Citizen 9051 User manual

INSTRUCTION MANUAL

English

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 https://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.

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

) 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

English

■ 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

Precautions to be taken when diving

PROHIBITED Do not use this watch while diving when...

CAUTION Diving with the watch

• Do not use your watch while diving when the watch stops or exhibits any

abnormal operation.

• Persons using the diver’s watch are strongly recommended to receive proper

instruction and training pertaining to diving and observe those rules at all times.

• Please use this watch properly only after you fully understand the operating

procedures and cautions.

Using this watch other than as indicated in this instruction manual may result in

failure of the watch to function properly.

• Check the water-resistant indications on the watch face or the case back. Never

dive beyond the indicated depth.

English

Safety precautions

CAUTION Before diving

CAUTION During diving

CAUTION After diving

• Check items below before diving

- Make sure that the mainspring is fully wounded

- Make sure that the watch is running correctly (check the movements of the

time/calendar/second hand)

- Make sure that the crown is fully pushed in and its screw is tighten firmly

- Make sure that the band is firmly anchored to the watch body.

- Make sure that there are no cracks or other damage to the watch band or the

glass face.

- Make sure that the register ring rotates properly.

• Do not operate the crown in the water. Operating any of them in water may cause

trouble including deterioration of water resistance.

• Be careful not to hit the watch against hard objects such as equipment or rocks.

• Check to see if the crown is pushed in and locked before removing the sea water,

dirt, and sand attached to the watch with fresh water. Then, wipe the fresh water.

CONTENTS

Characteristics of Mechanical watches .......................

Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Before using this watch .................................

Component identification ...............................

Mainspring ............................................

Adjusting the time and calendar ..........................

Using the rotating bezel .................................

Water resistance .......................................

Precautionary items and usage limitations.................

Specifications ..........................................

English

Characteristics of Mechanical watches

About time accuracy of mechanical watches

The time accuracy described on this instruction manual is the static accuracy

at normal temperature. The accuracy of mechanical watches may get out of the

described range depending on the following three usage conditions or other reasons.

• Winding amount of the mainspring

• Attitude

• Usage environment (temperature, magnetism, impact, etc.)

Winding amount of the mainspring

Mechanical watches keep accuracy

most stably when the mainspring is

sufficiently wound.

Attitude

Accuracy of mechanical watches varies

affected by gravity. The accuracy varies

as the result that may take various

attitude while worn and gravitate to a

different direction every moment.

Usage environment (temperature, magnetism, impact, etc.)

• Metal parts are used for the part for keeping accuracy in mechanical watch. The

accuracy varies affected by their thermal expansion and contraction.

• Metal parts are used in mechanical watches. Magnetism affects them and

accuracy of the watches in consequence. Do not bring them close to things which

have or generate strong magnetism.

• Strong shocks may also affect the accuracy.

Maintenance

Mechanical watches may become inaccurate due to insufficient lubrication or worn

parts. Have the watch disassembled and cleaned (overhaul) every 2-3 years (charge

basis). It may be difficult to restore the watch from degradation after long-term use

to its initial performance even after repairs.

Characteristics of Mechanical watches

English

Features

■

Water-resistant to 200m

• This watch is a SCUBA diver’s watch (water-resistant to 200m). You can use it

for SCUBA diving with air tanks, but must not be used in a helium-enriched

atmosphere (e.g. saturation diving).

■

Automatic winding movement

• A automatic winding movement is employed in which the watch mainspring

is wound automatically by movement of the hand when worn, and the force of

the mainspring is then used to drive the movement (watch).

[Automatic winding]

When worn on the wrist, the normal movement of the arm will wind the mainspring.

[Manual winding]

Rotate the crown clockwise while it is in position to wind the mainspring.

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