Casio MO0602 User Manual

2

• The time calibration signal the watch will attempt to pick up depends on its current

Home City code setting as shown below.

60.0 kHz

40.0 kHz

60.0 kHz

Fort Collins, Colorado
(the United States)

Fukushima (Japan)

Fukuoka/Saga (Japan)

Fort Collins

2,000 miles
(3,000 kilometers)

600 miles
(1,000 kilometers)

1,000
kilometers

1,000
kilometers

Fukuoka/Saga

500
kilometers

Fukushima

500
kilometers

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

(the United States) transmitter, signal reception may not be possible during certain
times of year or times of day. Radio interferance may also cause problems with
reception.

• At distances further than about 500 kilometers (310 miles) from the Fukushima and

Fukuoka/ Saga (Japan) transmitter, signal reception may not be possible during
certain times of year or times of day. Radio interferance may also cause problems
with reception.

• Even when the watch is within the reception range of the transmitter, signal

reception will be 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.

• See the information under “Signal Reception Troubleshooting” if you experience

problems with time calibration signal reception.

About Auto Receive
The watch receives the time calibration signal automatically up to six times a day.
When any auto receive is successful, the remaining auto receive operations are not
performed.  The reception schedule (calibration times) depends on your currently
selected Home City, and whether standard time or Daylight Saving Time is selected
for your Home City.

Midnight 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am

Midnight 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am

Daylight Saving Time

• The display of the watch is blank while an auto receive operation is in progress.

• Auto receive 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

seven minutes everyday when the time in the Timekeeping Mode reaches each of the
six calibration times. Do not perform any button operation within seven minutes before
or after any of the six calibration times. Doing so can interfere with correct calibration.

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

digital display. Reception will be performed whenever the display shows one of the
six calibration times, regardless of whether or not the displayed time is actually the
correct time.

• Calibration signal reception is disabled while a countdown timer operation is in progress.

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.

3. After you release D the display will show the letters

. This indicates that signal reception is in progress.

• Time calibration signal reception normally takes from two to seven 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.

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

• If reception is unsuccessful, the message 

ERR

 appears on the display for one or

two minutes. After that, the watch returns to the Timekeeping Mode.

• You can also change from the last signal or 

ERR

 screen to the normal timekeeping

screen by pressing D.

• Calibration signal reception is disabled while a countdown timer operation is in

progress.

About the Receiving Indicator (Manual receive)
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.

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 reception.

• The Level 3 receiving indicator remains on the display in all modes following

reception of the time calibration signal and calibration of the watch’s time setting.
The Level 3 receiving indicator is not displayed if signal reception was unsuccessful
or after manual adjustment of the current time setting.

• The Level 3 receiving indicator indicates that at least one of the six calibration signal

receive operations was successful. Note, however, that the Level 3 receiving
indicator is cleared from the display at 0:00 a.m. each day.

1. In the Timekeeping Mode, press C to display the last

signal screen.

• The watch will automatically return to the Timekeeping

Mode if you do not perform any button operation for one
or two minutes after displaying the last signal screen.

2. Hold down A until the current auto receive setting

flashes on the display. This is the setting screen.

• If the auto receive setting does not appear when you

hold down A, it means that the city code currently
selected for the Home City is for an area that does not
support calibration signal reception. You cannot turn
auto receive on or off in this case.

3. Use D to turn auto receive on (

ON

) or off (

OFF

).

4. Press A to exit the setting screen.

• To return to the Timekeeping Mode from the last signal screen, press D.

• For information about city codes that support signal reception, see “To set your

Home City”.

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On/Off status

Cannot perform
manual receive.

• The watch is not in the Timekeeping

Mode.

• Your current Home City is not one of the

following city codes: 

ANC

, 

YVR

,

LAX

, 

YEA

, 

DEN

, 

MEX

, 

YWG

,

CHI

, 

MIA

, 

YTO

, 

NYC

, 

YHZ

, 

YYT

,

HKG

, 

SEL

, or 

TYO.

• Enter the Timekeeping Mode

and try again.

• Select 

ANC

, 

YVR

, 

LAX

,

YEA

, 

DEN

, 

MEX

, 

YWG

,

CHI

, 

MIA

, 

YTO

, 

NYC

,

YHZ

, 

YYT

, 

HKG

, 

SEL

, or

TYO

 as your Home City.

Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal reception.

• The display of the watch is blank while an auto receive operation is in progress.

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

and  “Radio-controlled Atomic Timekeeping Precautions”.

Auto receive is
turned on, but
the Level 3
receiving
indicator does
not appear on
the display.

Time setting is
incorrect
following signal
reception.

• You changed the time setting manually.

• You were performing some button

operation during the auto receive.

• Even if reception is successful, the

Level 3 receiving indicator disappears
every day at 0 a.m.

• 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.

• Perform manual receive or

wait until the next auto signal
receive 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.

The World Time Mode digitally displays the current time in
48 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.

• The watch will perform a signal reception 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.

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

World Time Mode, which you enter by pressing C.

Current time in
selected city

City Code

To view the time in another city
While in the World Time Mode, press D to scroll through the city codes (time zones)
to the east.

• For full information on city codes, see “City Code Table”.

1. In the World Time Mode, use D to display the city code

(time zone) whose Standard Time/Daylight 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).

DST indicator

• Note that you cannot use the World Time Mode to change the DST setting of the

Home City code you currently have selected in the Timekeeping Mode. See “To
change the Daylight Saving Time (summer time) setting” for information about
turning the Home City code DST setting on and off.

• The DST indicator will appear 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 currently displayed city

code. Other city codes are not affected.