^JT — Head Test Interval
Plain English
Sets how often the printer automatically tests its printhead for bad elements. The test runs every n labels. Set to 0 to disable.
When to use
For production lines where print quality is critical — automatically detect failing printhead dots.
Syntax
^JTn
Parameters
| Parameter | Description |
|---|---|
n | Number of labels between head tests (0 = disabled) |
Example
^XA ^JT100 ^XZ
Test printhead every 100 labels