marks on media vj1614 ?

[yonu]

i'm hoping someone can help me out. These marks come up randomly I printed about 20ft this morning with no issues, then all of a sudden, they were in the middle of a 10ft run please ignore the swab I was checking to see if it had come from the pinch rollers, but they were clean

 

[Ssignature]

That’s a head strike Either from the media tracking off to one side or tunneling up from temps too high.

 

[yonu]

ok what is the easiest way to diagnose the cause? I use the recommended temps from the media manufacturer. Could it be the head itself? The reason I ask is I watched the carriage the other day slide the right-hand media guide back when the carriage went to far right while printing

 

[unmateria]

Yep, thats a head strike. Usually bad vacuum settings, too much hea (try with 0 or 30C), bad setup on the automatic enroll, bad media alignment or bad media bar bearings.