Review on HaloFox Compatible Drum Unit Replacement for Brother DR820 DR-820 DR 820 | Suitable for MFC-L5900DW HL-L6200DW HL-L5100DN MFC-L5800DW MFC-L5700DW HL-L5200DWT MFC-L6700DW HL-L5200DW Printers | Black, 1 Drum by David Dortch

After several thousand copies on my Bother HL-L5100DN laser printer, a black checkered border appeared on the left side of the page and the pages were misaligned side to side. The slide button on the photoconductor was still sticking. Replacing the toner didn't change anything. The solution was to buy another drum. I bought a block from LD. After one page, the black border disappeared, the pages registered correctly, and the printer functioned normally again. HaloFox might be compatible, but it's a bunch of junk. Don't buy this!