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I have a brother MFC 3240C. My Black ink stopped printing(initially printed horizontal faded lines and gradually got worse), the other colors were printing fine. I tried cleaning numerous time( 50 -100 times over 1-2 weeks ). Still no improvement. The way I print now is:
1. I go to Printer Properties
2. Change Media type from "Plain Paper" to "Inkjet Paper".
3. Change Quality to "Photo".
This takes a long time to print 1-2 minutes per page. However, this works for me since this is my Home printer and use it for printing only few pages here are there.
If you lay the print on the exit tray face up and open the cover. Look on the encoder strip, the clear plastic strip behind the carriage, you should see an ink or grease spot right above where the bad spot on the page is. Wipe the encoder strip with Q-tip or wiper with alcohol. Prints should look better.
The print heads don't appreciate being out of ink so the Brother printer has sensors to prevent that but the tape defeated that prevention. Maybe more cleanings or maybe a cartridge with printhead cleaning solution will help. Otherwise, I fear a new printer.
The imaging bar has speck of dust on it.
Turn printer OFF.
Open the printer.
Pull out the transfer roller. Should have a big green handle. Do not touch the roller.
Look inside for a shiny rectangular block about 5inches x 0.5 inch.
This is the imaging bar. Using a lint free cloth with no chemical and no water, gently wipe this bar to remove any specks of dust/paper specks.
Put roller back.
Close the printer.
Turn printer ON.