Casio 5088 User manual

1
Operation Guide 5088
MA0910-EA
Congratulations upon your selection of this CASIO watch.
This watch does not have a city code that corresponds to the UTC offset of –3.5
hours. Because of this, the radio-controlled atomic timekeeping function will not
display the correct time for Newfoundland, Canada.
Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any
damage or loss suffered by you or any third party arising through the use of this
product or its malfunction.
About This Manual
Button operations are indicated using the letters A
through Dshown in the illustration.
Hand Functions
z Hour Hand
x Second Hand
c Minute Hand
v Upper Left Dial Hand
b Lower Left Dial Hands
n Right Dial Hand: Indicates the current mode.
m Day
This User’s Guide uses numbers shown above to identify
watch hands and indicators.
Things to check before using the watch
1. Hold down Cfor about two seconds to enter the Timekeeping Mode, and
then observe the movement of the xSecond Hand.
Is the xSecond Hand moving smoothly in one-second intervals?
Is the xSecond Hand moving at
two-second intervals or is it stopped
completely?
Go to step 2.
The watch is charged sufficiently.
For details about charging, see
“Charging the Watch”.
Power is low. Charge the watch by placing
it in a location where it is exposed to light.
For details, see “Charging the Watch”.
NO
YES
YES
NEXT
2. Check the Home City and the daylight saving time (DST) setting.
Use the procedure under “To configure Home City settings” to configure your Home
City and daylight saving time settings.
Important!
Proper time calibration signal reception and World Time settings depend on correct
Home City, time, and date settings in the Timekeeping Mode. Make sure you
configure these settings correctly.
3. Set the current time.
To set the time using a time calibration signal
See “To get ready for a receive operation”.
To set the time manually
See “Configuring Current Time and Date Settings Manually”.
The watch is now ready for use.
For details about the watch’s radio controlled timekeeping feature, see “Radio
Controlled Atomic Timekeeping”.
Charging the Watch
The face of the watch is a solar cell that generates power from light. The generated
power charges a built-in rechargeable battery, which powers watch operations. The
watch charges whenever it is exposed to light.
Charging Guide
Whenever you are not
wearing the watch, be sure
to leave it in a location
where it is exposed to light.
Best charging
performance is achieved
by exposing the watch to
light that is as strong as
possible.
When wearing the watch,
makes sure that its face is
not blocked from light by the
sleeve of your clothing.
The watch may enter a
sleep state if its face is
blocked by your sleeve
even only partially.
Warning!
Leaving the watch in bright light for charging can cause it to become quite hot.
Take care when handling the watch to avoid burn injury. The watch can become
particularly hot when exposed to the following conditions for long periods.
On the dashboard of a car parked in direct sunlight
Too close to an incandescent lamp
Under direct sunlight
Important!
Keep the watch in an area normally exposed to bright light when storing it for long
periods. This helps to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause power to run down.
Make sure that the watch is exposed to bright light whenever possible.

