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After installing my new toner cartridge in my Brother printer, why is the cover difficult to close?

  • Author:

    (Precision Roller Tech)
  • Date:

On Brother printers using the TN750 and TN720 cartridges, giving extra attention to a simple step can ensure a smooth toner replacement operation.

The Issue

When closing the cover after installing a new toner cartridge, some users have reported that the cover is difficult to close. This affects the following models: Brother DCP 8110DN / 8150DN / 8155DN, HL-5440D / 5450DN / 5470DW / 5470DWT / 6180DW / 6180 DWT / and MFC 8510DN / 8710DW / 8810DW / 8910DW / 8950DW / 8950DWT.

The Cause

Various brands of toner cartridges for these particular models utilize slightly different latching mechanisms to secure the toner cartridge to the drum unit. These differences may allow the toner cartridge or drum unit to seem like it is fully inserted when it is not. If either of these is not completely seated, the cover will be difficult to close.

The Resolution

Be sure that the toner cartridge is securely seated in the drum unit, and then firmly seat the drum unit into the printer before closing the cover. Please note the difference shown in the following photos.

TN720/TN750 drum cartridge not fully inserted into Brother printer.

TN720/TN750 drum cartridge fully inserted into Brother printer.

TN720/TN750 cartridge not fully inserted and fully inserted.

Additional Notes

The images below note the differences in the latching mechanisms on the genuine Brother brand toner cartridge versus compatible brand models.

Genuine Brother cartridges:

Installing genuine Brother cartridge into drum unit. The mechanism clip should latch and properly secure the cartridge into the drum.
 

On genuine toner cartridges, the latching mechanism clip is blue in color and slightly different in design when compared to other brands of the same cartridge. The latch also secures itself to the drum from the front end of the mechanism.

Compatible toner cartridges:

Installing compatible cartridge into drum unit. The mechanism clip should latch and properly secure the cartridge into the drum.
 

Compatible cartridges have other latching mechanisms. Our type of compatible cartridge includes a light green latch that protrudes from the rear of the cartridge. This particular latch attaches itself to the drum from the rear of the mechanism.

Side-by-Side Comparison:

Close-up view of compatible TN720/TN750 mechanism. Close-up view of genuine TN720/TN750 mechanism.
 

The above photos depict a side-by-side comparison of two common latch mechanism designs.

Publisher: Precision Roller