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Troubleshooting
Printer Diagnostics
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
5. Note the relative darkness value and the print speed printed on the best test label.
6. Add or subtract the relative darkness value from the darkness value specified on the
configuration label. The resulting numeric value is the best darkness value for that specific
label/ribbon combination and print speed.
7. If necessary, change the current darkness value to the darkness value on the best test label.
8. If necessary, change the current print speed to the speed value on the best test label.
Table 5 • Judging Barcode Quality
Print Quality Description
Too dark Labels that are too dark are fairly obvious. They may be
readable but not “in-spec.”
• The normal barcode bars increase in size.
• The openings in small alphanumeric characters may
appear filled in.
• Rotated barcode have bars and spaces run
together.
Slightly dark Slightly dark labels are not as obvious.
• The normal barcode will be “in-spec.”
• Small character alpha numerics will be bold and
could be slightly filled in.
• The rotated barcode spaces are small when
compared to the “in-spec” code, possibly making the
code unreadable.
“In-spec” The “in-spec” barcode can only be confirmed by a
verifier, but it should exhibit the following visible
characteristics.
• The normal barcode will have complete, even bars
and clear, distinct spaces.
• The rotated barcode will have complete, even bars
and clear, distinct spaces. Although it may not look
as good as a slightly dark barcode, the barcode will
be “in-spec.”
• In both normal and rotated styles, small
alphanumeric characters look complete.
Slightly light Slightly light labels are, in some cases, preferred to
slightly dark ones for “in-spec” barcodes.
• Both normal and rotated barcodes will be in spec,
but small alphanumeric characters may not be
complete.
Too light Labels that are too light are obvious.
• Both normal and rotated barcodes have incomplete
bars and spaces.
• Small alphanumeric characters are unreadable.
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