![](/images/new-backgrounds/1206338/206338255x1.webp)
6. Troubleshooting
| Dark lines in halftone areas at 75mm Intervals |
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| Using the machine in a room where humidity level is too low may cause dark lines in halftone areas at |
| 75mm intervals. This is because |
6 | the surface of the drum. |
| Selecting [On] for [Low Humidity Mode] under [Machine Settings] may help to prevent these lines from |
| appearing. |
When the humidity mode setting is enabled, the drum is rotated slightly every 15 minutes. This keeps the light sensitivity constant across the entire surface of the drum.
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