Yamaha Disklavier MX-100A Service Manual page 52

3. Block Diagram
3-1. Key Scanner
Scanning is beginning from the C # note of Octave 0 to detect the status of the hammers within the octave
for witch Pin K is "1" (the octave in which a key is being pressed).
Key scanning is then stopped for 16µSec. while that hammer status is sent to the key Assignor. During
the next 16µSec. interval, the next higher octave is scanned if the Pin K has not become "1" during that
interval, scanning shifts to the next note (D). Consequently, if "N" is the number of keys being pressed,
the scanning time for all keys (T) conforms to the equation below:
T=16x(12 + N)µSec.
49