I have konica minolta c454 and c452 when i print test half tone 255 black the print become with poar quality

SOURCE: Konica Minolta Magicolor 2300 DL

clean the machine , and change the toner.

SOURCE: "Can't Detect Genuine Toner Cartridge"

minolta printers work on "chips" if the chip atached to the cartridge is not original minolta you better change it.

SOURCE: Konica Minolta Pagepro 1350 page count or Print Config sheet?

please go printer utilty option on your pc then you can print a testpage

SOURCE: Konica Minolta Magicolor 4690MF gives 0502 error.

machine trouble 0092 service call
This happen after I cleaned the waste box for Konica Minolta Magicolor 1600W

SOURCE: My Konica Minolta MC2300DL will not print. It is

You can change the 2300's menu setting to ignore empty toner cartridges and keep printing. There are 2 steps:

Step 1:

Press Menu/Select, then "right arrow" until you see ENGINE. Press Menu/Select again and then "right arrow" until you see TONER EMPTY. Press Menu/Select and you'll see STOP. Press "right arrow" once to change to CONTINUE. Press Menu/Select.

Step 2:

Press "right arrow" until you see AUTO CONTINUE. If set to ON, press the "Cancel" button and you're ready to print. If set to OFF, press Menu/Select, then right arrow to change to ON, then Menu/Select to enter. It will say "ON IS SELECTED." Then press the "Cancel" button and you're ready to print.