This specific defect with vertical faint bands (NOT FINE LINE STREAKS) is likely due to some amount of contamination that has, over time, accumulated on a component within the printhead or laser scanning unit in the device. Replacement of supplies and other components will likely see little to no improvement for this issue because the accumulation has to be removed. Some potential sources of the contamination could be from:
- Non-genuine Lexmark Supplies / Refilled Cartridges / ‘Compatible’ Supplies
- Paper debris and fibers
- Other loose particulates in the air
Non-genuine Lexmark Supplies / Refilled Cartridges / ‘Compatible’ Supplies
Use of Non-Lexmark supplies can result in damage to other components resulting in multiple failures within the system (thus producing degraded print quality) including, but not limited to, the imaging unit, printhead, fuser, transfer system, and paper feed reliability.
Paper Debris and Fibers
In most cases, this is not a concern, but some media can produce more debris than others. (Different media types are processed in multiple ways.) Debris from the media can be carried into the printer and electrostatically attracted to specific components. The potential level of contamination can depend on the material, any extra finishing steps like perforations, the manufacturer’s process controls and quality requirements, and storage and usage environments for the media.
Note: Loose debris found in the back of a paper tray generally indicate that the media being used has a higher propensity to deposit debris within the printer.
Other Loose Particulates in the Air
Fans inside the printer circulate the air from outside the printer through it in order to cool those components that get extremely hot. This prevents damage to the components. If the air contains a lot of dust or other foreign particulates, these can also contaminate some of the surfaces inside the printer, thus potentially leading to this issue. A cleaning service might be required. Lexmark does not recommend the use of compressed air for any cleaning but rather fine particle vacuums in order to keep from contaminating other parts of the printer.