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Zm400 is printing white lines through all the labels

Replaced the ribbon and now it is printing white lines through the barcodes. I believe it's a ribbon error but I don't know how to fix it. Seems like the ribbon doesn't have enough tension and it's causing it to wrinkle? It was working perfectly fine before.

Posted by Lexy Kish on


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First of all, the white lines on all the labels - are they always in the same place? Over multiple labels? If so, then it could be a printhead issue, where the printhead could have some damaged heating elements.

If not, and the white lines on the label are positioned differently, then it could be a ribbon issue.

When you look at the ribbon, while the labels are coming out, do you see a crease or the ribbon being folded over in a certain section?

If that's the case, then you need to remove the ribbon roll and put it back in place, and make sure to thread the ribbon without adding any creases.

To check if its a printhead issue, then lift the printhead up and take a look at where the heating elements are. A bad printhead could have some white patches or some black patches along the thin line where the printheads contacts the ribbon and the paper. Try to clean the printhead with a lint free cloth and try a print again. If that doesn't help, or the lines are in the same spot on multiple identical labels, even after cleaning, then you will need to replace the printhead.

Take a look at our blog post where we show what bad printhead labels would look like.

Posted on Jun 24, 2022


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Try removing the ribbon cassette and pre-tension it. There is help in the link.


Posted on May 31, 2022


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The barcode on the label is not clear

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Check the hed first..
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