Q1277-60008Sensor - Optointerrupter Media Sensor. HP DesignJet large-format printers and scanners. It is a component of the document feeder system designed to detect the presence and positioning of paper/media as it passes through.
Q1277-60091Sensor - Paper entry and exit media sensor
Q5669-67068Sensor - Out of paper sensor (OOPS - paper sensor.(for media sensor unit order CN727-69003).
Q6683-67004Sensor - Line sensor - Detects paper width and skew - Measures calibration accuracy and printhead alignment for Designjet T1200 T1100 T770 T770 T790 Z2100.
DesignJet T1120 HD Multifunction Printer parts list