Rice Lake Datamax M-Class - Manual (Page 19)

M-Class 11
5. Close the Printhead Assembly and press down until it locks into place.
6. Close the cover and press the
FEED button several times to position the media and ensure proper tracking.
If the printer does not correctly sense the top of each label, as denoted by the ERROR light, it may be necessary to:
Printers without front display: Perform the Auto Media Sensor Calibration, see section 4.7.1.
Printers with front display: Press and hold the FEED button until at least one label gap or mark is advanced then
release. For additional calibration procedures, see section 5.4
Note: The printer is factory set to use 4-inch media (and ribbon, if thermal transfer equipped). When using a different width of
media/ribbon, please refer to section 6.2.