Citizen Eco-Drive 8637 User manual

INSTRUCTION MANUAL

1
English
• NotesBeforeUse...................................................2
Notes on charging your watch..........................................2
• YourWatch..............................................................4
• NameofComponents............................................6
About the crown ...............................................................7
• SettingtheTimeandCalendar.............................8
1) Setting the time and day ..............................................8
2) Setting the date..........................................................10
• Troubleshooting...................................................13
• Precautions...........................................................14
• Specifications.......................................................24
TableofContents

2
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.
NotesBeforeUse
Environment
Charging
Environment
Illumination(lx)
ChargingTime(approximate)
Chargingtime
requiredto
maintainnormal
operationfor
1day
Chargingtime
requiredto
returntonormal
operationafter
thewatchstops
Timerequired
toreachfull
chargingafterthe
watchstops
Direct sunlight
(Outdoors) 100,000 2 minutes 50 minutes 13 hours
Cloudy (Outdoors) 10,000 10 minutes 5 hours 35 hours
Less than
20 cm from 30 W
fluorescent light
3,000 35 minutes 17 hours 120 hours
Indoor 500 3.5 hours 120 hours 800 hours

3
English
Foroptimalperformance
• Expose the watch with the dial towards direct sunlight for several hours at least
once a month.
• After taking off the watch, put it in a position so that the dial is exposed to
bright light, such as by a window.
• Before storing the watch in a dark place for an extended period of time, be sure
to charge it fully.
When the watch is regularly covered with long sleeves, it may not be charged
sufficiently. Try to keep the watch exposed to light sufficient for charging.
Do not charge the watch at a high temperature (about 60°C/140°F or higher).

4
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
6 months.
YourWatch
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.
If the watch is not exposed to light within
approximately 4 days after the insufficient
charge warning starts, the watch will stop.

5
English
Quickstartfunction
When the stopped watch is exposed
to light, it starts operating again
immediately.
After quick start, expose the watch to
light until it is fully charged. Set the
correct time before using the watch.
Overchargingprevention
function
Once the watch is fully charged, an
overcharging prevention function will
automatically activate so that it is not
charged any further.
No matter how much the watch
is charged, it will not affect the
rechargeable cell, time accuracy,
functions or other performance.

012
6
24
12
18
6
The illustrations shown in this manual may differ from the actual watch you have
purchased.
Hour
hand
Day
hand
Second
hand
24 hour
hand
Minute hand
Date hand
Crown
Normal position (
0
)
Position 1 (
1
)
(Setting the date)
Position 2 (
2
)
(Setting the time
and day)
NameofComponents

7
English
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.
Beforeoperation Afteroperation
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.
1
2
When the screw lock is released, the
crown extends to the normal position.

8
SettingtheTimeandCalendar
1)Settingthetimeandday
Pull out the crown Set the day Set the time Return the crown
2
0
With the second hand in
the 0-second position, pull
the crown out two ‘steps’ to
position 2.
Rotate the crown to the right (clockwise)
to set the day. (The day hand moves when
the hour hand is indicating between 0 a.m. and
5 a.m.)
Rotate the crown to set the time,
paying attention to a.m. and p.m.
Return the crown to the normal
position (
0
) in sync with a
reliable time source.
•The24hourhandmovestogetherwiththehour
hand and minute hand

9
English
Pull out the crown Set the day Set the time Return the crown
2
0
With the second hand in
the 0-second position, pull
the crown out two ‘steps’ to
position 2.
Rotate the crown to the right (clockwise)
to set the day. (The day hand moves when
the hour hand is indicating between 0 a.m. and
5 a.m.)
Rotate the crown to set the time,
paying attention to a.m. and p.m.
Return the crown to the normal
position (
0
) in sync with a
reliable time source.
The day hand advances together with the hour hand and minute hand, so set the
day first, and then set the time.

10
Setting the Time and Calendar
2)Settingthedate
Pull out the
crown Set the date Return the crown
1
6
24
12
18
Rotate the
crown to the left
(counterclockwise) to
set the date. (The date
does not change when
you rotate the crown to
the right (clockwise).)
0
Pull the crown
out one ‘step’ to
position 1.
Return the crown
to the normal
position (
0
).

11
English
Pull out the
crown Set the date Return the crown
1
6
24
12
18
Rotate the
crown to the left
(counterclockwise) to
set the date. (The date
does not change when
you rotate the crown to
the right (clockwise).)
0
Pull the crown
out one ‘step’ to
position 1.
Return the crown
to the normal
position (
0
).
Aboutthescrewdowncrown
Release the screw lock before rotating the crown to
set the time and calendar. After setting the time and
calendar, be sure to press and rotate the crown to tighten
the screw lock (p.7). If your watch does not have a
screw down crown, operations can be performed without
locking or unlocking the crown.
Settingtheday
The day hand moves when the hour hand is indicating
between 0 a.m. and 5 a.m. Pay attention to a.m. and p.m.
when setting the time.
Settingthedate
Do not change the date while the hour hand is indicating
between 9 p.m. and 1 a.m. If you change the date during
this time, the date may not change the following day.
Note

12
Setting the Time and Calendar
Tips
Settingthetime
• When setting the time, determine a.m. and p.m. by the time period
when the day hand moves.
• Advance the minute hand by 4 or 5 minutes past the correct time,
and then return it to the correct time in order to set the time more
accurately.
Settingthedate
The date has a 31-day cycle. Re-set the correct date at the start of
March, May, July, October and December.

