Need Help Magenta line after dark colors print

[Jaime IL]

My Mutoh Valuejet has recently been printing a small 1/8 inch magenta line after dark colors. We have recently changed our printhead, maintenance station, wiper and we do weekly cleanings. I have tried adjusting my ICC profiles (using FlexiSIGN-pro) and output color levels. The line is only printed at the top every time a dark color is printed and not on any other side. Attached are some pictures for a better description. Any suggestions/advice is greatly appreciated!!!

 

[flyplainsdrifta]

does it happen on single color black?

 

[Jaime IL]

Yes, on top of the single black line

 

[flyplainsdrifta]

sorry should have been more clear. in the file make up, is it a composite black (30,30,30,100) or single color (0,0,0,100)?

 

[Jaime IL]

30/30/30100

 

[flyplainsdrifta]

reason i ask is on all of my printers that have that magenta peeking with black, it usually comes down to a ph alignment issue. not sure how the valuejet is set up or anything, but id run the alignment pattern (if there is one) and see where you are at.

edit: try a single color black and see if the issue repeats itself on those.

 

[MikePro]

you've got cyan showing as well, in that yellow "M" logo. chances are, your printhead alignments are off.

nozzle/alignment test prints should confirm

 

[henryp]

My Mutoh Valuejet has recently been printing a small 1/8 inch magenta line after dark colors. We have recently changed our printhead, maintenance station, wiper and we do weekly cleanings. I have tried adjusting my ICC profiles (using FlexiSIGN-pro) and output color levels. The line is only printed at the top every time a dark color is printed and not on any other side. Attached are some pictures for a better description. Any suggestions/advice is greatly appreciated!!!

The printhead slant adjustment is most likely out, the printhead needs to be rotated so that all colors line up to the reference color.

 

[Jaime IL]

I spent all morning doing all the proper alignments and now all the checks come back and aligned perfectly, but there is still the red line

 

[signman315]

could be sabre angle as HenryP described, but I don't think that would result in the prints as you showed them....really looks like a head alignment issue of one kind or another....is it along the X or Y axis that the magenta/shows? You can also see the cyan on the opposite side, what you are showing in the pics is tell tale printhead alignment issues. The X axis can be fixed with a digital calibration....the Y axis needs to be aligned mechanically by adjusting the physical position of the head (not a fun time). This is based on my experience with other machines, so Mutoh might be a little different (i.e. I might have my "X" and "Y"s mixed up) but it definitely appears to be some kind of printhead alignment issue. Have any repairs been performed recently such as a head replacement?

 

[Jaime IL]

could be sabre angle as HenryP described, but I don't think that would result in the prints as you showed them....really looks like a head alignment issue of one kind or another....is it along the X or Y axis that the magenta/shows? You can also see the cyan on the opposite side, what you are showing in the pics is tell tale printhead alignment issues. The X axis can be fixed with a digital calibration....the Y axis needs to be aligned mechanically by adjusting the physical position of the head (not a fun time). This is based on my experience with other machines, so Mutoh might be a little different (i.e. I might have my "X" and "Y"s mixed up) but it definitely appears to be some kind of printhead alignment issue. Have any repairs been performed recently such as a head replacement?

Yes we just replaced the printhead about a month ago.

 

[signman315]

Yes we just replaced the printhead about a month ago.

That's more evidence towards a printhead alignment issue....there should be some kind of "set screw" or pin that the head sits against....that pin determines the alignment of the head on the Y axis. It's different on each printer but the point is that there is some kind of physical mechanism that the printhead sits against for alignment purposes on the Y axis. If before the old printhead was removed the location of the pin/mechanism wasn't locked in place (or not noted) then when you put in the new printhead there's no way of placing it in the proper Y axis alignment. So that's my guess of what happened....but unless you let me/us know what direction the misalignment is (can't tell from pictures) then we can't determine whether it's misaligned on the Y or the X axis. Based on the fact that you recently replaced a head I'm GUESSING that it's a Y axis issue and the head needs to be loosened and physically adjusted. But if it's the X axis then it's easier and can be adjusted via the control panel of the printer (using standard printhead alignment procedure for that machine).

 

[Jaime IL]

I got it!!!! After spending all day yesterday doing manual and digital adjustments, I physically adjusted the printhead by unscrewing it and checking alignment after placement. Thank you all for your help and advice!

 

[signman315]

I got it!!!! After spending all day yesterday doing manual and digital adjustments, I physically adjusted the printhead by unscrewing it and checking alignment after placement. Thank you all for your help and advice!

Glad to hear you got it! I was thinking that had to be the case