Casio 2578 User manual

USER’S GUIDE 2578
1
MO0212-A
AboutThis 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.
(Light)
General Guide
• In the Timekeeping Mode, use C(forward) and A(back) to scroll through the
mode names in the text area of the display. When the text area shows the mode you
want, press Bto enter the mode.
• In any mode, press Lto illuminate the display.
Timekeeping Mode Press C.
▲
▲
▲
▲
Press A.
▲
▲
▲
▲
▲
▲
▲
▲
WorldTime Mode
Alarm Mode Date Alert Mode
Time Recorder Mode
Stopwatch Mode
Time Setting Mode
▲
▲
Text area
Radio-controlledTimekeeping
This watch is designed to pick up a time calibration signal
transmitted from Mainflingen, Germany (located 25
kilometers southeast of Frankfurt), and update its time
setting accordingly. The time calibration signal includes
both Standard Time and Daylight Saving Time (summer
time) data.
CurrentTime 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.
• See “Setting the Time and Date Manually” for
information about manual settings.
Month – Day
PM
indicator
Day of week
Hour : Minutes Seconds
DST indicator
To set your Home City
1. From the Timekeeping Mode, use Cand Ato display
SET (Time Setting Mode) in the text area.
2. Press Bto enter the Time Setting Mode.
3. Press Bso the current city code is flashing in the text
area.
4. Use C(+) and A(–) to scroll through the city codes in
the text area until the one you want to use as your
Home City is displayed.
• The following are the city codes for major cities in the
Western Europe time zones.
BER and PAR: Berlin, Paris, Milan, Rome,
Amsterdam, Hamburg,
Frankfurt, Vienna
LON: London
5. Press Bnine times, until the text area shows the Time
Setting Mode indicator (SET).
6. Press Cto return to the Timekeeping Mode.
Text area
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
operation (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.
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 automatically picks up the time calibration signal three
times a day at 2:00 AM, 4:00 AM, and 6:00 AM. For more information, see “About
Auto Receive.”
•Manual Receive
Manual receive lets you start a time calibration receive operation with the press of a
button. For more information, see “To perform manual receive.”
Important!
• 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
• Proper signal reception can be difficult or even impossible under the conditions listed
below.
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to six minutes. Take care that you
do not perform any button operations or move the watch during this time.
Inside or
among
buildings
Inside a
vehicle
Near
household
appliances or
office
equipment
Near a
construction
site, airport, or
other sources
of electrical
noise
Near high-
tension
power lines
Among or
behind
mountains
• This watch is able to receive the time calibration signal
transmitted from Mainflingen, Germany (located 25
kilometers southeast of Frankfurt). Signal reception is
possible within the area represented by a circle with a
radius of about 1,000 kilometers.
• At distances further than about 500 kilometers, the
signal may become weak and reception may be
impossible under certain conditions.
• Signal reception may be poor in the shaded area on the
map, even though it is within 1,000 kilometers of the
signal transmitter.
• See the information under “Signal Receive
Troubleshooting” if you experience problems with time
calibration signal reception.
Frankfurt
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 AM, 4:00 AM,
and 6:00 AM 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 making 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 time in the Timekeeping Mode reaches each of the
three calibration times. Do not perform any button operation within six minutes
before or after any of the three 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 is performed whenever the display shows
one of the three calibration times, regardless of whether or not the Timekeeping
Mode time is actually the correct time.
• When two or three 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 Receive Indicator
The receive 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.
Receive indicator
Weak Strong

USER’S GUIDE 2578
2
Time setting is
incorrect
following signal
reception.
•Time data (hour, minutes, seconds) only
was received during the last receive
operation. The receive indicator appears
only when time data and date data
(year, month, day) are both received.
•If the time is one hour off, the DST
setting may be incorrect.
•The Home City code setting is not
correct for the area where you are using
the watch.
•Change the DST setting to
Auto DST.
•Select the correct Home City
code.
• Even in an area where signal strength is strong, it takes about 10 seconds for signal
reception to stabilize enough for the receive indicator to indicate signal strength.
• Use the receive indicator as a guide for checking signal strength and for finding the
best location for the watch during signal receive operations.
• The receive indicator remains on the display in all modes following reception of the
time calibration signal and calibration of the watch’s time setting. The receive
indicator does not appear if signal reception was unsuccessful or after manual
adjustment of the current time setting.
