Citizen 8203B User manual

Package Contents
Once you have opened the package, first check whether the following product and
accessories are contained in the package.
Watch
Extension band
Instruction manual
Rotating bezel spring (spare)
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Request to Customers
All repairs performed on this watch, including repairs involving the
band, are to be performed at the CITIZEN. When desiring to have your
watch repaired or inspected, place contact the Citizen Service Center
either directly or through the store where you purchased your watch.

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1. Features of the Citizen Promaster 1000 m Professional Diver
This watch is a diver’s watch designed to withstand depths down to 1000 m (water
pressure equivalent to 100 atm).
1. Titanium Case Offering Outstanding Features
* The watch case employs a titanium base offering superior corrosion resistance,
light weight and high strength, while the surface is specially treated for high
hardness and enhanced scratch resistance.
2. Water Resistant Construction Capable of Withstanding a Depth of 1000 m
* This watch features enhanced water resistance that enables it to withstand
saturation diving by using helium gas.
3. Equipped with an Helium Escape Valve for Discharging Helium Gas
* This watch employs an helium escape valve for enhanced safety that automatically
discharges helium gas that has penetrated inside the watch when ascending from
deep regions to the surface.
Contents
1. Features of the Citizen Promaster 1000 m Professional Diver ........... 5
2. Names of Components ............................................................................ 7
3. Before Using ............................................................................................. 8
4. Setting the Time and Date ..................................................................... 10
1. Setting the Time ................................................................................. 10
2. Setting the Date .................................................................................. 11
5. Helium Escape Valve ............................................................................. 13
6. Using the Rotating Bezel ....................................................................... 14
7. Before Diving .......................................................................................... 16
8. Cautions While Diving ........................................................................... 17
9. Maintenance After Diving ...................................................................... 18
10. Disassembly and Assembly of Rotating Bezel and Rotating Bezel
Clamp ...................................................................................................... 19
11 Handling .................................................................................................. 25
12. Precautions ............................................................................................ 26
13. Specifications ......................................................................................... 31
English

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2. Names of Components
Rotating bezel clamp
Screw down locking crown
Rotating bezel clamp
locking lever
Hour hand
Rotating bezel
Helium escape valve
Minute hand
Second hand
The design may vary depending on the model.
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4. Rotating Bezel with Reverse Rotation Prevention Mechanism to Prevent
Incorrect Operation
* The rotating bezel, which is important for checking diving time, employs a reverse
rotation prevention mechanism that prevents the rotating bezel from being rotated
inadvertently.
5. Rotating Bezel can be Disassembled and Assembled
* The rotating bezel can be easily disassembled for cleaning when debris and dirt
have become trapped inside. A locking lever is used that enables the rotating
bezel to be securely fastened after assembly.
6. Screw down locking Crown
* The screw down locking crown can be securely locked in position through the use
of a screw-locking mechanism. What is more, the use of double O-rings results in
enhanced airtightness and water resistance. Furthermore, the screw down locking
crown is located at the 9:00 position to prevent it from obstructing movement of
the wrist or wetsuit.
7. Self-Winding Movement
* A self-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). The mainspring can also
be wound by turning the crown.

3. Before Using
This watch is a mechanical watch (self-winding). Before using, disengage the screw
down locking crown and turn it to the right by hand to wind the watch mainspring.
When the mainspring is in the fully wound state (sufficiently wound), the watch will
continue to run for about 40 hours. In order to ensure that the watch continuously
provides a stable time display, always wear the watch
on your wrist to keep the mainspring adequately
wound. If the watch is only worn for short periods of
time, wind the mainspring manually by turning the
crown by hand.
Note:
A screw down locking crown is employed to enhance
the water resistance of the watch. When operating the
crown, first turn it to the left to disengage the screw
lock. Once you have finished operating the crown,
always make sure to return the crown to the normal
position and then turn it to the right while pushing it in
so that the screw lock is securely engaged.
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[General Reference for Winding Mainspring when Completely
Unwound]
* After first loosening the screw down locking crown, turn it to the right about 40
revolutions to fully wind the mainspring.
Keep the mainspring adequately wound either by turning the crown by hand or by
wearing the watch on your wrist for at least three hours each day.
If the watch is only worn for short periods of time, turn the crown by hand to keep the
mainspring fully wound. Since this watch employs a slip mechanism that automatically
disengages the mainspring when fully wound, it cannot be over-wound.
Disengage
screw-lock

