Problem with my Epson Pro 9800 ! Advise needed !

Benbutter

Member
Hi,

My Epson Pro 9800 has been giving us problems recently. The entire proof were printed out together with a series of shadow prints and it occurs only when we are printing dark colours, it cant be seen when printing light or bright colours.

Any help is very much appreciated. :confused:

Thanks!

Ben
 

Cliff

Well-known member
Probably off here but are you talking about Black or dark heads being out of alignment in the horizontal , bi dir ok ? step? is it off by much ? horizontal and or vertical ? material slipping ?
 

Benbutter

Member
hi

hi

Hi Cliff,

Thanks for replying.. its is a very consistent shadow like black vertical lines .. its very obvious especially with purple background...

Regards,
Ben
 

Colorblind

Well-known member
I've seen my Epson 9800 behave that way on some prints when printing bi-directional 720 dpi. I could see large vertical shadowy bands, especially in dark areas. Switching to uni-directional 720 dpi doubles (or so) the printing time but fixed the problem.
 

Cliff

Well-known member
The above solution is worth a try,.. what happens during the internal test patterns, what about factory images ?

Veticle lines, where on the sides or top and bottom.

sides = bi dir
top bottom = step or bottom only =slip.
 

Benbutter

Member
hi

hi

Hi Colourblind, do u mind to elaborate? do you mean changing the direction of the printing brush?

Pls advise .

Thank you & Regards
 

Colorblind

Well-known member
Hi Colourblind, do u mind to elaborate? do you mean changing the direction of the printing brush?

Pls advise .

Thank you & Regards
At some printing resolution (such as 720 dpi x 720 dpi), your Epson 9800 can print Unidirectional or Bidirectional:

Unidirectional: prints while your head moves from right to left then printhead comes back to the right before printing another row. Slow but gives best quality IMO

Bidirectional: prints while your head moves from right to left then also prints another row while printhead returns to the right. About twice as fast as unidirectional but (I found) can sometimes create strange patterns/artefacts as I experienced before.

You should be able to choose between the 2 in your rip settings.
 

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