To make sure there is a clear understanding here's a complete diagram
Overall Parts Diagram
To Remove the Outside Plastics on the HP Color LaserJet CP5220 Series Printer
1) Remove Right-front cover and control-panel assembly
a) Open the front door and the right door.
b) Remove two screws (callout 1).
c) Release 3 tabs (callout 1) on the right side of the assembly.
d) While holding the assembly up, pull the cable holder (callout1)
disconnect one connector (callout 2).
2) Remove Left cover
a) Remove Tray 2 from the product.
b) Open the front door.
c) Remove three screws (callout 1). Starting from the left side
tabs (callout 2),and then remove the cover from the product.
Opening the toner-collection door might make it easier to release the tabs on the left side of the cover.
If the front door will not close after the left cover has been reinstalled, verify that the two tabs on the right side of the cover have been aligned correctly with the product chassis.
3) Remove Rear cover
a) Remove six screws (callout 1), and then remove the cover
from the product.
4) Remove Toner collection unit access door
a) Open the toner collection unit access door (callout 1), remove the toner collection unit, and then release the link arm (callout 2) on the left side of the door.
b) Partially close the door, and then disconnect the right-hand link arm (callout 1) from the door.
CAUTION: Do not disconnect the right-hand link arm when the door is completely open. Doing so can disconnect the link arm spring.
c) Rotate the access door down 90 degrees, and then pull on the left side of the door to remove the access door.
5) Remove Right-rear cover
a) Remove the rear cover. See Rear cover on page 93.
b) Open the right-door assembly.
c) Remove two screws (callout 1), release one tab (callout 2),
and then remove the cover.
CAUTION: The grounding spring on the back of the cover falls off easily. Be careful not to lose it.
6) Remove Top cover
a) Remove four screws (callout 1).
b) Open the toner-collection door.
c) Release two tabs (callout 1), and then remove the cover.
7) To Reassemble Follow Instructions in Reverse