MX_2700N black on reverse side of paper

[rightbrained]

My MX-2700N is printing a large black bar on the reverse side of the first couple sheets of a run. The black is about 1/3 of the page in length. It happens from both the trays and the bypass feed.

If the run is interrupted for automatic quality check, the first 2 sheets again come about black on the reverse.

I have recently replaced the black toner. The fuser rollers are not getting dirty. The waste toner catch is also new.

I run a lot of card stock through the bypass.

[Foxhound]

try swapping your drums black and yellow ex. There could be a contaminates on the erase lamp saw grid. there could also be a toner build up on the fuser housing above the rollers which will dry gel up and drip down on the upper fuser roller, have you checked the web it may also have extensive build up. good luck

[lky1978]

try swapping your drums black and yellow ex. There could be a contaminates on the erase lamp saw grid. there could also be a toner build up on the fuser housing above the rollers which will dry gel up and drip down on the upper fuser roller, have you checked the web it may also have extensive build up. good luck

change new bk dv, bk dr ,dv cleaning seal, main grid.
make full maintenance calibration ll help.
make sure firmware up to date