Face-up Sensors PCA Figure 6-139 Face-up Sensors PCA 1 Remove the Front Cover (page 407). 2 Remove 1 screw (callout 1). 3 Unplug J306 from the Empty Bin Sensor PCA, and remove the Empty Bin Sensor PCA (callout 2). C4265-90907 7-bin Tabletop Mailbox Removal and Replacement 431