Casio 4378 - User Manual

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

Summary

General Guide and Modes Overview

Timekeeping Mode

Enables basic time display and mode switching.

World Time Mode

Displays current time in 30 cities (29 time zones) worldwide.

Alarm Mode

Allows setting and managing alarms and hourly time signals.

Radio-controlled Timekeeping

Displaying Digital Time and Last Signal

Cycle through digital time screens and view last signal reception.

Setting Your Home City

Select your primary city for accurate time calibration.

Time Calibration Signal Reception

Information on auto and manual reception of time signals.

About Auto Receive

Details on the automatic reception of time calibration signals.

About the Receiving Indicator

Guidance on using the indicator for signal strength.

To Perform Manual Receive

Procedure to manually initiate time calibration signal reception.

Signal Reception Troubleshooting

Common issues and solutions for signal reception problems.

World Time Features

Viewing Time in Another City

Scroll through city codes to view different time zones.

Toggling City Code Time

Switch between Standard Time and Daylight Saving Time.

Alarms and Timekeeping Operations

To Set an Alarm Time

Step-by-step guide to setting alarm times.

Alarm Operation and Testing

How alarms sound, how to test them, and turn them on/off.

Setting the Digital Time and Date Manually

Procedure for manually adjusting time and date settings.

Daylight Saving Time (DST) Settings

How to manage DST settings for Home City and other cities.

Advanced Watch Functions

Analog Timekeeping Adjustment

How to adjust analog hands to match digital time.

Transmitter Information

Details on the Rugby and Mainflingen time calibration signals.

Timekeeping Precision and Calendars

Information on time accuracy and automatic calendar functions.

Illumination Precautions

Notes on using the display illumination and battery life.

Casio 4378 Specifications

General

Model Number	4378
Brand	Casio
Category	Watch
Type	Digital
Display type	LCD
Water resistance	50 meters
Alarm	Yes
Stopwatch	Yes
Battery life	10 years
Backlight	LED
Calendar	Yes