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 LPT Ports Parallel Port I/O Address IRQ LPT1 378-37Fh 7 LPT2 278-27F 5 LPT3 3BC-3BFh 7 or 5 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 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 includes printer RAM Controller- Power supply- high-voltage AC and DC 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 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 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 Remember…steps of laser print 1. Cleaning California 2. Conditioning Cows 3. Writing Won’t 4. Developing Dance 5. Transferring The 6. Fusing Fandango!
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