printing problems with sp-540v

[liquid designz]

printer just started printing black vertical lines on my prints. seem to not show up in same spot every time.
and also seems to be when printing bi-directional(when it prints back to base) any help would be appreciated.

https://drive.google.com/file/d/1MPG7OhWCjnPIB10i8qYxds_q53gdWtKE/view?usp=sharing

 

[bil]

Hello,

Check your black head cables, and if it's possible change them.

 

[Jim Hancock]

Please post a nozzle test print also...