My printer stopt print black pages. If its got a coulour on the page everything is fine, but when i want to print a document just on black...its giving me a black and white patches. What to do? Thanks Milena
Try to unclog your printhead, release the printhead from the machine, take hot water in abowl, blow air on the upper black cartridge with an injection tool. At the same time put your printhead in to the bowl. Good luck
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Hi! I originally gave this fix for another post, but this might help you out too. I have an MP390 which once gave me a similar problem, but I managed to fix it and continue to maintain it using this technique. Anyway, here are the steps! :^) Outline: Open the printer as though you were going to replace the ink tanks. Once opened, with the print head centered, open the latch to release the print head. Gently remove the print head (it should come right out, even easier than the ink cartridges normally would). Take a paper towel, wet it with warm water, and then gently clean the bottom part of the print head. The bottom part is the part that will have an orange ribbon running to four metal openings that look like tiny nozzles. After wiping away all of the built-up gunk (on mine there was a thick sludge), grab a new and wet paper towel, and lightly press it against the nozzles. This should start sucking ink through the print head, and you will begin to see four distinct colors (CMYK) bleeding into the towel. Once done, lightly dry the print head off (make sure that there are no loose water droplets) and then reassemble everything. Print a test page and everything should work. If it doesn't change the ink tanks just to be sure.
Fortunately for you, Canon has made the print head on the MP390 very easy to service/remove, so cleaning is a snap.
Turn Printer On
Open Printer As If To Change Ink Tanks
Release Ink Tank Latch
Remove Print Head (Black Plastic Assembly In Which Ink Tanks Rest)
Use Wet Paper Towel (With Warm Water) To Clean Tank/Nozzle
I just ran into a similar issue with my MP390. Actually both the color and black inks were not printing very well. I would get very inconsistent printing. Fixed the problem very easily and quickly as follows:
On the top of each print cartridge, there is a small hole. Remove the print head (lift the gray bar at the front of the print head and lift out the print head) with the cartridges still in place. Holding the print head over a piece of paper/paper towel, blow into the holes on the top of the cartridges (either directly or using a straw/tube of some kind). You should get ink coming out of the botton of the print head, both color and black. Replace and print head and test print.