Laser Print Process

Front 1

1. Processing

Back 1

• Computer encodes page in printer
  
• Printer's firmware process data and stores in RAM

Front 2

2. Charging

Back 2

• Charging roller applies negative electrical charge of -600 V across drums surface
• Older printers achieve this with corona wire

Front 3

3. Writing (Exposing)

Back 3

Laser neutralizes negative charge on drum to form electrostatic negative image

Front 4

4. Developing

Back 4

Roller applies toner to drum and sticks to areas of lower charge

Front 5

5. Transferring

Back 5

• Transfer belt pshes paper to transfer roller
• Roller positively charges paper which pulls toner from the drum to the paper
  
• Static charge eliminator reduces charge and keeps paper from sticking to drum

Front 6

6. Fusing

Back 6

• Fuser assembly heats to 400°F
• Pressure roller presses the paper to the fuse which bonds the toner to the paper
  

Front 7

7. Cleaning

Back 7

• Sweep strip and cleaning blade cleans drum of residual toner
  
• Heat roller is lubricated to ensure even transfer of heat
  
• Charge on drum is neutralized