Forum Moderators: open
It sounds like the control board is on it's way out. There are several test to find out where the problem is.
1. Does it self-test ok? (test print without the computer)
2. Does the problem still remain if you change the cable?
3. Is the problem there after a reinstall?
4. Does the problem occur if you setup the printer on another computer?
I'm going up to the workshop in a minute. I'll get the manual and have a chat with the guys.
Chris