DC controller operations The DC controller controls the operational sequences of the product systems. Figure 1-8 DC controller block diagram Engine controller AC input Low-voltage power supply Motor Fuser unit Solenoid Transfer roller Photointerrupter DC controller High-voltage power supply Cartridge Switch Laser scanner Formatter Operation panel Solenoid Fan Duplex connector PCA Duplex model only Table 1-7 DC controller controlled components ENWW Engine-control system 13 Component Designator Description Motor M1 Main motor M2 Scanner motor