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楽器 Yamaha BB614のPDF オーナーズマニュアルをオンラインで閲覧またはダウンロードできます。Yamaha BB614 11 ページ。 User guide
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The tuning machines have spring-loaded mechanisms which

automatically take up wear, preventing backlash. However, it is

possible to adjust the amount of pressure required to turn the

machines. Each machine has a tension adjustment screw, as

illustrated.

Loosen

Tighten

TUNING MACHINE TENSION ADJUSTMENT

Clockwise rotation tightens the machine. The tuning machines

should be adjusted to the extent that they are firm, but can turn

smoothly. This adjustment is normally unnecessary, and exces-

sive tightening can lead to premature tuning machine wear.

Tighten

Loosen

Tighten