CHAPTER 3 THEORY OF OPERATION
3-3Fig. 3-3 shows a general block diagram of the HL-1270N printer.Optional RAM (SIMM)
(max. 32Mbytes) 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
Manual feed
Fixing unit
Paper eject block
Paper feed system
Image generation system
Interface block
(Parallel / USB)
RAM 4MB
Paper dust
cleaner block
Developing
block
Toner cartridge
Network board