• The receive indicator appears 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 receive indicator indicates that at least one of the three calibration signal
receive operations was successful. Note, however, that the receive indicator is
cleared from the display at 3:00 AM 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.
• Note that signal reception is poor if the watch is on its
back or side.
2. In the Timekeeping Mode, hold down Bfor about two
seconds until the watch beeps.
3. Release Band the message RC! appears in the text
area 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
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 B.
• If the receive operation is unsuccessful, the message ERR appears on the display
for about one or two minutes. After that, the watch returns to the Timekeeping Mode.
Receive indicator
• You can also change from the Last Signal or ERR screen to the normal
timekeeping screen by pressing B.
To turn auto receive on and off
1. From the Timekeeping Mode, use Cand Ato display
SET (Time Setting Mode) in the text area.
2. Press Bto enter the Time Setting Mode.
3. Press Aor Cto toggle auto receive on (ON) and off
(OF).
• If the current Home City setting is a city code that
does not support auto receive, “xx” appears in place
of the on/off indicator. This means you cannot turn
auto receive on or off.
4. Press B10 times, until the text area shows the Time
Setting Mode indicator (SET).
5. Press Cto return to the Timekeeping Mode.
On/off status
Text area
To display the Last Signal screen
In the Timekeeping Mode, press Bto display the Last Signal screen (GET). The
Last Signal screen shows the date and time that the time calibration signal was last
received.
▲
▲
Press B.
Last Signal Screen
Receive date
Home city time Receive time
Alternate at two-
second interval
Signal ReceiveTroubleshooting
Check the following points whenever you experience problems with calibration signal
reception.
Problem
Cannot perform
manual receive.
Auto receive is
turned on, but
the receive
indicator does
not appear on
the display.
Probable Cause
• The watch is not in the Timekeeping Mode.
•Your current Home City is not one of the
following city codes:
BER, PAR, LON, or ATH.
•You changed the time setting manually.
•The watch was not in the Timekeeping
or World Time Mode, or you were
performing some button operation
during the auto receive operation.
• Even if receive is successful, the receive
indicator disappears every day at 3 am.
What you should do
•Enter the Timekeeping Mode
and try again.
•Select BER, PAR, LON, or
ATH 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.
• For further information, see “Time Calibration Signal Reception” and “Time
Calibration Signal Reception Precautions.”
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date.
Setting theTime and Date Manually
Make sure you select your Home City code before you
change the current time and date settings. World Time
Mode times are all displayed in accordance with the
Timekeeping Mode settings. Because of this, World Time
Mode times will not be correct if you do not select the
proper Home City code before setting the time and date in
the Timekeeping Mode.
Hour: Minutes Seconds
Day of week
PM indicator
Month — Day
DST indicator
To set the current time and date manually
1. From the Timekeeping Mode, use Cand Ato display
SET (Time Setting Mode) in the text area.
2. Press Bto enter the Time Setting Mode.
3. Press Bto cycle through the setting screens in the
sequence shown below.
City Code
Screen DST Screen
(DST)12/24-hour Format
(12H/24H)
Auto Receive
Screen (R/C)
Day Month Year Minutes Hour Seconds
Mode Indicator
(SET)
Time setting
Text area
4. Use the operations shown below to configure auto receive, city code, DST, and
12/24-hour format settings.
Text area
indicator: To do this:
Toggle between auto receive on
(ON) and off (OF)
Change the city code
Toggle between Daylight Saving
Time (ON) and Standard Time (OF)
Toggle between 12-hour (12H) and
24-hour (24H) timekeeping
Do this:
Press Aor C.
Use C(+) and A(–).
Press Aor C.
• Pressing Aor Cperforms
a different operation when
BER, PAR, LON, or ATH is
selected as Home City code.
See “To change the Daylight
Saving Time (summer time)
setting.”
Press Aor C.
R/C
BER
DST
12H
5. Press Bwhile 12H/ 24H is shown in the text area to advance to the time setting
screen, which is indicated by the seconds flashing.
6. Use the operations shown below to configure time and date settings.
Screen:
50
P10
58
'02
6
30
To do this:
Reset the seconds to 00
Change the hour
Change the minutes
Change the year
Change the month
Change the day
Do this:
Press Aor C.
