Dell 2135cn Service Manual page 747

Chapter 3 Removal and Replacement Procedures (RRPs)
Note: Check that the PHD Unit is secured.
4) Rotate the four Stoppers of the PHD
Unit to clockwise.
5) Remove the paper from the TRANSFER
ASSY.
6) Close the COVER ASSY FRONT.
3 - 245
Version 
2008.02.01