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An sc400 error means the toner mark sensor needs to be cleaned. Cleaning this sensor is easy:
Open the top cover and remove the cyan toner cartridge. You'll see a long black lever with a sort of handle that pokes upward -- slide this lever ONCE to the left, and then it should slide back into place.
Now replace the cyan cartridge and close the cover, and your printer should be fine. (If the error doesn't clear, turn the printer off and back on and it should go away.)
Cheat the front door interlock and watch the toner bottle to see if it is turning. If not, could be a bad toner drive motor/drive assembly. Otherwise, remove and disassemble the toner hopper and clean it up. Make sure the four clear 'scooper' tabs are attached on the back of the receptacle that fits around the top of the toner bottle. Otherwise, just purchase a new toner hopper, they are cheap.
Hello sir; the error code you display is toner senser problem, now the first thing you have to do is make a full color copy find out which color missing then pull out developer unit from missing color the senser right underneath, replace it.