Use C(+) and A(–).
7. To return to the Timekeeping Mode, use Bto scroll to the mode indicator (SET),
and then press C.
• See “City Code Table” for a complete list of available city codes.
• The auto receive setting is used for time calibration signal reception only. See “About
Auto Receive” for details.
Daylight SavingTime (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
The time calibration signal transmitted from Mainflingen includes both Standard Time
and DST data. When the Auto DST setting is turned on, the watch switches between
Standard Time and DST (summer time) automatically in accordance with the
Mainflingen signal.
• The default DST setting is Auto DST (A) whenever you select BER, PAR, LON,
or ATH as your Home City code.
• If you experience problems receiving the time calibration signal in your area, it is
probably best to switch between Standard Time and Daylight Saving Time (summer
time) manually.
To change the Daylight SavingTime (summer time) setting
1. From the Timekeeping Mode, use Cand Ato display SET (Time Setting Mode)
in the text area.
2. Press Bto enter the Time Setting Mode.
3. Press Btwice so DST is in the text area. This is the DST setting screen.
4. Use Cor Ato cycle through the DST settings in the sequence shown below.
5. When the setting you want is displayed, press Beight times, until the text area
shows the Time Setting Mode indicator (SET).
6. Press Cto return to the Timekeeping Mode.
Auto DST( ) DST Off( ) DST On( )

USER’S GUIDE 2578
3
World Time
The World Time shows the current time in 30 cities (29
time zones) around the world.
• If the current time shown for a city is wrong, check your
Home City time settings and make the necessary
changes.
• You can use the Time Setting Mode to change the DST
(summer time)/Standard Time settings for each city
code.
• 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
Timekeeping Mode’s Home City time.
• The World Time Mode always displays times using 24-
hour format, regardless of the 12-hour/24-hour format
setting in the Timekeeping Mode.
Home city
time DST
indicator
City Code
Current time in the
selected city code
To view the time in another city
1. From the Timekeeping Mode, use Cand Ato display WT (World Time Mode)
in the text area.
2. Press Bto enter the World Time Mode.
3. Press Cto scroll the city codes (time zones) in the text area to the east or Ato
scroll to the west.
• For full information on city codes, see the “City Code Table.”
To exit the WorldTime Mode
In the World Time Mode, press Band the text area shows the World Time Mode
indicator ( WT).
• After returning to the World Time Mode indicator ( WT), you can use Cand Ato
change to another mode.
Alarms
The Alarm Mode gives you a choice of four one-time
alarms and one snooze alarm. One of the one-time
alarms functions as a “target alarm,” which counts the time
remaining from the current Home City time to the target
alarm time.
Also use the Alarm Mode to turn the Hourly Time Signal
on and off.
• There are five alarms named AL1, AL2, AL3, TAL
(target alarm), and SNZ. The alarm names appear in
the text area of the display.
• You can configure SNZ as a snooze alarm only.
Alarms AL1, AL2, AL3, and TAL can be used as
one-time alarms only.
To enter the Alarm Mode
1. From the Timekeeping Mode, use Cand Ato display
ALM (Alarm Mode) in the text area.
2. Press Bto enter the Alarm Mode.
Home
city time
Alarm time
(Hour : Minutes)
Text area
(Alarm name)
To set an alarm time
1. Enter the Alarm Mode.
2. Use Cand Ato scroll through the alarm name
screens until the name of one whose time you want to
set is shown in the text area.
3. After you select an alarm, press B. This causes the
alarm’s on (ON) /off (OF) setting to flash, which
indicates the setting screen.
4. Press Cor Ato turn the alarm on.
• Note that the above step is necessary when you want
to set the alarm time. You cannot change the alarm
time setting while an alarm is turned off.
AL1 AL2 AL3
SIG SNZ TAL
Press C. /Press A.
On/off status
5. Use Bto move the flashing between settings as
shown below.
• Note that the hour and minutes do not appear if the
alarm is turned off.
6. While the on/off setting is flashing, press Cor Ato
toggle it on (ON) and off (OF).
7. While the hour or minute setting is flashing, use C(+)
and A(–) to change it.
8. After setting the minutes, press Btwice to return to the
alarm name screen.
