Not want to read the new toner

How to fix the Canon Check Ink U075 or U076 Error Message This may help

Very, very common issue on these normally related to a problem in the toner hopper assembly itself.

If this just started after you replaced the toner cartridge, one would have to say that it is a bad toner cartridge.
Print something that smudges. Pull down the front cover and look at the cartridges. Pay attention to the top one(black).
Look at the drum on that cartridge. You should see the toner sitting there. Compare it to the other cartridges which should be clean.

Toner cartridge is defective - replace it

Most all new color laser printers employ an RFID reader adjacent to each of the 4 tomer cartridges. There is a unique RFID chip inside (under a small blue slide cover) each toner cartridge. Whan a new toner cartridge is installed, the printer "knows" such and begins a "countdown" of the number of prints that are made which utilize the toner in each of the 4 cartridges. Once a toner cartridge has "processed" the predetermined number of copies you will get a warning that the cartridge is almost empty and must be replaced. After an additional predetermined number of copies are processed, the integral computer within the printer will shut down the printer until the cartridge is "replaced". If you simply "refill" the same or original cartridge and re-install it into the printer, the same RFID chip is in the cartridge and the computer will not reset the print "counter", allowing you to start printing. You have to obtain another couple of new or "re-filled" cartridges (of the same color or black) from an outside source. The printers' internal computer does not keep a complete running list of all of the RFID chips that have been installed and used in the printer (maybe 2 or 3) and then then it is "1st in / 1st out" of the limited RFID memory of the printer. I have been unable to obtain a "Service Manual" for the OKI C3400n printer to determine how to do a "hard reset" of the internal computer. I know there is a way which would allow the "refilling" of the toner cartridges without having to buy an additional 2 of each color.

changed black K cartridge with new one but still shows black toner empty! Could toner cartridge be faulty?

service your printer and change roller taplon tape and fuser aseembley.

The error code 54.18 means that there was an error with black toner cartridge toner level sensor. Try taking the cartridge out and shake it a little to loosen up the toner inside, make sure all of the cartridge metal electrical contacts are clean and try it again. If it still has a problem you should try a new black toner cartridge. If that doesn't change things then you may need to replace the DC controller.

1. clean the cartridge properly.
2. take the waste toner from waste section
3. change drum
4. change chip
5. do it this i think your probalem is solved

new problem

• changed black cartridge but print color mixed print out

what i do? send the details to my email

I had the same problem and found that one of the toner cartridges must have not been seated properly. I removed the black toner cartridge and re-fitted it. The printer now works fine again with no errors. 17H is a code relating to a fault in the rotation ......... possibly one or more toner cartridges need checking. Use the menu on the printer to turn it to the appropriate position (i.e. engine menu then select replacement of whichever toner you are checking).
Hope this fixes your as well.
Chris