HP 4550 Service Manual - Page 80

Cleaning the printer and accessories To maintain high print quality and performance, use the following opportunities to thoroughly clean the printer and the paper handling accessories:
every time you change the toner cartridge (run a few pages through)
after printing approximately 5,000 pages for C (cyan), M (magenta), and Y (yellow); and 8,000 pages for K (black)
whenever print quality problems occur Clean the outside surfaces with a water-dampened cloth. Observe the warning and caution below. WARNING! Before you begin these steps, turn the printer off and unplug all power cords to avoid shock hazard. Be careful when cleaning around the fusing assembly area. It might be hot. CAUTION To avoid permanent damage to the toner cartridge, do not use ammonia-based cleaners on or around the printer. Do not touch the transfer roller. Skin oils on the roller can reduce print quality. If toner gets on your clothes, wipe it off with a dry cloth and wash your clothes in cold water. Hot water sets toner into fabric. Table 4-1 Cleaning the printer Component Cleaning Method Outside covers Use an HP Toner Cleaning Cloth (part number 5090-3379) or a water-dampened cloth. Do not use solvents or ammonia-based cleaners. Inside general With a dry lint-free cloth, wipe any dust, spilled toner, and paper particles from the paper path area, the registration roller, and the toner cartridge cavity. Paper pickup, feed, Use a water-dampened, lint-free cloth. and separation rollers Separation pad Use a dry, lint-free cloth. Registration roller Use a dry, lint-free cloth. Transfer roller Use a dry, lint-free cloth. DO NOT TOUCH the transfer roller with your fingers. Fuser Use a water-dampened, lint-free cloth. Cleaning spilled toner Defective toner cartridges can develop leaks. Also, after a paper jam has occurred, some toner might remain on the rollers and guides inside the printer. The pages that print immediately after the jam can pick up this toner. CAUTION When cleaning the printer, do not touch the transfer roller with the damp cloth or with your fingers. Vacuum specifications Do not vacuum the printer or any spilled toner using a conventional vacuum. Toner particles used in this product might be too fine for effective vacuuming and could result in damage to conventional vacuums. A vacuum specifically designed for cleaning toner can be used if it is capable of filtering fine particles (5 microns in diameter). 78 Printer maintenance C7085-90921