ADF operation ADF document exposure control 1 The SCB sends a signal to the ADF inverter to turn on the scanning lamp. 2 The ADF intermediate PCB and ADF analog processor board pass the signal through. 3 The ADF inverter sends the signal to the scanning lamp and the document exposure process begins. Note The ADF inverter, ADF analog processor, and the ADF intermediate PCB are located inside the ADF. Figure 54. ADF document exposure control C8523-90921 ADF operation 87