SATO CT4-LX Operator's Manual page 474

Cause and Countermeasure
Countermeasure (2)
Tap [CUTTER ACTION] to move the cutter
blade back to the specified position.
If the error is not solved, power on the product
again.
Contact your SATO technical support if the error cannot be resolved.
Contact Information for When You Are in Trouble
Reference
474