Roland VersaCamm VS-640 Service Notes page 121

Rotate the Shaft to check that the Grit Encoder does not
30
touch the sensor
Fix the Right Side Frame Stay.
31
Fix the Right Frame and the Panel Cover.
32
When fixing the Panel
Cover, fi x the sensor with
the sensor cable and the
ribbon cable to the Panel
Board.
Perform the SERVO LOCK CHECK.
33
After turning on the Main Power SW, turn on the Sub Power
SW while pressing the left, right and down keys to enter the
Service Mode.
Panel Board
ON
3-48
Shaft
Right Side Frame Stay
Right Frame
+