Gp Silent Models: Adjusting The Shank Stopper And Regulating Rods - Yamaha Disklavier MX100A Product Handbook

2. GP Silent Models: Adjusting the Shank Stopper and Regulating Rods

GP silent models include a quick escapement mechanism that automatically accelerates the jack escape when the
piano is placed into silent mode. For this reason the let-off can generally be adjusted in the same way as on a con-
ventional acoustic grand piano.
The shank stop mechanism utilized in GP silent models consists of the following parts.
1. Shank Stopper
2. Regulating Rod
3. Jack with two knobs
4. Silent lever or Motor Drive (MD) Unit
The drive mechanism may be any of three types, as follows.
1 Silent GP Manual Drive
2 DKV Silent GP Motor Drive
3 DKV MARKIII Motor Drive
Adjustments
1. LET OFF and DROP adjustment:
2. SHANK STOPPER ANGLE adjustment: Use the cable adjuster, or adjust the MD-unit stroke.
[MD-Unit Adjustments]
MD-unit adjustment is generally not required. Carry out this adjustment only if the shank-stopper
adjuster (cable adjustment) does not produce acceptable results.
LED
Silent Mode
On Sensor
Positioning
Stroke end
Adjuster
DRIVE To Silent Mode
Silent Lever
Silent Switch
Silent Switch
Adjust the cable adjuster (mounted on the drive cable) so that the hammer shanks hit
the shank stopper perpendicularly during silent-mode operation. If the necessary
adjustment cannot be made with the cable adjuster, adjust the MD unit (see Fig. 1).
Note that the MarkIII does not require this adjustment (it does not include a cable
adjuster and does not require adjustment of the MD unit).
Silent Off
Silent Mode
Off Sensor
Stroke end
screw
Adjuster
Silent On
MD Unit
On the bottom of the keybed.
On the keybed, at the treble side.
Same as on a conventional acoustic piano.
MD Unit
LED
Green
Red
Green
Red
Green
Red
<Fig. 1>
II-7
Regulating Rod
— Height-Adjustable
Height-Adjustable
Angle-Adjustable
(1) Remove the screws holding the
cover of the MD-unit (under the
rear part of the keybed) in place.
Then remove the cover. (Refer to
the Unit Locations diagram on
page 2.)
(2) Loosen the positioning screw for
the silent-mode-ON sensor.
(3) Turn the stroke-end adjuster as
necessary to adjust the shank stop-
per angle.
(4) Adjust the position of the silent-
mode-ON sensor such that the
silent-mode-ON LED comes on
(red only) at the moment that the
drive arm touches the stroke-end
adjuster.
(5) Check the operation of the shank
stopper.