HP LaserJet PRO M521 Repair Manua page 64

5.
Cut the plastic cable ties holding the wire harness to the document feeder/scanner assembly and
remove it from the channel beneath scanner rear cover.
NOTE:
scanner whole unit.
Figure 1-71
Figure 1-72
54 Chapter 1 Removal and replacement
Replace the cable ties to secure the wire harness when reinstalling the document feeder/
Remove the Document feeder whole unit kit and scanner whole unit kit (3 of 6)
Remove the Document feeder whole unit kit and scanner whole unit kit (4 of 6)
ENWW