Step 3 ![](https://publications.lexmark.com/media/ids_assets/images/transparent.png) Remove the color imaging kit, and then remove the black imaging unit. Warning—Potential Damage: Do not expose the color imaging kit and black imaging unit to direct light for more than 10 minutes. Extended exposure to light may cause print quality problems. Warning—Potential Damage: Do not touch the photoconductor drum under the color imaging kit and black imaging unit. Doing so may affect the quality of future print jobs. ![](https://publications.lexmark.com/media/ids_assets/images/transparent.png) Insert the black imaging unit, and then insert the color imaging kit. ![](https://publications.lexmark.com/media/ids_assets/images/transparent.png) Print the document.
Do horizontal white lines appear on prints? | Contact customer support. | The problem is solved. |