Bedienungsanleitung Seiko 9S66 (Seite 21 von 25) (Englisch)

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Cautions for accuracy of mechanical watch

Mechanical watches have a mechanism that is moved by power generated when the

mainspring is unwound, and small metal parts physically work together to control the

accuracy. Fragile metal parts of a mechanical watch are easily influenced by external

environment such as temperature, gravity, and shock. Also, conditions of use such as normal

usage time and winding state of the mainspring can influence the loss/gain of the watch.

1Accuracy of mechanical watch is “mean daily rate.”

Accuracy of the quartz watch is indicated monthly or annually such as a monthly rate of

±15 seconds or annual rate of ±10 seconds. This indicates the degree of total difference

in accuracy when the quartz watch is continuously used for a month or a year.

To the contrary, accuracy of the mechanical watch is normally indicated as a “mean daily

rate.”

Accuracy of the mechanical watch slightly varies each day as it is influenced by various

conditions of use, and it is normally unstable. Then it is required to judge whether the

accuracy is satisfactory or not by checking the mean values in the case of use for a week

to ten days, but not for only one day.

For normal usage accuracy of Grand Seiko mechanical watch, -1 to +10 seconds (–1 to

+8 seconds for Cal. 9S86 and 9S85, –5 to +10 seconds for Cal. 9S27) per day are specified

as target values. If the mean value exceeds the abovementioned target value in the normal

usage condition when the watch is used for a week to ten days, we will adjust it.

* Adjustment is provided free of charge for three years after purchase, then charged

thereafter. However, please note that the parts that are age-deteriorated due to long

duration of use may not be adjusted to your desired accuracy. For details, refer to pages

P. 35 and P. 39.

2Factor influencing accuracy -1: Wound amount of the mainspring

In order to use the mechanical watch at better accuracies, it is required to supply a constant

strong energy wherever possible to respective parts.

In the state where the mainspring is fully wound, accuracy is stable, however, when the

mainspring is unwound to weaken energy to be supplied, the parts controlling accuracy

tends to be externally influenced, and accuracy becomes unstable.

In order to use a mechanical watch at a steady accuracy, it is recommended to use it in a

condition where the mainspring is sufficiently wound.

3Factor influencing accuracy -2: Temperature influence

Mechanical watch parts are metal which slightly elongate and contract by change in

temperature, and this influences accuracy. Normally, under high temperatures, it tends to

lose time, and under low temperatures, it tends to gain time.

4Factor influencing accuracy -3: Difference by position (orientation of a watch)

Parts related to accuracy of a mechanical watch are also influenced by the earth’s gravity.

For example, gain or loss differs when a watch is horizontally placed and when it is vertically

placed in the 12 o’clock up position.

When the watch is not worn on the wrist, accuracy errors that occur while wearing can also

be compensated to some extent according to the position. Try to place it in various positions

to find the position appropriate to your watch.

38 THE GRAND SEIKO STANDARD

■

TO PRESERVE THE QUALITY OF YOUR

WATCH

After-sale service

Notes on guarantee and repair

○ Contact the retailer from whom the watch was purchased or Grand Seiko international

service network mentioned on CERTIFICATE OF GUARANTEE or our website for repair

or overhaul.

○ Within the guarantee period, present the certificate of guarantee to receive repair services.

○ Guarantee coverage is provided in the certificate of guarantee. Read carefully and retain

it.

○ For repair services after the guarantee period has expired, if the functions of the watch can

be restored by repair work, we will undertake repair services upon request and payment.

Replacement parts

○ Please keep in mind that if original parts are not available, they may be replaced with

substitutes whose outward appearance may differ from the originals.

Inspection and adjustment by disassembly and

cleaning (overhaul)

○ Periodic inspection and adjustment by disassembly and cleaning (overhaul) is

recommended approximately once every 3 to 4 years in order to maintain optimal

performance of the watch for a long time.

○ The movement of this watch has a structure that consistent pressure is applied on its power-

transmitting wheels. To ensure these parts work together properly, periodic inspection

including cleaning of parts and movement, oiling, adjustment of accuracy, functional check

and replacement of worn parts is needed. Inspection and adjustment by disassembly and

cleaning (overhaul) within 3 to 4 years from the date of purchase is highly recommended

for longtime use of your watch. According to use conditions, the oil retaining condition of

your watch mechanical parts may deteriorate, abrasion of the parts may occur due to

contamination of oil, which may ultimately lead the watch to stop.

As the parts such as the gasket may deteriorate, water-resistant performance may be

impaired due to intrusion of perspiration and moisture.

Please contact the retailer from whom the watch was purchased for inspection and

adjustment by disassembly and cleaning (overhaul). For replacement of parts, please

specify “GRAND SEIKO GENUINE PARTS”. When asking for inspection and adjustment

by disassembly and cleaning (overhaul), make sure that the gasket and push pin are also

replaced with new ones.

○ When your watch is inspected and adjusted by disassembly and cleaning (overhauled),

the movement of your watch may be replaced.

TO PRESERVE THE QUALITY OF YOUR WATCH

English

Seiko 9S66 Seite 21

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