B +@
* 6> 5
Power Levels
You can get an idea of the watch’s power level by
observing the movement of the xSecond Hand in the
Timekeeping Mode.
If thexSecond Hand is moving normally in one-second
intervals, power is at Level 1.
If thexSecond Hand is moving at two-second intervals,
power is at Level 2, which is quite low. Expose the watch
to light as soon as possible so it can charge.
Level Hand Movement Function Status
1 Normal. All functions enabled
2
xSecond Hand moving at two-second
intervals.
mDay changes to 1(home position).
Beeper and time calibration signal
reception disabled
3
xSecond Hand stopped.
z Hour Hand and cMinute Hand stopped
at 12 o’clock.
All functions disabled
When power drops to Level 3, all functions will be disabled but the watch will
continue to keep time internally for about one week. If you recharge the battery
sufficiently during this period, the analog hands will move automatically to the
correct setting and regular timekeeping will resume. After one week, all settings
(including timekeeping) will be cleared. Recharging the battery will reset all settings
to their initial factory defaults.
Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation
temporarily whenever power suddenly drops below a certain level due to overuse
of the alarm tone over a short period. Note that all operations are disabled while the
watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal
operation after power recovers (in about 15 minutes). Putting the watch in a location
where it is exposed to light will help power to recover sooner.
Charging Times
Exposure Level (Brightness)
Daily
Operation
*1
Level Change *2
Level 3 Level 2 Level 1
Outdoor sunlight (50,000 lux) 8 minutes 2 hours 24 hours
Window sunlight (10,000 lux) 30 minutes 6 hours 90 hours
Window sunlight on cloudy day
(5,000 lux) 48 minutes 8 hours – – –
Indoor fluorescent lighting (500 lux) 8 hours 92 hours – – –
1 Approximate exposure each day to generate power for normal daily operation.*
2 Approximate exposure to take power up one level.*
The above exposure times all are for reference only. Actual exposure times depend
on lighting conditions.
For details about the operating time and daily operating conditions, see the “Power
Supply” section of the Specifications.
Power Saving
Power Saving enters a sleep state automatically whenever the watch is left for a
certain period in an area where it is dark. The table below shows how watch functions
are affected by Power Saving.
There actually are two sleep state levels: “second hand sleep” and “function sleep”.
Elapsed Time in Dark Operation
60 to 70 minutes (second hand
sleep)
xSecond Hand only is stopped at 12 o’clock, all other
functions are enabled.
6 or 7 days (function sleep) All functions, including analog timekeeping, disabled
Internal timekeeping maintained.
The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch
is already in a sleep state when 6:00 AM arrives, however, it will remain in the sleep
state.
The watch will not enter a sleep state while it is in the Stopwatch Mode.
To recover from the sleep state
Move the watch to a well-lit area or press any button.
Radio Controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly.
However, when using the watch outside of areas covered by time calibration signals,
you will have to adjust the settings manually as required. See “Configuring Current
Time and Date Settings Manually” for more information.
This section explains how the watch updates its time settings when the city code
selected as the Home City is in Japan, North America, Europe, or China, and is one
that supports time calibration signal reception.
If your Home City Code setting
is this:
The watch can receive the signal from the
transmitter located here:
LON, PAR, ATH Anthorn (England), Mainflingen (Germany)
HKG Shangqiu City (China)
TYO Fukushima (Japan), Fukuoka/Saga (Japan)
HNL, ANC, LAX, DEN, CHI, NYC Fort Collins, Colorado (United States)
Important!
The areas covered byHNL and ANC are quite far from the calibration signal
transmitters, so certain conditions may cause reception problems.
WhenHNL or HKG is selected as the Home City, only the time and date are
adjusted according to the time calibration signal. You need to switch manually
between standard time and daylight saving time (DST) if required. See “To toggle
the Home City time between standard time and daylight saving time” for information
about how to do this.

B +
5@
Moving at two-second
intervals.

