Quickmaster QM 2 Problem driving us mad

Ok ill try describe the problem. When we print A3 black with a large amount of black block about an inch thick we get after about 600 sheets lines going across the page. These lines are about 5mm apart and match the cogs on we think the blanket. We have swapped plates. Had plates made elsewhere tried new fount, everything. Its mental we cant sort it at all. Had an engineer out all pressures are ok

 

make sure ink is not too loose try medium tac

 

Sorry, what do you mean loose and med tac? I have a pic but dont know how to upload it

 

Need to see the lines..but it
sounds like a form roller is going south...my guess . the one that swings down/.the one up above the wash up unit...thinking blue one ...

 

Starts off on the back edge and moves right across. Think its called bar marking. I have a pic but dont know how to put it on here?

 

does it show up if you start off running the press slower??wil it happen on thick stock? or just envelopes?

 

go to advance reply and click the paper clip

 

See attached its only only jobs with large coverage

 

..Looks like a roller issue to me??? pull out the blanket wash device and pull out the 3rd form roller ( un-screw the allen bolt and drop the roller down..can be a pita if your press is filthy!! .. Try running a problem job and see if mark goes away

 

Thanks we will give this a go next few days

 

I agree looks like ink build up on bar take out rollers and clean

 

Looks like a roller setting issue. Re stripe ALL rollers, be sure PH is correct , good blanket .. That is not much coverage, when it starts clean and goes bad.. roller issues