The black channel is the culprit here. It has been clogging for years.
It will clear after one or two head cleanings. This is always the case. I’ve been using inkjetmall inks for maybe a decade and other than the black channel problem, all is mostly well (mostly well being that when starting printer up, it often just powers off again).
I have performed a disassembly of the printer and cleaned per instructions I had found somewhere on the web, maybe here, but didn’t actually fully disassemble the printheads. I used piezo flush and replaced the maint. cart. I ran the printhead assembly loaded with piezo flush over the printheads by sliding the assembly back and forth over the prescribed paper towels. It did not solve my black ink problem. Of course the frustrating part is every time I need my printer. I have to perform a cleaning to clear black channel. Ink goes fast doing this.
What do I need to clean or replace to get my printer healthy again?
Thanks for your help.