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Operation Guide 2608 2638 2688

• At distances further than about 600 miles (1,000 kilometers) from the transmitter,

signal reception may not be possible during certain times of year or times of day.

Radio interferance may also cause problems with reception.

• See the information under "Signal Receive Troubleshooting" if you experience

problems with time calibration signal reception.

About Auto Receive

When auto receive is turned on, the watch automatically starts to receive the time

calibration signal when the time in the Timekeeping Mode reaches 2:00 a.m., 3:00

a.m., 4:00 a.m., and 5:00 a.m. each day (calibration times).

Note

• The auto receive operation is performed only if the watch is in the Timekeeping

Mode or World Time Mode when one of the calibration times is reached. It is not

performed if a calibration time is reached while an alarm is sounding, or while you

are configuring settings (while settings are flashing on the display).

• Auto receipt of the calibration signal is designed to be performed early in the

morning, while you sleep (provided that the Timekeeping Mode time is set correctly).

Before going to bed for the night, remove the watch from your wrist, and put it in a

location where it can easily receive the signal.

• When auto receive is turned on, the watch receives the calibration signal for two to

six minutes everyday when the Timekeeping Mode time reaches each of the

calibration times. Do not perform any button operation within six minutes before or

after any one of the calibration times. Doing so can interfere with correct calibration.

• Remember that reception of the calibration signal depends on the time kept in the

Timekeeping Mode. The receive operation will be performed whenever the display

shows any one of the calibration times, regardless of whether or not the

Timekeeping Mode time is actually the correct time.

• When two, three, or four receptions are successful, the watch uses the data of the

last reception for calibration. When only one reception is successful, the watch uses

the data of the successful reception.

About the Receiving Indicator

The receiving indicator shows the strength of the calibration signal being received. For

best reception, be sure to keep the watch in a location where signal strength is

strongest.

Modules 2608,

2638, and 2688

Module 2608

Module 2638

Receiving indicator

• Even in an area where signal strength is strong, it takes about 10 seconds for signal

reception to stabilize enough for the receiving indicator to indicate signal strength.

• Use the receiving indicator as a guide for checking signal strength and for finding

the best location for the watch during signal receive operations.

• Following reception of the time calibration signal and calibration of the watch's time

setting, the Level 4 receiving indicator will remain on the display in all modes. The

Level 4 receiving indicator will not be displayed if signal reception was unsuccessful

or after you adjust the current time setting manually.

• The Level 4 receiving indicator is displayed only when the watch is able to

successfully receive both time and date data. It does not appear when only time

data is received.

• The Level 4 receiving indicator indicates that at least one of the auto calibration

signal receive operations was successful. Note, however, that the Level 4 receiving

indicator is cleared from the display at 3:00 a.m. each day.

To perform manual receive

1. Place the watch on a stable surface so its top (12

o'clock side) is facing towards a window.

2. In the Timekeeping Mode, hold down D for about two

seconds until the watch beeps.

• Release D and the message RC! appears to indicate

that signal reception has started.

• Time calibration signal reception takes from two to six

minutes. Take care that you do not perform any button

Receiving indicator

operations or move the watch during this time.

• After signal reception is complete, the display of the

watch changes to the Last Signal screen.

Note

• To interrupt a receive operation and return to the Timekeeping Mode, press D.

• If the receive operation is unsuccessful, the message

for about one or two minutes. After that, the watch returns to the Timekeeping Mode.

• You can also change from the Last Signal or

timekeeping screen by pressing D.

To turn auto receive on and off

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Press C twice to move the flashing to the auto receive

on/off setting.

3. Press D to toggle auto receive on (ON) and off (OF).

• If the current Home City setting is a city code that

does not support signal receive, "xx" appears in

place of the on/off indicator. This means you cannot

On/off status

turn auto receive on or off.

4. Press A twice to exit the setting screen.

• For information about city codes that support signal

receive, see "To set your Home City".

To display the Last Signal screen

In the Timekeeping Mode, press D to display the Last Signal screen (indicated by

GET

). The Last Signal screen shows the date and time of the last successful time

calibration signal reception.

