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The integral print head on the PB cart has probably failed electronically. I would not expect them to last long, as they don't have a great heat sink to dissipate the generated heating during operation (Canon print heads operate by flash boiling the ink to "spit" it out the nozzle). The black...

Happy new year, and welcome!

The photos of your nozzle plate can nowhere near determine any positive issue. This nozzle plate "chip" is one of the most complicated in the industry. ONE single blown conduction path can cause what you are seeing (which appears to be from bi-directional printing). Instantaneous currents...

Best wishes from Laramie, Wyoming (currently -3 degrees F).

About home printing... https://www.dealnews.com/features/Are-Printers-Still-Necessary-in-2019/2208539.html BTW, Happy New Year!!!

Yes, you might have stubborn deposits/precipitate in the fine print head yellow ink passageways.

You gotta wonder... IF, the reservoir is "air tight", how does the air above the ink level in that reservoir get in there as the ink level drops?? The ONLY way is through the vertical slots and ink connection passage between the sponge compartment and the reservoir compartment. Perhaps your...

Lenticular clouds over the Laramie Valley (it DOES get quite windy here...).

Yum!

+1...what Stratman said. I would use Origional Windex rather than dish soap, but given enough time both should work to dissolve a stubborn clog in dye inks. Pigment ink clogs can be VERY hard to deal with...

That implies that the purge unit is not leaking (which is good). I cannot explain the empty carts.

Those carts should not have emptied (if you story is correct). They may have drained out while installed. When you flooded the ceramic pads, did they hold a pool of liquid (they should have), or did the fluid seem to drain away?

Has anyone with either of of these printers reached the point of full waste ink pads/diapers?

Some words for those giving thanks this week...

Due to the "variablity" of the nozzle test prints, I would say either your head(s) are clogged, or you purge unit (tubing and a peristaltic vacuum pump below the purge pads) is non-performing The purge pads are the porous ceramic pads where the print head "parks" when not printing. You can see...

Great that you posted a nozzle test print! DON'T PRINT ANYTHING OTHER THAT NOZZLE TEST PRINTS UNTIL THE PROBLEM IS RESOLVED! What printer is it (we recognize it's a Canon)? What ink are used (supplier)? Where did you obtain the "refurbished" print head?? Any significant nozzle test print...

I can't get Five Star brand hot dogs out here (the Slovenian Sausage and Irish Bangers are to die for)! https://www.fivestarbrandmeats.com/ AND... advice, NEVER go to the West Side Market when hungry! http://westsidemarket.org/

A headless printer is a cost effective repair for full waste ink pads!

A recent infrared from a hike in the hills east of Laramie...

A nozzle plate stamp test in order. If yellow is present, you probably have an electronic issue. If you beleive the yellow channel is obstructed, you can also try this method, although there is some risk of nozzle plate damage if too much force is used, and it WILL be messy. Get a cheap...