MG5650 replacement head - blocked or broken?

jimbo34

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Printer Model
MG5650
I'm trying to repair an old MG5650 going and purchased a replacement head online from China to use with refilled cartridges. Its arrived, installed and prints more or less ok. The only problem is on the BK black there is one single line missing/blocked which shows very faintly as lines on photos. I contacted the seller who told me to keep cleaning. I've done this many times but the line remains. Is it a blockage or has the head arrived damaged? I attached the print head check pattern.
 

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