In most cases for laser printers where a streak or missing area is found, its the toner cart or path where it sits. Remove the toner(s) and shake them well, side-to-side and return. It may have a wiper to clean/swipe the toner film area, use it. Test for output, if the missing area goes away, good, if not and returns or jumps to another area, then the damage is located on the toner cart film, part of the toner cart. The fix is to replace the problem toner cart whatever, color it seems to be. The only other possible source, is the paper path has found an obstruction that either damages the toner cart or causes loss of toner of the area is question. Closely inspect and verify the paper path of exposed area when the toner is removed, there should be a clean path and/or be free of anything, use the test output to give a clue to search at. like right side, etc.. Last, all of the above is OK, but during final phase of printed where it is "fused" the fuser assy. has missing or damaged surface area, replace. Your best bet is to hope for a toner cart, thus replace. If anything else other than what's explained here, the cost will effect repair or whole replacement of printer.
My aforementioned printer is printing with magenta and cyan streaks and blobs. Theyre in the same place in each page Ive printed.
I understand I need to clean the printer somehow, but having never done it, could someone point me to a reputable guide online instead of the myriad I find through google?