Cause:
The paper stack remains up after the tray has been opened because the pressure of the spring [A] on the skew correction plate is stuck between the side fence, so the stack [B] remains up even after the plate is lowered from under it.
This problem occurs only when the operator opens the tray. This does not occur during paper feed because the bottom plate does not operate.
Solution:
Caution the operator that when opening the tray, check the top of the stack. If paper remains up, remove the stack and load it in the tray again.