I also have a pc60. Ive only had this problem a few times. Each time there was a way to eliminate the problem.
The Simply one I do if I get any kind of banding is rotate the image 45 degrees or 90 degrees. Then try printing it again
Or Turn off the machine computer etc and leave for 30 secs then start them all again and try once more. Sometimes there?s a silly bug within the message sent. so this rids the machines of it?. Normally
If its printing black perfect it cant be the print head!
I had the problem one time and nothing I did worked. I called in a guy to have a look. All it was was the print head was loose & not aligned properly. Like I said if it?s printing black fine then it shouldn?t be the heads. But if it is then they cost about £180 but! If you keep your old print cartridges like I do every time you get to 200 spent cartridges. Send them to Roland and they send you a new print head free!
Another way is if you?re printing a vector graphic. Try converting it to a bitmap, or jpg image file. Then try printing it.
Normally Corel gets good results when printing. If there seems to be any glitches with the quality of the print. I would open the graphic in signlab or Photoshop & print from there. Again it?s just another option.
Have you had the machine printing the same kind of work before it started banding?
Has the machine been banding since you bought it?
How old is the machine as it may still under warranty.
Let me know I can speak to a couple of the guys in my work and see if they have any other solutions to this problem.
All in all I find the pc60 an excellent machine for the money.
Banding like this is also a common problem with the Gerber edge. A machine 3 times the price of a brand new Roland. I know this doesn?t stop the frustration I just thought ide mention it as the gerber edge is constantly being compared as the superior machine.