HP LaserJet 4250 Service Manual - Page 96

Cleaning the printer and accessories To maintain superior print quality and performance, thoroughly clean the printer and the paperhandling accessories at the following times: ■ Every time you change the print cartridge. ■ After printing approximately 10,000 pages. ■ Whenever print-quality problems occur. Clean the outside surfaces of the printer and accessories by using a water-dampened cloth. Clean the inside parts as indicated, see Table 4-1 Cleaning the printer. Observe the following warning and caution when cleaning the printer accessories. WARNING! Before beginning the cleaning 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 prevent permanent damage to the print cartridge, do not use ammonia-based cleaners on or around the printer. Do not touch the transfer roller (callout 1). Skin oils on the roller can cause print-quality defects. If toner gets on clothing, wipe it off with a dry cloth and wash the clothes in cold water. Hot water sets toner into fabric. Figure 4-1 Location of the transfer roller - do not touch! Table 4-1 Cleaning the printer Component Outside covers Cleaning method/notes Use a water-dampened cloth. Do not use solvents or ammonia-based cleaners. 82 4 Maintenance