Prospex SLA025J1 - Montre-bracelet SEIKO - Free user manual and instructions

Product Type	Wristwatch
Brand	Seiko
Model	Prospex SLA025J1
Movement	Mechanical automatic (self-winding with manual winding mechanism, Caliber 8L35)
Power Reserve	Approximately 50 hours
Frequency	28,800 vibrations per hour
Jewels	26 jewels
Accuracy (Daily Rate)	Between +15 and -10 seconds at normal temperature range (5°C to 35°C)
Functions	Hour, minute, second hands; date display; rotating bezel for elapsed time
Rotating Bezel	Unidirectional counterclockwise rotation with clicks (half-minute increments); shows elapsed time up to 60 minutes
Crown	Screw-lock type; must be unscrewed before operation
Crystal	Not specified (assumed scratch-resistant sapphire or mineral)
Luminous Material	LumiBrite (absorbs light and glows in dark)
Water Resistance	Diver's watch (not specified depth, but suitable for scuba diving; not for saturation diving with helium gas)
Case Material	Not specified (assumed stainless steel)
Strap/Bracelet	Not specified (assumed silicone or steel)
Care Instructions	Rinse with fresh water after diving; wipe dry; periodic check every 2-3 years at authorized service center
Safety Precautions	Do not operate crown when wet; do not use for helium saturation diving; avoid strong magnetic fields and chemicals
Repair	Only authorized Seiko service centers should repair diver's watches

Frequently Asked Questions - Prospex SLA025J1 SEIKO

How do I start the watch if it has stopped completely?

Unlock the crown by turning it counterclockwise, then slowly turn the crown clockwise about 20 times to wind the mainspring. The second hand will start moving. After winding, lock the crown by turning it clockwise while pressing it in.

How do I set the time and date on the Seiko Prospex SLA025J1?

Unlock the crown and pull it out to the first click to set the date (turn clockwise until the previous day's date appears). Then pull to the second click (when the second hand is at 12) to set the time. Turn the hands to advance to the correct time, ensuring AM/PM by checking if the date changes. Push crown back in and lock it.

What is the rotating bezel used for and how does it work?

The rotating bezel measures elapsed time up to 60 minutes. Before diving, align the ▲ mark with the minute hand. As time passes, the minute hand points to the bezel's number indicating elapsed minutes. The bezel rotates only counterclockwise to prevent accidental shortening of measured time, and its rotation becomes harder in water for safety.

How should I care for the watch after diving?

Rinse the watch thoroughly with fresh water to remove seawater, sand, or soil. Wipe it dry with a soft cloth to prevent rust. Avoid operating the crown while the watch is wet.

Can I use this watch for saturation diving with helium gas?

No, this watch is not designed for saturation diving using helium gas. Doing so may cause severe damage or personal injury.

What is the accuracy of the mechanical movement?

The daily rate accuracy is between +15 and -10 seconds at normal temperatures (5°C to 35°C). However, actual accuracy may vary depending on usage conditions such as wearing time, temperature, arm movement, and mainspring winding state.

How does LumiBrite work and how long does it glow?

LumiBrite absorbs light energy from sunlight or artificial light (e.g., 500 lux for 10 minutes) and stores it to emit light in the dark. It can glow for 5 to 8 hours after sufficient exposure, gradually decreasing over time. For dark dives, ensure the watch is fully charged or use an underwater flashlight.

What precautions should I take to avoid magnetism affecting the watch?

Keep the watch away from strong magnetic objects (e.g., speakers, magnets, MRI machines). Strong magnetism can temporarily gain/lose time or permanently magnetize parts, requiring demagnetization repair at an authorized service center.

How often should I have the watch serviced?

Seiko recommends a periodic check every 2 to 3 years at an authorized dealer or service center to ensure the case, crown, gasket, and crystal seal remain intact.

What should I do if the crown becomes hard to turn or the bezel doesn't rotate smoothly underwater?

