Dell 2135cn Service Manual page 695

Chapter 3 Removal and Replacement Procedures (RRPs)
Note: Described below is the replacement procedure common among the upper and lower of
the BLOCK STOPPER PHD D.
3) Push the BLOCK STOPPER PHD D to
the printer until it is locked.
Go to the next replacement step:
Replacement 27 KIT DRIVE ASSY MAIN (PL7.1.98)
3 - 193
Version 
2008.02.01