I have a G7020, and I'm actually pretty happy with it. Normally, I print documents that are only a couple of pages long. However, I just had to print a 50 page document and came across this problem. It started fine with black and all colors. Then...
nope...I did 2x regular cleans and then 2x deep cleans, and it goes right back to it...still not printing the black past 3 lines. It was interesting that I got a 5200 error after the second regular clean, though...