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The black print head is clogged. The reason why the black is clogged and not the photo black or any colors is that the black is pigment ink and the photo black and colors are dye based ink. The pigment ink is a particulate formulation that binds up when water is evaporated out of the ink. You need to buy a new print head the fix the problem. You can buy a new print head for $75 from precision roller.com.
Sounds like a badly clogged nozzle. If you are using aftermarket/refilled cartridges, the changes are the ink is not up to manufacturer specs and has dried and clogged the nozzle. The best way to clear this is to take a new black ink OEM cartridge and run the deep cleaning a number of times (at least 3) to see if the nozzle can be cleared. If you continue to use non-OEM cartridges, I would keep a set of OEM cartridges around for nozzle clearing purposes. Also, take the aftermarket ink cartridges back to the vendor and either get an upgraded cartridge or refund.
Let me know if this corrects the problem. Thanks.
I have to ask this question of you, just to make sure this is not an issue.Are you using a factory new ink or toner cartridge? Please consider the following: If you are using a refilled (theabsolute worst possible choice) or third party cartridges (2nd. Worst possible choice) that may well be your problem.Most manufacturers build logic into their products to prevent the use of “Other Equipment Manufactured” cartridges as well as re-filled cartridges. They do this to prevent problems from contaminated inks or toner causing problems with print quality or damaging the physical printhead or photo conductors. If you are using factory new ink or toner cartridges, then please call the manufacturer’s Technical Support for assistance with the warranty on the cartridges Don
The black is always the first to wear out on the printhead. If you are using a refilled cartridge check the side of the cartridge, if you can see ripples near the hole at the bottom then the blotter material has been pushed up inside and can't contact the filter in the printhead. If all is good you will need a new printhead, QY6-0049-000
take cartridge to a ink refill store(cartridge world,etc)they can test for free,also make sure that your contacts are clean were cartridges mate with machine,clean with alcohol,qtip,and canned air!! GOOD LUCK!!!
I had removed and reinstalled the empty 3e cartridge. Sorry for the Confusion. I hadn't put a new 3e cartrige in until today. Them I ran " deep clean" twice. The printer works fine. I still don't understand why the printer wouldn't print color, when I was had set the printer to print in color when my 3e cartridge was empty and all colors including the 6 black showed full.
I bet you are using non genuine ink, the MP780 will not put up with that ink, you will need a new printhead and maybe a purge unit.
Take the machine to your ink supplier and get him to fix it as he supplied the ink