HP LaserJet PRO M521 Repair Manua page 55

3.
Slide the sheet-metal bracket up to release it, and then remove the bracket.
NOTE: You might need to pull outward on the lower-right cover (callout 1) to release the sheet-
metal bracket.
Reinstallation tip
When you reinstall the bracket, make sure that the tab is engaged in the
slot in the chassis (callout 2).
Figure 1-58
Remove the I/O plate (2 of 2)
2
1
Removal and replacement procedures
ENWW 45