Brother International HL 1850 Service Manual - Page 77
Electronics
UPC - 012502603900
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HL-1850/1870N SERVICE MANUAL CHAPTER 3 THEORY OF OPERATION 1. ELECTRONICS 1.1 General Block Diagram HL-1850 4, HL-1870N Fig. 3-1 shows a general block diagram of the HL-1850 and the HL-1870N printers. External device Network board (Standard for HL-1670N Option for HL-1650) Optional RAM (DIMM) (max. 128Mbytes) .1 Control system RAM 8MB Expansion memory 11O Ethernet 10/100 Base TX PCI bus Video control block Interface block (Parallel / USB) External device Engine control block Operation block (Control panel) L 1- Laser unit Drive block (DC motor) Paper tray unit Paper cassette Drum unit • Transfer block • • Drum • " Paper dust cleaner block e Developing block • Toner cartridge Image generation system L MP tray Fixing unit Duplex printing unit • • Paper eject block • Paper feed system Fig. 3-1 3-1