Yamaha disklavier MX-100A, Product Handbook

Page: 59 / 116

II-7
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.
●
Adjustments
1. LET OFF and DROP adjustment: Same as on a conventional acoustic piano.
2. SHANK STOPPER ANGLE adjustment: Use the cable adjuster, or adjust the MD-unit stroke.
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).
[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.
(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.
DRIVE To Silent Mode MD Unit Regulating Rod
1 Silent GP Manual Drive Silent Lever — Height-Adjustable
2 DKV Silent GP Motor Drive Silent Switch On the bottom of the keybed. Height-Adjustable
3 DKV MARKIII Motor Drive Silent Switch On the keybed, at the treble side. Angle-Adjustable
Silent Off MD Unit
Silent On
LED
LED
Silent Mode
On Sensor
Silent Mode
Off Sensor
Stroke end
Adjuster
Stroke end
Adjuster
Positioning
screw
Green
Red
Green
Red
Green
Red
<Fig. 1>