Roland VersaCAMM VP-540 Service Notes page 209

5 Supplemental Information
CROP MARK SENSOR
It detects the Crop Mark.
INK EMPTY SENSOR
It detects whether the Ink Cartridge is empty or not.
PINCH ROLLER SENSOR
It detects the positions of Pinch Roller.
INK CARTRIDGE IC SENSOR
It communicates with the IC chip of the Ink
Cartridge.
INK CARTRIDGE SENSOR
It detects whether the Ink Cartridge is installed
or not.
5-4