Hello all,\n\nI have been trying to find assistance on a couple different forums. I have posted to reddit and the Xerox support forums. So far, there hasn't been anyone available.\n\nI had this issue with the black toner where the blacks would have a sort of diagonal streaking pattern when printed. After trying a few things, I thought that there might be some sort of contamination issue. SO, I dissembled the printer and removed the housing for the transfer drum and cleaned out the housing. When I placed it back in, there was no black being printed. After doing some toner refreshes, IU refreshes) the black was able to come out but now it is smeared on the paper and it it very light. All of the other colors are ok. I disassembled the unit and I noticed that the toner for the black is not sicking to the transfer drum unlike the other colors. It is not spiky but rather clumps to the transfer drum. After some online research, I came to the conclusion that it is either the IU or the HVPS. In order to eliminate one of the two options, I disassembled the pritner again but this time, removed the HVPS. I soldered two wires onto the board. One on the high voltage for the black and another on the high voltage for a working color.\n\nWhen I put everything back on, I start up the printer. Now, I am getting an error 116-364 on startup. Again, doing some research online, I need to either replace the MCU board, the IP board, or remove the internal battery (I don't think that there are any jobs corrupting the printer since I do not have it plugged into any computer but hey, you never know)\n\nI am at a pointer where I really could use some help and some guidance repairing the printer. Or at least coming to the pointer where I need to simply buy some new hardware. \n\nWhat could be some solutions on fixing the error code? Any thoughts on what is wrong? \n\nAlso, what could be wrong with the black toner? Would I really need to replace the IU?