TROUBLESHOOTING
4.2 Bad image
4.2.1 Vertical Black Line and Band
• Description
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
1.Straight thin black vertical line occurs in the printing.
2.Dark black vertical band occur in the printing.
| Check and Cause |
| Solution |
1. | Damaged develop roller in the Developer. | 1. | If causes 1 and 2 occur in the developer |
| Deformed |
| cartridge, replace the developer and try to |
| blade. |
| print out. |
2. | Scratched surface of the discharge roller | 2. | Replace the transfer roller if occurred as |
| in the developer. |
| No. 3. |
3.Partly depression or deformation on the surface of the transfer roller.
4.2.2 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. | Foreign matter stuck onto the window of | 1. | Foreign matter stuck onto the window : |
| internal lenses of LSU mirror. |
| Clean the LSU window with recommend- |
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| ed cleaner(IPA) Clean the window with a |
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| clean cotton swab. |
2. | Foreign matter or toner particles between | 2. | Foreign matter in the LSU : Open the |
| the developer roller and blade. |
| cover of LSU and clean with a cotton |
| (In case the life of the developer has |
| swab on the surface of the reflex mirror. |
| been expired, white lines or light image |
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| occur in front of the image.) |
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3. | It may occur when Burr and foreign sub- | 3. | No 3. : Remove the foreign matter and |
| stances are on the window of the devel- |
| burr of the exposure window. |
| oper frame. |
| (Developer cartridge) |
4. | If the fuser is defective, voids occur peri- | 4. | No. 4. : Open the front cover and check |
| odically at the top of a black image. |
| ribs that corresponds to the position of |
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| the voids. Remove if found. |
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| 5. | If the problems are not solved, replace |
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| the developer cartridge. |
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