Citizen 8730 User manual

INSTRUCTION MANUAL

2
■Fully charge your watch before use by exposing
it to sufficient light ■
The second hand will move at 2-second intervals when the
watch is insufficiently charged. Charge your watch as
indicated in "Guide to Charging Time" (p. 22).
＊It is recommended that the watch be exposed to direct
sunlight for a long time once a month to fully charge it.

3
1. Your Watch .......................................................................................... 04
2. Operating the Crown .......................................................................... 05
3. Part Names .......................................................................................... 06
4. Setting the Time and Date .................................................................. 08
5. Adjusting the Time and Date .............................................................. 10
• Adjusting the day of week .................................................................. 10
• Adjusting the moon phase ................................................................. 10
• Adjusting the day of month and month ............................................. 12
• Setting the Time ................................................................................. 14
Solar Power
6. Solar Power Function ........................................................................ 16
7. Characteristics of the Eco-Drive Watch ......................................... 18
• Insufficient Charge Warning Function .............................................. 20
• Overcharging Prevention Function ................................................... 21
• Quick Start ......................................................................................... 21
• Guide to Charging Time ..................................................................... 22
Precautions ..................................................................................................... 24
8. Specifications...................................................................................... 30
Table of Contents

4
◎This watch includes a solar cell surrounding its face and is driven by converting
solar energy into electric energy.
Other Features
1. For the date, the numbered day of the month is indicated using a special hand,
and the month and day of the week are indicated in display windows.
2. The watch is equipped with a moon phase indicator.
1. Your Watch

5
2. Operating the Crown
There are two models available for the crown: normal and screw lock.
In the case of normal crown watch, simply pull out the crown.
<Operating the screw lock crown>
Turn to the left
1. Turn the crown to the left.
2. When the screw lock is released, the
crown pops out a little and stops in
the normal position.
3. After finishing the operation, turn the
crown to the right to lock it.

6
Second hand
Moon phase Normal position
Day of week
(English only)
Date hand
<Illustration 1>
Month
(English only)
Crown
Time adjustment position
(Time and day of week adjustment)
Date adjustment position
(Day of month and moon phase adjustment)
Month adjustment
button
The illustrations shown in this manual may differ from the actual watch you have purchased.
This manual describes the operation procedures for watch models that have a push button at the 2:00 position
and a crown at the 3:00 position.
●Use an object with a slender
tip to press the hidden push
button.
3. Part Names

7
<Illustration 2>
This manual describes the operation procedures for watch models of the illustration 1.
Second hand
Moon phase Normal position
Day of week
(English only)
Date hand
Month
(English only)
Crown
Time adjustment position
(Time and day of week adjustment)
Date adjustment position
(Day of month and moon phase adjustment)
Month adjustment
button

8
When adjusting both the time and date, it is convenient to make
settings in the order of "day of week", "moon phase", "month and day
of month", and then "time of day".
Adjusting the day of week
• Crown in position 2
• Turn the crown to the right
(The day of week begins
changing at the 12:00
position. To change to the
next day of week, make the
hour hand go around twice.)
Adjusting the
moon phase
• Crown in position 1
• Turn the crown to
the right
Adjusting the day
of month
• Crown in position 1
• Turn the crown to
the left
Temporarily set the day of
month to "30"
When the day of month
to be set is from the
31st to the 2nd
When the day
of month to be
set is from the
3rd to the 30th
Moon phase
Day of week
(English only)
Day of month Month
Crown
Position 2
Adjusting the time
and day of week
Position 1
Adjusting the day of
month and moon phase
Month adjustment button
4. Setting the Time and Date
Confirm the
day of month
to be set.

9
Adjusting the day
of month
• Crown in position 1
• Turn the crown to
the left
Adjusting the
month
• Press the month
adjustment button
Setting the time
• Crown in position 2
• Advance the minute
hand and hour hand
by turning the
crown to the right
Turn the crown to
the left to move the
hands back
Adjusting the
month
• The month changes
each time the month
adjustment button is
pressed
Adjust to the day of month
for the current day
Adjusting the day
of month
• Crown in position 1
• Turn the crown to
the left
Adjust to the day of month
for the current day
Return the
crown to the
normal position.
4. Setting the Time and Date

10
Moon phase
Day of
week
Day of month Month
Crown
Position 2
Adjusting the
time and day
of week
Position 1
Adjusting the day of
month and moon phase
Month adjustment
button
Adjusting the day of week
1. Pull out the crown to position 2 (time and day of week adjustment).
2. Turn the crown to the right (clockwise) to set the day of week for the current day.
• The day of week begins to change starting at about midnight and is finished
changing by about 5:00 a.m.
Adjusting the moon phase
1. Pull out the crown to position 1 (date
adjustment position).
2. Turn the crown to the right (clockwise)
to set the moon phase for the current
day.
Look up the moon phase for today in the
newspaper or another source and adjust
while referring to "Viewing the moon
phase".
5. Adjusting the Time and Date

