Lexmark C520 Service Manual - Page 74

5022-xxx Print quality-random marks Service tip: The primary cause of random marks is due to loose material moving around inside the printer and attaching to the photoconductor unit, developer roll, or transfer belt. Step Questions / actions 1 Is there any loose or foreign material on the photoconductor unit? 2 Is there any loose or foreign material on the cartridge roll? 3 Is there any loose or foreign material on the transfer belt? Yes No Replace the photoconductor unit. See "Photoconductor unit removal" on page 4-70. Replace the print cartridge. Go to step 2. Go to step 3. Replace the transfer belt. See "Transfer belt removal" on page 4-91. Contact your next level of support. Print quality-residual image Service tip: Install a new print cartridge if available before doing this service check. Residual image can be caused by the photoconductor, cleaning blade, and other parts inside the print cartridge. Step Questions / actions 1 Is there any toner contamination on the fuser assembly? Yes Replace the fuser. See "Fuser removal" on page 4-60. No Contact your next level of support. Diagnostic information 2-59