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This is usually caused by defective, or empty, toner cartridges. A good cleaning and replacing the old waste toner drum as will as the defective cartridge with a certified manufacturer's cartridge usually fixes the problem.
Your toner cartridge is probably getting low. Toner is actually a powder, and it can get settled during shipments, bringing it home, etc etc.
Take out the black toner and give it a gentle side-to-side shake a few times and pop it back in.
That should help.
The voids and blotches can be a bad black pcu, the voids san also be toner on the glass slat obove the pcu,s there are 4 slats one for each color, on the pcu itself on the upper side is a narrow long opening, the glass slat is above this opening when the pcu is in the printer. It will take a flashlight to see any toner on the glass.
Depending on the age of the model, it could be a couple of things. ***Never touch the drum or expose it to bright light*** The drum unit is bad. It's the shiny brightly-colored large roller in the center of the machine. On most recent smaller machines like this on it's integrated into the toner cartridge. Check it out. If it has toner build up on the ends, it's bad. or The corona wires need cleaning. Some machines have a small slide that moves from one side of the printer to the other which cleans the hidden corona wires. It's usually brightly colored.
The corona wires are also integrated into the toner cartridge in many smaller machines