SEIKO 8R46 Mechanical Chronograph Smartwatch Instructions

8R46 / 8R48
MECHANICAL CHRONOGRAPH
INSTRUCTIONS

Please refer to the Instruction Manuals of other languages by accessing “Customer Service”→ “Instruction” on our Website from PC or Smartphone. https://www.seikowatches.com/

Thank you very much for choosing a SEIKO watch. For proper and safe use of your SEIKO watch,
please read carefully the instructions in this booklet before using it.

Keep this manual handy for easy reference.

• Length adjustment service for metallic bands is available at the retailer from whom the watch was purchased. If you cannot have your watch repaired by the retailer from whom the watch was purchased because you received the watch as a gift, or you moved to a distant place, please contact SEIKO CUSTOMER SERVICE CENTER. The service may also be available on a chargeable basis at other retailers, however, some retailers may not undertake the service.
• If your watch has a protective film for preventing scratches, make sure to peel it off before using the watch. If the watch is used with the film on it, dirt, sweat, dust, or moisture may be attached to the film and may cause rust.

HOW TO USE

Handling cautions

WARNING
Please note that there is a risk of serious consequences such as severe injury if the following safety regulations are not strictly observed.

Immediately stop wearing the watch in following cases:

• If the watch body or band becomes edged by corrosion etc.
• If the pins protrude from the band.
• Immediately consult the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER.

Keep the watch and accessories out of the reach of babies and children.
Care should be taken to prevent a baby or a child from accidentally swallowing the accessories.
If a baby or child swallows the battery or accessories, immediately consult a doctor, as it will be harmful to the health of the baby or child.

CAUTION

Please note that there is a risk of minor injury or material damage if the following safety regulations are not strictly observed.

Avoid the following places for wearing or keeping the watch:

• Places where volatile agents (cosmetics such as polish remover, bug repellent, thinners etc.) are vaporizing
• Places where the temperature drops below 5°C or rises above 35°C for a long time
• Places affected by strong magnetism or static electricity
• Places affected by strong vibrations
• Places of high humidity
• Dusty places

If you observe any allergic symptoms or skin irritation
Stop wearing the watch immediately and consult a specialist such as a dermatologist or an allergist.

Other cautions

• For adjusting the length of the metallic band, specialized knowledge and expertise are necessary. Therefore, in such a case, contact the retailer from whom the watch was purchased. If you attempt to adjust the metallic band, injury may occur to your hand or fingers, or parts of the band may be lost.
• Do not disassemble or tamper with the watch.
• Keep the watch out of the reach of babies and children. Extra care should be taken to avoid risks of any injury or allergic rash or itching that may be caused when they touch the watch.
• If your watch is of the fob or pendant type, the strap or chain attached to the watch may damage your clothes, or injure the hand, neck, or other parts of your body.

WARNING
Do not use the watch in scuba diving or saturation diving.
The various tightened inspections under simulated harsh environment, which are usually required for watches designed for scuba diving or saturation diving, have not been  conducted on the water resistant watch with the BAR (barometric pressure) display. For diving, use watches specifically designed for diving.

CAUTION
Do not pour running water directly from faucet.
The water pressure of tap water from a faucet is high enough to degrade the water
resistant performance of a water-resistant watch for everyday life.

CAUTION
Please note that there is a risk of minor injury or material damage if the following safety regulations are not strictly observed.

Do not turn or pull out the crown when the watch is wet.
Water may get inside of the watch.

• If the inner surface of the glass is clouded with condensation or water droplets appear inside of the watch for a long time, the water-resistant performance of the watch has deteriorated. Immediately consult the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER.

Do not leave moisture, sweat, and dirt on the watch for a long time.
Be aware of a risk that a water-resistant watch may lessen its water-resistant performance because of deterioration of the adhesive on the glass or gasket, or
the development of rust on stainless steel.

Do not wear the watch while taking a bath or a sauna.

Steam, soap, or some components of a hot spring may accelerate the deterioration of the water-resistant performance of the watch.

Mechanical watch characteristics (Hand-wound, auto-wound)

• This is a mechanical watch powered by a spring.
• To use it from a stopped state, turn the crown 20 turns by hand to wind up the spring before starting the watch.
• Although the accuracy of quartz watches is measured in differences over months or years, in mechanical watches it is measured in differences per day (i.e., the amount the watch speeds up or slows down in a single day).
• Additionally, mechanical watches are subtly affected by the conditions in which they are used (e.g., duration worn, temperature, arm movement, the amount wound, etc.) ; thus, the amount of error is not constant.
• When affected by a strong magnetism from outside, a mechanical watch may lose/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.

