HP 4550 Service Manual - Page 105
Basic operation, Theory of operation
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Basic operation HP LaserJet 4500 series and 4550 series printer functions are divided into three systems: the image formation system, paper pick-up feed system, and engine control system. These systems are thoroughly described in this chapter. Figure 5-1 Basic system operation To external device (host computer, etc.) through the video controller PCB Face-up tray Face-down tray Fixing unit LASER/SCANNER SYSTEM Scanning mirror Laser diode BD circuit Scanner motor Photosensitive drum Developing unit Primary IMAGE charging roller FORMATION Cleaner unit SYSTEM ITB cleaning roller Intermediate transfer belt Secondary transfer roller ENGINE CONTROL SYSTEM Connector PCB Operation panel DC controller PCB Pickup unit Multi-purpose tray Cassette Duplexing unit (option) Cassette Cassette paper pick-up unit Paper feeder (option) PICK-UP/FEED SYSTEM C7085-90921 Chapter 5 Theory of operation 103