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Unexpected line breaks—text wrapping, barcode truncation, or layout shifts—rarely indicate hardware failure. The root cause is usually corrupted command syntax, unintended characters in transmitted data, or damaged template formatting. Correcting the command structure often restores stable output.

Step 1: Inspect Line-Break Commands Inside the Template

Incorrect template configuration is a common cause:

Look for extra CR/LF characters

Remove unintended hidden line breaks

Check if “auto wrap” is enabled on text fields

Ensure text box width matches real content length

If barcodes break into two lines, review width constraints and code length.

Step 2: Verify Data Format Sent From the Host System

Hidden characters from MES/WMS or software can trigger forced wrapping:

Remove \n, \r, TAB or other control codes

Ensure API/JSON/Socket data contains no escaped characters

Prevent field length from exceeding template limits

Avoid automatic formatting applied by middleware

In many cases, upstream hidden characters are the main cause of line breaks.

Step 3: Check the Printer Command Language for Corruption

TSPL, ZPL, and DPL formats can misbehave if partially overwritten:

Use a diagnostic tool to inspect actual commands sent

Clear cached commands and resend a clean template

Regenerate the format if it has been overwritten multiple times

Ensure variables contain only valid character sets

This step resolves most line-break issues caused by command inconsistencies.

Most line-break issues arise from mismatched templates, hidden characters, or corrupted commands. By following the three steps above, the problem can usually be resolved quickly. If the cause remains unclear, contacting the manufacturer’s support team is recommended. Hangzhou Beajet Digital Technology Co., Ltd. provides professional troubleshooting and on-site technical support for print-and-apply labeling systems.