Intermec EASYCODER 7421 - Manual (Page 29)

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6. Center the labels in the printer path and adjust the label
guides so that they just touch the edges of the label liner.
Wind the yellow adjustment roller toward the rear of the
printer.
7421U.015
7. Lower the printhead assembly and lock it into the operating
position by pressing down firmly on both sides of the
printhead. Lower the printer cover.