HP LaserJet PRO M521 Repair Manua page 73

4.
Release one tab and remove the scanner lower cover. Feed the USB and Wi-Fi module cables,
and the control-panel FFC, through the openings in the lower cover as you are removing the lower
cover.
Figure 1-87
5.
Press forward on the control-panel sub-cover, and then remove the sub-cover.
Figure 1-88
ENWW
Remove the control-panel FFC (3 of 6)
Remove the control-panel FFC (4 of 6)
Removal and replacement procedures
63