Accuracy Of Mechanical Watches - Seiko SSA447 Instructions Manual

Problem Possible causes
The watch has been
left in extremely high
or low temperatures
for a long time.
The watch was
brought into close
contact with a
magnetic object.
The watch
gains/loses time
You dropped the watch,
temporarily.
hit it against a hard
surface or wore it while
playing active sports.
The watch was exposed
to strong vibrations.
The watch has not
been overhauled for
more than 3 years.
The date change at AM/PM is not
12 o'clock noon. properly set.
Water got inside the
The glass is blurred
watch due to the
and the blur persists
deterioration of the
for a long time.
gasket, etc.
• For the soluton of troubles other than listed above, contact the retailer from whom the watch was purchased.
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Solutions
Normal accuracy will resume when the
watch returns to normal temperature.
Normal accuracy will resume when the
watch is kept away from close contact
with the magnetic source. If this condition
persists, consult the retailer from whom the
watch was purchased.
Normal accuracy will not resume. Consult
the retailer from whom the watch was
purchased.
Consult the retailer from whom the watch
was purchased.
Advance the hands by 12 hours.
Consult the retailer from whom the watch
was purchased.

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.
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.
As the mainspring unwinds, the force
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