Citizen Eco-Drive b740 User manual

INSTRUCTION MANUAL

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This watch is an analog diver's watch into which an electronic depth meter function
and chronograph function are built.
• When the water sensor gets wet, the watch is automatically shifted to the dive
mode. (Depth meter function)
• The maximum depth in diving is automatically memorized. (Maximum depth
memorizing function)
• The chronograph function measures the time in units of one second for 50 minutes
at maximum. (Chronograph function)
• This watch is a solar-powered watch provided with a solar power generation (Eco-
Drive) function.
Before using
When the watch does not operate according to the instruction manual, it is
insufficiently charged.
Charge the watch for more than 4 hours, approximately 20 cm (8 in.) away
from the fluorescent or incandescent lamp (30 W) as light sources.
When charging the watch, do not put it too close to the light source.
* When charging the watch under direct rays of the sun, charge for more
than an hour.
IMPORTANT

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Safety Precautions (Instructions to be followed at all times)
This manual contains the following instructions that should be strictly followed at all
times to prevent injury to yourself and other persons as well as damage to property.
■Injuries and damage that might be caused by using the watch improperly or
neglecting any of the instructions or precautions contained in this manual are
classified with the following symbols.
DANGER
WARNING
CAUTION
■Important instructions that should be followed are classified with the
following symbols.
Warning (caution) symbol followed by instructions that should be
followed or precautions that should be observed
Warning (caution) symbol followed by prohibited matters.
This symbol indicates matters for which there is the
risk of minor injury or property damage.
This symbol indicates matters for which there is the
risk of death or serious injury.
This symbol indicates matters for which there is a high
risk of death or serious injury.

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DANGER
Please read this manual carefully to make sure you have a thorough understanding of
the handling and operating procedures, displays and limitations of this watch and
ensure its proper use. Improper use of this watch or failure to observe displayed
warnings, cautions and instructions can result in the risk of a fatal or serious accident.
CAUTION
Diving is a sport that involves risk. When using this watch for diving, make sure you
have a proper understanding of the procedures for handling the watch as described in
this manual and observe proper procedures. Handling of this watch in a manner
contrary to that described in this manual may prevent the watch from functioning
properly.
Request to Customers
All repairs performed on this watch, excluding repairs involving the band, are to be
performed at the CITIZEN. When desiring to have your watch repaired or
inspected, please contact the Citizen Service Center.

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WARNING – Before using this watch for diving –
Since the depth meter function of this watch is not approved as an official depth
gauge, be sure to use this function as an auxiliary means to know the
approximate depth.
Diving is a sport that involves risk. Before using this watch while diving, be sure
to receive diving instruction and training from a qualified instructor to acquire
the experience and skills that are required for safe diving. Always observe the
applicable rules.
• Diving with this watch must be limited to recreational diving (diving without
decompression). Do not use this watch for decompression diving, saturated diving
or diving in a high altitude. The depth meter function of this watch works normally in
seawater with temperatures of +10°C to +40°C (50°F to 104°F), however, depth
indication is incorrect in water other than seawater (specific gravity: 1.025).
• Rapid and sharp change of the atmosphere and/or seawater temperature
occasionally affects the indication and performance of the watch. Therefore, it is
recommended that this watch be used together with another depth gauge. Read the
indication of this watch as a rough guideline.
• Even recreational diving involves many risks. Before using this watch as an
auxiliary instrument for diving, be sure you receive right training in scuba diving by a
qualified instructor in order to acquire experience and technique necessary for safe
diving as well as to master the proper way to handle and operate this watch.

WARNING
Each diver should take responsibility for planning and executing his or her own diving
plan to ensure safe diving.
This watch is not equipped with a function that prevents decompression sickness. In
addition, this watch is also unable to check differences in physiological functions of
individual divers or differences in physical condition on that day.
Since the occurrence of decompression sickness is greatly affected by physical
condition, the degree of the risk of decompression sickness varies depending on your
physical condition on that day. It is recommended to avoid diving whenever you are in
poor physical condition such as when you are ill, fatigued, have not had enough sleep
or have a hangover.
CAUTION – Before using this watch for diving –
When using this watch, the user must receive general training and instructions, and
follow various rules.
The user should not use this watch without a good knowledge and understanding of
the proper way to handle and operate it and the precautions on it. If this watch is
improperly used, it may result in malfunction or breakdown of the watch.
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CAUTION – For safe diving –
• When diving, obey the rules of the buddy system every time. (Buddy system means
that two divers pair with each other for safe diving.)
• For safety, it is advised that you enjoy sports diving in the depths around 20 m (60
ft).
• Before diving with this watch, fully charge the watch without fail. When the watch is
not sufficiently charged (the function hand points at “NG”), the depth meter function
cannot be used.
If charge of the watch becomes low considerably during diving, the depth meter
function to measure depth is discontinued.
• After diving, take a good rest following safety rules. If you take a plane or move to a
high place without a sufficient rest after diving, you may suffer from decompression
sickness (caisson disease).
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PROHIBITION
Do not use this watch for diving under the following circumstances.
• When the function hand indicates “NG” on the charging level index.
… When the function hand indicates “NG” on the charging level, the watch will not
measure the depth. If the function hand points at “NG” on the charging level during
diving, immediately stop using the depth meter function of the watch since the
watch discontinues depth measurement in this condition.
• When the watch stops running or malfunctions. (Be careful not to knock the watch
against hard things such as diving apparatus, rocks, etc.)
• When the water temperature is out of the guaranteed range for measuring depth.
… The accuracy of the depth meter function is guaranteed under the condition that
water temperature is between +10°C and +40°C (50°F and 104°F).
• For the purpose of knowing a risk of a behaviour or situation.
…This watch is not designed to serve as a drowning prevention instrument or an
emergency instrument.
• In the environment filled with helium gas (saturated diving, etc.).
…Use of the watch in such conditions may cause failure or breakdown of the
watch.
–Circumstances that prohibit use of this watch
in diving –
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