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Magenta and cyan will not print on my hp officejet pro L7590 -- it started with a paper jam that was corrected - ever since then only the yellow and black will print on the paper -- printheads are good and ink cartridges are full -- printer alignment test however fails and again only yellow and black shows up on the diagnostic sheet

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Same thing happened to my printer hp L7590. Printed diagnostic, only black and yellow printed; diagnostic for printhead health Ky=good, MC= good. Only Hp products ever used. Uplugged, & discharged static, cleaned copper parts of printhead. Still no fix. On visual examination of floor of printhead compartment rectangular pad ( approx 1/4" by 1/2") is missing. I can only guess that during the paper jam, somehow the pad got caught up and went awol. Not sure what to do now.

Posted on Oct 10, 2011

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Why wont cyan and yellow print at all?


Use your machines built in programme to clean the ink jet heads

Feb 17, 2016 | HP Officejet Pro L7680 All-In-One Printer

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HP All-In-One 4500 prints YELLOW when Black is SELECTED Could this be a PRINT HEAD PROBLEM?


Hi,
The inkjet printers print colors as they combine the major 4 colors contained in the cartridges CMYK (or said in words cyan, magenta, yellow and black) in some proportion.
If you print black the printer gets ink from the black cartridge only. If the black cartridge is empty some devices start to print black as a combination of the colors in the color cartridge - for example gets some of the cyan, gets some of the magenta, gets some of the yellow.
In your case maybe some of the other colors are empty too (or the nozzles are clogged) and the printer cannot prepare the correct mixture of colors to start printing black.
I suggest you to change both black and color cartridges.
Hope this helps.

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CYAN AND YELLOW CARTRIDGES ARE NEW OEM BUT WILL NOT PRINT, I GET BLACK AND MAGENTA BUT NOT CYAN OR YELLOW


Clean everything w/ slightly alcohol dampened q-tips. Run Cleaning program on printer. Align cartridges.

Oct 01, 2009 | HP Officejet Pro L7680 All-In-One Printer

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My HP Officejet Pro L7780 All-In-One InkJet Printer was jammed with paper. I believe I got it all out and now the display reads" Printhead problem- the following printhead has a problem: magenta/cyan...


There are two possibilities here Joanne, first, it could be a false error message or else second, the Cyan/Magenta print head has gone bad.Try the following:
1. Take the Cyan/Magenta printhead out. Remember, the printhead...not the cartridges.
Clean the copper contacts with a Q Tip, moistened with plain water. Wait till it dries, put the printhead back in.
2. If this does not resolve the issue, unplug the power cord from the back and press and hold the power cord for 30 sec. This will drain all the static charges. Plug it back after a couple of minutes and see if the error message re appears.

Jul 02, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

2 Answers

HP Officejet K850 pro prints black ok, but colors are poor


I read earlier that black and magenta were printing but not cyan or yellow.....HP says to gently wipe the side of the electronic band but not the bottom, I did all of the above...and the printheads carefully, no change w/ the printout from "clean printheads"...the cyan had an occasional blue line(very fine) and there was no yellow.

So I trickled warm water over the cyan and yellow printheads....then thought what the heck, got a bowl of warm water and swished the printheads half submerged. They print perfect now I have the reds, yellows, greens and all the colors back w/ the clean printhead option and printed a coupon, it was perfect.

I hope it's not a short term fix...I developed the problem when I didn't print for a long time, hope this helps someone, Cyn

BTW, I flashed a light down in the recepticle for the cyan and yellow printheads and they were gunky w/ blue and yellow gook, so I clean that out w/ a damp lint free rag....paper towels shredded and I had to carefully remove the remnants.

Jun 17, 2009 | HP Officejet Pro K850 InkJet Printer

1 Answer

I corrected the paper jam but the message still says there is a paper jam, cannot see any paper, how do I reset so that I can print?


Try turning off the printer and turn off your pc, now restart both and see if this helps. Any other questions please post back as everyone is more than happy to help you.

Mar 25, 2009 | HP Officejet Pro L7590 All-in-One InkJet...

1 Answer

Changing the printhead


FYI: The L7590 doesn't have any tape on either the cartridge or the printhead.

Right couple of things here...

1. The printheads in the L7590 are either K/Y (black/yellow) or C/M (cyan/magenta)... There's no single black printhead unless of course this is not an L7590 we're discussing here.

2. The cartridges ARE individual with K, Y M C (Black, Yellow, Magenta and Cyan).


It's likely that the printer has one of the following faults.
  • Chip contacts and/or chips on the cartridges are soiled and/or damaged. Try checking for ink on chips and contacts in the cartridge bay

  • The little white oval pump in the bottom of the cartridge bay has become disconnect or broken. This is used by the printer to pump ink into the printhead but it also detects pressure variations and has a logic circuit which declares low pressure as "no ink".

If the problem is the latter then you need to get the printer serviced and/or repaired at a service center.

If it's the former you should be able to fix it yourself.

If you're using non OEM (ie: not by HP) cartridges I'd recommend getting a new OEM/HP one to test before you go for a service as some cartridges are just poorly filled and/or designed.

Hope that helps.

Feb 03, 2009 | HP Officejet Pro L7590 All-in-One InkJet...

1 Answer

Cleared paper jam &printer will not reset


I had to turn off the printer & disconnect the power cord. I also had some material that was backed up on hold from the night before that was preventing the current material from being printed & I had to go in & cancel the documents to be printed before the printer would function.

Jan 05, 2009 | HP Officejet Pro L7590 All-in-One InkJet...

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