Brother 1240 Service Manual page 45

HL-1270N
Fig. 3-3 shows a general block diagram of the HL-1270N printer.
Control system
RAM 4MB
Drum unit
Charging
Image generation system
Optional RAM (SIMM)
(max. 32Mbytes)
Expansion
memory I/O
Video control block
Engine control block
Laser unit
Transfer block
Drum
block
Developing
block
Toner cartridge
Fig. 3-3
3-3
CHAPTER 3 THEORY OF OPERATION
Network board
Ethernet
10/100 Base TX
PCI bus
Interface block
(Parallel / USB)
Operation block
(Control panel)
Drive block
(DC motor)
Paper dust
cleaner block
Paper feed system
Paper tray unit
Paper cassette
Manual feed
Fixing unit
Paper eject block