I have a Zebra Z4M printer. We use it to print on various labels - pre-printed and blank labels (semi-gloss). I've been struggling to print on one of the pre-printed labels. Everything else prints perfectly. For some reason, when I load the labels to print on it, it does not seem to calibrate and keeps giving me an error: "ERROR CONDITION PAPER OUT". I've tried checking if the sensor perhaps moved and calibrating it, but nothing seems to work. I'm puzzled, since I can still print everything else perfectly.

Some labels are hard to calibrate, nee to calibrate the sensors with manual calibration.
1} go to the MEDIA AND RIBBON CALIBRATION,
2}take 2 or 3 labels from the base paber, load the way to the based paper stay unther the sensors, 3}close printhead.
4} press ok.
5} Move the ribbon out from sensors and close the printhead.
6) press ok
7) wen printer ask RELOAD ALL, load the labels correcly and the ribbon, close the printhead and the top door, and press ok. The printer run the calibration it self.
wen finish, saved (press setub twice) and test.