HP OEM HP 500/800/4200 Drive Roller Encoder Sensor;Compatibility:HP Designjet 500,HP Deskjet 500,HP Deskjet 500c,HP DeskWriter 500c,HP LaserJet 4200,HP Officejet 500,HP PSC 500;HP 500/800/4200 Drive Roller Encoder Sensor;HP, C7769-60384, C7769-60172, HP 500/800/4200 Drive Roller Encoder Sensor, Printer Part;Brand: HP