2
Operation Guide 5088
Approximate Reception Ranges
UK and German Signals North American Signal
Anthorn
500 kilometers
1,500 kilometers
Mainflingen
The Anthorn signal is receivable
within this area.
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
Japanese Signal Chinese Signal
Fukushima
500 kilometers
1,000 kilometers
Fukuoka/Saga
1,500 kilometers
Changchun500 kilometers
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
Even when the watch is within range of a transmitter, signal reception may be
impossible due to the effects of geographic contours, structures, weather, the time
of year, the time of day, radio interference, etc. The signal becomes weaker at
distances of approximately 500 kilometers, which means that the influence of the
conditions listed above becomes even greater.
Signal reception may not be possible at the distances noted below during certain
times of the year or day. Radio interference may also cause problems with
reception.
Mainflingen (Germany) or Anthorn (England) transmitters: 500 kilometers−
(310 miles)
Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)−
Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles)−
Shangqiu (China) transmitter: 500 kilometers (310 miles)−
As of January 2009, China does not use Daylight Saving Time (DST). If China does
go to the Daylight Saving Time system in the future, some functions of this watch
may no longer operate correctly.
To get ready for a receive operation
Confirm that the watch is in the Timekeeping Mode. If it isn’t, hold down1. Cfor
about two seconds to enter the Timekeeping Mode.
Place the watch in a location where signal reception is good.2.
Position the watch as shown in the
nearby illustration, with 12 o’clock
pointed towards a window. Make
sure there are no metal objects
nearby.
Signal reception normally is better
at night.
The receive operation takes from two
to seven minutes, but in some cases
it can take as long as 14 minutes.
Take care that you do not perform
any button operation or move the
watch during this time.
Signal reception may be difficult or even impossible under the conditions
described 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
What you should do next depends on whether you are using Auto Receive or3.
Manual Receive.
Auto Receive: Leave the watch over night in the location you selected in step 2.
See “Auto Receive” for details.
Manual Receive: Perform the operation under “To perform manual receive”.
Auto Receive
With Auto Receive, the watch performs the receive operation each day
automatically up to six times (up to five times for the Chinese calibration signal)
between the hours of midnight and 5 a.m. (according to the Timekeeping Mode
time). When any receive operation is successful, none of the other receive
operations for that day are performed.
When a calibration time is reached, the watch will perform the receive operation
only if it is in the Timekeeping Mode or World Time Mode. The receive operation is
not performed if a calibration time is reached while you are configuring settings.
12 o’clock
or
To perform manual receive
In the Timekeeping Mode, keep1. Adepressed (for about two seconds) as the
xSecond Hand goes through the following sequence.
Moves toYES (or Yfor some models) or NO (N) to indicate the last signal
reception result, then to READY (R).
The2. xSecond Hand indicates the operations the watch is currently performing.
When the xSecond
Hand is pointed here: It means this:
READY (R) Watch is setting up for reception.
WORK (W) Reception is in progress.
YES (Y) Reception was completed
successfully.
NO (N) Reception failed for some reason.
If signal reception is unstable, thexSecond Hand
may move between WORK (W) and READY (R).
The receive operation is complete when the3. xSecond
Hand moves to YES (Y) or NO (N) for about five
seconds, and then resumes regular timekeeping.
You can return to the Timekeeping Mode manually by
pressing Awhile the xSecond Hand is pointing to
YES (Y) or NO (N).
When the receive operation is successful, the watch
adjusts the time setting accordingly. It does not adjust
the setting if the operation failed.
Note
To interrupt a receive operation and return to the
Timekeeping Mode, press any button.
To check the result of the latest receive operation
In the Timekeeping Mode, press A.
ThexSecond Hand will move to YES (Y) for five
seconds if the latest receive operation was successful,
or NO (N) if it was not. After that, regular timekeeping
will resume.
You can return to the Timekeeping Mode manually by
pressing Awhile the xSecond Hand is pointing to YES
(Y) or NO (N).
Note
ThexSecond Hand will indicate NO (N) if you have
adjusted the time or date setting manually since the
latest receive operation.
Radio-controlled Atomic Timekeeping Precautions
Strong electrostatic charge can result in the wrong time setting.
Even if a receive operation is successful, certain conditions can cause the time
setting to be off by up to one second.
The watch is designed to update the date and day of the week automatically for
the period January 1, 2000 to December 31, 2099. Updating of the date by signal
reception will no longer be performed starting from January 1, 2100.
If you are in an area where signal reception is not possible, the watch keeps time
with the precision noted in “Specifications”.
The receive operation is disabled under any of the following conditions.
While power is at Level 2 or lower−
While the watch is in the power recovery mode−
When the watch is in the function sleep state (power saving)−
A receive operation is cancelled if an alarm sounds while it is being performed.
Mode Reference Guide
Your watch has five “modes”. The mode you should select depends on what you want
to do.
To do this: Enter this mode:
View the current time in your Home City and in one of 29
other cities around the globe
View the current date in the Home City
Configure Home City and daylight saving time (DST)
settings
Perform a time calibration receive operation
Configure time and date settings manually
Timekeeping Mode
Use the stopwatch to measure elapsed time Stopwatch Mode
View the current time in one of 29 cities (time zones) around
the globe World Time Mode
Set an alarm time Alarm Mode
Selecting a Mode
With this watch, everything starts from the Timekeeping Mode.
To determine the watch’s current mode
Check the position of the nRight Dial Hand as shown
under “To select a mode”.
To return to the Timekeeping Mode from any other
mode
Hold down Cfor about two seconds until the watch beeps
twice.

@

@

@

6

3
Operation Guide 5088
To select a mode
Press Cto cycle between the modes as shown below. The nRight Dial Hand
indicates the currently selected mode.
6
Timekeeping Mode Stopwatch Mode
Alarm Mode World Time Mode
The hand indicates
the day of the week
(SU, MO, TU, WE, TH,
FR, SA).
The hand points to 0.
The hand points to AL. The hand points to
STD or DST.
C
Timekeeping
Use the Timekeeping Mode to view the current time and date. To enter the
Timekeeping Mode from any other mode, hold down Cfor about two seconds.
Hand Functions
z Hour Hand
x Second Hand
c Minute Hand
v Upper Left Dial Hand: Indicates the current hour in
the Home City time in 24-hour
format.
b Lower Left Dial Hands:
Indicate the current time in the World Time City in
24-hour format.
n Right Dial Hand: Indicates the day of the week.
m Day
Configuring Home City Settings
There are two Home City settings: actually selecting the Home City and selecting
either standard time or daylight saving time (DST).
To configure Home City settings
Note
This watch does not have a city code that corresponds
to Newfoundland.
In the Timekeeping Mode, keep1. Adepressed (for about
five seconds) as the xSecond Hand goes through the
following sequence.
Moves toYES (or Yfor some models) or NO (N)
to indicate the last signal reception result, then to
READY (R), and then to the city code of the currently
selected Home City.
This indicates the city code setting mode.
The watch will exit the setting mode automatically if
you do not perform any operation for about two or
three minutes.
For details about city codes, see the “City Code
Table”.
To change the Home City setting, press2. Dto move the
xSecond Hand clockwise.
Keep pressingDuntil the xSecond Hand is pointing
at the city code you want to select as your Home City.
Each time you select a city code, thezHour Hand,
cMinute Hand, vUpper Left Dial Hand and mDay
move to the current time and date for that city code.
Do not perform the next operation until these hands
stop moving.
Press3. Bto toggle the time for the currently selected city code between STD
(standard time)/DST (daylight saving time).
In the city code setting mode, thenRight Dial Hand indicates the current
daylight saving time setting as STD (standard time) or DST (daylight saving
time).
Note that you cannot switch betweenSTD (standard time)/DST (daylight saving
time) while UTC is selected as your Home City.
After all the settings are the way you want, press4. Ato return to the Timekeeping
Mode.
To toggle the Home City time between standard time and daylight saving time
Perform the step 1 under “To configure Home City settings”.1.
Each time you select a city code, thezHour Hand, cMinute Hand, and
vUpper Left Dial Hand move to the current time for that city code. Do not
perform the next operation until these hands stop moving.
Press2. Bto toggle the time for the city code of the currently selected Home City
between STD (standard time)/DST (daylight saving time).
In the city code setting mode, thevRight Dial Hand indicates the current
daylight saving time setting as STD (standard time) or DST (daylight saving
time).
Note that you cannot switch betweenSTD (standard time)/DST (daylight saving
time) while UTC is selected as your Home City.
After the setting is the way you want, press3. Ato return to the Timekeeping Mode.
Note
After you specify a city code, the watch will use UTC* offsets in the World Time
Mode to calculate the current time for other time zones based on the current time
in your Home City.
Selecting some city codes makes it possible for the watch to receive the time
calibration signal for the corresponding area automatically.
Coordinated Universal Time, the world-wide scientific standard of timekeeping. The*
reference point for UTC is Greenwich, England.

