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Inspection and adjustment by disassembly and cleaning (overhaul)
Periodic inspection and adjustment by disassembly and cleaning (overhaul) is recommended
approximately once every 2 to 3 years in order to maintain optimal performance of the watch for a long
time.
The power transmission gear of the movement of this watch constantly receives force. To ensure that
this mechanism works properly all the time, washing parts, changing oil, adjusting accuracy, checking
functions and replacing consumable parts on a regular basis are important. The first overhaul after the
purchase of your watch is particularly important for preserving long-time use of your watch. According
to use conditions, the oil retaining condition of your watch mechanical parts may deteriorate, abrasion
of the parts due to contamination of oil may advance or delay the time significantly, or the watch itself
may stop.
As the parts such as gasket may deteriorate, water resistant performance may be impaired due to
intrusion of perspiration and moisture.
Inspection and adjustment by disassembly and cleaning (overhaul) should be performed by the retailer
from whom the watch was purchased, and who specifies “SEIKO GENUINE PARTS.” At this time, also
request replacement of the gasket and the spring bar.
When your watch is inspected and adjusted by disassembly and cleaning (overhauled), the movement
of your watch may be replaced.
bCAUTION
Depending on the environment where a diver’s watch is used, its inner parts or movement
as well as its case or band may be affected. We recommend that you have your watch
overhauled regularly once every 2 or 3 years.
EN 37
2
TO PRESERVE THE QUALITY OF YOUR WATCH
Accuracy of mechanical watches
The accuracy of mechanical watches is indicated by the “daily rate.”
The accuracy of mechanical watches may not fall within the specified
range of time accuracy because loss/gain changes according to the
position of the watch, which is dependent on the conditions of use,
such as the length of time during which the watch is worn on the wrist,
arm movement, and whether the mainspring is wound up fully or not,
etc.
The loss/gain of mechanical watches is not measured by a daily rate,
but by daily rates of one week or so.
Accuracy variation according to temperature
The parts that compose the accuracy of mechanical watches are made of metals. It is well known that
metals 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.
EN 38
2
TO PRESERVE THE QUALITY OF YOUR WATCH
Mainspring wound condition and accuracy
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
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.
Effect of magnetism
When affected by a strong magnetism from outside, the 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.
EN 39
2
TO PRESERVE THE QUALITY OF YOUR WATCH
Troubleshooting
Troubles Possible causes Solutions
The watch stops
operating. The mainspring has not been wound.
Wind up the watch as per “How to wind the
mainspring” (P. 17), and set the time. If the
watch still does not operate, consult the
retailer from whom the watch was purchased.
The watch temporarily
gains/loses time.
The watch has been left in extremely high or
low temperatures for a long time.
Return the watch to a normal temperature so
that it works accurately as usual, and then
reset the time. The watch has been adjusted
so that it works accurately when it is worn on
your wrist under a normal temperature range
between 5°C and 35°C.
The watch has been left close to an object
with a strong magnetic field.
Correct this condition by moving and keeping
the watch away from the magnetic source,
and reset the time. If this action does not
correct the condition, contact the retailer from
whom the watch was purchased.
You drop the watch, hit it against a hard
surface, or wear it while playing active sports.
The watch is exposed to strong vibrations.
If accuracy does not return after setting the
time, consult the retailer from whom the watch
was purchased.
The watch has not been overhauled for more
than 3 years.
Consult the retailer from whom the watch was
purchased.
EN 40
2
TO PRESERVE THE QUALITY OF YOUR WATCH
11


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