Manual Casio 4378 (page 4 of 5) (English)

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Operation Guide 4378 4379

Analog Timekeeping

The analog time of this watch is synchronized with the digital time. The analog time

setting is adjusted automatically whenever you change the digital time.

Note

• The hands for the analog timepiece move to adjust to a new setting whenever any of

the following occurs.

When you change the digital time setting manually

When the digital time setting is changed by time calibration signal reception

When you change the Home City code and/or DST setting

• If the analog time does not match the digital time for any reason, use the procedure

described under “To adjust the analog time” to match the analog setting to the digital

setting.

• Whenever you need to adjust both the digital and the analog time settings manually,

make sure you adjust the digital setting first.

• Depending on how much the hands have to move in order to adjust to the digital

time, it may take some time before they stop moving.

To adjust the analog time

1. In the Timekeeping Mode, press C four times to enter

the Hand Setting Mode.

2. Hold down A until

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.

3. If the second hand is not pointing precisely at 12 o’clock

at this time, use D to adjust its position.

• Each press of D causes the second hand to advance

by one second.

4. Press C. This will cause the time on the digital display to flash, which indicates that

adjustment of hour and minute hands is selected.

5. Use D and B to adjust the analog setting as described below.

When you want to do this:

Move the hand setting

forward 10 seconds

Perform this button operation:

• Press D.

Move the hand setting back

10 seconds

Move the hand setting a short

way forward at high speed

Move the hand setting a

short way back at high speed

Move the hand setting a long

way forward at high speed

• Press B.

• Hold down D.

• Release D when the hands reach the setting

you want.

• Hold down B.

• Release B when the hands reach the setting

you want.

• While holding down D to move the hands at

high-speed, press B to lock the high-speed

hand movement.

• To stop the hand movement, press any

button.

• Hand movement stops automatically if the

hour hand makes one full (12-hour) revolution.

Move the hand setting a long

way back at high speed

• While holding down B to move the hands at

high-speed, press D to lock the high-speed

hand movement.

• To stop the hand movement, press any

button.

• Hand movement stops automatically if the hour

hand makes one full (12-hour) revolution.

6. Press A to exit the setting screen.

• The minute hand will be adjusted slightly to match the seconds when you exit the

setting screen.

• To return to the Timekeeping Mode, press C.

Reference

This section contains more detailed and technical information about watch operation.

It also contains important precautions and notes about the various features and

functions of this watch.

Auto Return Features

• If you leave the watch in the Alarm or Hand Setting Mode for two or three minutes

without performing any operation, it automatically returns to the Timekeeping Mode.

• If you leave the watch with a flashing setting on the display for two or three minutes

without performing any operation, the watch automatically exits the setting screen.

Scrolling

The B and D buttons are used in various modes and setting screens to scroll

through data on the display. In most cases, holding down these buttons during a scroll

operation scrolls through the data at high speed.

Initial Screens

When you enter the World Time or Alarm Mode, the data you were viewing when you

last exited the mode appears first.

Radio-controlled Timekeeping Precautions

• Strong electrostatic charge can result in the wrong time being set.

• The time calibration signal bounces off the ionosphere. Because of this, such factors

as changes in the reflectivity of the ionosphere, as well as movement of the

ionosphere to higher altitudes due to seasonal atmospheric changes or the time of

day may change the reception range of the signal and make reception temporarily

impossible.

• Even if the time calibration signal is received properly, certain conditions can cause

the time setting to be off by up to one second.

• The current time setting in accordance with the time calibration signal takes priority

over any time settings you make manually.

• The watch is designed to automatically update the date and day of the week for the

period January 1, 2000 to December 31, 2099. Setting of the date by the time

calibration signal cannot be performed starting from January 1, 2100.

• This watch can receive signals that differentiate between leap years and non-leap

years.

• Though this watch is designed to receive both time data (hour, minutes, seconds)

and date data (year, month, day), certain signal conditions can limit reception to time

data only.

• Normally, the signal reception date shown by the last signal screen is the date data

included in the received time calibration signal. When only time data is received,

however, the last signal screen shows the date as kept in the Timekeeping Mode at

the time of signal reception.

• If you are in an area where proper time calibration signal reception is impossible, the

watch keeps time within ±20 seconds a month at normal temperature.

• If you have problems with proper time calibration signal reception or if the time

setting is wrong after signal reception, check your Home City code, DST (summer

time), and auto receive settings. The following are the initial factory defaults for these

settings.

Setting

City code

DST (summer time)

Auto receive

Initial Factory Default

BER (Berlin) (Module 4378) LON (London) (Module 4379)

(Auto switching)

(Auto receive)

Transmitters

This watch is designed to receive the time calibration signal transmitted from Rugby,

England and the signal from Mainflingen, Germany.

• The following explains how the watch determines which transmitter it should check

first.

Module 4378

In this case:

The first signal auto search operation

after factory default settings are in effect,

or after the city code has been changed

Any case other than the above.

The watch does this:

1. Checks the Mainflingen signal first.

2. If the Mainflingen signal cannot be

received, checks the Rugby signal.

1. Checks the last successfully received

signal first.

2. If the last successfully received signal

cannot be received, checks the other

signal.

• To find out the module number of your watch, look at its

back cover. The Module number (4378 or 4379) is

engraved inside the box on the back cover.

In this case:

The first signal auto search operation

after factory default settings are in effect,

or after the city code has been changed

Any case other than the above.

The watch does this:

1. Checks the Rugby signal first.

2. If the Rugby signal cannot be received,

checks the Mainflingen signal.

1. Checks the last successfully received

signal first.

2. If the last successfully received signal

cannot be received, checks the other

signal.

4378

4379

Module 4379

Timekeeping

• Resetting the seconds to 00 while the current count is in the range of 30 to 59

causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are

reset to 00

without changing the minutes.

• The day of the week is automatically displayed in accordance with the date (year,

month, and day) settings.

• The year can be set in the range of 2000 to 2099.

• The watch’s built-in full automatic calendar makes allowances for different month

lengths and leap years. Once you set the date, there should be no reason to change

it except after you have the watch’s battery replaced.

• The current time for all city codes in the Timekeeping Mode and World Time Mode is

calculated in accordance with the Greenwich Mean Time (GMT) differential for each

city, based on your Home City time setting.

• GMT differential is calculated by this watch based on Universal Time Coordinated

(UTC*) data.

* UTC is the world-wide scientific standard of timekeeping. It is based upon carefully

maintained atomic (cesium) clocks that keep time accurately to within microseconds. Leap

seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s rotation.

The reference point for UTC is Greenwich, England.

12-hour/24-hour Timekeeping Formats

The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also

applied in all other modes.

• With the 12-hour format, the P (PM) indicator appears on the display for times in the

range of noon to 11:59 p.m. and no indicator appears for times in the range of

midnight to 11:59 a.m.

• With the 24-hour format, times are displayed in the range of 0:00 to 23:59 without

any indicator.

Illumination Precautions

An LED (light-emitting diode) and a light guide panel illuminate the digital display for

easy reading in the dark. In any mode, press B to illuminate the display for about one

second.

• The illumination provided by the light may be hard to see when viewed under direct

sunlight.

• Illumination automatically turns off whenever an alarm sounds.

• Frequent use of illumination shortens the battery operating time.

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Casio 4378 Manual

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