Please check that the end of the RD roll feeds under the gap (media) sensor and it can be seen from the other side.

If the end of the RD roll has not been fed under the gap (media) sensor, the TD-4000/4100N may not be able to detect the media properly.

If not, turn the machine off and reinstall the RD roll as the illustration below.

Insert a RD roll into the roll compartment upside down with the labels feeding from the bottom as shown. Check the position of the roll guide and adjust it to prevent the RD roll from moving sideways.

Position the end of the RD roll to touch the black plastic cutter guard.

Turn the machine back on and then press the Feed button to set the roll.