Citizen Eco-Drive BN2031-85E User manual

INSTRUCTION MANUAL

1
To check the movement number
A case number—4 alphanumeric characters and 6 or
more alphanumeric characters—is engraved on the
case back. (Figure on the right)
The first 4 characters of the case number represent
the movement number of the watch. In the example
on the right, “ ” 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 the manual, store it in a safe place for future reference.
Be sure to visit the Citizen website at http://www.citizenwatch-global.com/ .
Here you will find a variety of information such as electronic setting guides,
answers to frequently asked questions, Eco-Drive recharging information and
more.
Engraving position example
The engraving position may
differ depending on watch
model.

2
Safety precautions — IMPORTANT
This manual contains instructions that should be strictly followed at all times
not only for optimal use, but to prevent any injuries to yourself, other persons or
property. We encourage you to read the entire booklet (especially, pages 4, 5, and
52 to 65) and understand the meaning of the following symbols:
■ Safety advisories are categorized and depicted in this manual as follows:
DANGER
Highly likely to cause death or serious injury
WARNING
Can cause serious injury or death
CAUTION
Can or will cause minor or moderate injury or damage

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■ Important instructions are categorized and depicted in this manual as follows:
(Following symbols are examples of Pictograms.)
Warning (caution) symbol followed by prohibited matters.
Warning (caution) symbol followed by instructions that should be
followed or precautions that should be observed.
Safety precautions

4
Safety precautions Safety precautions
About water depth measurement
This watch is not designed to function as a specialized water-depth measuring
instrument certified by authorities. It is intended for use as an auxiliary reference
to your primary dive instrument. Be sure to use a specialized device designed for
diving as your primary dive instrument and depth reference.
Be sure you are properly trained and certified for diving.

5
Safety precautions Safety precautions
DANGER
The water-depth measurement function of this watch is not
certified as a measuring instrument by authorities.
Be sure to use a specialized instrument along with this watch
when diving. Do not rely solely on this watch’s function.
WARNING
Do not use the water-depth measurement function of this
watch in the following cases:
• When judgments involving risks are required by the
situation or for the actions.
• When the situation requires special treatments.
• When the power reserve is insufficient. (→ page 18)
CAUTION
Measurement results may be inaccurate in the following cases:
• When water depth changes rapidly or suddenly.
• When any foreign matter, dirt or debris is on or around the
water pressure sensor.

6
Features
Eco-Drive
Never needs a new battery.
This watch is fueled by
light.
Automatic water depth
measurement
The water sensor detects
water contact and starts
water depth measurement
automatically.
Rapid ascent warning
alarm
The water pressure sensor
on the watch detects rapid
ascent and alerts the user
with an alarm tone.
Maximum water depth
indication
You can view the
maximum water depth
for the last dive even after
finishing measurement.
• “Eco-Drive” is an original technology of Citizen.
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CONTENTS
About water depth
measurement ............................... 4
Before using this watch..........
9
Band adjustment ........................... 10
Protective stickers ......................... 10
How to use the screw crown/
button ............................................ 11
Component identification ...
12
Charging your watch ...........
14
Checking the current power
reserve..............................
18
Water depth
measurement....................
20
Before measurement ................... 20
Rapid ascent warning alarm...... 24
Reviewing the maximum water
depth record......................
30
About the “OVER”
indication..........................
32
Setting the time .................
34
Adjusting the calendar........
35
Continued on the next page

8
CONTENTS
Using the rotating bezel......
36
Checking and correcting the
reference position .............
38
Troubleshooting .................
44
Eco-Drive watch handling
precautions .......................
52
Water resistance .................
56
Precautionary items and
usage limitations...............
59
Specifications .....................
66

9
After unpacking, the following must be done before using the watch:
Check the power reserve indication. (→ page
18
)
Charge immediately if the power reserve level is “0” or “1”.
This watch has a rechargeable cell which is charged by
exposing the dial to light.
Expose the dial to direct sunlight regularly to charge the
watch.
For details of charging, see pages 14 to 19.
Before using this watch
Continued on the next page

10
Band adjustment
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.
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 between
the protective stickers and the parts, which may result in a skin rash and/or
corrosion of the metal parts.
Before using this watch Before using this watch