Names of the parts and their functions

Start/stop of the stopwatch
3. Stopwatch minute hand (Measures up to 30 minutes)| 8. Crown
• Normal position (not locked): Wind up the watch (hand-wound)
• First click position: Time difference adjustment/Date setting
• Second click position: Time setting
4. Stopwatch hour hand (Measures up to 12 hours)  (8R48 only)| 9. Button B
Reset of the stopwatch
5. Small seconds hand| 10. Date

• The position and design of the display may vary depending on the model.

Crown

There are two types of crowns, a normal crown and a screw down crown. Please check the type of the crown of your watch.

• By locking the crown by screw, a screw down crown can prevent malfunction and increase water resistance.
• Be careful not to screw the crown in by force as it may damage the slots of the crown.

Screw lock type button

The screw lock type button features a mechanism that can securely lock the button when it is not being operated in order to prevent any operational errors.

• It is necessary to unlock the screw lock type button before operating it.

• Once you have finished operating the button, make sure to relock it.
  【To unlock the button 】

• Turn the button ring counterclockwise until it stops.

• Now the button can be operated.
  【To lock the button 】

• Turn the button ring clockwise until it stops.

• Now the button can no longer be operated.
  * If the screw or button get dirty, they may not operate properly. “Daily care” → P.23

• Note that if you turn the button ring more than you need to, the screw lock button may be difficult to return to its original position.

• Do not use the buttons when the watch is wet or when you are underwater.

How to wind the mainspring

• This is an automatic mechanical watch with a manual winding mechanism.
• When the watch is worn on the wrist, the mainspring is wound automatically through normal wrist movement. The watch can also be wound up by turning the crown.
• To start the watch after it stops completely, winds it up either by turning the crown or swinging it from side to side until the small seconds hand starts moving. Then, set the time and date before putting the watch on the wrist. To wind up the watch, turn the crown clockwise slowly. The watch cannot be wound by turning the crown counterclockwise. In this way, the watch can be wound up fully. Furthermore, turning the crown further will not break the spring. * For the watch with a screw-down crown, please unlock the crown before operating it and be sure to lock the crown after operating it.
• Once the watch is wound up fully, it operates for about 45 hours. * While the chronograph is used to measure a long period of time, however, the watch will stop operating before 45 hours.
• If the watch is used without being wound up fully, gain or loss of time may result. To avoid this, wear the watch for more than 10 hours a day. If the watch is used without being worn on the wrist, be sure to wind it up fully every day at a fixed time.
• If you use a watch that has stopped with the mainspring unwound, winding the mainspring with the crown will not start the watch immediately. That is because the mainspring torque or force is low at the beginning of its winding due to the characteristics of mechanical watches. The small second’s hand will start to move when a certain degree of torque is reached after the mainspring has been wound up. However, swinging the watch from side to side to forcibly turn the balance can start the watch sooner.

HOW TO SET THE TIME AND DATE

How to set the time and date

The watch is provided with a date function and is so designed that the date changes once every 24 hours.
The date changes around 12 o’clock midnight. If AM/PM is not properly set, the date will change at 12 o’clock noon.

CAUTION
Do not amend the date when the watch is displaying between 8 PM and 2 AM.
Amending the date during this time period may cause problems such as the date failing to change the next day.

1. Pull out the crown to the first click.

• For models with screw down crown, please unlock the crown before operating it.
  Pull out the crown to the first click

  2. The date can be set by turning the crown.
     Turn it until the previous day’s date appears.
     Ex.) To display the date as “6,” then set this to “5.” Turn the crown to the left (counterclockwise) to set the date.

  3. Pull out the crown to the second click and set the time.
     Pull out the crown to the second click when the small second’s hand is at the 12 o’clock position; the small seconds hand stops on the spot. Turn the crown to advance the hands until the date changes to the next. The time is now set for the A.M. period. Advance the hands to set the correct time.
     

  4. Push the crown back into the normal position in accordance with a time signal.
     The small second’s hand will start moving.

• The telephone time signal service is helpful for setting the small seconds hand exactly.

• For models with screw-down crown, please be sure to lock the crown after operating it.

CAUTION
The mechanism of mechanical watches is different from that of quartz watches.
When setting the time, be sure to turn back the minute hand a little behind the desired time and then advance it to the exact time.

■ Date adjustment at the end of the month
It is necessary to adjust the date to the end of February and 30-day months.
Ex.) To adjust the date in the A.M. period on the first day of a month following a 30-day month
The watch displays “31” instead of “1.” Pull out the crown to the first click.
Turn the crown counterclockwise to set the date to “1” and then push the crown back into the normal position.

• For models with screw-down crown, please be sure to lock the crown after operating it.

