Strange banding, Roland SP300

[levasc]

Hi,
I always thought that the banding is due to cloged nozzles of magenta
Here the head printest for cyan is ok:

But I noticed that banding seems to be caused by the cyan printing beyond image here:

You see, the ink drops printed beyond the image, the pattern is repeated all the way. And at the same "lines" on the image the blue is lighter than other places, since part of ink used beyond the image.
What could be the cause of this banding? Head seems ok for cyan.

 

[levasc]

From photo it seems ~4 protrusions every 1 inch. As I understand the DX4 head (probably) printing width (height) is 1 inch. The draft printing (used draft) is 8 passes (bidirectional). So every 4 passes go in one direction... maybe it can be related to mechanics (or it is electronics)?

 

[davyde]

Overspray. Check the bidirection adjustment. If ok, possible static issue with media, if static not an issue, head is worn. get a new head for a perfect firing pattern.

But id replace other heads before the cyan going by the nozzle pattern.

Do tou know what the shot count is for the cyan head?


Sent from my iPhone using Tapatalk