Dell 2135cn Service Manual page 652

Chapter 3 Removal and Replacement Procedures (RRPs)
3) Insert the right shaft of the ACTUATOR
ASSY NO PAPER into the hole of the
CHUTE UP. Attach the ACTUATOR
ASSY NO PAPER.
Check the ACTUATOR ASSY NO PAPER movement, after the procedure 3 is completed.
Go to the next replacement step:
Replacement 6 SENSOR PHOTO: CST NO PAPER (PL3.2.13)
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Version 
2008.02.01