Bezel rotation may become slightly stiffer underwater, which is normal and not a malfunction. If the crown or bezel feels abnormal on land, contact an authorized Seiko service center for inspection. Never attempt to repair it yourself.

USER MANUAL Prospex SLA025J1 SEIKO

INSTRUCTIONS (P. 35)

ISTRUZIONI (P. 51)

You are now the proud owner of a SEIKO Automatic Diver's Watch Cal.8L35/8L55. For best results, please read the instructions in this booklet carefully before using your SEIKO Automatic Diver's Watch. Please keep this manual handy for ready reference.

• Do not attempt to dive using this watch unless you have been properly trained in diving. For your safety, please abide by the rules of diving.
• Do not use the watch for saturation diving using helium gas.
  ● Before diving, make sure that the watch operates normally.

CAUTION

• Please read and observe the instructions described in this booklet to ensure the proper functioning of your diver's watch.
• Do not operate the crown when the watch is wet or in water.
  ● Avoid hitting the watch against hard objects such as rocks.

WARNING

WARNING notes indicate any condition or practice which, if not strictly observed, could result in severe personal injury or possible death.

CAUTION

CAUTION notes indicate any condition or practice which, if not strictly observed, may result in personal injury or property damage.

PRECAUTIONS ON USING THE WATCH FOR DIVING

Before diving, make sure that the watch operates normally and be sure to observe the precautions described below.

BEFORE DIVING

● Do not use the watch for saturation diving using helium gas

- Check that:

• the crown is locked tightly in place.

• there are no visible cracks in the crystal or the watch band

- the strap or bracelet is securely fastened to the watch case

- the buckle keeps the strap or bracelet firmly secured to the wrist

- the rotating bezel turns counterclockwise smoothly (the rotation must not be too loose or

too tight and the mark aligns with the minute hand.

- the time and duration are appropriately set. - t he second hard is operating normally (if not, swing the watch for more than 30 seconds to wind the mainspring sufficiently).

If there are any malfunctions, we recommend that you contact an AUTHORIZED SEIKO SERVICE CENTER.

WHILE DIVING

• Do not operate the crown when the watch is wet or in water.
  ● Take care not to hit the watch against hard objects such as rocks.
• Bezel rotation may become slightly stiffer underwater. This is not a malfunction.

AFTER DIVING

● Rinse the watch in fresh water after diving and wash out all seawater, soil, sand, etc.
● Wipe the watch thoroughly dry to prevent possible rust on the case after cleaning the watch in fresh water.

CONTENTS

Page

WARNING/CAUTION 3

PRECAUTIONS ON USING THE WATCH FOR DIVING 5

FEATURES 7

HOW TO START THE WATCH.... 11

TIME/CALENDAR SETTING 12

TO PRESERVE THE QUALITY OF YOUR WATCH 14

ACCURACY OF MECHANICAL WATCHES 17

SPECIFICATIONS 18

☆ For the care of your watch, see "TO PRESERVE THE QUALITY OF YOUR WATCH" in the attached Worldwide Guarantee and Instruction Booklet.

FEATURES

CHARACTERISTICS OF A MECHANICAL WATCH (self-winding type, automatic winding type)

● This mechanical watch operates using power obtained from a mainspring.
- If the watch is completely stopped, manually turn the crown approximately 20 times to wind up the mainspring to start the watch.
● While loss/gain of a quartz watch is indicated by a monthly or annual rate, accuracy of a mechanical watch is normally indicated by a daily rate (loss/gain per day).
- Normal usage accuracy of a mechanical watch varies according to conditions of use (time period that the watch is worn on the wrist, temperature environment, hand movement, and winding state of the mainspring).
- When the watch is affected by strong magnetism, it temporarily gains or loses time. If the watch encounters a strong magnetic field, the parts of the watch may be magnetized. In this case, repairs such as removal of magnetism are required. Contact the retailer from whom the watch was purchased.