B +@
* 6> 5

@

B +
@6> 5
Configuring Current Time and Date Settings Manually
You can configure current time and date settings manually when the watch is unable
to receive a time calibration signal.
To change the current time setting manually
In the Timekeeping Mode, keep1. Adepressed (for about
five seconds) as the xSecond Hand goes through the
following sequence.
Moves toYES (or Yfor some models) or NO (N)
to indicate the last signal reception result, then to
READY (R), and then to the city code of the currently
selected Home City.
At this time, thenRight Dial Hand will indicate the
Home City’s current daylight saving time setting (STD
or DST).
Change the Home City and daylight saving time (DST)2.
settings, if you want.
For details about these settings, see steps 2 and 3
under “To configure Home City settings”.
In the following steps, each press ofCcycles
between settings as shown below.
Home city/DST Hour/Minute Year
(tens)
Day Month
Year
(ones)
Press3. C.
The watch will beep, and thexSecond Hand and nRight Dial Hand will move
to their 12 o’clock positions. This is the time setting mode.
Use4. D(+) and B(–) to change the time (hour and minute) setting.
Each press of either button will move the hands (zHour Hand and cMinute
Hand) one minute.
Holding downDor Bwill start high-speed zHour Hand and cMinute Hand
movement in the applicable direction. To stop high-speed hand movement,
press any button.
ThevUpper Left Dial Hand and zHour Hand move in sync with each other.
When setting the time, make sure that thevUpper Left Dial Hand indicates the
proper a.m./p.m. hour.
If you want to change the date setting at this time, pressCand perform the
procedure starting from step 3 under “To change the current date setting
manually”.
After the time setting is the way you want, press5. Ato return to the Timekeeping
Mode.
This will cause thexSecond Hand to move automatically to 12 o’clock and
resume movement from there.
To change the current date setting manually
@
00
50
10
40
30
90
60
80
70
Setting the year (tens digit)
20
In the Timekeeping Mode, keep1. Adepressed (for
about five seconds) as the xSecond Hand goes
through the following sequence.
Moves toYES (or Yfor some models) or NO (N)
to indicate the last signal reception result, then
to READY (R), and then to the city code of the
currently selected Home City.
Press2. Ctwice.
The watch will beep and change to the year
setting mode.
The year can be set in the range of 2000 to
2099.
Use3. Dto change the tens digit of the year setting.
Each press ofDwill move the xSecond Hand
and change the tens digit of the year setting.
After the tens digit of the year setting is the way4.
you want, press C.
The watch will beep and change to the ones
digit of the year setting mode.
Use5. Dto move the xSecond Hand to the ones
digit of the year setting you want.
Each press ofDwill move the xSecond Hand
and change the ones digit of the year setting.
After the year setting is the way you want, press6.
C.
The watch will beep and change to the month
setting mode.
Use7. Dto move the xSecond Hand to the
month setting you want.
After the month setting is the way you want,8.
press C.
The watch will beep and change to the day
setting mode.

