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If you've taken the printer apart and cleaned the belt unit and everywhere else in the paper's path, then it is probably either a bad toner cartridge or the drum. Since it's multiple colors producing splatter, its most likely the drum unit. Try taking the drum out and removing all of the toner cartridges and then clean the drums and corona wires. If its still producing splatter afterward, you've got yourself a bad drum.
I had a similar problem in that after changing one of the cartridges (I bought a whole set), the message "cannot rotate cartridge" appeared. I tried pressing the cartridge in more firmly and may have caused the carousel to rotate a little in the process. I cycled the power which seemed to clear the error message and allowed me to select the next cartridge to change, but upon opening the door to change it, was unable to remove the old one as it was positioned a little too high. I eventually cleared the problem by manually rotating the carousel by pressing in and holding the carousel release (see arrow) while rotating the carousel downward slightly, to line the cartridge up as it appears in this picture. Then powered it back up and was able to do the normal cartridge replacement procedure for the remaining cartridges without further error messages.
Remove the cartridge and clean the right side connectors and there is a
chip in front of the cartridge please clean that one and clean the
connectors by using the soften yellow cloth. Now u insert the cartridge,
then now the machine will accept the toner cartridge
since you dont list the model of your machine, it makes it a little hard, but most likely its your drum that is causing the problem (maybe the toner too) if you are not experiencing problems with the other colors.
Look through the menus on the printer for a setting for "Low Toner" -- the choices of what to do are usually either "continue" or "stop" or something similar (my 2430DL has this option setting) -- set this option to "Continue". My 15 year old HPs also have a similar setting. However, this will keep it printing when the black runs out, so you will need to check your print production run visually as you go along to make sure the quality is what you need
Take a tissue and clean the area where the toner is. Do not use anything wet at all. Just a soft tissue. Re-install toner and try again to print. If the problem continues, it may be a leaking toner catridge. The cartridge has a cleaning blade built in and it may be deffective. Try a new toner cartridge if so.
The control panel display will indicate which toner is out; K = Black M = Magenta Y - Yellow C = Cyan
Also, the orange indicator light will flash.
Generally, each toner will provide about 1,500 copies depending on the intensity of the specific color. The toner drums, on the other hand, generally provide more than 20,000 copies each and need not be changed that often.
When you change a toner, included with the toner is a little alcohol wipe that you use to clean the toner sensor. This is a small LED located along side the toner holder. Make sure ALL toner waste/dust is cleaned off the sensor before installing the new toner.
Also, while I hate to state the obvious, make sure you removed the tape from the new toner before inserting it. Last, make sure you lock the toner in place with the blue lever. And it never hurts to shake the toner a little side to side before inserting it just in case the toner has gathered at one end.
Last, there is a utility included with the printer that lets you access the printer's information via your computer. This will tell you exactly how much toner is left in each cartridge and the life remaining on the drum.
first, if you refilled your toner, the printer will always tell you, that you are not using original toner and red light will blink. second, if printer tell you every time to replace different color, then you need to clean a chip reader and chips on toners. take out all toners and pc drum. under toner rack there is a chip reader, clean it with pressure air and reinstall