Since the carriage was changed I am assuming the cutter holder is probably out of wack. I know there isn't a cutter on that machine it's just what they call the piece that holds the solenoid that unlocks the carriage and the media sensor. It's a separate piece that attached to the left side when you reassembled it. There is an official method to set the height of that piece and it requires a special jig unfortunately. That being said, I have replaced them without the jig with success. There is a black piece of plastic on the left side of the cutter holder. The distance from the bottom of that and the platen should be 5.2mm +/- .2mm. I would just use a number 5 Allen key to get it set. Tighten the screws and see if that helps at all.
