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 Cfour times to enter the Hand Setting Mode.

 

 

 

 

2. Hold down Auntil

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 Dcauses 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 Dand Bto adjust the analog setting as described below.

When you want to do this:

Perform this button operation:

Move the hand setting

• Press D.

forward 10 seconds

 

 

 

Move the hand setting back

• Press B.

10 seconds

 

Move the hand setting a short

• Hold down D.

way forward at high speed

• Release Dwhen the hands reach the setting

 

you want.

Move the hand setting a

• Hold down B.

short way back at high speed

• Release Bwhen the hands reach the setting

 

you want.

Move the hand setting a long

• While holding down D to move the hands at

way forward at high speed

high-speed, press Bto 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

• While holding down B to move the hands at

way back at high speed

high-speed, press Dto 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

Initial Factory Default

City code

BER (Berlin) (Module 4378)

LON (London) (Module 4379)

DST (summer time)

(Auto switching)

 

 

 

Auto receive

(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 watch does this:

The first signal auto search operation

1. Checks the Mainflingen signal first.

after factory default settings are in effect,

2. If the Mainflingen signal cannot be

or after the city code has been changed

received, checks the Rugby signal.

Any case other than the above.

1. Checks the last successfully received

 

signal first.

 

2. If the last successfully received signal

 

cannot be received, checks the other

 

signal.

Module 4379

 

 

 

In this case:

The watch does this:

The first signal auto search operation

1. Checks the Rugby signal first.

after factory default settings are in effect,

2. If the Rugby signal cannot be received,

or after the city code has been changed

checks the Mainflingen signal.

Any case other than the above.

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

4378

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

 

engraved inside the box on the back cover.

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 Bto 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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