Roland sp 540 misprinting various size horizontal bands. sometimes the wrong color and sometimes its just printing little black lines

This is a Professional quality printer. Contact Roland Support direct.

https://www.rolanddga.com/support/products/print-printcut/soljet-pro-iii-xj-540-54-eco-solvent-inkjet-printer

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Question edited for clarity, full 'maker model (what it is)'.
Question moved to the only Roland Printer category.

Try a Head Soak. Make sure the tube to the waste ink bottle is not blocked or pinched.

https://www.google.com/search?q=versacamm+vp540%2C+coverig+image+in+black+ink

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Question edited for FULL 'make model (what it is)'.
Question moved from Computers to correct category.
"DATA ERROR CANCELING..." Output was stopped because a problem was found in the data received.
Operation cannot be continued. Check whether or not there is an error in the data. Check for a problem with the connector cable or the computer, and redo the operation from setting up the object to be printed on.Roland Technical Support.

VersaCAMM VP-540 54" Eco-Solvent Inkjet Printer/Cutter

https://www.rolanddga.com > products > print-printcut
VersaCAMM VP-540 54" Eco-Solvent Inkjet Printer/Cutter technical support page such as support articles, support guides, software updates, firmware, ...

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Could you try
(1) Temporarily stick a white strip over the sensor where it detects the media or
(2) On the length of the media or
(3) Even staple same sized white media below the black one which you can un-staple after printing.
kindly ignore if these are (s) tupid answers

try to change the color ink. horizontal banding (the pink or other color lines appearing means horizontal banding) when there is a problem on one of the heating element of the printer head. since almost all canon printers have head built in the inks, replacing the faulty ink will solve the problem. if not then the controller of printhead on the carriage and mainboard needs to be checked.

Probably the head.. sounds like magenta not firing Inkypete

Check for scratches on the drum surface. If you have ran a lot of copies on there, its a good time to get it serviced. It could be the cleaning blade on the drum as well.

directly hooking the printer to mac and windows computer are you getting bandings still? interesting issue... we will isolate it first by trying to hook printer directly to both computer, if its printing fine when directly connected, then there is something on the application or communication process. try printing a different document using same application when on the network and try printing from different application as well. update me afterwards..

Is the band are white or black ????

If white, you might have a bad cartridge : replace it.

If black, you will need to clean your printhead and sometime under the carriage there's accumulation of ink....

Try changing ink cartridge. Print only "grayscale" and if that happens, you need a black cartridge changed. If, not color

If you need further help, I’m available over the phone at https://www.6ya.com/expert/alex_22751bbefa74c3d0