Head Test Fatal
The ~JN (Head Test Fatal) instruction resets the printhead element
error override, acting as a toggle for ~JO. Printer then goes into fault
status (i.e., turns head indicator on steadily) if any subsequent execu-
tion of the printing element test detects bad printing elements.
Head Test Non-Fatal
The ~JO (Head Test Non-Fatal) instruction overrides a failure of head
element status check and allows printing to continue. The override is
canceled when the printer is turned off or receives a ~JR or ~JN
instruction. The printhead test will not produce an error if the ~JO
override is active.
264 ZPL II COMMAND REFERENCE
~JN
~JO
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