SATO CT400 Operator And Technical Reference Manual page 25

Section 2. Installation and Configuration
7. Close and latch Print Head Assembly.
8. After loading the ribbon and media, it is recommended that you run a Test
Print to make sure the labels and ribbon (for CX4XXTT only) are correctly
loaded. See Section 2 for instructions on how to run test prints.
SATO CT Series Printers
Route Paper under the Sensor
9001069A Page 2-9