Casio 4390 User manual

Module No. 4390
MO0901-EA

Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully.
•Be sure to keep all user documentation handy for future reference.
••
••
•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.
E

E-1
l
l
l
l
l
l
l
l
l
l
l
Bright light
Solar cell
Keep the watch exposed to bright light
The electricity generated by the solar cell of the watch is
stored by a built-in battery. Leaving or using the watch
where it is not exposed to light causes the battery to run
down. Make sure the watch is exposed to light as much as
possible.
•When you are not wearing the watch on your wrist,
position the face so it is pointed at a source of bright
light.
•You should try to keep the watch outside of your sleeve
as much as possible. Even if the face of the watch is
blocked only partially from light, charging will be reduced
significantly.

E-2
Bright light
Electrical
energy
All
functions
enabled.
LEVEL 1
LEVEL 2
Charge
Solar cell
(Converts light to
electrical power.)
Rechargeable battery
LEVEL 1
LEVEL 2
Some
functions
disabled.
Dis-
charge
•The watch continues to operate, even when it is not exposed to light. Leaving the
watch in the dark can cause the battery to run down, which will result in some watch
functions to be disabled. If the battery goes dead, you will have to re-configure watch
settings after recharging. To ensure normal watch operation, be sure to keep it
exposed to light as much as possible.
Battery charges in the light. Battery discharges in the dark.

E-3
•The actual level at which some functions are disabled depends on the watch model.
•Be sure to read “Power Supply”(page E-47) for important information you
need to know when exposing the watch to bright light.
If the analog hands aren’t moving...
If the analog hands aren’t moving, it means that the power saving mode has stopped
them to save battery power.
•See “Power Saving”(page E-56) for more information.
•The hands also stop when the watch’s battery runs down.
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.

E-4
About This Manual
•Button operations are indicated using the letters shown
in the illustration.
•Each section of this manual provides you with the
information you need in order to perform operations in
each mode. Further details and technical information
can be found in the “Reference”section.
•To ensure that this watch provides you with the years of
service for which it is designed, be sure to carefully read
and follow the instructions under “Operating
Precautions”and “User Maintenance”.
30
Minute hand
Day
Hour hand
Second hand

E-5
Contents
General Guide ......................................................................................................... E-8
Radio-controlled Atomic Timekeeping ............................................................... E-11
World Time ............................................................................................................. E-33
Configuring Time and Date Settings Manually ................................................... E-37
Auto Hand Home Position Correction ................................................................. E-41
Manual Home Position Correction ...................................................................... E-44
Power Supply ........................................................................................................ E-47
Reference .............................................................................................................. E-53
Specifications ....................................................................................................... E-58
Operating Precautions ......................................................................................... E-60
User Maintenance ................................................................................................. E-68

E-6
Procedure Lookup
The following is a handy reference list of all the operational procedures contained in
this manual.
To specify your Home City ................................................................................... E-12
To check the current Home City STD/DST setting ............................................. E-14
To perform manual receive .................................................................................. E-28
To check the latest signal reception results ...................................................... E-30
To search for a city ............................................................................................... E-34
To check whether a time zone time is AM or PM ............................................... E-34
To change the STD/DST setting of a particular city code ................................. E-35
To check the STD/DST setting for a World Time Mode city ............................... E-36

E-7
To trigger the auto hand home position correction operation manually ......... E-42
To recover from the sleep state ........................................................................... E-57

E-8
30
30
30
30
Timekeeping
Mode
Receive Status
Check (page E-30)
Manual Receive
(page E-28)
Setting Mode
(pages E-12, E-44)
▲
▲
Press A.
▲
▲
▲
▲
Hold down Afor about two seconds.
Press any button.
Hold down Afor about five seconds.
Press A.
General Guide

E-9
•Press Cto change the mode.
•Except while the watch is performing auto hand home position correction, holding
down Cfor about two seconds will return directly to the Timekeeping Mode.

