Remove the four Phillips PH1 screws (circled in red) holding the PCB onto the back of the drive.

Disconnect the three ribbon cables still attached to the PCB (boxed in green in the first picture) by pulling the tabs (circled in red in the second picture) on the side of each ribbon cable "holder" away from the "holder" (See arrows - there are two tabs per ribbon cable "holder.").

Pull off the PCB from the back of the hard drive and remove the protective foam sheet from the back of the board.