@ 6

6>
B +@
Setting the year (ones digit)
@
01
2
3
4
657
9
8
Setting the month
@
Dec
Jan
Feb
Mar
Apr
Jun
May
Nov
Jul
Oct
Sep
Aug

4
Operation Guide 5088
Use9. D(+) and B(–) to change the mDay setting.
If you want to change the time setting at this time,
press Cand then perform the procedure starting
from step 3 under “To change the current time setting
manually”.
After the settings are the way you want, press
10. Ato
return to the Timekeeping Mode.
This will cause thexSecond Hand to move
automatically to 12 o’clock and resume movement
from there.
The day of the week indicated by thenRight Dial
Hand changes automatically in accordance with the
date (year, month, and day).
Note
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 rechargeable battery replaced or after
power drops to Level 3.
Using the Stopwatch
The stopwatch measures elapsed time and split times.
Hand Functions
x Second Hand: Indicates the stopwatch 1/10-second
count.
b Lower Left Dial Hands: Indicate the stopwatch minutes
and seconds.
n Right Dial Hand: Indicates the stopwatch 1/100-second
count.
To perform elapsed time measurement
Use1. Cto move the nRight Dial Hand to 0.
Now you can perform either of following stopwatch2.
operations.
To perform an elapsed time operation
B B BBD
Start Stop (Restart) (Stop) Reset
To pause at a split time
BDNormal stopwatch hand movement will
resume automatically after five seconds.
BD
Start Split Stop Reset
Note
The Stopwatch Mode can indicate elapsed time up to 23 minutes, 59.99 seconds.
Dbutton operation (split, reset) is disabled while hands are moving at high speed
following a reset operation and when transitioning from a split time back to normal
elapsed timekeeping.
Once started, stopwatch timing continues until you pressBto stop it, even if you
exit the Stopwatch Mode to another mode and even if timing reaches the stopwatch
limit defined above.
ThexSecond Hand indicates the 1/10-second count for the first 30 seconds of a
stopwatch elapsed time operation. After that, the hand stops at 12 o’clock.
1/10-second timing continues internally after the first 30 seconds, and the
xSecond Hand will jump to the current value whenever B(Stop) or D(Split) is
pressed.
Though thenRight Dial Hand is stopped while an elapsed time measurement
operation is in progress, the watch keeps track of the 1/100-second count
internally. The nRight Dial Hand will jump to the current 1/100-second reading
whenever you stop the stopwatch or perform a split time operation.
Checking the Current Time in a Different Time Zone
You can use the World Time Mode to view the current time in one of 29 time zones
around the globe. The city that is currently selected in the World Time Mode is called
the “World Time City”.
Hand Functions
x Second Hand:
Indicates the currently selected World Time City.
b Lower Left Dial Hands:
Indicate the current time in the selected World Time
City in 24-hour format.
n Right Dial Hand:
Indicates the current STD (standard time) or DST
(daylight saving time) setting of the currently selected
time zone.
To view the time in another time zone
Use1. Cto move the nRight Dial Hand to STD or DST.
ThexSecond Hand will move to the city code of the currently selected World
Time City.
Use2. Dto move the xSecond Hand to the city code you want to select as the
World Time City.
ThebLower Left Dial Hands will move to the current time in the time zone of
the current city code. At this time, the zHour Hand and cMinute Hand will
continue to indicate the current time in the Home City.
For full information on city codes, see the “City Code Table”.
If you think that the time indicated for the selected time zone is not correct, it
probably means that there is something wrong with your Home City settings.
Use the procedure under “To configure Home City settings” to correct the Home
City settings.

