Page 1
INSTRUCTION MANUAL
Page 2
ENGLISH
FRANÇAIS
ESPAÑOL
DEUTSCH
ITALIANO
PORTUGUÊS
中文（繁体字）
中文（簡体字）
Page 3
Features
English
Eco-Drive watches take a special
cell and do not need periodical
battery replacement. (→ page 9)
The date window—
large and highly visible
The calendar—no date correction
at the end of months (→ page 13)
1
Page 4
Table of contents
Part names and their main functions .............................................................. 4
How to use the screw down crown ......................................................................5
When leaving the watch unused for an extended period of time .................... 5
Charging the battery .......................................................................................... 6
Charging the battery .............................................................................................. 6
When the battery becomes short of power
—Insufficient charge warning function ...........................................................7
Charging time ......................................................................................................... 8
After the battery is fully charged
—Overcharge prevention function ................................................................... 9
Setting the time ................................................................................................. 10
Checking the date, month, and year..............................................................12
Perpetual calendar ................................................................................................ 13
Setting the year, month, and date.................................................................. 14
Eco-Drive watch handling precautions ......................................................... 22
2 3
Page 5
Water resistance ................................................................................................24
Precautionary items and usage limitations .................................................. 27
Troubleshooting ..............................................................................................34
• The second hand moves only once every two seconds.
• All hands stop moving.
• The figures are not displayed upright.
• The date is wrong.
• The date changes to the following day at around noon.
• The watch does not work properly.
• The watch does not move even if the battery is fully charged.
Checking and correcting the reference position ......................................... 36
Resetting the watch .......................................................................................... 40
Specifications ..................................................................................................... 42
English
Page 6
Part names and their main functions
Minute hand
Date
Hour hand
24-hour hand:
Goes around once
a day
Second hand
The illustrations in this instruction manual may differ from the actual appearance of your watch.
4 5
Button B:
For setting the
calendar‑related functions
Crown:
For setting the time, checking
the date, etc.
Button A:
For setting the date etc.
Example of a button
Press HERE.
Page 7
7 How to use the screw down crown
To release the crown
Turn the crown to the left until it pops out slightly.
To lock again
Tighten the crown completely by pressing and turning
it to right.
7 When leaving the watch unused for an extended period of time
Pull out the crown to position .
All hands stop moving and the battery power is
saved.
• The date will change to the following day every
24 hours once you have pulled out the crown to
position .
English
Page 8
Charging the battery
7 Charging the battery
This watch has a battery which is charged by exposing the dial to light such as
direct sunlight or fluorescent lamps.
To obtain the best performance:
• Expose the dial to direct sunlight at least once a month.
• After taking off the watch, put it where 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, fully
charge the battery.
When the watch is covered with long sleeves, for example, the battery may not
be charged sufficiently. Try to keep the watch exposed to light.
Do not charge the battery at a high temperature (about 60˚C/140˚F or
higher).
6 7
Page 9
7 When the battery becomes short of power—Insufficient charge
warning function
When the battery becomes short of power, the second hand moves once
every two seconds—insufficient charge warning function. Charge the
battery by exposing the dial to light.
The two-second
interval movement
• After the battery is charged for a while, the
second hand will move normally.
• If you have not charged the battery for three
days or more since the warning movement
began, the battery will run out and the watch
will stop.
NOTICE:
You cannot check or adjust the settings while
the warning movement continues, though
you can see the time.
English
Page 10
Charging the battery
7 Charging time
Below are the approximate values when exposing to the light continuously.
The charging time differs depending on the color of dial or other conditions.
Use the table below only for your reference.
Illuminance
(Lx)
Battery duration after full charging (without further charging) About 12 months
8 9
Environment
500 Interior lighting 4 hours 60 hours —
20 cm (8 in.) under a fluorescent
3,000
lamp (30 W)
10,000 Under cloudy weather 11 minutes 2.5 hours 70 hours
100,000 Under direct sunlight in summer 2 minutes 45 minutes 35 hours
Charging time to
work for one day
(approx.)
40 minutes 7.5 hours —
Charging time to start
working normally when the
battery is empty (approx.)
Page 11
Time for charging fully
when the battery is
empty (approx.)
English
7 After the battery is fully charged—
Overcharge prevention function
After the battery is fully charged, charging
automatically stops to prevent overcharging, which
may damage to the battery, or affect the accuracy,
functions, and performance of the watch.
Page 12
Setting the time
Date window
Second hand
24-hour hand
10 11
1. Pull out the crown to position .
All hands stop moving.
• To set the time accurately, pull out the
crown when the second hand is at the
0‑second position.
