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

3
■ 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.
M
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7

7
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