• With the target alarm (TAL), the time starts to
countdown as soon as you set the alarm time.
Countdown
(Hours : Minutes Seconds)
Target Alarm Screen
MinutesOn/Off Setting Hour
Alarm Mode
(
ALM ) Screen
Alarm Name Screen
Note
• When setting the alarm time using the 12-hour format, take care to set the time
correctly as a.m. (no indicator) or p.m. (Pindicator).
Alarm Operation
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in. In the case of the snooze alarm, the alarm operation is performed a total
of seven times, every five minutes, until you turn the alarm off.
The target alarm counts the time remaining from the current Home City time to the
target alarm time.
• Pressing any button stops the alarm tone operation.
• Performing any one of the following operations during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the time setting screen
Displaying the alarm setting screen
To test the alarm
• In the Alarm Mode, hold down Cto sound the alarm.
To turn an alarm on and off
1. Enter the Alarm Mode, and then use Cand Ato
display the alarm name screen of the alarm you want.
2. After you select an alarm, press Band the alarm’s on/
off setting (ON or OF) starts to flash, which indicates
the setting screen.
3. While the on/off setting is flashing, use Cor Ato
toggle it on (ON) and off (OF).
4. Press Bto return to the alarm name screen.
• If the alarm is on, press Bfour times. If the alarm is off,
press Btwice.
• The snooze on indicator ( ) flashes during the 5-
minute interval between alarms.
• The alarm on indicator ( ) and snooze on indicator
() are displayed in all modes.
• In all modes, the alarm on indicator is shown for any
alarm (AL1, AL2, AL3, TAL, SNZ) that is
currently turned on.
Snooze on
indicator
Alarm on
indicator
On/off status
To turn the HourlyTime Signal on and off
1. Enter the Alarm Mode, and then use Cand Ato
display Hourly Time Signal setting screen (SIG).
2. Press B. This causes the on (ON) /off (OF) start to
flash, which indicates the setting screen.
3. While the on/off setting is flashing, use Cor Ato
toggle it on (ON) and off (OF).
4. Press Btwice to return to the alarm name screen.
• The Hourly Time Signal on indicator ( ) is displayed
in all modes when the Hourly Time Signal is turned on.
To exit an Alarm Name Screen
To get from an alarm name screen to the initial Alarm Mode (ALM) screen, you need
to press Bto cycle through the alarm settings.
How many times depends on whether the currently displayed alarm is on or off as
shown below.
Hourly time signal
on indicator
On/off status
•Alarms (AL1, AL2, AL3, TAL, SNZ)
Alarm On:
Alarm Name
Screen Alarm Mode ( ALM ) Screen
Alarm On
(ON)Hour Minutes
Alarm Off:
Alarm Name
Screen Alarm Mode ( ALM ) Screen
Alarm Off
(OF)
•HourlyTime Signal (SIG)
Signal On or Off:
Alarm Name
Screen Alarm Mode (ALM) Screen
Signal
On (ON) /Off (OF)
• After returning to the Alarm Mode (ALM) screen, you can use Cand Ato change
to another mode.
Date Alert
Date Alert helps you to remember an important date. After you set an alert date
(month and day), a date alert indicator (!) and the current date flash for 24 hours after
the alert date arrives in the Timekeeping Mode.You can set up to five different date
alerts.
To enter the Date Alert Mode
1. From the Timekeeping Mode, use Cand Ato display D/A (Date Alert Mode) in
the text area.
2. Press Bto enter the Date Alert Mode.
Alert Date
(Month-Day)
Home city
time
On/off status
Text area
(Alert name)
▲
Current date
(Month-Day) Date alert on
indicator
Date Alert Mode Screen Timekeeping Mode Screen
To set the alert date
1. Enter the Date Alert Mode, and then use Cand Ato
scroll through the alert name screens until the one
whose date you want to set is displayed.
2. After you set an alert, press B. This causes the on
(ON) /off (OF) setting to start to flash, which indicates
the setting screen.
3. Press Bto move the flashing in the sequence shown
below.
On/off status
DA1 DA2 DA3
DA5 DA4
Press C. /Press A.
• Note that the month and day do not appear if the alert is turned off.