Page 13
2. Turn the crown to set the time.
All hands other than the second hand will move.
• Take care of the position of the 24‑hour hand to set A.M. or
P.M. correctly.
• When you set the hands to around midnight, the date will
change to the following day. To return to the previous day, set
the hands to any position before 23:30.
Go to step 3 after the date has completely stopped.
3. Push in the crown to position .
The watch starts moving.
• To set the time accurately, push in the crown by the time signal.
English
Page 14
Checking the date, month, and year
You can check the date, month, and year*1.
Date window
The crown
position
The button
operation
Button
To check a
date
To check a
month
To check an
A
year
—
—
Pressing
button A*
2
*1 This watch shows the number of years passed since the last leap year.
*2 Each time you press button A while the crown is set to position , you can display
the month and year alternately.
12 13
Page 15
Display examples of the date window
When checking a date
Ex. 5th day
English
When checking a month
When checking an year
Perpetual calendar
The date is automatically adjusted until February 28, 2100.
So you do not need to correct it at the end of months.
Ex. February
• “M” stands for Month.
Ex. Next year of a leap year
• “L.Y.” stands for Leap Year.
The figures in the date window change slowly.
Page 16
Setting the year, month, and date
NOTICE:
Do not operate between 23:00 and 0:30; otherwise, the date may not change even if the
24‑hour hand moves past midnight.
The calendar setting has the following stages:
Enter the setting mode
(→ page 15)
Before setting:
• You cannot go back to the previous setting.
• You cannot go to the next step while the figures in the date window are moving.
• To stop setting, change the position of the crown. In this case, the settings you have
made are cleared.
14 15
Set the year
(→ page 16)
Set the month
(→ page 18)
Set the date
(→ page 20)
Page 17
1. Enter the setting mode
Date window
Button
B
The figures in the date window move slightly
up and down or right and left, or change to
tell you that you can do the next operation.
1-1. Pull out the crown to position .
The month appears in the date window.
1-2. Press and hold button
figures in the date window start
moving.
until the
B
English
The figures in the date window change slowly.
Go to the next page
Page 18
Setting the year, month, and date
2. Set the year
Set the number of years passed since the last leap year.
Date window
Button
16 17
Button
A
Quick reference chart for number of years
B
passed since leap year
Year Passed year Year Passed year
2016 Leap year 2020 Leap year
2017 One year 2021 One year
2018 Two years 2022 Two years
2019 Three years 2023 Three years
Page 19
2-1. Press button
the year.
repeatedly to set
A
Ex. Setting value Window
When the current
year is a leap year
When two years
have passed
0
2
English
2-2. Press button
Now you can set the month.
.
B
Go to the next page
Page 20
Setting the year, month, and date
3. Set the month
Set the month—tens digit, then ones digit.
Date window
Button
B
Button
A
18 19
Page 21
3-1. Press button
A
of the month.
3-2. Press button
Now you can set the ones digit.
3-3. Press button
B
A
the ones digit of the month.
to set the tens digit
.
repeatedly to set
Month Setting value Window
From January
to September
From October
to December
Ex. Setting value Window
September 9
November 1
M0
M1
English
3-4. Press button
Now you can set the date.
.
B
Go to the next page
Page 22
Setting the year, month, and date
4. Set the date
Set the date—tens digit, then ones digit.
The selectable date differs
depending on the year and
month you have set.
20 21
Date window
Button
Button
B
A
Page 23
4-1. Press button
tens digit of the date.
repeatedly to set the
A
English
Ex. Setting value Window
5th day 0
30th day 3
4-2. Press button
Now you can set the ones digit.
4-3. Press button
.
B
repeatedly to set the
A
ones digit of the date.
5. Finish the setting
Push in the crown to position .
The settings are stored.
Ex. Setting value Window
5th day 5
30th day 0
Page 24
Eco-Drive watch handling precautions
<Always Make Sure to Recharge Frequently>
• For optimal performance, your watch should remain fully charged.
• Long sleeves may inhibit light transmission to your watch.
This may result in your watch loosing charge. In these cases supplemental
charging may be necessary.
• When you take off the watch, place it in a bright location to ensure optimal
performance.
CAUTION
• Do not charge the watch at a high temperature (about 60°C (140°F) or
higher) as doing so may cause the movement 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 under an incandescent lamp, be sure to leave 50cm
(20inches) or more between the lamp and the watch to avoid exposing
the watch to excessive heat.
• Charging the watch in a location where the temperature may become
extremely high such as on the dashboard of a vehicle.
