Brother International HL-720 Service Manual - Page 18

Ch2 Theory of Operation, 1. Electronics

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CHAPTERII THEORY OF OPERATION 1. ELECTRONICS 1.1 General Block Diagram Fig. 2.1 shows a general block diagram of this printer. Optional RAM board (1.5, 3.5 Mbytes) Control system Expansion memory I/O Video control block Interface block External device Low-voltage power supply block High-voltage power supply block Engine control block Operation block (Operation panel) Erase lamp Laser scanner unit Drum unit Transfer block Drive block (Stepping motor) Paper tray unit Paper tray Manual feed Developing block Drum Charging block Cleaner block Toner cartridge Image generation system Fig. 2.1 Fixing unit Paper eject block Paper feed system II-1

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II-1
CHAPTERII THEORY OF OPERATION
1.
ELECTRONICS
1.1
General Block Diagram
<HL-720>
Fig. 2.1 shows a general block diagram of this printer.
Optional RAM board
(1.5, 3.5 Mbytes)
Expansion memory I/O
Control system
Video control block
Interface block
External device
Low-voltage power
supply block
High-voltage power
supply block
Engine control block
Operation block
(Operation panel)
Laser scanner unit
Transfer block
Drum unit
Developing
block
Cleaner
block
Drum
Charging
block
Toner cartridge
Image generation system
Paper tray unit
Erase lamp
Manual feed
Fixing unit
Paper eject block
Paper tray
Paper feed system
Drive block
(Stepping motor)
Fig. 2.1