Yamaha Silent Piano M112SG Maintenance Handbook - Page 7
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4.Check / Adjustment of Silent mechanism
1)Checking and Adjustment Shank Stop Position
[Checking]
Shank stop position : 4.5 to 7mm at each section in the following conditions
・Center pedal is depressed and locked to the left
・Hammers are moved towards the strings till they touch the shank stopper
・Check distance between the tip of the hammers and the strings
4.5 to 7.0mm
[Adjustment]
・In case the overall position is too wide or too narrow
→Adjust by rotating the turn buckle
・In case the position differs between sections
→Adjust position of the rails of each section on the shank stopper assembly
2)Checking pedal stroke
[Checking]
Check if the hammer shanks do not touch the shank stopper, when the silent mode is
released.
[Adjustment]
Normally, they will not touch if the shank stop position is
Adjusted correctly.
・Confirm that the shank stop position is not too wide
・Check the stroke of the center pedal.
Make sure that the mute pedal ON/OFF stroke (shown on
the right) is approximately 8mm.
Since pedal stroke is determined by the size of the mute
pedal slot on the bottom sill, attach a slide skin to adjust.
Hammer shank stopper
Fig.9
Fig.10
Adjustment screws
7
Fig.11
Glue additional skin if needed