I need everyone's help. Recently, my HP T7200 printer has had this problem. During the boot - up initialization, the printhead suddenly stops on the left side of the maintenance cartridge compartment while moving. The error code 86:11 appears on the screen, indicating a paper jam error. However, there's actually no paper jam in the printer. At this point, the screen prompts me to press the "OK" button if there's no paper jam. After I press it, the printer restarts and checks for errors, and finally shows a "scanning axis error". But I don't think there's an issue with the scanning axis because the printhead moves smoothly from left to right. Also, there are no obvious stains or damages on the encoding strip. What could be the problem? And how can I continue the inspection? Thank you all for your attention.