HP LaserJet PRO M521 Repair Manua page 118

5.
Remove two screws and the sheet metal bracket.
Figure 1-158
6. Remove the main fan. See
7. Disconnect eight connectors and two FFCs from the DC controller.
NOTE:
Figure 1-159
108 Chapter 1 Removal and replacement
Remove the LVPS (4 of 10)
Main fan on page
To locate DC controller connector locations, see
Remove the LVPS (5 of 10)
93.
DC controller connections on page 7.
ENWW