hp z 3100 problem

[dseelig]

I ma getting uneven lines about 1/4 inch but varying where my printer is simply not laying down ink . This happens randomly on the print a few inches long. On a vertical print it is a vertical 1/4 by any where from inch to three inches and on the same shot it varies where it will happen. Any ideas? Thanks David

[Mark Lindquist]

Try head cleaning.  Could be a print head going out...  but, at first look, it sounds like a clog - not sure.... try several cleanings.