Silent Let-Off Adjustment - Yamaha GB1KS Maintenance Handbook

5. Silent let-off (=Hammer let-off in the Silent mode)
-Adjust the level of the regulating rod to the position so that jack [A] and [a] as a structure
respectively contact [B] and [b] almost simultaneously when the Silent mechanism is engaged
(Fig.14).
-The result of this adjustment will set the Silent let-off distance from the shank stopper +1 to 2mm
(Fig.15 : 6 to 8mm from the string).

◆Silent let-off adjustment

Silent let-off
Adjustment spot
Adjustment hint
Adjustment
method
-Adjust Silent mode let-off
To narrow Silent mode let-off : Rotate screw clockwise
To increase Silent mode let-off : Rotate screw counterclockwise
Fig.14
Escapes at the shank stopping position +1 to 2mm
(6 to 8mm from the string)
(At this time, jack [A] and [a] contact [B] and [b] almost
simultaneously.)
Regulating rod adjustment screw (Fig.16)
For 1 screw rotation, Silent let-off changes 3mm.
⇒P.10, 11
In Silent mode let-off, jack escapement (drop) cannot be seen. To
confirm Silent let-off, increase drop to 8 to 9mm.
Shank stopping position : 6 to 8mm from the string
- 9 -
Silent let-off : shank stopping position +1 to 2mm
Fig.15
Fig.16