Table 7-21. Horizontal Black Lines Possible Cause Action Defective Laser Scanner Assembly or Engine Controller Board. 1. See the “Repetitive Defect Ruler” on page 7-73. 2. Reseat connectors on the Laser Scanner and Engine Controller Board. 3. Replace the Laser Scanner Assembly followed by the Engine Controller Board, if necessary. Table 7-22. Horizontal Smudges Possible Cause Action Paper path contamination or damage. 1. See the “Repetitive Defect Ruler” on page 7-73. 2. Check the Toner Cartridge and replace it if necessary. 3. Check the Fuser and replace it if necessary. Table 7-23. Horizontal White Lines Possible Cause Action 1. Check the Toner Cartridge and replace it if necessary. 2.
Check the Fuser and replace it if necessary. 3. Replace the Laser Scanner Assembly, followed by the Engine Controller Board, if necessary. Troubleshooting the Printing System 7-67