Roland SOLJET Pro III XC-540 Service Notes page 208

WIPER SENSOR
It detects the limit position of the Wiper
movement.
HEAD UP/DOWN SENSOR
It detects the position of the Head
Height Lever.
THERMISTOR (HEAD)
It takes the temperature around the Head.
The black Head is used for the measurement.
CAPPING SENSOR
It detects the limit position of the Capping Unit.
5-3
5 Supplemental Information
ENCODER MODULE
It detects coordinates for carriage
moving direction.