II-1
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.
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
Содержание HL-720
Страница 1: ...SERVICE MANUAL MODEL HL 720 730 730Plus R LASER PRINTER ...
Страница 36: ...II 19 1 3 10 Engine I O HL 720 Fig 2 21 shows the engine interface circuit Fig 2 21 ...
Страница 37: ...II 20 HL 730 730Plus Fig 2 22 shows the engine interface circuit Fig 2 22 ...
Страница 61: ... Fig 3 18 2 4 1 1 1 ...
Страница 92: ...SERVICE MANUAL MODEL HL 760 R LASER PRINTER ...
Страница 109: ...II 8 1 3 4 DRAM Two 4M bit DRAMs x 16bits are used as the RAM Fig 2 6 ...
Страница 113: ...II 12 1 3 10 Engine I O Fig 2 12 shows the engine interface circuit Fig 2 12 ...
Страница 114: ...II 13 1 3 11 Paper Feed Motor Drive Circuit Fig 2 13 ...
Страница 133: ...Appendix 2 Main PCB Circuit Diagram 1 3 CODE UK3227000 B48K272CIR 1 3 NAME ...
Страница 134: ...Appendix 3 Main PCB Circuit Diagram 2 3 CODE UK3227000 B48K272CIR 2 3 NAME ...
Страница 135: ...CODE UK3227000 B48K272CIR 3 3 NAME Appendix 4 Main PCB Circuit Diagram 3 3 ...