L25500 Vertical Banding lately?

Not having any issues here.

Only time I have problems is when I am testing new substrates, especially items that I think won't handle the heat well and the passes run together since the heat was too low.

 

Try cleaning all the platen vac holes.....use a small drillbit. Blow em out with air. Also the platen vac fan blades get gummed up with overspray affecting vac across he platen and need to be cleaned. Another thing HP never anticipated.

 

Okay, dumb question here, which way is vertical banding?
I ask because we've had banding problems off and on since day one. But we started with bad heads and didn't know it. Recently, more banding problems just before a head failure last Thursday. Replaced the head Friday and it is working again with no banding.

Does vertical go left and right across the material as it comes out of machine? Or is it top to bottom? Our banding problem was happening from left to right as you are facing machine.

 

I would say that vertical banding is top to bottom vs. horizontal banding which would be left to right coming out of printer...

 

Thanks Tim! I mean thanks, Skinny!!!

 

Started seeing it on thin cast vinyls printing light solid colors (i.e. a flood of cyan). Going to be cleaning out the platen holes tonight as Type suggested.

 

Usually this vertical banding noticeable in light solid colors is caused by too much vacuum.

 

signswi, let us know how that goes. I'll be following your procedure when I need to!!! Right now my machine is running beautifully. Fingers crossed!