4. While the on/off setting is flashing, press Cor Ato toggle it on (ON) and off (OF).
5. While the month or day setting is flashing, use C(+) and A(–) to change it.
6. After setting the day, press Btwice to return to the alert name screen.
To exit an Alert Name Screen
To get from an alert name screen to the initial Date Alert Mode (D/A) screen, you
need to press Bto cycle through the date alert settings.
How many times depends on whether the currently displayed date alert is on or off as
shown below.
DayAlert On/Off Month
Date Alert Mode
(
D/A ) Screen
Alert Name
Screen
Alert date

USER’S GUIDE 2578
4
• Alert On:
Alert Name
Screen Date Alert Mode ( D/A ) Screen
On/Off
Setting Month Day
Alert Off:
Alert Name
Screen Date Alert Mode (D/A) Screen
On/Off
Setting
• After returning to the Date Alert Mode (D/A) screen, you can use Cand Ato
change to another mode.
Time Recorder
The Time Recorder Mode lets you store up to 50 time
entries (hour, minutes, seconds) with the touch of a
button. One way you can use the Time Recorder Mode is
to record the start time and the end time of a particular
event.
• The Time Recorder Mode always displays times using
24-hour format, regardless of the 12-hour/24-hour
format setting in the Timekeeping Mode.
To enter the Time Recorder Mode
1. From the Timekeeping Mode, use Cand Ato display
T/S (Time Recorder Mode) in the text area.
2. Press Bto enter the Time Recorder Mode.
To record aTime Recorder time
1. Enter the Time Recorder Mode.
• This displays the Time Recorder standby screen.
Home city
time
Seconds
Standby Screen
Text area
2. Press Cto record the current time (hour, minutes,
seconds).
• The recorded time flashes for about two seconds and
then assigned the next available record number, in the
range of T1 through T50. Next the time recorder
standby screen appears.
• A new time is recorded each time you press Cwhile
the standby screen is on the display.
• Records are assigned numbers sequentially from T1
through T50.
• Storing a new time record when there are already 50
records stored in memory automatically deletes record
T1, shifts the remaining records upwards by 1, and
stores the new record as T50.
To recall Time Recorder times
Enter the Time Recorder Mode, and then press Ato
scroll through times stored in memory.
• Each press of Ascrolls through time records from
higher numbered (newer) records to lower numbered
records.
To delete allTime Recorder times
Enter the Time Recorder Mode, and then press Aand
Cat the same time to delete all Time Recorder times.
To exit theTime Recorder Mode
In the Time Recorder Mode, press Band the text area
shows the Time Recorder Mode indicator (T/S).
• After returning to the Time Recorder Mode indicator
(T/S), you can use Cand Ato change to another
mode.
Recorded time
(Hour : Minutes
Seconds)
Time record
number
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
• The display range of the stopwatch is 23 hours, 59
minutes, 59.99 seconds.
• The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
• Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
• The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
To enter the Stopwatch Mode
1. From the Timekeeping Mode, use Cand Ato display
STW (Stopwatch Mode) in the text area.
2. Press Bto enter the Stopwatch Mode.
Seconds
Home city
time
1/100
second Minutes
Hours
To measure times with the stopwatch
C
Start Stop
ElapsedTime
➤Re-start Clear
C➤Stop
C➤C➤A
SplitTime
C
Start Split
➤Split release Clear
A➤Stop
A➤C➤A
Two Finishes
C
Start Split
➤Stop Clear
A➤Split release
C➤A➤A
First runner
finishes.
Display time of
first runner.
Second runner
finishes. Display time of second runner.
To exit the Stopwatch Mode
In the Stopwatch Mode, press Band the text area shows the Stopwatch Mode
indicator (STW).
• After returning to the Stopwatch Mode indicator (STW), you can use Cand Ato
change to another mode.
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 Date Alert Mode or Time Setting Mode, or with a mode
indicator in the text area for two or three minutes without performing any operation, it
automatically changes to the Timekeeping Mode.
• If you leave the watch with a flashing setting or cursor on the display two or three
minutes without performing any operation, it automatically saves any settings you
have made up to that point and exits the setting screen.
Scrolling
The Aand Cbuttons 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, Alarm, or Date Alert Mode, the data you were
viewing when you last exited the mode appears first.
Time Calibration Signal Reception Precautions
• Strong electrostatic charge can result in the wrong time being set.
