Lexmark E320 Service Manual - Page 114

4500 Paper "trees," wrinkles, stacks poorly or curls FRU Fuser backup roll Action This problem is most likely due to a worn backup roll. A worn backup roll causes the printer to run hotter than required for the media being printed. Excessive heat can cause paper treeing problems, poor stacking, or curl. Paper skews or jams at registration roll FRU Registration roll assembly Lower registration roll Registration roll bushings Action The registration roll contains a spring-loaded paper "stop" that deflects and aligns the paper as it is fed. • Verify that the "stop" pivots freely and the springs fully return it after the paper passes. • Verify the rolls are in good condition and clean. • Replace unit(s) as necessary. 2-84 Service Manual