Troubleshooting
77. Troubleshooting
7.1 Printing Problems – Causes and Solutions
7.1.1 Vertical Black Lines and Bands
• Description
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
1.Straight thin black vertical lines occur in the printing.
2.Dark black vertical bands occur in the printing.
| Check and Cause |
| Solution |
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1. | Damaged developer roller, deformed | 1. | Replace the toner cartridge and test |
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| again. | |
| Toner cartridge. |
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2. | Scratched surface of the charge roller in | 2. | Replace the toner cartridge and test |
| the toner cartridge. |
| again. |
3. | 3. Depression or deformation of the | 3. | Replace the transfer roller and test again. |
| surface of the transfer roller. |
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7.1.2 Vertical White Line
• Description
Digital Printer
Digital Printer
Digital Printer 
Digital Printer
Digital Printer
White vertical voids in the image.
| Check and Cause |
| Solution |
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1. | 1. Contamination of the window or | 1. | Clean the LSU window with recommended |
| internal lenses of LSU mirror. |
| cleaner (IPA) Clean the window with a |
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| clean cotton swab. If dirt is inside the LSU |
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| – replace LSU. |
2. | Foreign object inside the toner cartridge | 2. | Replace the toner cartridge. |
| or low toner. |
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3. | Foreign object, contamination or burr on | 3. | Clean the exposure window. |
| the edge of the toner cartridge window. |
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4. | If the fuser is defective, voids occur | 4. | Open the front cover and check the ribs |
| periodically at the top of a black image. |
| that correspond to the position of the |
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| voids. Remove if found. |
5. | Contamination of the OPC drum. | 5. | If the problems are not solved, replace |
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| the toner cartridge. |
6. | Depression or deformation of the surface | 6. | Replace the transfer roller. |
| of the transfer roller |
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Service Manual
Samsung Electronics