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See “What Kind of Paper can I Use?” in Chapter 1. • Select the ‘Thick paper mode’ in the printer driver, or use thinner paper than you are currently using. • Check the printer’s environment because conditions such as high humidity may cause this situation to occur. All black • Clean the primary corona wire of the drum unit. See "Cleaning" in Chapter 5. • The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5. 6-13 CHAPTER 6 TROUBLESHOOTING Image Defect Samples Recommendation 94 mm 3.7 in. 94 mm 3.7 in. White Spots Printed pages have white spots in black text and graphics at intervals of 94 mm (3.7 in.). 94 mm 3.7 in. 94 mm 3.7 in. Black Spots Printed pages have black spots at intervals of 94 mm (3.7 in.). If the problem is not solved after printing a few pages, the drum unit may have glue from label stock on the OPC drum surface. Clean the drum unit as follows: 1. Position the print sample in front of the drum unit, and find the exact position of the image defect. 2. Turn the drum unit gear by hand while looking at the surface of the OPC drum. 3. When you have located the mark on the drum that matches the print sample, wipe the surface of the OPC drum with a cotton swab until the dust or paper powder on the surface comes off. 6-14 CHAPTER 6 TROUBLESHOOTING Image Defect Samples Recommendation 94 mm 3.7 in. 94 mm 3.7 in. White Spots Printed pages have white spots in black text and graphics at intervals of 94 mm (3.7 in.). ! Caution Do not try to clean the surface of the photosensitive drum with a sharp object, such as a ball-point pen, etc. • The drum unit may be damaged. Install a new drum unit. See “Replacing the Drum Unit” in Chapter 5. 94 mm 3.7 in. 94 mm 3.7 in. Printed pages have black spots at intervals of 94 mm (3.7 in.). 6-15 CHAPTER 6 TROUBLESHOOTING Image Defect Samples Recommendation ABCDEFGH abcdefghijk ABCD abcde 01234 Black Horizontal repetitive defects Toner scatters and stains the printed page. • The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5. • Make sure that you use paper that meets specifications. See “What Kind of Paper can I Use?” in Chapter 1. . Note • If you use label sheets for laser printers, the glue from the sheets may sometimes stick to the OPC drum surface. Clean the drum unit. See “Improving the Print Quality” in this chapter. • Do not use paper that has clips or staples because they will scratch the surface of the drum. • If the unpacked drum unit is subject to excessive direct sunlight or room light, the unit may be damaged. ABCDEFGH abcdefghijk ABCD abcde 01234 White horizontal stripes • Make sure that you use paper that meets the specifications. A rough surfaced paper or thick media can cause the problem. • Make sure that you select the appropriate media type in the printer driver. • The problem may disappear by itself. Try printing multiple pages to clear this problem, especially if the printer has not been used for a long time. • The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5. ABCDEFGH abcdefghijk ABCD abcde 01234 Horizontal Lines • Clean the printer interior and the primary corona wire in the drum unit. See "Cleaning" in Chapter 5. • The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5. ABCDEFGH abcdefghijk ABCD abcde 01234 Black Vertical lines Printed pages are stained with toner or have vertical stripes. • Clean the primary corona wire of the drum unit. See "Cleaning" in Chapter 5. • Make sure the primary corona wire cleaner is at the Home position (). • The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5. • The toner cartridge may be damaged. Install a new toner cartridge. See "Replacing the Toner Cartridge" in Chapter 5. Make sure that a torn piece of paper is not inside the printer covering the scanner window. • The fixing unit may be smudged. Call Customer Support. 6-16 CHAPTER 6 TROUBLESHOOTING Image Defect Samples Recommendation ABCDEFGH abcdefghijk ABCD abcde 01234 White Vertical streaks • You may clear the problem by wiping the scanner window with a soft cloth. See “Cleaning” in Chapter 5. • The toner cartridge may be damaged. Install a new toner cartridge. See "Replacing the Toner Cartridge" in Chapter 5. ABCDEFGHabcdefghijkABCDabcde01234 Page skew • Make sure the paper or other media is loaded into the paper cassette correctly and that the guides are not too tight or too loose against the paper stack. • Set the paper guides correctly. Make sure that the tips of the paper guides fit into the slot correctly. See “Printing on Plain Paper from the Paper Cassette” in Chapter 1. • If you are using the manual feed slot, see "Printing on Plain Paper from the Manual Feed Slot" in Chapter 1. • The paper cassette may be too full. See " Printing on Plain Paper from the Paper Cassette " in Chapter 1. • Check the paper type and quality. See "...

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