Replace the Ink Ribbon Cassette in Your M150MC4

To replace the ink ribbon cassette in the M150MC4:

1. Unplug the device.
2. Open the Unit.
3. Hold the ribbon cassette by its tab and pull the ribbon cassette straight out to remove it.
   

   

4. Turn the knob of the new ribbon cassette in the direction of the arrow (clockwise) to tighten the ribbon.
   

   

5. Install the ribbon cassette. Position the ribbon is between the print head and the ribbon mask. Printing will not function properly if the ribbon is placed behind the ribbon mask.
   

   

6. Push the ribbon cassette until it snaps into position.
   

   

7. Turn the knob of the ribbon cassette in the direction of the arrow to tighten the ribbon.
   

   

8. Close the Unit.