Hello Foxvalenth, you have the problem in all four colors, therefore, it can be in the transfer belt or in the transfer roller, open the back door you will find a porous rubber roller, that is the transfer, at its ends it is mounted in two Sockets and these are secured by two clips, see if at the same end of where the fault is the clip is released and the transfer does not rotate smoothly and in position, it also sends an intermediate impression test to know if the fault occurs in the band, that is, send an impression, when the blade begins to come out of the fuser, turn off with the power key, open the back door and carefully remove the paper, open the front door and remove the cartridge tandem, remove the last cartridge and visualize in the transfer band that is below that last cartridge and see if the fault is already in the band, it can also be that a roller inside the band is unhooked at the rate of a lock, if you need manual Disarmament service tell me, I await your comment, best regards