Zebra A300 Specifications Page 85

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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.
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.
The ^JT (Head Test Interval) instruction lets you change the print-
head test interval from 100 to any desired interval. The printer auto-
matically performs an internal printhead element test which occurs
every 100 labels. This takes place during formatting which minimizes
a delay in printing. Therefore, the test may be performed while the
printer is in PAUSE.
Calibration and Media Feed Instructions
The following instructions, presented in alphabetical order, are used to
perform various media and ribbon calibrations and also set the media
feed mode for the printer.
The ~JC (Set Media Sensor Calibration) is used to force a label length
measurement and recalibrate the media and ribbon sensors.
NOTE: In continuous mode, only the media and ribbon sensors will
be recalibrated.
The ~JG (Graphing Sensor Calibration) is used to force a label length
measurement, recalibrate the media and ribbon sensors and print a
graph (media sensor profile) of the sensor values.
The ~JL (Set Label Length) is used to set the label length. Depending
on size of label, printer will feed one or more blank labels.
The ^MF (Media Feed) instruction dictates what happens to the
media at “power up.”
76 CHAPTER 5
ZPL II Advanced Techniques
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