That is SR1 original sensor
Service mode, copier>I/o adf feeder P001 to P007 ---P002 bit 1 should be 1 when flag pushed (original present) and 0 with no original.
I think to get that to lift it has to know there is a piece of paper in tray and green light on top of adf should be green. If that is not working I would guess, bad sensor, bad wiring to board or bad board. I have had people knock the flag out so it was not making the sensor.
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