Yamaha Silent SB Series Service Manual page 20

SILENT SB SERIES
[2] Sensor Test Mode
1) Start up
Switch on the power source while pressing the lowest A(1), B(3), and C(4) keys.
2) Key sensor unit
Confirm that the sounding position is the same as in the upright piano silent series.
K1 Buzzer sound 1 Sound position is 2.7mm from keyboard.
K2 Buzzer sound 2 Sound position is 4.5mm from keyboard.
K3 Buzzer sound 3 Sound position is 6.3mm from keyboard.
K4 Buzzer sound 4 Sound position is 8.1mm from keyboard.
3) Pedal sensor unit
Damper pedal: Confirm the three levels of buzzer sounds.
Soft pedal: Confirm the one level of buzzer sound.
[3] Key Range Test Mode
1) Start up
Switch on the power source while pressing the lowest A(1), B(3), C(4), and D(6) keys.
2) Confirmation
This confirmation mode is to make sure that the key shutter strokes are within the adjustment range.
Select one key.
That key will sound if its AD value is either 0% or over 98% of the maximum value.
As a guide to finding that the key is positioned correctly, lift up the key and set the open value to the maximum.
The key position is correct if the key does not sound at either the rest or the end value.
Note: If the sound keeps sounding during adjustment, restart by pressing the damper pedal.
[4] Total Confirmation
After all is confirmed, check the sound of each key and confirm its sound volume is consistent.
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