Pull out the crown to the first click

CAUTION
• Avoid amending the date when the watch is displaying between 8 PM and 2 AM. Doing so may cause damage.

HOW TO USE THE CHRONOGRAPH

How to use the chronograph

The chronograph can measure up to 30 minutes (for 8R46) or 12 hours (for 8R48).

• “Chronograph” refers to a watch function that measures the elapsed time while indicating the current time.
• Please do not pull out the crown to adjust the time/date while the stopwatch is in operation.
• Before using the stopwatch, be sure to check that the center stopwatch hand is at “0” position. If not, press button B to reset it to “0” position.
• Before using the stopwatch, be sure to check that the watch is wound up sufficiently. If the power reserve indicator indicates less than 10 hours of power reserve,
  the stopwatch cannot be used.

1. Center stopwatch seconds hand| 4. Button A
Start/Stop
---|---
2. Stopwatch minute hand (Measures
up to 30 minutes)| 5. Button B
Reset of the stopwatch
3. Stopwatch hour hand (Measures up
to 12 hours) (8R48 only)| 6. Tachymeter → P.21

• The position of the tachymeter display may differ depending on the design of the model.

How to use the stopwatch

• Standard measurement Ex. 5,000 meters running
• Accumulated elapsed time measurement Ex. Measuring the time for a soccer match

■ How to read the stopwatch minute hand
For 8R48, which can measure up to 12 hours, the stopwatch minute hand makes a full rotation every 30 minutes.
The readout is determined by the correlation between the positions of the stopwatch minute hand and the stopwatch hour hand. To read the minutes correctly, refer to the instructions below.’

(Between 0 and 29 minutes)

• For 8R46 Read the time that the stopwatch minute hand is pointing to as is; in the case above, the measured time should be read as “20 minutes 10 seconds”.
• For 8R48 While the stopwatch hour hand is pointing in some direction within the first half of an hour (after a long line of graduation and before a short line of graduation), read the minutes as is that the minute hand is pointing to; in the case above, the measured time should be read as “6 hours 20 minutes 10 seconds”.

(Between 30 and 59 minutes)

While the stopwatch hour hand is pointing in some direction within the second half of an hour (after a short line of graduation and before a long line of graduation), add 30 minutes to the minute that the minute hand is pointing: in the case above, the measured time should be read as “6 hours 50 minutes 10 seconds”.

How to use the tachymeter

The numbers on the tachymeter scale can be read to determine how many seconds it takes to run 1 km or to measure the time required to complete 1 job.
• How to measure kilometers/hour

1. Measure the time (within 1 minute) it takes to run 1 km.
2. Read the tachymeter scale where the center stopwatch seconds hand points.
   Ex. : If it takes 45 seconds to run 1 km…80 km/h
   

• How to measure the hourly rate of operation

1. Measure the time (within 1 minute) required to complete 1 job.
2. Read the tachymeter scale where the center stopwatch seconds hand points.
   Ex. : If it takes 20 seconds to complete one product…180 products/hour
   

TO PRESERVE THE QUALITY OF YOUR WATCH

Daily care

● The watch requires good daily care

• Do not wash the watch when its crown is in the extended position.
• Wipe away moisture, sweat or dirt with a soft cloth.
• After soaking the watch in seawater, be sure to wash the watch in clean pure water and wipe it dry carefully.
  Do not pour running water directly from a faucet onto the watch. Put some water into a bowl first, and then soak the watch in the water to wash it.
• If your watch is rated as “Non-water resistant” or “water-resistant for daily use,” please do not wash the watch.
  “Performance and type” → P.24
  “Water-resistant performance” → P.26

● Turn the crown from time to time

• In order to prevent corrosion of the crown, turn the crown from time to time.

The same practice should be applied to a screw-down crown.
“Crown” → P.9
● Press the button once in a while

• Press the button once in a while to prevent corrosion of the button.

Performance and type

The case back shows the caliber and performance of your watch

• Water resistant performance
Please refer to P.26.
• Case Number
The number to identify the type of your watch.
• Magnetic resistant performance
Please refer to P.27 and P.28.
• Magnetic resistant performance
Please refer to P.27 and P.28.

• The above illustration is provided as an example, therefore it may not be exactly the same as your watch.

Lumibrite

If your watch has Lumibrite
Lumibrite is a luminous paint that absorbs the light energy of sunlight and lighting apparatuses 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 3 to 5 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. In general, when coming from a place that is bright to a place that is dark, it takes human eyes some time to adapt to the darkness making it difficult to see objects initially. (Dark adaptation) Lumibrite is luminous paint that stores and emits light, which is harmless to human beings and the environment, containing no toxic materials such as radioactive substances.