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File name Laserjet1100service manual3.pdf

3 Functional Overview Chapter contents Basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Printer functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Control Unit (ECU)/power system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Formatter system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Image formation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Printer paper feed system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Document scanner system (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic sequence of operation (formatter to printer) . . . . . . . . . . . . . . . . . . . . . . . 42 43 44 48 51 53 56 58 C4224-90962 Chapter contents 41 Basic functions This chapter presents a functional overview of the HP LaserJet 1100 Printer's processes. The following systems are discussed: · · · · · · engine controller unit (ECU) system/power system formatter system image formation system paper feed system (printer) and document feed system (optional document scanner) document scanner system (optional) optical system (located in the optional document scanner) The HP LaserJet 1100 Printer consists of the printer and the document scanner (HP LaserJet 1100A Printer-Copier-Scanner). Operation sequences of the printer are controlled by the ECU. Operation sequences of the document scanner are controlled by the video controller. Figure 3-1 Basic configuration 42 Functional Overview C4224-90962 Printer functions Printer functions are divided into six groups: 1 2 3 4 5 6 ECU/power system formatter system image formation system printer paper feed system document scanner system basic sequence of operation (formatter to printer) The following figure is a block diagram of the printer unit: To external device (host computer, etc.) via video controller LASER/SCANNER SYSTEM Face-down delivery tray Scanning mirror Laser diode Scanner motor BD circuit ENGINE CONTROL SYSTEM Engine controller PCB Face-up delivery slot Primary charging roller Cleaner unit Fixing Photosensitive drum Transfer charging roller Developing unit Pick-up control PICK-UP/FEED SYSTEM Figure 3-2 Printer unit functional block diagram C4224-90962 Printer functions 43 Manual feed slot IMAGE FORMATION SYSTEM Multi-purpose tray Engine Control Unit (ECU)/power system The Engine Control Unit (ECU) coordinates all print engine activities, drives the laser, and coordinates print data from the formatter with the image formation process. The ECU also includes power supply and distribution circuitry. The ECU controls the following systems and functions: · Printer engine control · printer laser/scanner drive · paper motion monitoring and control · motor · Power system · AC power distributi