• Even when the watch is within the reception range of the transmitter, signal
reception is impossible if the signal is blocked by mountains or other geological
formations between the watch and signal source.
• Signal reception is affected by weather, atmospheric conditions, and seasonal
changes.
• The time calibration signal is bounced 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.
• The watch is designed to automatically update the date and day of the week for the
period January 1, 2000 to December 31, 2039. Setting of the date by the time
calibration signal cannot be performed starting from January 1, 2040.
• 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.
• When all three auto receptions are successful (2:00 AM, 4:00 AM, and 6:00 AM), 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.
• 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 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 ±15 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 current 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)
A(Auto switching)
DST
ON (Auto receive)
R/C
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 2039.
• 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.
* The letters “UTC”stands for “Universal Time Coordinated,”which 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-hourTimekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also
applied in the Alarm Mode.
The World Time Mode and Time Recorder Mode always display times using 24-hour
format, regardless of the 12-hour/24-hour format setting in the Timekeeping Mode.
• In all modes besides the Timekeeping Mode, the current Home City time in the
upper left corner of the display is always displayed using 24-hour format.
• 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.The
indicator 24 indicates the 24-hour format.

USER’S GUIDE 2578
5
HONOLULU
ANCHORAGE
LOS ANGELES
DENVER
CHICAGO
NEW YORK
CARACAS
RIO DE JANEIRO
LONDON
PARIS
BERLIN
– – –
HNL
ANC
LAX
DEN
CHI
NYC
CCS
RIO
– – –
– – –
GMT
LON
PAR
BER
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
+0
+1
PAGO PAGO
PAPEETE
NOME
SAN FRANCISCO, LAS VEGAS, VANCOUVER,
SEATTLE, DAWSON CITY
EL PASO, EDMONTON
HOUSTON, DALLAS/FORT WORTH,
NEW ORLEANS, MEXICO CITY, WINNIPEG
MONTREAL, DETROIT, MIAMI, BOSTON,
PANAMA CITY, HAVANA, LIMA, BOGOTA
LA PAZ, SANTIAGO, PORT OF SPAIN
SAO PAULO, BUENOS AIRES, BRASILIA,
MONTEVIDEO
PRAIA
DUBLIN, LISBON, CASABLANCA, DAKAR,
ABIDJAN
MILAN, ROME, MADRID, AMSTERDAM, ALGIERS,
HAMBURG, FRANKFURT, VIENNA, STOCKHOLM
Backlight Precautions
The backlight uses an EL (electro-luminescent) panel that causes the entire display to
glow for easy reading in the dark.
In any mode, press Lto illuminate the display for about one second.
• The electro-luminescent panel that provides illumination loses power after very long
use.
• The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
• The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
• The backlight automatically turns off whenever an alarm sounds.
• Frequent use of the backlight shortens the battery life.
City City GMT Other major cities in same time zone
Code Differential
City CodeTable
ATHENS
CAIRO
JERUSALEM
JEDDAH
TEHRAN
DUBAI
KABUL
KARACHI
DELHI
DHAKA
YANGON
BANGKOK
HONG KONG
TOKYO
SEOUL
ADELAIDE
SYDNEY
NOUMEA
WELLINGTON
+2
+3
+3.5
+4
+4.5
+5
+5.5
+6
+6.5
+7
+8
+9
+9.5
+10
+11
+12
HELSINKI, ISTANBUL, BEIRUT, DAMASCUS,
CAPE TOWN
KUWAIT, RIYADH, ADEN, ADDIS ABABA, NAIROBI,
MOSCOW
SHIRAZ
ABU DHABI, MUSCAT
MALE
MUMBAI, KOLKATA
COLOMBO
JAKARTA, PHNOM PENH, HANOI, VIENTIANE
SINGAPORE, KUALA LUMPUR, BEIJING, TAIPEI,
MANILA, PERTH, ULAANBAATAR
PYONGYANG
DARWIN
MELBOURNE, GUAM, RABAUL
PORT VILA
CHRISTCHURCH, NADI, NAURU ISLAND
ATH
CAI
JRS
JED
THR
DXB
KBL
KHI
DEL
DAC
RGN
BKK
HKG
TYO
SEL
ADL
SYD
NOU
WLG
•Based on data as of June 2002.