Oki CX2731MFP MC361, MC561, CX2731MFP Advanced User's Guide - Page 291

Symptom Horizontal lines and spots appear periodically. White area of paper is lightly stained. Periphery of letters is smudged. Cause Remedy If the interval of lines or spots is about 94 mm (4 inches), the image drum (the green tube) is damaged or dirty. If the interval of lines or spots is about 42 mm (1.5 inches), foreign materials may be present on the image drum unit. If the interval of lines or spots is about 87 mm (3.5 inches), the fuser unit is damaged. The image drum unit has been exposed to light. The paper feed path is dirty. The paper contains static electricity. The paper is too thick. The toner is low. The LED heads are dirty. The paper is unsuitable. The paper is moist. Lightly wipe the image drum with soft tissue paper. Replace the image drum unit if it is damaged. Open and close the top cover, and print again. Replace the fuser unit. Place the image drum unit back into the MFP and leave it for a few hours. If it does not solve the problem, replace the image drum unit. Print a few test copies. Use paper stored in proper temperature and humidity conditions. Use thinner paper. Replace the toner cartridge. Wipe the LED heads with soft tissue paper. Use recommended paper. Replace it with new paper. 291 - Issues: Print Issues MC361/MC561/CX2731 MFP Advanced User's Guide