Two weeks ago I went out and looked at a 205c that was creating intermittent random black(only) bands on the rear edge of letter paper in the portrait direction. Sorry I don't have a sample as they have been sent back for warranty. On the 205c I swapped the IT belt and black dev just for testing purposes. Putting the original units back in when problem remained. The black drum unit immediately fixed the problem as I figured it would. I just called the customer and they have not seen the bands since.
I attached 2 samples from a 2550ci that I just looked at that creating the same pattern but in all 4 colors. This was a print job and would not do it for me while looked at machine. But I recognized the pattern immediately. The 2550ci has 13k BW and 9k color copies on the machine, 1st service call. The pattern can be any combination of the 4 colors. Yellow alone OR cyan and magenta OR black, cyan, mag OR yellow and mag....totally random.
Color Bands.pdfColor Bands (2).pdf
Talking with Tech Support about the 2550ci they didn't have a lot of ideas about it, but what stumped both of us is all 4 colors doing it. 4 drums going bad??? Doubtful, but if it's going to happen it will happen to the machine that is out of town. So I didn't have spares to test with. Tech support was more inclined to think IT belt issue...
All I did to the machine was apply contact grease to grounding points on drums and IT belt. Reseat memory and connectors. Asked the customer to run as normal.
Firmware was/is up to date on both machines also.
I'm curious if anyone else seeing this pattern???
Thanks
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