HP Pro 3420 Maintenance & Service Manual page 71

8. Disconnect the optical drive power and data cables (4) from the system board.
NOTE: Be careful not to damage the cables when disconnecting them from the board. Do not
pull on the wires.
Figure 7-32 Removing the optical drive connector
9. Remove the connector from the computer.
To install the optical drive connector, reverse the removal procedures.
Optical Drive Cables and Connector 63