EN Illustrations and parts lists 559 Figure 2 Table 83 PCA assemblies 7 77. PCA assemblies . PCA assembly parts Ref. Description Part number Qty. 1 PCA, cassette-size sensing RG5-1845-000CN 1 2 PCA, main relay RG5-3036-000CN 1 3 PCA, controller board RG5-3037-000CN 1 PCA, controller board for HP CLJ 8550 MFP FG2-9470-000CN 4 PCA, carousel motor (M1) RG5-3084-020CN 1 5 PCA, subrelay RG5-3085-000CN 1 6 PCA, tray 1 RG5-1884-000CN 1 7 PCA, ECO-2 assembly (HP CLJ 8550 MPF) FG6-3597-000CN Interface PCB assembly (HP CLJ 8550 MPF) FG2-9545-000CN Interface cable (HP CLJ 8550 MPF) FG2-9479-000CN IOT cable (HP CLJ 8550 MPF) FG2-9476-000CN ECO-2 cable (HP CLJ 8550 MPF) FG2-9543-000CN