Problem with the Carriage PCA
Try the following:
1. Switch the power off from the back of the printer and disconnect the power cord. Reconnect the power cord and power on the printer.
2. Check that the Trailing Cable is not damaged. Check that the Trailing Cable is correctly connected between the Main PCA and Carriage PCA.
3. Replace the Carriage PCA.
4. Replace the Trailing Cable and Carriage PCA Covers.
5. Replace the Main PCA.