HP LaserJet 6L Service Manual - Page 136

7 Troubleshooting Vertical Lines Sometimes vertically aligned black streaks or smears can appear on successive pages. • The toner cartridge may be damaged. Replace it. • The printer may need cleaning. See "Cleaning Your Printer," in Chapter 4. • Replace the heating element. Horizontal Stripes Sometimes horizontally aligned black streaks or smears can appear. • The toner cartridge may not be installed properly. Remove the cartridge and reinsert it. • The toner cartridge may be defective. Replace it. • If the printer still has print quality problems, the printer may require cleaning. • Replace the heating element. Repetitive Defects Sometimes light character shadows or repetitive marks appear on the page. • Refer to the "Repetitive Image Defect Ruler" later in this chapter. • The printer may need cleaning. See "Cleaning Your Printer," in Chapter 4. • The toner cartridge may be damaged, causing a repetitive black flaw on every printout. Replace the toner cartridge. • If using transparencies, use a different type of overhead transparency. • Your paper texture may be too coarse. Try changing to a paper with a smoother finish. • The photosensitive drum of the toner cartridge may have been over-exposed to bright light, causing repetitive defects (usually a blurred area). Replace the toner cartridge. Vertical White Stripes The toner cartridge may be getting low on toner. Gently shake the cartridge to redistribute the toner, or replace the cartridge. • The printer may need cleaning. (See "Cleaning Your Printer," in Chapter 4.) You may also need to clean the mirror on the laser scanner by blowing air through the scanner to remove any dust particles. Troubleshooting 7-15