Printer cables

1
Printer cables

• Maximum length for parallel cable is 15 feet.
  (some say 10)
  
• 25-pin DB male connector on cable connects to DB
  female connector on motherboard
  
• 36-pin Centronics connector on printer end of
  connecting cable
  

2
LPT Ports
3
Parts of a laser printer

• Photosensitive drum- reacts to light
• holds a charge except where it is exposed to
  light
  
• Paper transport- 4 types of rollers that move
  paper through printer
  
• This is where most paper jams occur!
• Primary corona- main corona
• located inside toner cartridge
• uniformly charges drum to -600V

4
Parts cont.

• Transfer corona- transfers image from drum to
  paper
  
• transfer corona charges the paper
• the charged paper pulls toner from drum to paper
• Fusing roller- permanently melts toner to page
• this is why laser printer pages are hot
• Controller- includes printer RAM
• Power supply- high-voltage AC and DC

5
Steps in laser printing

• Cleaning
• Before page is printed, remnants of previous
  print are swept away
  
• Rubber blade sweeps left-over toner away
• Fluorescent lamp removes any remaining electrical
  charge on drum
  
• Conditioning
• The primary corona (AKA main corona) wire
  uniformly charges drum to -600V

6
Steps cont.

• Writing
• image of page is created on drum
• where laser beam contacts drum, the charge is
  reduced to -100V from -600V
  
• the controller loads sheet of paper to the
  registration roller of the paper transport
  system
  
• Developing
• Creating print image on drum
• the iron particles in toner cartridge are
  attracted to the areas of drum exposed by laser

7
Steps cont.

• Transferring
• image transferred to paper
• sheet of paper at registration roller is given a
  positive charge
  
• negatively charged toner on drum is attracted
  onto positively charged paper
  
• Fusing
• fusing rollers apply heat and pressure to toner
• toner melts and permanently bonds to paper

8
Remembersteps of laser print

• 1. Cleaning
• 2. Conditioning
• 3. Writing
• 4. Developing
• 5. Transferring
• 6. Fusing

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• Dance
• The
• Fandango!