5
@
6

@
* 6

@
* 6
To specify standard time or daylight saving time (DST) for a city

* 6
Hold down
Afor two
seconds
In the World Time Mode, use1. Dto select the city code
whose setting you want to change.
Wait until thebLower Left Dial Hands complete their
move to the time in the currently selected World Time
City. You will not be able to perform step 2 of this
procedure until the hands stop moving.
Hold down2. Afor about two seconds until the watch
beeps. This will cause the nRight Dial Hand to toggle
between DST (daylight saving time) and STD (standard
time).
Note that you cannot switch betweenSTD (standard
time)/DST (daylight saving time) while UTC is
selected as the World Time City.
Note that theSTD (standard time)/DST (daylight
saving time) setting affects only the currently
selected city code. Other city codes are not affected.
Swapping your Home City and World Time City
You can use the procedure below to swap your Home City and World Time City. This
capability can come in handy when you frequently travel between two locations in
different time zones.
The following example shows what happens when the
Home City and World Time City are swapped while the
Home City originally is TYO (Tokyo) and the World Time
City is NYC (New York).
Home City World Time City
Before
swapping
Tokyo
10:08 p.m.
(Standard time)
New York
9:08 a.m.
(Daylight saving time)
After
swapping
New York
9:08 a.m.
(Daylight saving time)
Tokyo
10:08 p.m.
(Standard time)
To swap your Home City and World Time City
In the World Time Mode, use1. Dto select the World
Time City you want.
In this example, you would move thexSecond Hand
to NYC in order to select New York as the World
Time City.
Wait until thebLower Left Dial Hands complete their
move to the time in the currently selected World Time
City. You will not be able to perform step 2 of this
procedure until the hands stop moving.
Hold down2. Bfor about three seconds until the watch
beeps.
This will make the World Time City (NYC in this example) your new Home City.
At the same time, it will change the Home City you had selected prior to step 2
(TYO in this example), to your World Time City.
After swapping the Home City and World Time City, the watch will stay in the
World Time Mode. The xSecond Hand will point to your new World Time City
(TYO in this example).
ThebLower Left Dial Hands will indicate the current time in your new World
Time City.
Note
If your current World Time City supports time calibration signal reception, making it
your Home City enables calibration signal reception for that city.
Using the Alarm
When the alarm is turned on, an alarm will sound for about 10 seconds each day
when the time in the Timekeeping Mode reaches the preset alarm time. This is true
even if the watch is not in the Timekeeping Mode.
Hand Functions
x Second Hand:
Indicates the current alarm ON/OFF setting.
b Lower Left Dial Hands:
Indicate the current alarm time setting in 24-hour
format.
n Right Dial Hand: Points to AL.
To change the alarm time setting
Use1. Cto move the nRight Dial Hand to AL.
Use2. D(+) and B(–) to change the alarm time setting.
Each press of either button will move thebLower Left Dial Hands one minute.
Holding downDor Bwill start high-speed hand movement in the applicable
direction. To stop high-speed hand movement, press any button.
The alarm always works based on the time kept in the Timekeeping Mode.
The watch will return to the Timekeeping Mode automatically if you do not
perform any operation in the Alarm Mode for about two or three minutes.
To turn the alarm on or off
In the Alarm Mode, press Ato toggle the alarm on and off. The xSecond Hand will
indicate the current ON/OFF setting.
To stop the alarm
Press any button.

@

@
*

@
* 6

5
Operation Guide 5088
Auto Correction of Hand Home Positions
Strong magnetism or impact can cause the hands and/or day setting to be off, even
if the watch is able to perform the signal receive operation. Auto correction of hand
home positions correct the hand position automatically.
Auto correction is performed in the Timekeeping Mode only.
Auto correction corrects the positions of thezHour Hand, cMinute Hand, and
xSecond Hand. For the dial hands and day, you must perform the manual
adjustment procedure under “Adjusting the Home Positions Manually”.
Each hour, the watch performs automatic correction of the hand positions from –55
minutes to +5 minutes.
You also can trigger auto correction of hand home positions manually, if you want.
See “To trigger auto correction of hand home positions” for more information.
Auto correction of hand home positions can take up to three and a half minutes to
complete.
If hand positions are off by one hour or more, correct them using the procedure
under “To trigger auto correction of hand home positions” or “Adjusting the Home
Positions Manually”.
To trigger auto correction of hand home positions
Perform the following procedure when the time setting
is off.
In the Timekeeping Mode, hold down Dfor about six
seconds until the xSecond Hand completes one full
revolution.
Though thexSecond Hand will stop momentarily about
three seconds after you hold down D, do not release
the button yet. Wait until the xSecond Hand completes
a full revolution before you release D.
To interrupt an ongoing correction operation and return
to the Timekeeping Mode, press Dagain.
If you releaseDwhen the xSecond Hand stops the first time (after about three
seconds) in the above operation, the watch will enter the home position adjustment
mode, which is described under “Adjusting the Home Positions Manually”. If this
happens, press Ato return to the Timekeeping Mode and then perform the above
operation again.
Manually triggered auto correction of hand home positions performs the following
two steps.
The hands will move automatically in order to determine the home positions of the1.
watch.
After the hand home positions are determined, the watch will return to normal2.
timekeeping automatically. This completes the correction operation.
Adjusting the Home Positions Manually
Strong magnetism or impact can cause the hands and/or date of the watch to be
off, even if the watch is able to perform the signal receive operation. If this happens,
perform the applicable home position adjustment procedures in this section.
Hand home position adjustment is not required if the time and day settings are
correct.
You also can use auto correction of the hand home positions to correct the home
positions of the zHour Hand, cMinute Hand, and xSecond Hand.
Note
Any time after you enter the home position adjustment mode in step 1 of the following
procedure, you can return to the Timekeeping Mode by pressing A. The watch also
will return to the Timekeeping Mode automatically if you do not perform any operation
for about two or three minutes in home position adjustment mode. In either case, any
adjustments you made before the watch returned to the Timekeeping Mode will be
applied.
To adjust the home positions
Hold down1. Cfor about two seconds until the watch beeps twice and enters the
Timekeeping Mode.
Hold down2. Dfor about three seconds until the watch beeps.
The watch is now in the home position adjustment
mode.
The watch will exit the adjustment mode automatically
if you do not perform any operation for about two or
three minutes.
First isxSecond Hand home position adjustment.
If thexSecond Hand moves to 12 o’clock, it is in the
correct home position. If it doesn’t, use Dto move it
to 12 o’clock.
Each press ofCin the home position adjustment
mode will cycle through the adjustment settings as
shown below.
xSecond zHour/ cMinute/ v24-hour bLower Left Dial Hands
nRight Dial HandmDay
After confirming that the3. xSecond Hand is at the proper home position, press C.
This will switch to zHour Hand and cMinute Hand home position adjustment.
ThezHour Hand and cMinute Hand are at their proper home positions if
they both move to 12 o’clock. The vUpper Left Dial Hand also will move along
with zHour Hand movement, and cannot be adjusted individually. If the hands
are not positioned correctly, use D(+) and B(–) to move them to their proper
home positions.
After confirming that the4. zHour Hand and cMinute
Hand are in their correct home positions, press C. This
will switch to bLower Left Dial Hands home positions
adjustment.
ThebLower Left Dial Hands are at their proper home
positions if they both move to 12 o’clock. If the hands
are not positioned correctly, use D(+) and B(–) to
move them to 12 o’clock.