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2. Setting the Date
(1) Turn the crown to the left to loosen the screw down lock.
(2) Pull the crown out to the first click.
(3) Turn the crown to set the date and day (rapid
correction).
* The date changes if the crown is turned to the
left.
* The day changes if the crown is turned to the
right.
The day is alternately displayed in two
languages. Once the day has been set to the
desired display, the watch automatically
displays the specified display.
(4) Push in the crown to the normal position.
(5) Turn the crown to the right while pushing in until
it stops to securely fasten the screw lock.
4. Setting the Time and Date
1. Setting the Time
(1) Turn the crown to the left to loosen the screw down lock.
(2) Pull the crown out to the second click.
* The second hand does not stop moving.
(3) Turn the crown to set the hands (time). If the date
changes, the time is around 12:00 AM. The day
changes about 4-5 hours later.
* Pay attention to AM and PM when setting the
time.
(4) Push in the crown to the normal position.
(5) Turn the crown to the right while pushing in until
it stops to securely fasten the screw lock.
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Time setting
position
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Date/day setting position
Day rapid
correction
Date
rapid
correction

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5. Helium Escape Valve
An helium escape valve is provided that automatically discharges helium gas that has
penetrated inside the watch to prevent the watch from rupturing when ascending from
deep regions to the surface during saturation diving by professional divers using
helium.
Notes:
* Avoid rapid correction of the date when the watch hands are between the hours of
9:00 PM and 4:30 AM. Correcting the date during this time period may prevent the
date from changing on the following day. Set the date and day after the hands have
moved outside this time period.
* This date displayed by this watch is based on a 31-day month. The date must be
changed by operating the crown on the first day of the following month in those
months with less than 31 days (months having 30 days and February).

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Determination of Remaining Time
* The remaining time can be determined by
aligning the
▼ mark on the rotating bezel
with the target time.
6. Using the Rotating Bezel
The rotating bezel can be used as a reference for elapsed time during diving or for the
amount of time remaining relative to a predetermined amount of time.
[Setting the Rotating Bezel]
* Only turn the rotating bezel to the left. It cannot be rotated in the opposite direction
(to the right) to prevent the risk of incorrect operation.
* Align the
▼ mark on the rotating bezel
with the minute hand. After a certain
amount of time has elapsed, the elapsed
time can be determined from the scale on
the rotating bezel.
Turning
direction
Elapsed time
Remaining time
Determination of Elapsed Time

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8. Cautions While Diving
1. Never operate the crown while diving.
2. Do not disengage the rotating bezel clamp locking lever while diving.
3. Never attempt to disassemble or assemble the rotating bezel or rotating bezel clamp
while diving.
4. Do not bump the watch against rocks or other hard objects.
7. Before Diving
Always make sure to check the following items before diving.
1. Is the watch mainspring sufficiently wound?
2. Is the time set correctly?
3. Is the watch crown securely fastened?
4. Does the rotating bezel rotate properly?
5. Are the rotating bezel and rotating bezel clamp properly assembled?
6. Is the rotating bezel clamp locking lever properly fastened?
7. Is the band securely attached?
8. Are there any scratches, cracks or chips in the glass?

10. Disassembly and Assembly of Rotating
Bezel and Rotating Bezel Clamp
[Exploded View of Rotating
Bezel and Related Parts]
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* Only disassemble the rotating
bezel when necessary. Be
careful not to lose or deform
any of the parts during
disassembly.
Rotating bezel clamp
Rotating bezel
Rotating bezel spring
Stopper
Rotating bezel clamp
locking lever
9. Maintenance After Diving
1. After diving, thoroughly rinse the watch with pure water and carefully wipe off the
moisture with a dry cloth. When rinsing with water, first check to make sure that the
crown is securely locked.
2. If there is any debris or fine sand around the rotating bezel, disassemble the rotating
bezel and rotating bezel clamp and remove any debris and soiling. However, never
attempt to loosen or remove the screws of the back cover.

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2. Turn the rotating bezel clamp to the
right and remove (this is opposite
the direction of an ordinary screw).
Note: Be careful when removing the
rotating bezel clamp since the rotating
bezel and rotating bezel spring may fall
off and become lost.
3. Lift the rotating bezel straight up and
remove.
Note: The rotating bezel spring is
installed beneath the rotating bezel.
Turning the rotating bezel while removing
can cause this spring to be deformed.
[Disassembly Procedure]
1. Open the rotating bezel clamp lever in
the direction of the arrow while
simultaneously lowering the stopper.
4. Remove the rotating bezel spring.
Note: Projections at two locations on the
spring are press fit into holes on the top
of the watch to prevent it from falling out
easily. Remove the rotating bezel while
being sufficiently careful not to deform
these projections.