Checks / troubleshooting:
5. Move Carriage from side to side while the
printer is turned off and see if there is
anywhere Carriage does not move smoothly.
6. Confirm the reproducibility of the error.
8. Confirm the connection of the CR motor.
9. Confirm the connection of the CR FFC.
10. Confirm whether tension of the steel belt is
proper.

Recommended actions:
Clean and lubricate CR rail roller guide.