Brother International HL-720 Service Manual - Page 103

ELECTRONICS, General Block Diagram, Fig. 2.1

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External device CHAPTERII THEORY OF OPERATION 1. ELECTRONICS 1.1 General Block Diagram Fig. 2.1 shows a general block diagram of this printer. Optional RAM (SIMM) (max. 32Mbytes) Optional I/F board (Mac. RS-232C) Control system Expansion memory I/O Expansion 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
Fig. 2.1 shows a general block diagram of this printer.
Optional RAM (SIMM)
(max. 32Mbytes)
Optional I/F board
(Mac. RS-232C)
Expansion memory I/O
Expansion I/O
Video control block
Interface block
Engine control block
Operation block
(Operation
panel)
Control system
Low-voltage power
supply block
High-voltage power
supply block
Laser scanner unit
Drive block
(Stepping motor)
Drum unit
Transfer block
Developing
block
Drum
Charging
block
Cleaner
block
External device
External device
Paper tray unit
Paper tray
Manual feed
Fixing unit
Paper eject block
Paper feed system
Image generation system
Toner cartridge
Erase lamp
Fig. 2.1