If the connector board is still connected to the CD-ROM unit:

Remove the connector board using two fingers on either side of the board and prying it up.

When assembling, place the connector board on the logic board inside the housing. Push it down until the connector pins are visible at the surface of the connector board.

When assembling, make sure the two logic boards (one in the housing and one on the CD-ROM unit) are pushed into the connector board all the way.