HP 3150 EN - Manual (Page 141)

EN Internal assemblies 139
6 Turn the feed assembly over and place it in one hand with the
roller-side down. Pop one of the tabs on the other side and the
feed roller should fall into your hand.
Figure 67. Feed assembly removal (3 of 3)
To reinstall
Before securing the screw, ensure the tabs on the feed assembly are
positioned in their slots on the paper feed frame. Failure to do so will
cause paper feed problems.