SATO CL4NX Operator's Manual page 240

Automatically check if there is a broken element of the print head.
The options are as follows:
Off
Disable the Head Check.
All
Check the entire print area.
Barcode
Check only the area for printing a barcode. Head check is not applicable for barcodes printed as
graphic data.
• Head check is a reference for checking for a broken element of the print head. This
function does not guarantee barcode readability. A regular barcode reader test is
required. When a void of printing got up, the head check function may not work
immediately. Some gaps may occur.
For the outputted label after the head error, perform the scanner reader of the printed
barcode to check the label.
[Head Check Mode]
Set the method for head check.
Appears only if you have selected [All] or [Barcode] in the [Head Check] menu.
The options are as follows:
Always
Perform the head check for every item.
After Batch
The head check occurs before starting to print and when printing is stopped. If backfeed is
applicable, the head check occurs before starting to print, when stopping to print and during the
backfeed.
Every Page
Perform the head check for each specified number of media.
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[Advanced]