Those are internal test paterns from diagnostic mode (available just for the techs), but you can print them from Corel or something else (CMYK separately at 50-60% coverage) or you can make copies with DADF open choosing at the color output to copy to single color.
You are right. There are 2 ROS. One is for cyan and black. This symptom starts on the cyan and then, after a period of time also goes to black. Both colors share the same laser but the window where the laser travels is different.
I was afraid that it was going to be the ROS, but getting your opinion on it helps me make a intelligent decision than just trying to throw parts at it and not knowing if I am wasting time and money. Thank you for your help.:smileyhappy:
I'm really sorry, but it is a ROS problem. You also have other problem on the black, but should be the corotron.
sorry the delay.
I dont know how much you've checked but.
*Paper -> use another ream of paper, select correct paper-type in tray settings
*Calibration -> Perform an Auto Gradation
*Change drum -> I guess you've already done this, or just try switching between cyan and another drum.
*Copy & Print -> Does it show up on both copy and print?
*Clean -> which you've already done.