Citizen J810 User manual

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3
English
To determine the movement number
Your watch features a case number engraved on
the case back (refer to figure to the right).
On the case back, a number composed of four +
six alphanumeric characters (or more) is engraved.
In the example on the right, “1234” is the
movement number.
Thank you for your purchase of this Citizen watch.
Before using the watch, read this instruction manual carefully to ensure
correct use.
After reading, be sure to store this manual in a safe place should it be
needed for future reference.
✳The case has different features depending on the model.
Details of model specific features may not be outlined in this manual. See
“ http://www.citizenwatch.jp/support/default.htm ”.
<Engraving position example>
e engraving position may dier
depending on watch model.
1
2
3
4
-
5
6
7
8
9
0
1234-567890

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English
■ Important instructions are categorized and depicted in this manual as follows:This manual may contain certain safety advisories. Your watch should be used
in accordance with these advisories at all times to ensure optimal enjoyment of
your watch and to prevent injury to yourself, other persons and/or damage to
property.
■ Safety advisories are categorized and depicted in this manual as follows:
Highly likely to cause death or serious injury
May cause serious injury or death
May or will cause minor or moderate injury or damage
Warning (caution) symbol followed by instructions that should be
followed and/or precautions that should be observed.
Warning (caution) symbol followed by prohibited use and/or
operation advisory.
Safety Precautions Safety Precautions
DANGER
WARNING
CAUTION

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English
Features ………………………………………………………………… 7
Guide to Charging Time ……………………………………………… 8
Notes Before Use …………………………………………………… 10
Component identication ………………………………………… 13
Setting the Time …………………………………………………… 14
Setting the Calendar (For models with Date/Day indication)………… 16
Eco-Drive (solar powered) Watch Handling Precautions………… 18
Water resistance …………………………………………………… 22
Precautions and usage limitations ………………………………… 25
Maintenance ………………………………………………………… 30
Information ………………………………………………………… 31
Specications ……………………………………………………… 32
Table of contents
◆Eco-Drive (solar powered) watch
The watch operates by converting sunlight and other light into electrical energy. Once the
rechargeable cell is fully charged, the watch will function for approximately 8 months.
◆Insufficient charge warning
If the power becomes very low, the second hand advances
at 2-second intervals, indicating that charging is necessary.
When the second hand starts to advance at 2-second
intervals, expose the watch to light until it is fully charged.
◆Quick start function
When the stopped watch is exposed to light, it starts operating again.
Features
If the watch is not exposed to light within approximately 5 days aer the insucient
charge warning starts, the watch will stop.
Aer quick start, expose the watch to light until it is fully charged. Set the correct time
before using the watch.

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English
Guide to Charging Time
Below are the approximate times needed for charging when exposing the watch
dial to light continuously. Please use this table as a reference only.
＊To charge the rechargeable cell fully, it is recommended to expose the dial to direct
sunlight. A uorescent lamp or interior lighting does not have sucient illumination to
charge the rechargeable cell fully.
is watch will run for approximately 8 months from a full charge without further exposure
to light.
Guide to Charging Time
Illuminance
(Lx) Environment
Charging time (approximate)
Charging
time to work
for one day
Charging time to start
working normally
(second hand moves in
1-second steps) when the
rechargeable cell is empty
Charging time to
the fully charged
state when the
rechargeable cell
is empty
10000 to
100000
Outdoors
(sunny sky,
cloudy sky)
7 to 25
minutes 4 to 15 hours 30 to 120 hours
3000 20 cm under a uorescent lamp
(30 W) 50 minutes 30 hours 240 hours
500 Interior lighting 4 hours 200 hours —

