Dell EMC DSS 9620 Installation And Service Manual page 224

3 Release the hooks locked on the OCP card.
4 Grasp the back of the OCP card and tilt upward. Do not lift the back of the OCP card completely to prevent damage to the
components and I/O ports on the front.
5 Pull the OCP card back to release the I/O ports from the chassis, and lift the OCP card out to remove.
224 Installing and removing server components