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I posted this before back in may. I have a MP780 that has the following simptons. I have a new print head and new ink in the printer. When I perform a nozzle check the section at the top for the BCI-3 is not there at all, only the BCI-6 color sections are printed. If I place a black and white...

I am in the process of repairing an MP780, and I think I need to clean the purge unit. My problem is that I can't find any directions as to how to do it. I don't want to cause any more harm than necessary. Anybody out there know the procedure to clean the purge unit on this machine? Thanks