AMT Datasouth 5106 - Manual (Page 17)

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7. Confirm the original position of the thermal head again. Then tighten two
hexagon bolts to fix thermal head to bracket EA.
Note:
Over-tightening hexagon bolt may cause the screw thread to break.
8. Clean the elements of the thermal head by using a soft cloth with isopropyl
alcohol. Test print a label. If the printing result is uneven or contrast is
unacceptable, check the original fixing position of the thermal head at first and
adjust the thermal head position as necessary.
4.2 Changing the Direction of the Take-up Roller
1. Power off the printer.
2. Fully extend the take-up roller.
3. Remove the take-up roller motor cover.
4. Switch the locations of the red and white wires on the motor side of the connector.
5. Reinstall the cover.