Citizen J304 User manual
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English
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CONTENTS
1 . Features .....................................................................................3
2 . Before Using...............................................................................3
3 . Names of Components...............................................................4
4 . Setting the Time..........................................................................5
5 . Setting the Date..........................................................................6
6 . Using the Dual Time Function.....................................................7
7 . Special Functions of Solar-Powered Watches ............................8
8 . Charging Time ..........................................................................10
9 . Notes Regarding Handling of Solar-Powered Watches.............11
10. Helpful Hints.............................................................................13
11. Precautionary Items and Usage Limitations .............................14
12. Specifications ........................................................................... 21
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1. Features
This is an analog solar-powered watch that is equipped with a solar cell incorporated in its face
to convert solar energy into electricity. The watch is also equipped with the large and highly
visible date indicator and the fan-shape 24-hour dial.
2. Before Using
Sufficiently Recharge by
Placing in Light Before Use
A secondary battery is used in this watch to store electrical energy. This secondary battery
is a clean energy battery that does not contain mercury or other toxic substances. Once fully
charged, the watch will continue to run for about 6 months without additional charging.
<How to use this Solar Watch Properly>
To use this watch comfortably, make sure to recharge the watch before it stops running
completely. Since there is no risk of overcharging (Overcharging Prevention Feature), it is
recommended that the watch be recharged everyday.
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3. Names of Components
* In the case the crown is of the screw-lock type, loosen the screw by turning the crown to the
left before operating the crown, and after having returned the crown to the normal position
following operation, turn the crown to the right while pushing it in to securely retighten it.
* The illustrations in this instruction manual may differ from the actual appearance of your watch.
Date
Hour hand
Minute hand
Second hand Crown
24-hour hand
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4. Setting the Time
* For accurate setting of the time
• Set in the time order of second hand,hour hand,minute hand,24-hour hand.
(1) Pull the crown out to position 2 when the second hand reaches the 60-second position.
(2) Turn the crown to set the time.
The date changes when the time is about 2:00 AM. Do not confuse AM and PM when setting
the time.
(3) Securely return the crown to the normal position in synchronization with a telephone or other
time service.The second hand will start moving and the watch will begin to keep accurate time.
(4) Pull the crown out to position 1 and turn it to the left to set 24-hour time. (Turn to the right to
set the date.)
(5) Return the crown to the normal position.
• For more accurate setting of the time, turn the minute hand 4-5 minutes past the correct time,
then turn it back to the correct time.
Hour hand
Minute hand
Second hand
24-hour hand
Pull the crown out to
position 1 (Turn to the left)
Pull the crown out to
position 2
24-hour time correction
Time correction
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5. Setting the Date
(1) Pull the crown out to position 1.
(2) Turn the crown to the right to set the date. (Turning the crown to the left enables correction of
the 24-hour hand.)
(3) When the date was set, return the crown to the normal position.
[Notes]
• If the date is set while the time on the watch is between the hours of about 11:00 PM and
2:00 AM, the date may not change on the following day. If this happens, set the date after
temporarily moving the hands to a time other than between the above times.
• The date is based on a 31-day calendar. The crown must be used to change the date from the
last day of the month to the first day of the following month for shorter months (months having
30 days and February).
Pull the crown out
to position 1
(Turn to the right)
Date correction
Date
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6. Using the Dual Time Function
The 24-hour hand enables the setting of the time for another time zone.The 24-hour time
setting can be made in 1-hour increments to enable use of the dual time function.
(1) Pull the crown out to position 1.
(2) Turn the crown to the left to set the 24-hour hand to a time in another time zone.
(Turning the crown to the right enables correction of the date.)
(3) When the setting was completed, return the crown to its normal position.
• The minute display position of the 24-hour hand stops at a position that is linked to the
minute hand.
• Please use the dual time function as a general reference only.
24-hour hand
Pull the crown out to
position 1 (Turn to the left)
24-hour time correction
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7. Special Functions of Solar-Powered Watches
This watch is provided with a function that causes a warning function to be activated when the
watch is sufficiently charged that alters the display to inform the wearer of insufficient charge.
When the watch is exposed to light,the Quick Start Function will begin operating and the
second hand will start moving. The correct time can be set once the watch is fully charged.
If insufficiently chargeed state (2-second interval
movement) continues for 3 days or more
[Insufficient recharging
warning feature display]
[Normal time display]
If insufficiently charged
If charged sufficiently
Stops
One second
interval movement
Two second
interval movement If insufficiently charged
and time is set
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<Insufficient Recharging Warning Feature>
The second hand changes to two-second interval movement to inform the wearer of insufficient
recharging. Although the watch will keep the correct time when this happens, the watch will
stop when two-second interval movement continues for about 3 days. Place the watch in light to
recharge. The watch will return to one-second interval movement.
<Quick Start Feature>
The watch will stop when it is completely discharged. When placed in light, the hand will begin
to move after about 10 seconds. (The time until the hands begin to move varies according to
the model and brightness of the light.) Please note that if the light is blocked, the watch may
stop again as a result of being insufficiently recharged.
<Overcharging Prevention Feature>
When the secondary battery is fully charged, the overcharging prevention feature is activated
to prevent further recharging.This enables the wearer to recharge without risk of damage to
the watch.
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8. Charging Time
The time required for charging varies according to the model of watch (color of the watch face, etc.).
The following table provides a general reference for determining charging times.
Illuminance
(lx) Environment
Time required when charging continuously
After stopping until one-
second movement
For one
day’s use
For full
charge
500 Interior lamp 70 hours 4 hours
1,000
60-70cm away from
fluorescent desk lamp (30W)
35 hours 2 hours
3,000
20cm away from
fluorescent desk lamp (30W)
10 min. 40 min 130
hours
10,000
Outside, cloudy condition
3 min. 12 min
40 hours
100,000
Outside, sunny condition
25 min. 3 min 8 hours
Time required for full charge: Time from the state in which the watch has stopped until fully charged.
Time required for one day’s use: Time required for the watch to run at one-second intervals for one day.
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