Roland VersaCAMM VP-540 Service Notes page 129

Put the Encoder Scale in between the Encoder Plate and
5
the Guide Rail.
Then, fix 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].
SPRING
3-66
ENCODER SCALE
SCREW
PLATE