Lexmark 40X6788 Developer Unit Assembly toner cartridges (genuine brands)

Genuine Lexmark developer unit for high-volume

The Lexmark 40X6788 developer unit is a brand-new OEM component built for the Lexmark C935DN, C935DTN, C935DTTN, C935HDN, X940e and X945e. It replaces the developer assembly inside these laser devices and is rated for approximately 150000 pages. Offices and print rooms that run these specific models use this unit to maintain consistent colour output over long duty cycles.

Single part number replaces the complete developer

The package delivers the entire developer unit under part numbers 40X6788 and 40X3742, so no separate rollers, gears or toner bottles are required. Installing the genuine assembly restores the factory calibration for each colour plane and avoids the alignment drift that can appear when individual sub-components are swapped. The unit is supplied new and ready to install without additional configuration software.

Verify the exact model name on your printer before

This developer unit fits only the six Lexmark models listed above; other C935 or X940 variants with different suffixes are not supported. Check the label on the rear or inside the front cover to confirm the full model string matches one of the compatible products. The printer must be powered off and cooled before the old assembly is removed and the new unit seated.