The Feeder Profile test can help identify issues with the Thread Feed. The below information describes what the test results mean, and Melco Technical Support can help confirm.
Go to Tools > Maintenance > Steppers > Feeder Profile. Find the difference between the Tooth Min-Max, and Gap Min-Max. In the below example the tooth difference is 5, and the gap difference is 19. Differences greater than 5 are likely due to Thread Feed Gear damage or Thread Feed Assembly Gear Gap Adjustment.
Image above shows a gap that is Too Wide.
Image above shows the Correct gap.