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:
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.
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.