13
English
Problem Causeandremedy
The second hand moves at
2-second intervals.
The watch has stopped.
The charge is insufficient.
Charge the watch until the second hand moves
at 1-second intervals (p.2).
The day and date change
around noon.
The a.m. and p.m. are reversed.
Set the correct time (a.m. or p.m.), paying
attention to the time period when the day hand
moves (p.8, 11).
The second hand does not
move at 1-second intervals,
even when the watch is
charged.
The watch does not operate
even when charged.
The watch stops soon even
when charged.
Contact your dealer or Citizen Service Center.
Troubleshooting

WARNING
Water-resistance
performance
• There are several types of
water-resistant watches, as
shown in the following table.
The unit “bar” is roughly equal
to 1 atmosphere.
• For correct use within the
design limits of the watch,
confirm the level of water-
resistance of your watch, as
indicated on the dial and case,
and consult the table.
14
Precautions
Indication
Specifications
Examplesofuse
Minor exposure to
water (washing face,
rain, etc.)
Moderate exposure
to water (washing,
kitchen work,
swimming, etc.)
Marine sports
(skin diving)
Scuba diving
(with air tank)
Operation of the
crown or button with
moisture visible
Dial Case
(case back)
WATER RESIST or
no indication WATER RESIST(ANT) Water-resistant to 3 atmospheres OK NO NO NO NO
WR 50 or
WATER RESIST 50
WATER RESIST(ANT)
5 bar or WATER
RESIST(ANT)
Water-resistant to
5 atmospheres OK OK NO NO NO
WR 100/200 or
WATER RESIST
100/200
WATER RESIST(ANT)
10bar/20 bar or WATER
RESIST(ANT)
Water-resistant to
10/20 atmospheres OK OK OK NO NO

15
English
Indication
Specifications
Examplesofuse
Minor exposure to
water (washing face,
rain, etc.)
Moderate exposure
to water (washing,
kitchen work,
swimming, etc.)
Marine sports
(skin diving)
Scuba diving
(with air tank)
Operation of the
crown or button with
moisture visible
Dial Case
(case back)
WATER RESIST or
no indication WATER RESIST(ANT) Water-resistant to 3 atmospheres OK NO NO NO NO
WR 50 or
WATER RESIST 50
WATER RESIST(ANT)
5 bar or WATER
RESIST(ANT)
Water-resistant to
5 atmospheres OK OK NO NO NO
WR 100/200 or
WATER RESIST
100/200
WATER RESIST(ANT)
10bar/20 bar or WATER
RESIST(ANT)
Water-resistant to
10/20 atmospheres OK OK OK NO NO
* WATER RESIST(ANT) xx bar may also be indicated as W.R. xx bar.

16
Precautions
WARNING Water-resistanceperformance
• Water-resistance for daily use (to 3 atmospheres): This type of watch is water-
resistant to minor exposure to water. For example, you may wear the watch while
washing your face; however, it is not designed for use underwater.
• Upgraded water-resistance for daily use (to 5 atmospheres): This type of watch
is water-resistant to moderate exposure to water. You may wear the watch while
swimming; however, it is not designed for use while skin diving.
• Upgraded water-resistance for daily use (to 10/20 atmospheres): This type of watch
may be used for skin diving; however, it is not designed for scuba or saturated diving
using helium gas.

17
English
CAUTION
• Be sure to use the watch with the crown pressed in (normal position). If your watch
has a screw down crown, be sure to tighten the crown completely.
• Do NOT operate the crown or button with wet fingers or when the watch is wet.
Water may enter the watch and compromise water-resistance.
• If the watch is used in seawater, rinse with fresh water afterward and wipe with a dry
cloth.
• If moisture has entered the watch, or if the inside of the crystal is fogged up and does
not become clear within a day, immediately take the watch to your dealer or Citizen
Service Center for repair. Leaving the watch in such a state will allow corrosion to
form inside.
• If seawater enters the watch, place the watch in a box or plastic bag and immediately
take it in for repair. Otherwise, pressure inside the watch will increase, and parts
(crystal, crown, buttons, etc.) may come off.

18
Precautions
CAUTION Keepyourwatchclean
• Leaving dust and dirt deposited between the case and crown may result in difficulty
in pulling the crown out. Rotate the crown while in its normal position, from time to
time, to loosen dust and dirt and then brush it off.
• Dust and dirt tend to be deposited in gaps in the back of the case or band. Deposited
dust and dirt may cause corrosion and soil your clothing. Clean the watch
occasionally.
CleaningtheWatch
• Use a soft cloth to wipe off dirt, perspiration and water from the case and crystal.
• Use a soft, dry cloth to wipe off perspiration and dirt from the leather band.
• To clean a metal, plastic, or rubber watchband, wash away dirt with mild soap and
water. Use a soft brush to remove dust and dirt jammed in the gaps in the metal band.
If your watch is not water-resistant, take it to your dealer.
Note:Avoid using solvents (thinner, benzine, etc.), as they may damage the finish.

19
English
CAUTION Operatingenvironment
• Use the watch within the operating-temperature range specified in the instruction
manual. Using the watch where temperatures are outside the specified range, may
result in deterioration of functions or even stoppage of the watch.
• Do NOT use the watch in places where it is exposed to high temperature, such as in a
sauna. Doing so may result in a skin burn.
• Do NOT leave the watch in a place where it is exposed to high temperature, such as
the glove compartment or dash-board of a car. Doing so may result in deterioration of
the watch, such as deformation of plastic parts.
• Do NOT place the watch close to a magnet. Timekeeping will become inaccurate if
you place the watch close to magnetic health equipment such as a magnetic necklace
or a magnetic latch of a refrigerator door or handbag clasp or the earphone of a
mobile phone. If this has occurred, move the watch away from the magnet and reset
the time.
• Do NOT place the watch close to household appliances that generate static electricity.
Timekeeping may become inaccurate if the watch is exposed to strong static
electricity, such as is emitted from a TV screen.