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

LPT Ports

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

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

Steps in laser printing F 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 F Conditioning –The primary corona (AKA main corona) wire uniformly charges drum to -600V

Steps cont. F 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 F Developing –Creating print image on drum –the iron particles in toner cartridge are attracted to the areas of drum exposed by laser

Steps cont. F 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 F Fusing –fusing rollers apply heat and pressure to toner –toner melts and permanently bonds to paper

Remember…steps of laser print F 1. Cleaning F 2. Conditioning F 3. Writing F 4. Developing F 5. Transferring F 6. Fusing California Cows Wont Dance The Fandango!