11
How to use the screw crown/button
Some models are equipped with a specially designed crown and/or push button to
prevent accidental operation.
Screw down crown/button
Unlock the crown/button prior to operate your watch.
Unlock Lock
Screw down
crown
Rotate the crown
counterclockwise until
it releases from the case.
Push the crown in to the
case. With gentle pressure
towards the case, rotate
the crown clockwise to
secure it to the case. Be
sure to tighten firmly.
Screw down
push button
Rotate the locking screw
counterclockwise, and
loosen until it stops.
Rotate the locking screw
clockwise, and tighten
firmly.
Before using this watch Before using this watch

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OVER
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Minute hand
Water pressure
sensor
Hour hand
Date indication
Second hand
Power reserve
indication hand
Lower left button
Upper left button
Crown
During daily use
12
Component identification
• The illustrations in this instruction manual may differ from the actual appearance
of your watch.
• A solar cell is placed under the dial.

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Rotating bezel
Water depth
hand
Maximum water
depth hand
Minute hand
Water pressure
sensor
Hour hand
Date indication
Second hand
Power reserve
indication hand
Water sensor
Lower left button
Upper left button
Crown
During water depth measurement
13
Component identification

14
This watch has a rechargeable cell which is charged by
exposing the dial to light, such as direct sunlight or fluorescent
lamps (refer to pages
16
and
17
for charging guidelines).
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, be sure to:
•
Expose it to direct sunlight for 5 or 6 hours at least once a
month.
• Avoid leaving it in dark places for long periods of time.
CAUTION
• Do not charge the watch at high temperature (about 60°C (140°F) or higher).
• If the watch is obscured from light by long sleeves frequently, supplemental
charging may be needed to ensure continual operation.
Charging your watch

15
Continued on the next page
When the watch reaches a low charge state (insufficient charge warning
function)
When the power reserve becomes low, the second hand
moves once every two seconds. This is the insufficient charge
warning function. Be sure to fully charge your watch as
outlined on pages 16 and 17.
• When the watch is sufficiently charged, the second hand will
move normally.
• If you do not charge the watch for 4 days or longer after the
insufficient charge warning movement has begun, the watch will be depleted of
all power and stop.
CAUTION
• When in the insufficient charge warning state, the current time and date are
indicated. However, measurement functions of the watch will not be available
for use.
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Charging your watch

16
Charging time by environment
Below are the approximate charging times when exposing to light continuously.
Please use this table as a reference only.
Environment Illuminance (lx)
Charging time (approx.)
To work for one day
To start working
normally when the
cell is discharged
To become fully
charged when the cell
is discharged
Outdoors (sunny) 100 000 3 minutes 2 hours 35 hours
Outdoors
(cloudy) 10 000 11 minutes 3.5 hours 80 hours
20 cm (8 inches)
away from a
fluorescent lamp
(30W)
3 000 40 minutes 8 hours 280 hours
Interior lighting 500 4 hours 50 hours −
Charging your watch Charging your watch

17
• To charge your watch, it is recommended to expose the dial to direct sunlight.
Optimal charging is achieved by exposing the dial to direct sunlight outdoors for
a short time each day.
• After charged fully, the watch runs without additional charging for about 11
months.
Charging your watch Charging your watch

18
Checking the current power reserve
Power reserve level scale
• The power reserve indication hand points to “READY” as the water sensor detects
water. (→ page 22)
The power reserve level
• You cannot use measurement functions while the power reserve level is in “0”.
However, you can see the current time. Frequent use of measurement functions
makes power duration shorter.
Power reserve indication
hand
Power reserve level scale
READY indication
READY
E
READY

19
Checking the current power reserve
The power reserve level is indicated in the four stages shown below.
Level 3 2 1 0
Power reserve
level scale
READY
E
READY
E
READY
E
READY
E
Duration
(approx.) 340 - 300 days 300 - 200 days 200 - 4 days 4 days or shorter
Meaning
Power reserve is
sufficient.
Power reserve is
OK.
Power reserve is
getting low.
Power reserve is
insufficient. The
insufficient charge
warning will start
soon.
OK for normal use Charge immediately.