I have a 5501i that occasionally, and I mean very occasionally, will shift the copied image 4 inches up the page (towards the back of the machine). It seems to occur only on copies or scans through the doc feeder. All trays are affected, and all pages in a job. I have seen it happen once, and the tray and doc feeder were registering the proper size. A month or so ago, it threw a C 9000 error (DP Comm error). I flashed the machine and didn't think much of it till now. Kyo tech support said maybe bad DIMMS, but I'm leaning towards DP main PWB. Thought I would see if anyone has an opinion on this before I start stabbing in the dark with parts orders.
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