CHAPTER 3 THEORY OF OPERATION
3-1
CHAPTER 3 THEORY OF OPERATION
1. ELECTRONICS
1.1
General Block Diagram
Fig. 3-1 shows a general block diagram of the HL-1230/1440 printer.
HL-1230/1440
Fig. 3- 1
Video control block
Interface block
(HL-1230: Parallel)
(HL1440: Parallel/USB)
Engine control block
Optional RAM (SIMM)
(max. 32Mbytes)
(HL-1440 only)
Operation block
(Control panel)
Control system
Low-voltage power
supply block
High-voltage power
supply block
Laser unit
Drive block
(DC motor)
Drum unit
Transfer block
Drum
Charging
block
External device
Paper tray unit
Paper cassette
Manual feed
Fixing unit
Paper eject block
Paper feed system
Image generation system
RAM 2MB
Expansion memory I/O
(HL-1440 only)
Paper dust
cleaner block
Developing
block
Toner cartridge
Fig. 3-1
Summary of Contents for HL-1470N
Page 7: ...6 1 106 065 X 1WVGT JWVG 2 0 ...
Page 59: ...CHAPTER 3 THEORY OF OPERATION 3 9 Fig 3 8 ...
Page 61: ...CHAPTER 3 THEORY OF OPERATION 3 11 Two 32 Mbits ROMs x 16 bit are fitted Fig 3 11 HL 1470N ...
Page 197: ... 26 4 6417 5 116 0 ...
Page 223: ...Appendix 15 Engine PCB Circuit Diagram CODE LJ88009001 B512136 CIR A XX NAME ...
Page 224: ...Appendix 16 Network Board Circuit Diagram HL 1470N CODE LJ8107000 B512058CIR A 29 NAME ...
Page 227: ...CODE NAME Appendix 19 High voltage Power Supply PCB Circuit Diagram ZLe MPH3212 ...
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Page 248: ...12 ACCESSORIES MODEL HL 1230 1440 1450 14700N 84U Z31 Z32 Z33 Z34 920 18 2 3 4 1 ...