HP9500 Horizontal Streaks

Mar 27, 2023
When start printing after switching the machine on i get these streaks on the paper in line with it's motion through the printer. With time they can disappear but there is no guarantee that they won't re-appear. The quality troubleshooter doesn't show this issue.
I've cleaned all the parts that are user cleanable without success along with replacing some parts for which i have spares. I've run the print from tray 1 to the side outlet to minimise the route.
The length of the streak is consistent with a 25mm roller if it is roller causing the problem.

Print Marks.jpg
Print Marks2.jpg

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