HP LaserJet Enterprise M552 - Trays 3-5 tray lift operation

Trays 3-5 tray lift operation
The 550-sheet paper feeder keeps the paper stack surface at the correct pickup position. The tray lift
operation occurs under the following conditions:
●
The printer is turned on.
●
The tray is inserted.
●
The paper stack surface of the tray lowers.
The sequence occurs as follows:
1. The feeder tray-lifting motor rotates and the lifter moves up.
2. When the paper-feeder media-stack-surface sensor detects the stack surface of the paper, the lifting
motor stops.
3. The lifting motor rotates again to lift the lifter when the paper-feeder media-stack-surface sensor
detects the stack surface, and then lowers during printing.
If a tray media-stack-surface sensor does not detect a stack surface within a specied period after the lifting
motor starts rotating, the paper feeder driver determines that the lifting motor has failed and noties the
formatter through the DC controller.
The paper-feeder driver noties the formatter if either of the paper-feeder media-stack-surface sensors fails
to detect the stack surface within a specied period from when a lift-up operation starts.
68 Chapter 1 Theory of operation ENWW