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English
Notes Before Use
Notes Before Use
• When the watch is regularly covered with long sleeves, it may not be charged
suciently. Try to keep the watch exposed to light sucient for charging.
• Do not charge the watch at a high temperature (about 60ºC/140˚F or higher).
◆Notes before use - Protective stickers
Prior to the watch being shipped from the manufacturing plant, its glass, case,
metal band, and metal parts of the clasp are covered with stickers to protect
them from getting fingerprints or scratches during transit from the plant to the
store. If the watch is worn without first removing these stickers, perspiration
or moisture may enter the gaps between the protective stickers and the parts,
which may result in a skin rash and/or corrosion of the metal parts.
For this reason, please be sure to peel off the stickers before wearing the watch.
◆Notes on charging your watch
This watch has a rechargeable cell which is charged by exposing the dial to
light, such as direct sunlight or fluorescent lamps. After taking off the watch,
put it in a location where the dial is exposed to bright light, such as by a
window.
For optimal performance, perform the following:
• Expose the watch with the dial facing towards direct
sunlight for five to six hours at least once a month.
• Do not store the watch in a dark place with no light
for a prolonged period of time.

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Notes Before Use Component identification
◆About the crown
Some models use screw down system for the crown.
Accidental operations can be prevented when the watch is not being operated
by locking the crown. To operate the watch, release the lock.
• If your watch does not have a screw down crown, operations can be
performed without locking or unlocking the crown.
Before operation After operation
When the screw lock
is released, the crown
extends to the normal
position.
Unlock the crown
Rotate the crown to the
left (counterclockwise).
Lock the crown
Press the crown and
rotate it to the right
(clockwise) to tighten
the screw lock.
Minute hand
Crown
Date/Day indicator
(if equipped)
* The illustrations in this instruction manual may dier from the actual appearance of your watch.
Hour hand
Second hand

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English
Setting the Time
Setting the Time
Pull the crown out to
position 2.
Press the crown back into
its normal position.
Rotate the crown to
set the time.
Pull out the crown just as the
second hand is at the 0 second
position in order to accurately
align to the second.
Refer the time signal and push the
crown to set the time.
Be sure to secure if the watch has a
screw down crown.
Water may enter your watch.
For more accurate adjustment, rst
set the minute hand forward by ve
minutes and then return it to the
correct time.
1 32

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English
Setting the Calendar (For models with Date/Day indication)
Setting the Calendar (For models with Date/Day indication)
Pull the crown
out to position 1.
Press the crown
back into its
normal position.
Rotate the crown
counterclockwise to set the date.
Be sure to secure
if the watch has a
screw down crown.
Water may enter
your watch.
1 32
Rotate the crown clockwise to set the day.
For models with Day indication:
Avoid adjusting the calendar when the hands
indicate the following times.
The calendar may not be changed correctly.
Date indication model:
Approximately from 9 p.m. to 1:00 a.m.
Date/Day indication model:
Approximately from 9 p.m. to 4:30 a.m.
* Some models are designed to show the day indication
in languages other than Japanese and English.

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English
Eco-Drive (solar powered) Watch Handling Precautions
<Always be Sure to Expose Your Watch to Light Regularly>
• Your watch enjoys regular exposure to light. Wearing in situations that prevent light exposure such
as long shirt or coat sleeves will prevent your watch from receiving light sufficient for charging. In
these instances, supplemental charging may be needed.
• When you take your watch off, try and place it in a bright location. This will ensure your watch
receives light for charging and will continue to operate properly. Storing your watch in dark places
for extended periods of time may cause the stored energy to become depleted and your watch to
stop.
CAUTION Recharging Precautions
• Do not charge your watch at high temperatures (60°C/140°F) as
this may cause damage to sensitive components and the watch to
malfunction.
Examples:
• Charging the watch too close to a light source which generates
a large amount of heat such as an incandescent lamp or
halogen lamp.
* When charging your watch under an incandescent lamp,
be sure to leave 50 cm (19-11/16 inches) distance between
the lamp and the watch to avoid excessive heat. Never use a
halogen lamp for recharging as these generate excessive heat.
• Charging the watch in a location where the temperature may become extremely high such as on
the dashboard of a vehicle.
Eco-Drive (solar powered) Watch Handling Precautions