Dell 2135cn Service Manual page 731

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 ADs.
3) Push the BLOCK STOPPER PHD AD to
the printer until it is locked.
Go to the next replacement step:
Replacement 48 LED ASSY ERASE (PL4.1.8)
3 - 229
Version 3 2008.06.13