HP LaserJet 3052 Service Manual - Page 90
Formatter system, Central processing unit
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Formatter system The formatter coordinates the major systems. It is responsible for the following tasks or actions: ● Formatting and controlling copies ● Receiving and processing print data from the all-in-one interface ● Monitoring the control panel and relaying all-in-one-status information ● Developing and coordinating data placement and timing with the print engine ● Communicating with the host computer through the bidirectional interface ● Communicating fax data to and from the LIU (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) The formatter receives print data from the bidirectional ECP mode interface or USB interface and converts it into a dot image. The ECU synchronizes the image-formation system with the paper-feed system and signals the formatter to send the print-image data. The formatter sends the print-image data (dots) in the form of a video signal, and the printing process begins. Central processing unit The formatter incorporates an embedded Coldfire V4 processor operating at 133 MHz. Line interface unit (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) The line interface unit (LIU) provides the required safety isolation, signal coupling, and impedance matching between the telephone line and the modem chipset that is located on the formatter. 70 Chapter 4 Theory of operation ENWW