Paxar MO 9742 - Manual (Page 7)

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MO9740 Manual
7. Turn back the print head module and then insert the empty core
into the pick-up holder. (First snap in the left side, then the right
side.)
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MO9740 Manual
8. Turn the wheel of the print head module to ensure the ribbon is
tightly wound.
9. Press down the print head module on both sides firmly until you
hear a positive click from both sides.
Wheel
Print Head Module