Yamaha disklavier MX-100A, Product Handbook

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DGPS, DKVPRO, MARKIII (1-beam 4-points)
For all except the PRO, use “HAMMER SENSOR HEIGHT TEST” on the SENSOR SHEET menu.
For the PRO, use “HAMMER SENSOR HEIGHT TEST” on the “Sensor unit test” menu.
(2) HMR TEST
KEY NUMBER = XX ON
Slowly advance the hammer toward the stopper, and
check points H1 to H4 (buzzer ON and OFF).
Confirm that H4 occurs when the hammer is 1.5 mm
away from the strings. For silent mode, confirm that the
hammer advances through H3 (so that the second buzzer
comes on.)
REST
H1 1st buzzer ON
H2 1st buzzer OFF
H3 2nd buzzer ON
H4 2nd buzzer OFF