@

@

B +
*>
After confirming that the5. bLower Left Dial Hands are in
the correct home positions, press C. This will advance
to nRight Dial Hand home position adjustment.
ThenRight Dial Hand is in the correct home position
if it is pointing at 12 o’clock. If it isn’t, use D(+) and
B(–) to move it to 12 o’clock.
After confirming that the6. nRight Dial Hand is in the
correct home position, press C. This will advance to
day home position adjustment.
ThemDay is in the correct home position if it
shows 1. If it doesn’t, use D(+) and B(–) to change
the day to 1.
Press7. Ato return to the Timekeeping Mode.
ThemDay moves to the current day, and then the zHour Hand and the
cMinute Hand move to the current time. Wait until everything stops moving.
Troubleshooting
Hand Movement and Position
■ I lost track of what mode the watch is in.
Refer to “To select a mode”. To return directly to the Timekeeping Mode from any
other mode, hold down Cfor about two seconds.
■ The xSecond Hand is moving at two-second intervals.
■ All the watch’s hands are stopped at 12 o’clock and none of the buttons work.
Power may be low. Expose the watch to light until the xSecond Hand starts moving
normally, at one-second intervals.
■ The hands of the watch suddenly start moving at high speed, even when I do
not perform any operation.
This could be due to any one of the following causes. In all cases, the hand movement
does not indicate malfunction, and should stop shortly.
The watch is recovering from a sleep state.
The time setting is being adjusted following a successful auto time calibration
signal receive operation.
The watch is returning to the Timekeeping Mode automatically from the Alarm
Mode.
■ Hands suddenly stop moving. Button operation also is disabled.
The watch may be in the power recovery mode. Do not perform any operation until the
hands return to their normal positions (in about 15 minutes). The hands should return
to their correct positions when normal operation returns. To help power recover, leave
the watch in a location where it is exposed to light.
■ The current time setting is off by hours.
Your Home City setting may be wrong. Check your Home City setting and correct it,
if necessary.
■ The current time setting is off by one hour.
If you are using the watch in an area where time calibration signal reception is
possible, see “To configure Home City settings”.
If you are using in the watch in an area where time calibration signal reception is
not possible, you may need to change your Home City’s STD (standard time)/DST
(daylight saving time) setting manually. Use the procedure under “To toggle the Home
City time between standard time and daylight saving time” to change the STD/DST
setting.
■ The hands and/or day indications are off.
This could indicate that the watch has been exposed to magnetism or strong impact,
which has caused problems with proper hand and day alignment. Adjust the watch’s
hand and day home position alignment.
World Time Mode
■ The World Time indicated by the bLower Left Dial Hands in the World Time
Mode is one hour off from the actual time in the selected time zone.
The STD (standard time)/DST (daylight saving time) setting of the selected World
Time City may be wrong. Select the correct STD (standard time)/DST (daylight saving
time) setting.
■ The World Time indicated by the bLower Left Dial Hands in the World Time
Mode is off.
Your Home City setting may be wrong. Check your Home City setting and correct it,
if necessary.
Charging
■ The watch does not resume operation after I expose it to light.
This can happen after the power level drops to Level 3. Continue exposing the watch
to light until the xSecond Hand starts moving normally (at one-second intervals).
■ The xSecond Hand starts to move at one-second intervals, but then suddenly
returns to moving at two-second intervals.
The watch probably is not sufficiently charged yet. Continue keeping it exposed to
light.
Time Calibration Signal
The information in this section applies only when LON, PAR, ATH, HNL, ANC, LAX,
DEN, CHI, NYC, HKG, or TYO is selected at the Home City. You need to adjust the
current time manually when any other city is selected as the Home City.
■ The xSecond Hand indicates NO (N) when I check the result of the latest
receive operation.
Possible Cause Remedy
You are wearing or moving the watch, or
performing a button operation during the
signal receive operation.
The watch is in an area with poor reception
conditions.
Keep the watch in an area where reception
conditions are good while the signal receive
operation is being performed.
You are in an area where signal reception is
not possible for some reason. See “Approximate Reception Ranges”.
The calibration signal is not being transmitted
for some reason.
Check the website of the organization that
maintains the time calibration signal in your
area for information about its down times.
Try again later.

