Print Quality Defect: Dirty Paper Edge

Single-Function: C2240, C2425, C2535, CS421, CS521, CS622

Multifunction: CX421, CX522, CX622, CX625, MC2425, MC2535, MC2640, XC2235, XC2240, XC4240

A thin line of toner seen down the very left side edge of the page (simplex printing). Predominately yellow but can be any colors. This issue may require a stack of pages to see if the line is on the very edge of each sheet. See sample image below:

This issue happens in the following circumstances:

• Mid-late life on High Yield Imaging Unit (Earliest seen in ~25K pages, most in 100K pages or later)
• Letter width media (A4 and narrower media do not exhibit issue)
• Printing from input option trays only
• Simplex side only
• Skewed pages can be worse

1. Try printing letter width media from tray 1 if possible.



2. Ensure that the tray side guides are tight against media.



3. Should the issue persist, replace the specific color Developer Unit.

Have the following available when calling Lexmark Technical Support;

• Printer model(s)
• xref_FA1289_xref
• Toner/imaging unit/waste toner bottle part number and serial number

LEGACY ID: SO8630