Yamaha Disklavier E3 Series Maintenance Handbook page 22

B. Adjusting the Hammer Sensor Unit
By using service center mode, hammer sensor test/adjustment can be done (refer page
39, 4-2 Hmr Sensor Test).
Service Center mode  4 – 2. Hmr Sensor Test
Depress and lock the center pedal to enter the
quiet mode first
Two beeps (M1, M2) sound when hammer head
is pushed toward back. The distance between
hammer shank stopper rubber and hammer
shank will be standard measurement.
M1 (the first beep): 8.5mm (+1.5, -0mm)
M2 (the second beep): 0.5mm(+1.5, -0mm)
The hammer sensor has 4 adjustment positions as below.
Bass part
(Front view)
Treble part
Middle part
(Front view)
(Front view)
Turn clockwise for
pulling
20
18
High treble part
(Front view)
Turn clockwise for
pushing