Yamaha YK-X Series User Manual page 105

12) Go out of the safeguard enclosure, and check that no one is inside the safe-
guard enclosure. Then turn on the controller.
13) Perform the absolute reset from outside the safeguard enclosure.
14) After the absolute reset is completed, read the machine reference value dis-
played on the MPB.
15) If the machine reference value is in the range between 40 and 60 (recom-
mended range), then the machine reference has been completely adjusted.
If it is outside the recommended range, then repeat the procedure that starts
in 5) to readjust it.
16) Reattach the cover after the adjustment is complete.
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CHAPTER 4 Adjustment