Brother HL-1870N - Chapter 3 Theory of Operation; Electronics; General Block Diagram

HL-1850/1870N SERVICE MANUAL
3-1
CHAPTER 3 THEORY OF OPERATION
1. ELECTRONICS
1.1 General Block Diagram
Fig. 3-1 shows a general block diagram of the HL-1850 and the HL-1870N printers.
Optional RAM (DIMM)
(max. 128Mbytes)
Ethernet
10/100 Base TX
Expansion
memory I/O
PCI bus
Video control block
Engine control block
Operation block
(Control panel)
Control system
Low-voltage power
supply block
High-voltage power
supply block
Laser unit
Drive block
(DC motor)
Drum unit
Transfer block
Drum
Charging
block
External deviceExternal device
Paper tray unit
Paper cassette
MP tray
Fixing unit
Paper eject block
Paper feed system
Image generation system
Interface block
(Parallel / USB)
RAM 8MB
Paper dust
cleaner block
Developing
block
Toner cartridge
Network board
Duplex
printing unit
(Standard for HL-1670N
Option for HL-1650)
Fig. 3-1
HL-1850
HL-1870N