Lexmark E320 Service Manual - Page 119

Partial blank image/white spots (no periodic pattern) 4500 FRU Toner cartridge (not a FRU) Fuser backup roll bearings (and springs) Paper (not a FRU) Action Remove the toner cartridge and gently shake the assembly to evenly distribute the toner. If toner cartridge is low, try a new one. Check left and right backup roller springs and backup roller to ensure adequate even pressure is applied to the fuser hot roll. Make sure recommended paper is being used. Variation in image density horizontally across page FRU Toner cartridge (not a FRU) Transfer bearing Transfer roll Action The charge roll may have an unbalanced pressure against the photoconductor (PC) drum. Open the cover about two inches and observe the charge roll against the PC. It should be free from binds and resting against the PC. Try a new toner cartridge. Check the springs in the left and right transfer roll bearings. The bearing assemblies should support the transfer roll, applying even pressure to the PC drum. Replace either or both transfer roll bearing assemblies if the springs show signs of damage or fatigue. Inspect the transfer roll for signs of wear, damage or contamination. Replace as necessary. Diagnostic information 2-89