Brother International HL-1660E Service Manual - Page 17

CHAPTER II THEORY OF OPERATION This chapter describes the printer functions, the relationship between the electrical systems and mechanical systems, and the timing of operations. Striped conduits ( ) indicate mechanical linkages; solid thin arrows ( ) appearing with a signal name indicate the transmission of single control signals and outlined thick arrows ( ) indicate the transmission of groups of signals. 1. BASIC OPERATIONS 1.1 Mechanical Configuration The printer functions can be divided into four blocks: the laser/scanner system, the image formation system, the paper pick-up/feed system and the control system. Expansion memory (SIMM) Font cartridge/card Optional I/O (MIO) Main PCB Delivery rollers Fixing unit Feeder External Device Control panel CONTROL SYSTEM IMAGE FORMATION SYSTEM Cleaning unit Photosensitive drum Developing unit Laser/scanner unit Transfer separation unit LASER/SCANNER SYSTEM MP tray PAPER PICK-UP/FEED SYSTEM Tray 1 Tray 2 (Option) Figure 2.1 II - 1