To clear the blockage, turn on the printer and open the cover to the printer carriage. If the printer tries to lift the carriage out of the park position, help with a gentle pull. As a rule, it should be possible to move the slide to the center.
Now interrupt the power supply by pulling the power plug out of the housing. Move the carriage to the position where you can remove the cartridges from the carriage. Check the cartridges for broken plastic particles. Shine a flashlight inside and look for other foreign objects. Remove these with tweezers.
Then slide the empty sled back and forth. Snap it into the park position and pull it back to the center. You can rule out a motor problem by moving the carriage back and forth without cartridges. To do this, simply plug the power plug back into the housing and leave the cover open.