E-10
Timekeeping Mode
30
World Time Mode
(page E-33)
30
Minute hand
Day
Hour hand
Second hand
Press C.
▲
▲
Timekeeping Mode Operations
•To check the current Home City setting
by pressing D(page E-12)
•To check the latest signal reception results
by pressing A(page E-30)

E-11
Radio-controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly.
•
Supported time calibration signals: Germany (Mainflingen), England (Anthorn), United
States (Fort Collins), China (Shangqiu), and Japan (Fukushima or Fukuoka/Saga)
•See the information under “Signal Reception Troubleshooting”(page E-31) if you
experience problems with time calibration signal reception.
Current Time Setting
This watch adjusts its time setting automatically in accordance with a time calibration
signal. You also can perform a manual procedure to set the time and date, when
necessary.
•The first thing you should do after purchasing this watch is to specify your
Home City, which is the city where you normally will use the watch. For more
information, see “To specify your Home City”on page E-12.
•When using the watch outside the areas covered by the time signal transmitters, you
will have to adjust the current time setting manually as required. See
“Configuring
Time and Date Settings Manually”(page E-37) for more information about manual
time settings.

E-12
To specify your Home City
1. Press Cto enter the World Time Mode.
2. Use Dto move the second hand clockwise to the city
code you want to use as your Home City.
•Note that it can take as long as one minute for the
hands to move to the applicable time.
•All operations except for the following are disabled
while the watch’s hands are moving to the current
time for a newly selected city code.
D: City selection
C: Timekeeping Mode
•For information about the Home City, see “Home City
Codes and Transmitters”(page E-14). The watch will
receive the time calibration signal of the transmitter of
the selected city code.
30
Second hand
City code

E-13
3. Hold down Afor about two seconds to toggle the current Home City between
standard time (STD) and daylight saving time (DST).
•See “To change the STD/DST setting of a particular city code”(page E-35) for
details.
4. After the settings are the way you want, hold down Bfor about three seconds until
the watch returns to the Timekeeping Mode.
•As you hold down B, the second hand will move to either AM or PM, and then the
watch will enter the Timekeeping Mode.
•Normally, your watch should show the correct time as soon as you specify your
Home City code. If it does not, it should adjust automatically after the next auto
receive operation. You also can perform manual receive (page E-28) or you can set
the time manually (page E-37).
•Even if the time calibration signal is received correctly, there are some times when
the analog hands may not indicate the correct time. If this happens, use the
procedures under “Auto Hand Home Position Correction”(page E-41) to check the
home positions of the hands, and make adjustments as required.

E-14
To check the current Home City STD/DST setting
1. In the Timekeeping Mode, press D. This will cause the second hand to move to the
current Home City setting.
2. The second hand will move to either STD (standard time) or DST (daylight saving
time) after about two seconds or if you press D.
3. The watch will return to the Timekeeping Mode after about two seconds or if you
press D.
Home City Codes and Transmitters
•The time calibration signal the watch will attempt to pick up depends on its current
Home City code setting as shown below. If you use the watch in Japan or Europe
(each of which has two different transmitter locations), it will try to receive the time
calibration signal from one of the transmitters in your current location. If it cannot
receive the signal, it will then try to receive the time calibration signal from the other
transmitter.

E-15
Home City Code
LON: London
PAR: Paris
ATH : Athens
HKG: Hong Kong
TYO: Tokyo
(HNL): Honolulu
(ANC): Anchorage
LAX: Los Angeles
DEN: Denver
CHI: Chicago
NYC: New York
Frequency
60.0 kHz
77.5 kHz
68.5 kHz
40.0 kHz
60.0 kHz
60.0 kHz
Transmitter
German/U.K. Signals
Anthorn (England)
Mainflingen (Germany)
China Signal
Shangqiu City (China)
Japan Signals
Fukushima (Japan)
Fukuoka/Saga (Japan)
U.S. Signal
Fort Collins, Colorado
(the United States)

E-16
•City codes in parentheses indicate areas where reception may be possible only
when conditions are good.
•For full information on city codes, see the “City Code Table”at the back of this
manual.
•In addition to the above, you also can select city codes that are outside the ranges of
the time calibration signal transmitters supported by this watch.
•Note that this watch does not have a city code that corresponds to Newfoundland.
•The U.S. time calibration signal can be picked up by the watch while in North
America. The term “North America”in this manual refers to the area that consists of
Canada, the continental United States, and Mexico.

E-17
Approximate Reception Ranges
2,000 miles
(3,000 kilometers)
U.K. and German Signals
Anthorn Mainflingen
1,500 kilometers
500 kilometers
The Anthorn signal is
receivable within this
area.
U.S. Signal
Fort Collins
600 miles
(1,000 kilometers)

E-18
Japan Signals
1,000 kilometers
1,000 kilometers
Fukuoka/Saga
500 kilometers
Fukushima
500 kilometers
500 kilometers
Changchun
Beijing
1,500 kilometers
China Signal
Shanghai
Hong Kong
Shangqiu
Chengdu