HP LaserJet 2300 won't detect paper in tray.

[koolzero]

Tray 2 is full of paper however the display says to load paper in tray 2. Any suggestions on fixing something like this?

[MichaelTech]

Pull out tray, and look at the P\U roller, to the right of it is the sensor flag.
Test it's motion, and re-set it if need be. Otherwise, the sensor may be bad, order PN# RB2-6304. Remove the P\U assy, and it will be under it on the frame. The cable, J2002 connects to the ECU.