22 23
Recharging Precautions
Page 25
<Replacement of Rechargeable Cell>
• This watch utilizes a special rechargeable cell that does not require periodical replacement. However
power consumption may increase after using the watch for a number of years due to wear of internal
components and deterioration of oils. This may cause stored power to be depleted at a faster rate.
For optimal performance, we recommend having your watch inspected every 2‑3 years for proper
operation and condition check.
WARNING
• The rechargeable cell should never be removed from the watch.
If for any reason it becomes necessary to remove the rechargeable cell from the watch, keep out of the
reach of children to prevent accidental swallowing.
If the rechargeable cell is accidentally swallowed, consult a doctor immediately.
• Do not dispose of the rechargeable cell with ordinary garbage. Please follow the instructions of
your municipality regarding collection of batteries to prevent the risk of fire or environmental
contamination.
WARNING
• Never use a battery other than the rechargeable cell specified for use in this watch.
Although the watch structure is designed so that it will not operate when another type of battery is
installed, if a conventional watch battery or other type of battery is installed in the watch and the
watch is recharged, there is the risk of overcharging which may cause the battery to rupture.
This can cause damage to the watch and injury to the wearer.
When replacing the rechargeable cell, always make sure to use the designated rechargeable cell.
Handling of Rechargeable Cell
Use Only the Specified Battery
English
Page 26
Water resistance
WARNING
• Refer to the watch dial and/or the case back for the indication of the water resistance of your watch.
The following chart provides examples of use for reference to ensure that your watch is used properly.
(The unit “1bar” is roughly equal to 1 atmosphere.)
• WATER RESIST(ANT) ××bar may also be indicated as W.R.××bar.
Name
Non‑water resistant — Non‑water resistant
Everyday‑use water
resistant watch
Upgraded everyday use
water‑resistant watch
24 25
Water Resistance
Indication
Dial or Case back
WATER RESIST Water‑resistant to 3 atmospheres
W. R. 5 bar Water‑resistant to 5 atmospheres
W. R. 10/20 bar Water‑resistant to 10 or 20 atmospheres
Specification
Page 27
Water-related use
English
Minor exposure
to water (washing
face, rain, etc.)
Swimming and
general washing
work
Skin diving, marine
sports
Scuba diving using
an air tank
NO NO NO NO NO
OK NO NO NO NO
OK OK NO NO NO
OK OK OK NO NO
Operate the crown
or button when the
watch is wet
Page 28
Water resistance
• Non‑water resistant models are not designed to come into contact with any moisture. Take care not to
expose a watch with this rating to any type of moisture.
• Water resistance for daily use (to 3 atmospheres) means the watch is water resistant for occasional
accidental splashing.
• Upgraded water‑resistance for daily use (to 5 atmospheres) means that the watch may be worn while
swimming, but is not to worn while skin diving.
• Upgraded water‑resistance for daily use (to 10/20 atmospheres) means that the watch may be worn
while skin diving, but not while scuba or saturated diving using helium gas.
26 27
Page 29
Precautionary items and usage limitations
CAUTION
• Be particularly careful when wearing your watch while holding a small child, to avoid injury.
• Be particularly careful when engaged in strenuous exercise or work, to avoid injury to yourself and
others.
• Do not wear your watch while in a sauna or other location where your watch may become excessively
hot, since there is the risk of burns.
• Be careful when putting on and taking off your watch, since there is a risk of damaging your
fingernails, depending on the manner in which the band is fastened.
• Take off your watch before going to bed.
CAUTION
• Always use the watch with the crown pushed in (normal position). If the crown is of the screw lock‑
type, make sure it is securely locked.
• Do not operate the crown or any push buttons when the watch is wet. Water may enter the watch
causing damage to vital components.
• If water enters the watch or the watch fogs up and does not clear up even after a long time, consult
your dealer or an authorized service center for inspection and/or repair.
To Avoid Injury
Precautions
English
Page 30
Precautionary items and usage limitations
CAUTION
• Even if your watch has a high level of water resistance, please be careful of the following.
• If your watch is immersed in sea water, rinse thoroughly with fresh water and wipe with a dry cloth.
• Do not pour water from a tap directly onto your watch.
• Take off your watch before taking a bath.
• 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, push button, etc.)
may come off.
CAUTION
<Band>
• Leather bands and rubber (urethane) bands will deteriorate over time due to perspiration dirt.
Because of the natural materials, leather band will be worn, deformed, and discolored over time. It is
recommended to replace the band periodically.
• The durability of a leather band may be affected when wet (fading, peeling of adhesive), owing to the
properties of the material. Moreover, wet leather may cause a rash.