Some models have the screw lock type crown, which can be locked by the screw when it is not necessary to be operated.
- Locking the crown will prevent operating errors.
● Unscrew the crown before any crown operation. When the operation is over, screw the crown in to lock.
■ HOW TO OPERATE THE SCREW LOCK TYPE CROWN
If your watch has a screw lock type crown, unscrew it before any crown operation.
Always keep the crown locked unless it is necessary for operating the crown.

[To unscrew the crown]

Turn the crown counterclockwise (downward) to unscrew it. The crown is unlocked and can be operated.

The crown can be pulled out.

[To screw the crown in]

Upon completion of the crown operation, screw the crown in completely until it stops by turning it clockwise (upward) while gently pressing it back into the original position.

Turn the crown while pressing it back in.

ROTATING BEZEL

The rotating bezel can show the elapsed time up to 60 minutes. By setting it before diving, you can know how many minutes you are underwater.

• To prevent accidental rotation, the rotating bezel is so designed that rotation becomes harder in water. Also for safety's sake, it roatates only counterclockwise, so that the time measured is never shorter than the actual elapsed time.
• Turn the rotating bezel to align its "mark with the minute hand. * The rotating bezel rotates with clicks. With each click, it turns half a minute.
• To know the elapsed time, read the number on the rotating bezel that the minute hand points to.

Example:

NAMES OF THE PARTS

a: Screwed-in position
b: Normal position
c: First click
d: Second click

HOW TO START THE WATCH

This watch is an automatic watch equipped with a manual winding mechanism.

To initially start your watch:

If your watch is completely stopped, it is recommended that you manually wind the mainspring by turning the crown.

How to manually wind the mainspring by turning the crown

1. Unlock the crown by turning it counterclockwise.
2. Slowly turn the crown clockwise to wind the mainspring.
3. Continue to turn the crown until the mainspring is sufficiently wound. The second hand will start moving.
4. Lock the crown by turning it clockwise while pressing it.

TIME/CALENDAR SETTING

1 Unlock the crown by turning it counterclockwise

2 Pull out the crown to the first click.

3 Turn the crown clockwise until the previous day's date appears.

4 Pull out the crown to the second click when the second hand is at the 12 o'clock position. (The second hand stops on the spot.)

5 Turn the crown to advance the hands until the date changes to the next. When it has changed, the time is set for the A.M. period. Keep advancing the hands to set the correct time.

6 Push back the crown in accordance with a time signal.

7 Lock the crown by turning it clockwise while pressing it.

*Do not change the day or the date between 9:00 p.m. and 1:00 a.m.

• Turn the hands past the 12 o'clock marker to determine whether the watch is set for the A.M. or P.M. period. If the calendar changes when the hour hand passes the 12 o'clock marker, the time is set for A.M. If the calendar does not change, the time is set for P.M.
• When setting the hands, first set them to a time a few minutes earlier than the correct time, and then advance them to the exact time.
• It is necessary to adjust the date on the first day after a month that has less than 31 days.

TO PRESERVE THE QUALITY OF YOUR WATCH

● Repair of diver's watches requires special expertise and equipment. If you find that your diver's watch is malfunctioning, therefore, never attempt to repair it but immediately send it to a nearby SEIKO Service Center.

TEMPERATURES

The key components in mechanical watches are made of metals, which expand or contract depending on temperatures due to metal properties. This exerts an effect on the accuracy of the watches. Mechanical watches tend to lose time at high temperatures while they tend to gain time at low temperatures.

MAGNETISM

Your watch will be adversely affected by strongmagnetism. Keep it away from close contact with magnetic objects.

CHEMICALS

Be careful not to expose the watch to solvents, mercury, cosmetic spray, detergents, adhesives or paints. Otherwise, the case, bracelet, etc. may become discolored, deteriorated or damaged.

■ PERIODIC CHECK

It is recommended that the watch be checked once every 2 to 3 years by an AUTHORIZED SEIKO DEALER or SER VICE CENTER to ensure that the case, crown, gasket and crystal seal remain intact.

