Casio 4378 Operation Manual Download Page 1

Operation Guide 4378 4379

1

MO0603-EA

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.

General Guide

Press 

C

 to change from mode to mode.

In any mode, press 

B

 to illuminate the display.

Alarm Mode

Stopwatch Mode

Timekeeping Mode

Press 

C

.

World Time  Mode

Hand Setting 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 from Rugby, England and the signal
from Mainflingen, Germany.

Day

Day of week

Minute hand

Hour hand

Second hand

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

1. In the Timekeeping Mode, hold down 

A

 until the city

code starts to flash, which indicates the setting screen.

The second hand will move at high speed to the 12
o’clock position, where it will stop.

2. Use 

D

 (east) and 

B

 (west) to select the city code you

want to use as your Home City.

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

ATH

: Athens

3. Press 

A

 to exit the setting screen.

The second hand will advance at high speed to the
correct position in accordance with seconds count of the
digital time, and resume normal movement from there.

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City code

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.

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 city codes and transmitters, see
“Transmitters”.

To display the digital time and last signal screen

In the Timekeeping Mode, press 

A

 to cycle through the digital time screens as

shown below.

In the Timekeeping Mode, press 

D

 to display the last signal screen. The last signal

screen shows the date and time of the last successful time calibration signal
reception.

Last Signal Screen

Reception date

Day of week

Press 

A

.

Day

Receiving indicator

A

2 seconds

2 seconds

2 seconds

A

Press 

D

.

Hour :
Minutes

Reception Time

PM indicator

Date Screen

Receiving
Indicator and
Seconds Count

Current Time
Screen

Seconds

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 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
among
buildings

Inside a
vehicle

Near
household
appliances,
office
equipment,
or a mobile
phone

Near a
construction
site, airport, or
other sources
of electrical
noise

Near high-
tension
power lines

Among or
behind
mountains

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