Everyone thinks there is a sensor. There is not. The printer lays down toner on the belt during calibration and reads the image and makes adjustments based on the reading of the pattern for each color. If the reading portion had issues then all colors would be off. Could be one of the toner slots has worn where the toner does not sit in the correct position. You do not tell us if the toners are all oem or aftermarket of a mixture.
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