Brother 1270N - Manual (Page 44)

CHAPTER 3 THEORY OF OPERATION
3-2
Fig. 3-2 shows a general block diagram of the HL-1250 printer.
Optional RAM (SIMM)
(max. 32Mbytes) Optional I/F board
(Mac. RS-232C)
Expansion
memory I/O
Expansion I/O
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 device
External 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
Fig. 3-2
HL-1250