PCB assemblies ADF analog processor PCB 1 Remove the ADF optical unit. See page 125. 2 Disconnect one ribbon cable (callout 1). 3 Remove four mount screws (callout 2). 4 Lift the ADF analog processor PCB to remove it. 2 2 1 1 Figure 142. ADF analog processor PCB To reinstall Make sure that the mount pins are aligned correctly before securing the PCB with the mount screws. C8523-90921 PCB assemblies 155