Printing from the Optional 500-sheet Universal Tray The operation sequences of the Paper Feeder are controlled by the Paper Feeder Driver. A 4-bit microprocessor is used in the Paper Feeder Driver, which controls the sequences of the Paper Feeder and the serial communication with the Engine Controller Board. The Engine Controller Board outputs the pickup command to the Paper Feeder Driver with the necessary timing. The Paper Feeder Driver drives the solenoid in response to the pickup command. The Paper Feeder Driver also returns the status of the Paper Feeder to the Engine Controller Board.
+24VDC is supplied to the Paper Feeder from the printer, and +3.3V for the integrated circuits is generated from +24VDC inside the Paper Feeder Driver. Figure 5-26 Paper Feeder Driver I/O Paper Feed System 5-41