* 6 5

6
Operation Guide 5088
■ The current time setting changes after I set it manually.
You may have the watch configured for Auto Receive of the time calibration signal,
which will cause the time to be adjusted automatically according to your currently
selected Home City. If this results in the wrong time setting, check your Home City
setting and correct it, if necessary.
■ The current time setting is off by one hour.
Possible Cause Remedy
Signal reception on a day for switching
between STD (standard time)/DST (daylight
saving time) may have failed for some
reason.
Perform the operation under “To get ready
for a receive operation”. The time setting will
be adjusted automatically as soon as signal
reception is successful.
If you are unable to receive the time
calibration signal, change the STD (standard
time)/DST (daylight saving time) setting
manually.
■ Auto Receive is not performed or I cannot perform Manual Receive.
Possible Cause Remedy
The watch is in the Stopwatch Mode.
Auto Receive is not performed while the
watch is in the Stopwatch Mode. Hold
down Cfor about two seconds to enter the
Timekeeping Mode.
Your Home City setting is wrong. Check your Home City setting and correct it,
if necessary.
There is not enough power for signal
reception. Expose the watch to light to charge it.
■ Signal reception is being performed successfully, but the time and/or day is
wrong.
Possible Cause Remedy
Your Home City setting is wrong. Check your Home City setting and correct it,
if necessary.
The watch may have been exposed to
magnetism or strong impact, which has
caused problems with proper hand and day
alignment.
Adjust the watch’s hand and day home
positions.
Specifications
Accuracy at normal temperature: ±15 seconds a month (with no signal calibration)
Timekeeping: Hour, minutes (hand moves every 10 seconds), seconds, 24-hour,
day, day of the week
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: Home City code (can be assigned one of 29 city codes and Coordinated
Universal Time); Daylight Saving Time (summer time) / Standard Time
Time Calibration Signal Reception: Auto receive up to six times a day (5 times a
day for the Chinese calibration signal; Remaining auto receives
cancelled as soon as one is successful); Manual receive
Receivable Time Calibration Signals:
Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5 kHz);
Anthorn, England (Call Sign: MSF, Frequency: 60.0 kHz); Fukushima,
Japan (Call Sign: JJY, Frequency: 40.0 kHz); Fukuoka/Saga, Japan
(Call Sign: JJY, Frequency: 60.0 kHz); Fort Collins, Colorado, the
United States (Call Sign: WWVB, Frequency: 60.0 kHz); Shangqiu City,
Henan Province, China (Call Sign: BPC, Frequency: 68.5 kHz)
Stopwatch: Measuring capacity: 23'59.99"
Measuring unit: 1/100 second
Measuring mode: Elapsed time, split time
World Time: 29 cities (29 time zones) and Coordinated Universal Time
Other: Standard Time/Daylight Saving Time (summer time); Home City/World Time
City swapping
Alarm: Daily alarm
Other: Power Saving
Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 5 months (no exposure to light after a
full charge; 10 seconds alarm beeper operation and one signal reception of
approximately 4 minutes per day)
City Code Table
City
Code City UTC Offset/ GMT Differential
PPG Pago Pago –11
HNL Honolulu –10
ANC Anchorage –9
LAX Los Angeles –8
DEN Denver –7
CHI Chicago –6
NYC New York –5
SCL Santiago –4
RIO Rio De Janeiro –3
FEN
Fernando de Noronha –2
RAI Praia –1
UTC 0
LON London
PAR Paris +1
ATH Athens +2
City
Code City UTC Offset/ GMT Differential
JED Jeddah +3
THR Tehran +3.5
DXB Dubai +4
KBL Kabul +4.5
KHI Karachi +5
DEL Delhi +5.5
DAC Dhaka +6
RGN Yangon +6.5
BKK Bangkok +7
HKG Hong Kong +8
TYO Tokyo +9
ADL Adelaide +9.5
SYD Sydney +10
NOU Noumea +11
WLG Wellington +12
Based on data as of June 2009.
The rules governing global times (UTC offset and GMT differential) and summer
time are determined by each individual country.