Empty Bin Sensor PCA Figure 6-132 Empty Bin Sensor PCA (1 of 2) 1 Remove the Back Cover (page 298). 2 Unplug J305 (the topmost connector) from the Empty Bin Sensor PCA (callout 1). 3 Remove 2 screws and the metal plates that hold the Empty Bin Sensor PCA (callout 2). C4085-91087 7-bin Tabletop Mailbox Removal and Replacement 313