Casio UP-250 Technical Manual page 71

Note:
Do not remove the screw from the print head cover.
9. Remove the print head cover.
10. Remove all the jammed paper.
Note:
Do not pull the jammed paper in the opposite direction of paper feeding.
11. Replace the print head cover and secure it with the screw.
12. Replace the ribbon cassette and close the auto cutter.
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