11
<Viewing the moon phase>
The moon phase indicator does not display the exact shape of the moon. Use it as
a guide to estimate the moon phase.
<To Set the Moon Phase Accurately>
The moon phase can be more accurately adjusted by adjusting on the day of the new
moon (when the moon indicator is completely hidden on the moon phase, day 0) or
full moon (when the moon indicator is straight up on the moon phase, day 15).
* The indicator may differ depending on the model.
New moon
Moon phase:
Day 0
(Spring tide)
First quarter moon
Moon phase:
Approx. day 7
(Neap tide)
Full moon
Moon phase:
Approx. day 15
(Spring tide)
Last quarter
Moon phase:
Approx. day 22
(Neap tide)

12
1. Pull out the crown to position 1 (date adjustment
position).
2. Adjust the day of month and the month.
• The day of month rotates to the right when the
crown is turned to the left.
• Pressing the month adjustment button changes
the month.
Adjusting the day of month and month
[When the day of month to be set is from the 3rd to the 30th]
①Turn the crown to the left to set the date hand to the current day of the month.
②Press the month adjustment button to set the month to the current month.
[When the day of month to be set is the 31st]
①First, temporarily set the day of month to the 30th.
②Press the month adjustment button to set the month to the current month.
③Turn the crown to the left to set the day to the 31st for the correct day of month.
Crown
Position 1
Month
adjustment
button

13
[When the day of month to be set is the 1st or 2nd]
①First, temporarily set the day of month to the 30th.
②Press the month adjustment button to temporarily set the month to one month
before the current month.
Example: Set to December when making settings for January.
Set to February when making settings for March.
③Turn the crown to the left to set the day to the 1st or the 2nd for the correct
day of month.
The month changes to the current month at the same time the day of month
changes from the 31st to the 1st.
3. Return the crown to the normal position.
• Due to the construction of the mechanism, temporary adjustment is required in order
to set the correct date.

14
1. When the second hand reaches the 12:00
position, pull out the crown to position 2
(time adjustment position).
2. Turn the crown to the right (clockwise) to
adjust the time.
Adjust the time while paying attention to
a.m./p.m. by noting the time at which the
date changes.
3. Set the time to the time signal time, etc. and
return the crown to the normal position.
Setting the Time
[Hints for accurate adjustment]
The time can be more accurately adjusted by first stopping the second hand at the
12:00 position, advancing 4 to 5 minutes past the time that the hour and minute
hand are to be set to, and then set the current time by backing the hands into
position by rotating the hands counterclockwise.
Crown
Position 2

15
[NOTE]
①If you adjust the day of month when a time between 9:00 p.m. and 12:00
midnight is being displayed, the day of month sometimes does not change to the
next day even if the actual date changes. Avoid changing the day of month
during this time period.
②The day of month indicated by this watch follows a 31-day cycle. To advance to
the 1st of the next month after a short month (a month having 30 days or
February), pull out the crown to position 1 and turn it to the left.
③Avoid adjusting the month when the date hand indicates a day from the 31st to
the 2nd.
To make adjustment during this period, first set the day of month outside the
range of the 31st to the 2nd, and then adjust the month. Then, set the day of
month that the date hand should point to.

16
This watch uses a rechargeable cell to store electrical energy. When the watch is
fully charged, it will maintain its accuracy for about 6 months.
<Ensuring best operation of the watch>
Always store the watch in a bright location for best results.
◆Placing the watch near a window where its face can
receive sunlight or near another source of light when
you are not wearing it will ensure that the watch is
regularly charged, allowing it to maintain its accuracy.
Solar Power
6. Solar Power Function

17
◆Wearing clothes with long sleeves makes it difficult for the watch to get the
necessary light, resulting in insufficient charging.
We recommended that you charge the watch for a long time in direct sunlight
once a month.
[NOTE]
Do not charge on surfaces that can easily
become hot, such as a car dashboard.
6. Solar Power Function

18
◎When the watch is insufficiently charged, the indication will be changed as follows:
[Normal indication]
The second hand moves at 1-second intervals
The watch has been insufficiently charged because
the watch face has not received sufficient light
As the battery recharges
The display time will be incorrect because the watch has
stopped due to insufficient charge. Adjust to the correct time.
7. Characteristics of the Eco-Drive Watch

19
[Insufficient charge warning]
The second hand moves at 2-second intervals
[Stopped status]
The watch stops
As rechargeable cell
capacity diminishes
without charging
The watch must be subjected to enough light for a sufficient charge until the watch
hands begin moving.
The second hand starts moving at 2-second intervals.
7. Characteristics of the Eco-Drive Watch
2 second
2 second

20
Insufficient Charge Warning Function
When the watch is insufficiently charged, the
second hand begins moving at 2-second
intervals to notify you that the watch charge is
insufficient.
Although the watch keeps accurate time during
this period, the watch will stop completely if
operation with an insufficient charge continues
for approximately three or more days. Restore
the 1-second interval movement of the second
hand by subjecting the watch to light so that it
recharges. To use the watch with complete
peace of mind, be sure to fully recharge the
battery even after the second hand returns to the 1-second interval movement.
Although the watch can be started again by subjecting it to light after it stops due
to insufficient charge, the time given will no longer be correct, so be sure to fully
charge the battery and adjust to the correct time.
2 second
2 second