■ CARE OF CASE AND BRACELET

To prevent possible rusting of the case and bracelet, wipe them periodically with a soft dry cloth.

Be careful not to drop your watch or hit it against hard surfaces.

■ PRECAUTION REGARDING CASE BACK PROTECTIVE FILM

If your watch has a protective film and/or a sticker on the case back, peel them off before using your watch.

LUMIBRITE™

LumiBrite is a luminous paint that is completely harmless to human beings and the natural environment, containing no noxious materials such as radioactive substances.

LumiBrite is a newly-developed luminous paint that absorbs the light energy of sunlight or artificial light in a short time and stores it to emit light in the dark.

For example, if exposed to a light of more than 500 lux for approximately 10 minutes, LumiBrite can emit light for 5 to 8 hours.

Please note, however, that, as LumiBrite emits the light it stores, the luminance level of the light decreases gradually over time. The duration of the emitted light may also differ slightly depending on such factors as the brightness of the place where the watch is exposed to light and the distance from the light source to the watch.

When you make a dive in dark water, LumiBrite may not emit light unless it has absorbed and stored light sufficiently.

Before diving, therefore, be sure to expose the watch to light under the conditions specified above, so that it fully absorbs and stores light energy. Otherwise, use the watch together with an underwater flashlight.

< Reference data on luminance >

(A) Sunlight

[Fire weather]: 100,000 lux [Cloudy weather]: 10,000 lux

(B) Indoor (Window side during daytime)

[Fine weather]: more than 3,000 lux [Cloudy weather]: 1,000 to 3,000 lux

|Rainy weather|: less than 1,000 lux

(C) Lighting apparatus (40-wall daylight fluorescent light)

|Distance to the watch: 1 m: 1,000 lux

[Distance to the watch: 3 m]: 500 lux (average room luminance)

[Distance to the watch: 4 m]: 250 lux

"LUMIBRITE" is a trademark of SEIKO HOLDINGS CORPORATION.

ACCURACY OF MECHANICAL WATCHES

The accuracy of mechanical watches is indicated by the daily rates of one week or so.

The accuracy of mechanical watches may not fall within the specified range of time accuracy because of loss/gain changes due to the conditions of use, such as the length of time during which the watch is worn on the wrist, arm movement, whether the mainspring is wound up fully or not, etc.

The key components in mechanical watches are made of metals which expand or contract depending on temperatures due to metal properties. This exerts an effect on the accuracy of the watches. Mechanical watches tend to lose time at high temperatures while they tend to gain time at low temperatures.

In order to improve accuracy, it is important to regularly supply energy to the balance that controls the speed of the gears. The driving force of the mainspring that powers mechanical watches varies between when it is fully wound and immediately before it is unwound. As the mainspring unwinds, the force weakens.

Relatively steady accuracy can be obtained by wearing the watch on the wrist frequently for the self-winding type and winding up the mainspring fully everyday at a fixed time to move it regularly for the wind-up mechanical type.

- When affected by external strong magnetism, a mechanical watch may loss/gain time temporarily. The parts of the watch may become magnetized depending on the extent of the effect. In such a case, consult the retailer from whom the watch was purchased since the watch requires repair, including demagnetizing.

SPECIFICATIONS

1 Features .... 3 hands, time display (Hour, minute and second hands) and date display

2 Vibrations per hour 8L35.... 28,800 8L55.... 36,000

3 Loss/gain (daily rate)...... Between +15 and - 10 seconds at normal temperature range (between 5 °C and 35 °C)

4 Continuous operating time 8L35..... Approximately 50 hours 8L55..... Approximately 55 hours

5 Driving system.... Automatic winding type with manual winding mechanism 6 Jewels 8L35.... 26 jewels 8L55.... 37 jewels

* The accuracy above is factory adjusted.

** Due to the characteristics of mechanical watches, any actual daily rate may not fall within the range of time accuracy specified above dependent on the conditions of use, such as the length of time during which the watch is worn on the wrist, temperature, arm movement, and whether the mainspring is wound up fully or not, etc.