• Do not stain a leather band with substances containing volatile materials, bleach, alcohol (including
cosmetics). Discoloration and premature aging may be occurred. Ultraviolet light such as direct
sunlight may cause discoloration or deformation.
28 29
Precautions (continued)
When Wearing Your Watch
Page 31
• It is recommended to take off the watch if it gets wet, even if the watch itself is water‑resistant.
• Do not wear the band too tightly. Try to leave enough space between the band and your skin to allow
adequate ventilation.
• The rubber (urethane) band may be stained by dyes or soil present in or on clothing or other
accessories. Since these stains may not be removable, caution is required when wearing your watch
with items that tend to easily transfer color (articles of clothing, purses, etc.). In addition, the band
may be deteriorated by solvents or moisture in the air. Replace with a new one when it has lost
elasticity or become cracked.
• Please request adjustment or repair of the band in the following cases:
• You notice an abnormality with the band due to corrosion.
• The pin of the band is protruding.
• We recommend seeking the assistance of an experienced watch technician for sizing of your watch. If
adjustment is not done correctly, the bracelet may unexpectedly become detached leading to loss of
your watch or injury.
Consult an authorized service center.
<Temperature>
• The watch may stop or the function of the watch may be impaired in extremely high or low
temperature. Do not use the watch in places where the temperature is outside the operating
temperature range as stated in the specifications.
English
Page 32
Precautionary items and usage limitations
<Magnetism>
• Analog quartz watches are powered by a step motor that uses a magnet. Subjecting the watch to strong
magnetism from the outside can cause the motor to operate improperly and prevent the watch from
keeping time accurately.
Do not allow the watch to come into close proximity to magnetic health devices (magnetic necklaces,
magnetic elastic bands, etc.) or the magnets used in the latches of refrigerator doors, clasps used in
handbags, the speaker of a cell phone, electromagnetic cooking devices and so on.
<Strong Shock>
• Avoid dropping the watch or subjecting it to other strong impact. It may cause malfunctions and/or
performance deterioration as well as damage to the case and bracelet.
<Static Electricity>
• The integrated circuits (IC) used in quartz watches are sensitive to static electricity. Please note that
the watch may not indicate the correct time if exposed to intense static electricity.
<Chemicals, Corrosive Gasses and Mercury>
• If paint thinner, benzene or other solvents or products containing these solvents (including gasoline,
nail‑polish remover, cresol, bathroom cleaners and adhesives, water repellent, etc.) are allowed to
come into contact with the watch, they may discolor, dissolve or crack the materials. Be careful when
handling these chemicals. Contact with mercury such as that used in thermometers may also cause
discoloration of the band and case.
30 31
Page 33
<Protective Stickers>
• Be sure to remove any protective stickers that may be on your watch (case back, band, clasp, etc.).
Otherwise, perspiration or moisture may enter the gaps b etween the protective stickers and the parts,
which may result in a skin rash and/or corrosion of the metal parts.
CAUTION
• Rotate the crown while it is pressed in fully and press the buttons periodically so they do not become
stuck due to accumulations of foreign matter.
• The case and band of the watch come into direct contact with the skin. Corrosion of the metal or
accumulated foreign matter may result in black residue coming from the bracelet when exposed to
moisture or perspiration. Be sure to keep your watch clean at all times.
• Be sure to periodically clean the bracelet and case of your watch to remove accumulated dirt and
foreign matter. In rare circumstances, accumulated dirt, foreign matter may cause irritation with the
skin. If you notice this, discontinue wearing the watch and consult your physician.
• Be sure to periodically clean foreign matter and accumulated materials from the metal band, synthetic
rubber strap (polyurethane) and/or metal case using a soft brush and mild soap. Be careful not to
allow moisture on the case if your watch is not water resistant.
• Leather bands may become discolored by perspiration or dirt. Always keep your leather band clean by
wiping with a dry cloth.
Always Keep Your Watch Clean
English
Page 34
Precautionary items and usage limitations
Caring for Your Watch
• Wipe any dirt or moisture such as perspiration from the case and crystal with a soft cloth.
• For metallic, plastic or synthetic rubber (polyurethane) band, clean it with soap and a soft toothbrush.
Be sure to thoroughly rinse the band after cleaning to remove any soap residue.
• For a leather band, wipe off dirt using a dry cloth.
• If you will not be using your watch for an extended period of time, carefully wipe off any perspiration,
dirt or moisture and store in a proper lo cation, avoiding locations subject to excessively high or low
temperatures and high humidity.
32 33
Page 35
<About Luminous Paint>
The paint on the dial and hands helps you with reading the time in a dark place. The luminous paint
stores light (daylight or artificial light) and glows in a dark place.
