Printer Repair Questions? Ask IT Technicians for Answers ASAP
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Does the problem occur when copying as well as printing?
If you print a diagnostic page does any magenta or cyan print on it?
Since all new parts have been fitted, this points to a loose connection.
Have you tried removing and re-fitting the parts?
Check that it is securely fitted and connected.
If the problem persists then the drum unit is suspect.