Brother HL 1240 - B/W Laser Printer Service Manual page 40

CHAPTER 3 THEORY OF OPERATION
HL-1250
Fig. 3-2 shows a general block diagram of the HL-1250 printer.
Optional RAM (SIMM)
(max. 32Mbytes)
Control system
Expansion
RAM 4MB
memory I/O
Video control block
Engine control block
Laser unit
Drum unit
Transfer block
Charging
Drum
block
Developing
block
Toner cartridge
Image generation system
Fig. 3-2
Optional I/F board
(Mac. RS-232C)
Expansion I/O
Interface block
(Parallel / USB)
Operation block
(Operation panel)
Drive block
(DC motor)
Paper dust
cleaner block
3-2
Paper tray unit
Paper cassette
Manual feed
Fixing unit
Paper eject block
Paper feed system