5550dn streaks on front an back of paper

[rossmilstein]

There are two problems here.  One is I get yellow (and possibly) some blue on the front of each print out on the right.

The other is some grey lines on the front and back.

I have replaced the fuser kit and transfer kit.  On the attached image you will see a yellow streak.

I can wipe this off.  But right after I close up the printer, it will appear again.

Overall the printer has been great and I have replaced so many parts that I feel I am close.

Any ideas for the next thing to try?

I'm very grateful.

:Ross

[davidzuts]

You missed the obvious.  You have a bad yellow toner cartridge.  Post a sample of the black lines which could also be a toner issue.

[rossmilstein]

I may have a problem in addition to the yellow.  The blue may be not working as well (see the photo) for the bluish/yellowish/greenish streak. But I don't see obvious powder from the blue.  What I do also see is that the back of the paper has grey streaks where the blue is streaked on the front.  I have changed out the transfer kit and the fuser kit.

[davidzuts · Accepted solution]

Sure looks like the cyan and yellow toners are bad.  To test go to the diagnostics menu of the printer and choose the item disable cartridge check.  Now when the printer say ready, diagnostics mode, open the toner door and remove the cyan and yellow toners.  Do the same supply page printout, you will only get magenta and black but the defect should be gone which proves the toner is the issue.  As to the black marks open the door and also remove the black toner so only the magenta remains in the printer.  Do the same page again and see if those marks are gone.  If they are then you black toner is also bad.  Also are these hp oem toners or refills.  The reason I ask is the serial number of the cyan is not correct and I am sure these toners are very old.  Sorry for the bad news since I know these toners are very very expensive. The real shame is you replace the fuser and transfer kit which are also not cheap and the old ones may still have been good.

[rossmilstein]

I ordered yellow and cyan toners.  I will know soon if this is solved.  I now know how to diagnose in a methodical way, so I am much better off than I was before.  Thank you all for taking the time to really get into my situation in detail.  I am very grateful.  Truly.  Have a great day.