CT4-LX How to deal with a printer that does not work after issuing a print instruction

<The causes frequently observed>
Offline" is displayed on the screen
<Measures >
Please switch the screen to "online".
Operation in online/offline status

Operation of online state/offline state: 

If the screen is "Online", please cancel the JOB data of the printer driver, and then cancel the data of the printer.

How to cancel printer data: