Symptom
One or more white lines appear along the paper feed direction.
Cause 1
Dirty dust shield glass and/or clogged doctor gap.
| Dirty dust shield glass | Clogged doctor gap | |
| Symptom in detail | 1 or more lines of 0.1 to 1 mm width appear along the feed direction across the entire page. | |
| Cause in detail | Toner, lubricant, etc. on the dust shield glass block the laser beam exposed on the drum. | Doctor gap is clogged with foreign substances/clumps of developer, disabling sufficient transport of developer to the development roller. |
Solution | Clean the dust shield glass. | Clean the doctor blade / Replace the developer / Extend the fan operation time setting in the SP mode / Replace the development unit. |
[A]: White line
[B]: Feed direction
Cause 2
Foreign substance in the development unit.
| Symptom in detail | 1 or 2 lines of 0.1 to 0.5 mm width appear at approximately 5 to 10 mm from the leading edge. |
| Cause in detail | Image developed on the drum is scraped off by a foreign substance stuck between the development roller and the drum. |
| Solution | Remove the foreign substance. |
[A]: White line
[B]: Approximately 5 to 10 mm from leading edge
[B]: Feed direction
Flow Chart
Step 1
Step 2
*1 See Doctor Gap for details about the cleaning procedure.
Step 3