Citizen 8635 User 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

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English
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
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).

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

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English
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 day hand advances together with the hour hand and minute hand, so set the
day first, and then set the time.

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Setting the Time and Calendar
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English
2) Setting the date
Pull out the
crown Set the date Return the crown
1 0
Pull the crown
out one ‘step’ to
position 1.
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).)
Return the crown
to the normal
position ( 0).
Note
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.

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Setting the Time and Calendar
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English
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.
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.
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English
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
* WATER RESIST(ANT) xx bar may also be indicated as W.R. xx bar.

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Precautions
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English
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.
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.