0)

GMT differential
value (+1)

Normally, your watch should show the correct time as soon as you specify your
Home Time Zone. If it does not, it should adjust automatically after the next auto
receive operation (in the middle of the night). You can also perform manual receive
or you can set the time manually.

Even if the time calibration signal is received correctly, there are some times when
the analog hands may not indicate the correct time. If this happens, use the
procedures under “Adjusting the Home Positions” to check the home positions of the
hands, and make adjustments as required.

The watch will receive the time calibration signal automatically from the applicable
transmitter (in the middle of the night) and update its settings accordingly. For
information about the relationship between time zones (GMT differential values) and
transmitters, see “Transmitters”.

See the maps under “Reception Ranges” for information about the reception ranges
of the watch.

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 receives the time calibration signal automatically up to six
times a day. When any auto receive is successful, the remaining auto receive
operations are not performed. For more information, see “About Auto Receive”.

Manual Receive

Manual receive lets you start a time calibration receive operation 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 9 o’clock side facing towards a window.
Make sure there are no metal objects nearby.

9 o’clock

or

The watch should not be facing the wrong way.

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

When within range of the applicable transmitter, this watch can receive either the
Germany (Mainflingen) or England (Rugby) time calibration signals. See
“Transmitters” for more information.

Summary of Contents for 3723

Page 1: ...ou will normally use the watch For more information see To specify your Home Time Zone below When using the watch outside the range of the Germany and England time signal transmitters you have to adjust the current time setting manually as required See Timekeeping for more information about manual time settings To specify your Home Time Zone 1 In the Timekeeping Mode hold down A for about five sec...

Page 2: ... If you adjust the time or date setting manually the second hand will move to N N No Y Yes 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 mid...

Page 3: ... your face The auto light switch must be turned on for it to operate See Illumination Precautions for other important information To illuminate the face of the watch In the Timekeeping Mode except for the setting mode press A to illuminate the face of the watch about for one second The above operation turns on illumination regardless of the current auto light switch setting About the Auto Light Sw...

Page 4: ...nal reception or if the time setting is wrong after signal reception check your Home Time Zone GMT differential setting The following are the initial factory defaults for this setting Module 3723 GMT 1 0 Module 3724 GMT 0 0 To find out the module number of your watch look at its back cover The Module number 3723 or 3724 is engraved inside the box on the back cover Transmitters This watch is able t...

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