Have you cleaned the registration sensor? To explain, registration on these printers occurs by using the K channel as default and always assumed to be correct and CMY are aligned to K. Dirty sensors and third party toners can mess with this process as the density of toner is different than OEM. Dirty sensors will cause issues with OEM and third party. Sensors are inside the front door as they read swathes printed to the transfer belt to perform calibration.
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