Epson 5700i Service Manual - Page 22

EPL-5700L/5700i Revision A 2.2 ELECTRIC CIRCUIT Since the Electric Circuit of this printer is basically the sam e as that of EPL5700, this section explains only about the M ain Control Board and its related parts. 2.2.1 Operating Principles of Controller The C292 M ain Board, which functions as a controller of the printer, consists of the M ain Controller and the Engine Controller. Main Controller TUSB USB I/F DRAM CPU SLC Parallel I/F 1284DRIVER JP1 RAMSIMM (CN1) ROM The M ain Controller processes print data sent from the host com puter and generates video signal. The Engine Controller receives video signal from the M ain Controller and drives the engine to print. FUNCTIONS OF THE MAIN CONTROLLER Com m unication with the host com puter (receiving print data and sending status). Processing the print data (analyzing com m and and generating video signal). Sending the video signal to the Engine Controller. M onitoring panel or switch conditions. FUNCTIONS OF THE ENGINE CONTROLLER Receiving the video signal and sending engine status. M onitoring sensors. Controlling the optional lower cassette. Block diagram of the C292 M ain Board and function of each device are shown on the following page. CPU Video (CN3) Engine Controller Figure 2-1. C292 Main Board OPERATING PRINCIPLES ELECTRIC CIRCUIT 22