C3290 we have had for several years, great unit. Last year I replaced the toner cartridges as I have done many times before, bought 2 toners off an online reseller, genuine catridges
The new Cyan toner installed displayed a repeating pattern 28mm in spacing long and about 25mm spacing across, so every 28mm along the length of the page there is a set of 8 equally spaced small wavy Cyan lines each about 10mm wide x 2mm high. On doing a bit of research it appears that this is a roller aprox 8.9mm in diameter and I had to guess inside the cartridge itself a defect exists.
I persevered with this for quite a while until it got the better of me and I relented and put the second new toner cartridge in figuring that I would just throw the faulty Cyan one away.
but on install the second new cartridge displayed almost identical behaviour, same spacing and defect and only the Cyan.
I find it hard to beleive that i have got 2 faulty catridges with an almost identical problem but that is what it seems like as there is nothing else that creates that repeating pattern spacing
Have half printed a page to eliminate the fuser and it seems that it cant be that
Anyone have any other ideas, I have ordered another cartridge to try and hopefully fix the problem but if that fails I really will need an explanation other than the cartridges.