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[QUOTE="dgrrr, post: 219194, member: 17628"]
My understanding is that when I get horizontal white lines cutting thru color or black printing, it's usually a clogged printhead. My customer had this issue, and nozzle check seemed to confirm it (lots of breaks & fractures in the 4 colors).  (All his ink tanks were 3/4 full.)

I ran a total of nine head cleanings (& subsequent nozzle checks).

After head cleaning #1, black got a little worse. After head cleaning #2, black DISAPPEARED (no blank ink at all), leaving Cyan good, Yellow good, and Red looking patchy.

Then Red faded out after cleaning #3, and Yellow faded out after #7.  (The lines broke up and fully disappeared.)

But the weirdest thing is:  BLACK went from 0% showing up in #3, to 100% saturation in #4, just one cleaning. It was like a switch was flipped.

(FYI I tried a firmware update and factory reset between #7 and #8, no improvement for Yellow & Red.)
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(1) What would make all four colors behave as if the head cleanings are depleting the ink, not restoring flow?

(2) What would make BLACK suddenly re-appear completely after one cleaning?  As if a software switch had been flipped?
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