It is free from any radioactive substance or any other material harmful to a human body or
environment.
• The light emission will appear bright at first and then diminish as time passes.
• The duration of the light (“glow”) will vary depending on the brightness, types of and distance from
a light source, exposure time, and the amount of the paint.
• The paint may not glow and/or may dissipate quickly if exposure to light was not sufficient.
English
Page 36
Troubleshooting
If you have a problem with your watch, check the table below for a possible
solution before calling for service.
Symptoms Remedies
The hands do not work properly
The second hand moves only
once every two seconds.
All hands stop moving.
Charge the battery.
Push in the crown to position .
Charge the battery.
The date display is not correct
The figures are not displayed
upright.
The date is wrong. Set the year, month, and date correctly.
The date changes to the
following day at around noon.
34 35
Check and correct the reference position.
Check if the 24‑hour hand indicates the
correct time.
Reference
page
7
10
6
36
14
10
Page 37
Symptoms Remedies
Others
The watch does not work
properly even if you have tried
the remedies on page 34.
The watch does not move even
if the battery is fully charged.
Reset the watch, then adjust the
reference position.
Contact the Citizen Service Center or the
store where you purchased your watch.
English
Reference
page
40
–
Page 38
Checking and correcting the reference position
The figures of the date window rotate referring to the “0” position as the
initial position. If the “0” position, the reference position, has moved off
because of shock or other reasons, the figures are not displayed upright.
Correct the reference position following the procedure below when the figures
are not displayed upright.
1. Check the current reference position
Date window
36 37
1-1. Set the crown to position .
Button
B
Page 39
1-2. Press and hold button
until the figures start moving to show the
B
current reference position.
Check the current reference position after the figures have stopped moving.
Position of figures The status of the reference position
“0”s of both digits are
shown upright.
Other than above
The reference position is correct.
Go to step 1-3.
The reference position is wrong.
Ex.
Go to step 2-1 to correct it (→ page 38).
• Follow step 2-1 within two minutes.
English
1-3. Press button
The current date will appear in the date window.
to finish the procedure.
B
• The current date will also appear in the date window if no operation is done for
about two minutes after step 1-2.
Go to the next page
Page 40
Checking and correcting the reference position
2. Correct the reference position
Date window
Button
38 39
Button
B
The figures in the date window move slightly
up and down or right and left, or change to
tell you that you can do the next operation.
2-1. Pull out the crown to position .
You can correct the tens digit of the
reference position.
A
Page 41
2-2. Press button
repeatedly to display
A
the “0” upright.
Each time you press the button, the “0” moves
step by step.
• When you press and hold button A, the “0”
moves seamlessly.
2-3. Press button
Each time you press the button, you can select the tens digit and ones digit
alternately.
to advance to the ones digit setting.
B
2-4. Repeat step 2-2 to correct the ones digit
of the reference position.
3. Finish the correction
Push in the crown to position .
The settings are stored and the current date will appear in the date window.
English
Page 42
Resetting the watch
The watch may not work properly if it is affected by static electricity or shock.
In this case, reset the watch, then adjust the reference position and set the
time, year, month, and date again.
Date window
Button
A
40 41
1. Pull out the crown to position .
All hands stop moving.
Button
B
Page 43
English
2. Press buttons
The reference position and the calendar are reset.
• When the reset is performed, the figures in the date window move slightly up and
down or right and left to tell you that the operation has been completed.
and B at the same time.
A
3. Set the reference position.
Follow the procedure from step 2-2 to 2-4 on page 39.
4. Push in the crown to position .
The settings are stored and “01” appears in the date window.
The calendar is set to “January 1st of a leap year.” To set the time, year, month, and
date again, refer to “Setting the time” (→ page 10) and “Setting the year, month, and
date” (→ page 14).
Page 44
Specifications
Model
Type Analog solar-powered watch
Timekeeping accuracy Within ±15 seconds per month on average (when worn at
Operating temperature range –10˚C/14˚F to +60˚C/140˚F
Display functions • Time: 24 hours, hours, minutes, seconds
Additional functions • Perpetual calendar (until February 28, 2100)
Battery duration without
recharging
Battery Rechargeable cell (lithium button cell), 1pc.
Specifications are subject to change without prior notice.
42
E31*
normal temperatures between 5˚C/41˚F and 35˚C/95˚F)
• Calendar: Years passed since the last leap year, Month,
Date
• Overcharge prevention function
• Insufficient charge warning function
• Fully charged to empty: Approx. 12 months
• Two second interval movement to stop: Approx. 3 days
Page 45
Page 46
Model No.BT0
Cal.E310
CTZ-B8121
＊
1
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