I had the impression the sensor was sealed. I tried, although admittedly not very hard, to pop the lens off the thing and it seemed glued. That one is in the garbage, but the next time I see it, I'll try that. Though truth be told, we have 3 more of these in our current inventory to get rid of, so I just may do that instead, so as to appease them bean counters always harping on our inventory levels.
I find that kind of odd that this would manifest itself on the paper based on the stock. Correct me if I am wrong, but aren't the dots of toner for any particular colour blend overlaid one over the other YMCK in that order onto the belt and then off the belt onto the paper in reverse order, and this is independant of paper type or weight? If I saw colour registration issues without codes, I would question the drum/developer as being a possible first (out of round drum, bent shaft, worn CS bushings), with maybe the first transfer roller for the specific colour, magenta in your case, as a possible second area of concern. I'll admit that you are likely right, strange things go on in these machines sometimes.
And if I recall, there is a fine adjustment for each colour.
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