1. Printer Review

2. Six Steps of Laser Printing 1. Cleaning 2. Conditioning 3. Writing 4. Developing 5. Transferring 6. Fusing Take place inside toner cartridge Take place inside toner cartridge Use components that undergo the most wear Use components that undergo the most wear

3. Side View

4. Step 1: Cleaning

5. Step 1 Mind-Numbing Detail Sweeper strip cleans the drum Sweeper strip cleans the drum Remove/swept away by Sweeping blade Remove/swept away by Sweeping blade Cleaning Blade finishes physical cleaning Cleaning Blade finishes physical cleaning Erase lamps remove electrical charge Erase lamps remove electrical charge

6. Step 2: Conditioning Primary Charging Roller conditions drum to contain a Uniform high electrical charge (-600 V) Primary Charging Roller conditions drum to contain a Uniform high electrical charge (-600 V)

7. Step 3: Writing Laser beam discharges a lower charge to only those places where toner is to go Laser beam discharges a lower charge to only those places where toner is to go

8. Writing Mind-numbing Detail Uniform charge is discharged only where the laser beam hits (due to photosensitivity) Uniform charge is discharged only where the laser beam hits (due to photosensitivity) Mirrors reflect the laser beam onto the Drum Mirrors reflect the laser beam onto the Drum Scanning Mirror directs beam across the page Scanning Mirror directs beam across the page Main mirror(as wide as the page) reflects beam onto drum through a slit Main mirror(as wide as the page) reflects beam onto drum through a slit Focusing lens sharpens the image Focusing lens sharpens the image Beam detect causes DC controller to step the drum and start a new scan Beam detect causes DC controller to step the drum and start a new scan

9. Step 4: Developing Toner is placed onto the drum where the charge has been reduced Toner is placed onto the drum where the charge has been reduced

10. Developing Mind-numbing Detail Charged (~-300V) Toner (resin coated iron) is attracted to the developing cylinder magnetically Charged (~-300V) Toner (resin coated iron) is attracted to the developing cylinder magnetically Control blade creates even distribution Control blade creates even distribution Charged Toner is pulled off developing cylinder onto drum Charged Toner is pulled off developing cylinder onto drum Toner is charged by DC bias on Dev.Cyl. The amount of bias controls density Toner is charged by DC bias on Dev.Cyl. The amount of bias controls density

11. Step 5: Transferring Strong electrical charge draws toner off drum onto paper; takes place outside the cartridge Strong electrical charge draws toner off drum onto paper; takes place outside the cartridge

12. Transfering As paper is feed to roller a transfer charging roller creates a positive charge As paper is feed to roller a transfer charging roller creates a positive charge As paper passes by drum, the toner is drawn to the positively charged paper As paper passes by drum, the toner is drawn to the positively charged paper After paper passes roller the static charge eliminator reduces the charge on the paper and the drum After paper passes roller the static charge eliminator reduces the charge on the paper and the drum

13. Step 6: Fusing Heat and pressure fuse toner to paper Heat and pressure fuse toner to paper

14. Fusing Mind-numbing detail Fusing roller apply heat and pressure. Fusing roller apply heat and pressure. Toner melts into paper Toner melts into paper If temperature exceeds 410 degrees F the fusing system shuts down If temperature exceeds 410 degrees F the fusing system shuts down