Day of week

indicator

Press D.

Month – Day

Hour : Minutes Seconds

Weak

Strong

(Level 1)

(Level 4)

ERR

appears on the display

ERR

screen to the normal

Receive time

Receive date

Last Signal Screen

Signal Receive Troubleshooting

Check the following points whenever you experience problems with calibration signal

reception.

Problem

Probable Cause

• The watch is not in the Timekeeping Mode.

Cannot perform

• Your current Home City is not one of the

manual receive.

following city codes:

LAX, DEN, CHI, or NYC.

• You changed the time setting manually.

Auto receive is

• The watch was not in the Timekeeping

turned on, but

the Level 4

or World Time Mode, or you performed

receiving

some button operation during the auto

indicator does

receive operation.

• Even if receive is successful, the Level

not appear on

the display.

4 receiving indicator disappears every

day at 3 am.

• Time data (hour, minutes, seconds) only

was received during the last receive

operation. The Level 4 receiving

indicator appears only when time data

and date data (year, month, day) are

both received.

• If the time is one hour off, the DST

Time setting is

setting may be incorrect.

incorrect

• The Home City code setting is not

following signal

correct for the area where you are using

reception.

the watch.

• For further information, see "Important!" under "Time Calibration Signal Reception"

and "Radio-controlled Atomic Timekeeping Precautions".

World Time

World Time shows the current time in 30 cities (29 time

City code

zones) around the world.

• For full information on city codes, see the "City Code

Table".

• The current time for all city codes in the World Time

Mode is calculated in accordance with the Greenwich

Mean Time (GMT) differential for each city, based on the

your Home City time setting.

• All of the operations in this section are performed in the

World Time Mode, which you enter by pressing C.

Home city time

Current time in the

selected city code

To view the time for another city code

While in the World Time Mode, press D to scroll through the city codes (time zones)

to the east or B to scroll to the west.

• If the current time shown for a city is wrong, check your Timekeeping Mode time and

Home City settings and make the necessary changes.

To toggle a city code time between Standard Time and Daylight Saving Time

1. In the World Time Mode, use B and D to display the

city code (time zone) whose Standard Time/Daylight

DST indicator

Saving Time setting you want to change.

2. Hold down A to toggle Daylight Saving Time (DST

indicator displayed) and Standard Time (DST indicator

not displayed).

• The DST indicator is on the display whenever you

display a city code for which Daylight Saving Time is

turned on.

• Note that the DST/Standard Time setting affects only the

Module 2608

currently displayed city code. Other city codes are not

affected.

• Daylight Saving Time (DST) advances the time setting

by one hour from Standard Time. Remember that not all

countries or even local areas use Daylight Saving Time.

• The watch will perform a signal receive operation even if

it is in the World Time Mode when a calibration time is

reached. If this happens, the World Time Mode time

settings will be adjusted in accordance with the Home

Module 2638

City time.

DST indicator

Module 2688

Time Recorder

The Time Recorder lets you store up to 30 records of the

current time (month, day, hour, minutes, seconds, and

Time record number

DST on/off setting) with the touch of a button. One way

you can use the Time Recorder is to record the start time

and the end time of a particular event.

To record a Time Recorder time

In the Timekeeping Mode, hold down B to record the

Home City time (month, day, hour, minutes, seconds, and

DST on/off setting).

• The recorded time flashes for about two seconds, and

Recorded date

then it is assigned a record number. After that, the

(Month–Day)

Timekeeping Mode screen appears.

Recorded time

• Records are assigned numbers sequentially from

(Hour : Minutes seconds)

through

#30

• Storing a new time record when there are already 30

records stored in memory automatically deletes record

#01

, shifts the remaining records upwards by 1, and

stores the new record as

What you should do

• Enter the Timekeeping Mode

and try again.

• Select LAX, DEN, CHI, or

NYC as your Home City.

• Perform manual signal receive

or wait until the next auto

signal receive operation is

performed.

• Check to make sure the

watch is in a location where it

can receive the signal.

• Change the DST setting to

Auto DST.

• Select the correct Home City

code.

#01

#30