Initial problem: C410a gradually stopped printing black. Tried all suggestions i.e. replace cartridge, clean/soak printhead and etc. Ordered new printhead. Problem solved..temporarily. After 50+ pages started seeing horizontal streaks in text and eventually no black printing, not even faintly. Cleaned printhead and back contacts. Did the "clean printhead, quality report and alignment" routines several times. Colors are normal but black completely missing.
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