PIXMA MX922 unusual PGBK alignment pattern

[Doc_Ondrusek]

My MX922 suddenly started printing blurry black text. The alignment pattern shows a very unusual horizontal divergence pattern, almost as if it is an intentional pattern:

Has anyone ever seen this pattern? Note how the first divergence (3rd row) forms a perfect inverted "V" - the double lines are perfectly vertical until the 3rd last row where the converge again in a perfect "V" shape.

This seems too "perfect" to be a faulty head; I'm suspecting a software or firmware issue. Anyone else ever see (and hopefully resolve) this?

Everything else about the print, including the other colors, all work fine.

Thanks in advance. Doc.

[Doc_Ondrusek]

Clearly, there is no solution to the PGBK problem. My suspicion is that it is a built in obsolescence fault in the firmware. An intentional fail to get you to spend for service or a replacement printer. So I scrapped it and bought a new HP smart tank. It's excellent, and a bottle of ink to refill the tanks costs less than a cartridge that holds a tiny fraction of the ink.

[Junior72]

Thanks so much for the reply!