Theory of Operation 2-11Exit Module (MEP) BoardThe exit module board controls motor and paper path functions for the exit moduleportion of the IOT. Once the print process is complete and the media is ready to exitthe IOT, the primary controller relinquishes control to the exit module (MEP) board.The exit module board is also the connection point for the stack full sensor, coveropen sensor, exit module elevator carriage, and exit sensors and flags.Scanner Power SupplyThe scanner power supply board supplies power to the scanner and exit moduleassemblies using the following voltages:■ +24 V to the scanner■ +24 V and +5 V to the exit module boardThe electronics module enables or disables the scanner power supply using the powersupply enable line for functions such as Intelligent Ready and standby functions. Thecontrol panel receives power from the power supply contained in the electronicsmodule.Electronics ModuleThe electronics module includes the main board, image processing board, the powercontrol board, hard disk drive, and the power supply. The electronics module isreplaced as one assembly.Main Board: The main board controls the operation of all the mechanical andelectrical systems in the IOT. Through the power control and I/O boards, signals arepassed to the different gear trains, heater controls, and drive motors and signals arereceived from sensors for proper operation of the IOT.The imaging process is a "three way" communication between the electronicsmodule, printhead, and wave amplifier board. Imaging data is received from eitherthe print or scan function and is processed through the imaging path portion of themain board. This data then is split into two paths. One of these paths is through thepower control board to the wave amplifier board. This data controls the operation ofthe wave amp with regard to the drive algorithm to use for driving the jet stacks(discussed later in the printhead section). The second path is through a ribbon cablefrom the main board to the printhead control board (located on the underside of theprinthead). These two signals are interpreted by the printhead to properly produce theimage on the drum.The main board provides support for Ethernet and USB 2.0 external I/O interfaces.NoteThe WorkCentre C2424 system does not support a parallel connection.
