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5 Functional Overview Contents Basic Printer Functions . . . . . . . . . . . DC Controller/Power System . . . . . . . . Print Engine Control System . . . . . . . Power System (on DC Controller PCA) . Formatter System . . . . . . . . . . . . . . CPU . . . . . . . . . . . . . . . . . . . . Read Only Memory (ROM) . . . . . . . Random Access Memory (RAM) . . . . Parallel Interface . . . . . . . . . . . . . Control Panel . . . . . . . . . . . . . . . Resolution Enhancement (REt) . . . . . . EconoMode . . . . . . . . . . . . . . . . Memory Enhancement technology (MEt) Enhanced I/O . . . . . . . . . . . . . . . Page Protect . . . . . . . . . . . . . . . . PJL Overview . . . . . . . . . . . . . . Image Formation System . . . . . . . . . . Toner Cartridge . . . . . . . . . . . . . . Step 1: Drum Cleaning . . . . . . . . . . Step 2: Drum Conditioning . . . . . . . . Step 3: Image Writing . . . . . . . . . . Step 4: Image Developing . . . . . . . . Step 5: Image Transferring . . . . . . . . Step 6: Image Fusing . . . . . . . . . . . Paper Feed System . . . . . . . . . . . . . . Paper Jam Detection . . . . . . . . . . . Basic Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 5-4 5-5 5-6 5-8 5-8 5-8 5-8 5-8 5-9 5-9 5-10 5-10 5-11 5-11 5-11 5-12 5-13 5-13 5-13 5-13 5-14 5-14 5-14 5-15 5-18 5-19 Functional Overview 5-1 5-2 Functional Overview Basic Printer Functions This chapter presents a generalized functional overview of the printer and the printing processes. The following printer systems are discussed: · · · · · DC Controller System/ Power System Formatter System Image Formation System Paper Feed System Laser/Scanner System Figure 5-1 is a generalized block diagram of the printer: Figure 5-1 Printer Functional Block Diagram Functional 5 Overview Functional Overview 5-3 DC Controller/Power System The DC Controller PCA coordinates all print engine activities, drives the laser, and coordinates print data from the Formatter PCA with the image formation process. The DC Controller also includes both AC and DC power supply and distribut