Chapter Ii Theory Of Operation; Electronics; General Block Diagram - Brother HL-720 - B/W Laser Printer Service Manual

CHAPTER II THEORY OF OPERATION

1.

ELECTRONICS

1.1

General Block Diagram

<HL-720>
Fig. 2.1 shows a general block diagram of this printer.
Control system
Image generation system
Optional RAM board
(1.5, 3.5 Mbytes)
Expansion memory I/O
Video control block
Engine control block
Laser scanner unit
Drum unit
Transfer block
Developing
Drum
block
Charging
block
Toner cartridge
Interface block
Operation block
(Operation panel)
Drive block
(Stepping motor)
Cleaner
block
Fig. 2.1
II-1
Erase lamp
Paper tray unit
Paper tray
Manual feed
Fixing unit
Paper eject block
Paper feed system