SATO FX3-LX Operator's Manual page 445

Error Message 1007 (Cover Open)
When there is an error with the printer, the error message appears on the screen.
Check the cause and countermeasure, and then take appropriate action.
To clear the error:
Close the top cover.
Cause and Countermeasure
Cause (1)
The top cover is open.
Countermeasure (1)
Close the top cover so that it clicks when locked.
Cause (2)
The sensor for detecting the open/close status of the top cover is defective.
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