HP LaserJet PRO M521 Repair Manua page 142

4.
Remove one screw (callout 1), and then remove the right-side guide (callout 2).
CAUTION:
Figure 1-195
5. Remove one screw (callout 1), and then remove the left-side guide (callout 2).
Figure 1-196
132 Chapter 1 Removal and replacement
Use the caution. The solenoid is still attached.
Remove the HVPS (3 of 12)
Remove the HVPS (4 of 12)
2
2
1
1
ENWW