DC controller operations The DC controller controls the operational sequences of the product systems. Figure 1-7 DC controller block diagram Table 1-6 DC controller controlled components ENWW Engine-control system 11 Engine controller AC input Low-voltage power supply Fuser unit Transfer roller DC controller High-voltage Cartridge power supply Formatter Operation panel Motor Solenoid Photointerrupter Switch Laser scanner Component Designator Description Motor M1 Main motor M2 Scanner motor Solenoid SL1 Pickup solenoid Photointerrupter PS701 Fuser delivery sensor PS702 Media width sensor PS751 Top-of-Page (TOP) sensor PS901 Main-motor rotation-number sensor