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