Fig. 3-2- Page 44

CHAPTER 3  THEORY OF OPERATION

3-2

Fig. 3-2 shows a general block diagram of the HL-1250 printer.

Optional RAM (SIMM)
     (max. 32Mbytes)

Optional I/F board 
  (Mac. RS-232C)

Expansion 

memory I/O

Expansion I/O

Video control block

Engine control block

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

External device

Paper tray unit

Paper cassette 

Manual feed

Fixing unit

Paper eject block

Paper feed system

Image generation system

Interface block

(Parallel / USB)

RAM 4MB

Paper dust

cleaner block

Developing

 block

Toner cartridge

Fig. 3-2

HL-1250