Roland SOLJET Pro III XC-540 Service Notes page 127

Fix the Flexible Cable with the Clamp.
19
Fix the Tool Carriage Board, and connect the Crop Mark
20
Sensor, Pinch Roller Sensor and Solenoid Wirings.
Put the Encoder Scale in between the Encoder Plate and
21
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.
22
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.
Clamp
Pinch Roller Sensor
Crop Mark Sensor
Solenoid
Spring
3-65
Tool Carriage
Board
Encoder Scale
Encoder Plate Screw Plate