Zebra ZD620 - Issue: Label Job Sent, Data Transfers, But No Print; Possible Cause - 1; Possible Cause - 2; Possible Cause - 3

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Troubleshooting
Issue: Label Job Sent, Data Transfers, But No Print
A label format was sent to the printer but was not recognized. The DATA light flashes but
no printing occurs.
Possible Cause - 1
The prefix and delimiter characters set in the printer do not match the ones in the label
format.
Resolution
Verify the ZPL programmings prefix (COMMAND CHAR) and delimiter (DELIM./CHAR)
characters. Configuration Setting to Command Cross-reference.
Possible Cause - 2
Incorrect data is being sent to the printer.
Resolution
Check the communication settings on the computer. Ensure that they match the printer
settings.
Possible Cause - 3
Incorrect data is being sent to the printer.
Resolution
Check the label format. See the ZPL Programmer’s Manual for details on printer
programming. For printer links to manuals, see the About section of this guide.