Dell 3130CN has short blue horizontal lines on all prints

Apr 14, 2018
Hello printer experts,

As per the title, these short (2mm to 4mm) horizontal lines on my Dell 3130CN are blue (only) and regularly spaced (29mm apart vertically ) on the left and right sides on all prints.

I did Contamination and Gradation tests but unfortunately the scans are too large to upload.

Any suggestions?

Many thanks.

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