Citizen CTZ-6748 User manual

INSTRUCTIONS FOR
CITIZEN DIVER’S WATCH
AUTOMATIC DAY/DATE
MODEL No. NYO XXX
Cal. No. 8203
CTZ-6748
CITIZEN DIVER’S WATCH (200m) features
• Register-ring with malfunctioning preventive
locking mechanism.
This is a diver’s watch designed to be useful under
200 metres deep. It has features as follows.
• Screw lock type crown with double O-ring
The watch has a double O-ring type screw lock crown
with waterproof packings, to improve airtightness and
water resistance.
• The “No decompression limits table’’ imprinted
on the wrist band.
The “No decompression limits table” is printed on the
wrist band to enable divers to dive safely. (Their are
some models without this table.)
Specifications
1. Type Automatic-mechanical watch
(with a centre second)
2. Caliber No. 8203
3. Calendar Date (with quick setting device)
4. Water resistance 200m water resistant watch
Setting the watch
According to the model, the crown may be positioned
differently from the illustrations shown, however the
operation is the same.
1. STARTING THE WATCH
*This watch has an excellent self-winding mechanism
that winds the mainspring with a light motion of your
wrist. However, to obtain best performance, it is
recommended that the crown be wound manually 5 to
10 times further or give a shock slightly to the watch.
2. SETTING THE WATCH
The crown of this watch is screwlock type and must
first be turned counterclockwise to loosen it.
*Do not operate the crown in water or while the watch
is wet
<Setting the time>
1. Pull out the crown to the position (2) and then
advance the hands.
The date will change at about 12 o’clock.
This 12 o’clock indicates “midnight”
2. Adjust hour/minute hand by turning the crown in
consideration of a.m. and p.m.
<Setting the calendar>
a. Pull out the crown to position (1)
b. Turn the crown clockwise until the desired day of
the week appears.
Turn the crown counter clockwise until the desired
date appears.
*Do not set the date and day between 9.00PM and
4.00AM otherwise the date and day may not
change properly.
After the time and calendar have been set, be sure to
push the crown to the position (0) and lock it by
screwing.
How to use Register Ring
The register ring is a convenient way to keep track of
diving time, permitting the indication of the elapsed
and remaining times.
*Turn the register ring counter clockwise while pushing
it. It is locked under normal conditions to prevent free
rotation, and cannot be turned in the reverse direction
for safety reasons.
*Determination of elapsed time: Preset the mark on
the register ring to the minute hand, and the elapsed
time can be shown by the register ring scale.
*Determination of remaining time: Preset the mark on
the register ring to a certain required time, and the
remaining time can be read with the ring scale.
No Decompression limits table
If you have purchased a watch with the “No
decompression limits table” on the band please follow
the next instructions.
• The no decompression limits table which is based on
the U.S. Navy Diving Manual is imprinted on the wrist
band of some models.
• The table indicates the permitted time limit without
decompression according to the depth.
Elapsed time: shows that
10 minutes have passed
since 9:10
Remaining time: shows that
15 minutes remain until 9:25,
the settled time.

CAUTION
The No decompression limits table
attached to the watch is for supple-
mentary information purposes only
and should not be relied upon in any
situation in which the health or
safety of the diving is at risk. The No
decompression limits table of the
watch does not contain all
information necessary to ensure
proper decompression.
For example:
Decompression is not needed when diving depth is
21 metres and the elapsed time is less than 50 minutes.
Use Precautions
1. Water resistant
The crown must be pushed in at all times.Also on
screwlock-type crowns, screw should be tightened
completely.
• Do not operate the crown in the water or while the
watch is wet.
• Clouding of glass
Since there is some moisture in a watch, if the
outside temperature is lower than inside the watch,
the glass may get fogged. If the fog clears soon, it is
not a problem. If it does not clear soon, however,
have it checked immediately.
2. Protective Packings
• Packings incorporated in this watch (for its
caseback, crown and glass) prevent entering of
water, dust and other foreign matters into the watch
to protect its functions. Periodical replacement of
these packings (every 2 years approximately) is
recommended since they may become subject to
brittleness and/or their elasticity may decrease after
a long-time use.
3. Use for diving
Be sure to check the following points when you use
this watch for diving.
a. Before diving
• The time has been properly set.
• The crown is properly in lock position.
• The register ring properly rotates counter-clockwise.
It does not rotate clockwise (never force to rotate it at
this time).
• There are no scratches in the wrist band and no
cracks nor chipped portions in glass of the watch.
Also, the band should be fastened tightly to the
watch case.
• For any irregularity found immediately contact the
store where you purchesed the watch or an
authorized Citizen Dealer.
b. During Diving
• Be sure not to operate the crown in water or when
the watch is wet.
• Be careful not to drop or hit the watch against a
rock or other hard items.
c. After Diving
• Wash the watch with fresh water to prevent rust
formation due to sea water.
• Wipe off water droplets adhering to the watch after
washing.
4. Avoid strong shock
This watch will withstand the bumps and jars normally
incurred while playing and during sports activities.
Avoid dropping your watch on the ground or
otherwise imparting severe shock to it.
5. Avoid strong chemicals, solvents and gases
Avoid wearing your watch in the presence of strong
chemicals, solvents and gases. If your watch comes
in contact with materials such as gasoline, benzine,
paint thinner, alcohol, spray cosmetics, nail polish
remover, adhesives or paint, discoloration,
deterioration or damage to the case, band and other
components may occur.
Indication Water-related use
Dial Case back
Against occasional Using it for Kitchen Using it skin . Using it scuba Using in a saturated Pulling out the
water drops to work, swimming, diving diving diving (helium gas) crown when the
which it may be washing a car, environment such watch is wet.
temporarily boating or water as used for
subjected. skiing. professional diving.
WATER Water WATER WATER
RESISTANT resistant RESISTANT RESISTANT OK OK OK OK NO NO
200m for diving 200m

6. Keep your watch clean
It may become difficult to pull out the crown due to dirt
and dust getting caught between the crown and the
watch case when the watch is worn for long periods of
time. To help prevent this from happening, turn the
crown freely back and forth occasionally while it is in
the normal set position.
Wipe off any water and moisture that adheres to the
case, glass and band with a soft, clean cloth.Any dirt
left on the case or band may cause skin rash.
Awatchband will easily become soiled with dust and
perspiration because it is in direct contact with the
skin. Even a stainless or gold-plated band may begin
to corrode if it has not been cleaned for a long period
of time.
Metal watchbands are usually washed with a brush in
mild, soapy water and well wiped with a soft,
absorbent cloth to make sure all water is removed.
Pay attention to prevent any water from getting inside
your watch when the band is washed.
7. Periodic inspection
Getting your watch checked once every year or two is
recommended to ensure long use and trouble-free
operation.
8. Luminous Paint
Being a diver’s watch, luminous paint is used for this
diver’s watch (200m).
200m to facilitate time readability in a dark place. This
luminous paint contains a trace quantity of radioactive
substance pursuant to ISO safety standard. There is
no problem for normal use; however, in the event that
the watch glass has been damaged or broken,
immediately carry it to the store where you purchased
or to an authorized Citizen Dealer.