SATO CL4NX Operator's Manual page 723

Error Message 1020 (Calendar Error)
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:
Change the calendar settings, press the
printer.
Cause and Countermeasure
Cause
The date and time of the calendar are incorrect.
Countermeasure
Power on the printer again, and check the print data.
Powering On/Off the Printer
If the error persists, you should check if you have installed the RTC kit or replace the RTC PCB.
Contact your SATO technical support center.
Contact Information for When You Are in Trouble
button (OFFLINE) or
723
button, or power off the