Roland VersaCamm VS-640 Service Notes page 148

Put the Encoder Scale in between the Encoder Plate and the
5
Guide Rail.
Then, fi x the right end with the plate and hook up the spring
on the left end.
Make sure that the Encoder Scale is in place.
Do not loosen or tighten the screws fixing the
Encoder Plate.
Move the Head Carriage in a whole width of the machine.
6
Make sure that the Encoder Scale doesn't make contact with
the Encoder Module and also Encoder Scale is between the
slit of the Encoder Module.
Carry out the [4-6 LINEAR ENCODER SETUP].
<Closeup image of Encoder Scale and Module>
Encoder Scale
Module
3-75
Encoder Scale
Guide Rail
Encoder Scale
Spring
Screw
Encoder Plate
Plate