Yamaha Disklavier MX-100A Service Manual page 31

[TEST 3]
Applies pressure onto 5 consecutive keys. Tests the sound generation while playing trills (check for
noise, etc.)
If sound generation is faulty:
If noise is generated: See [TEST 2]
[TEST 4]
Turns ON the Damper Pedal/Soft Pedal five times for one second each time. Tests the efficacy of the
Damper Pedal and Soft Pedal.
If a pedal malfunctions:
28