User's Manual

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Troubleshooting
Printer Diagnostics
5/12/08 ZM™ Series/RZ™ Series User Guide 79695L-002 Rev. A
4. See Figure 21 and Table 21. Inspect the test labels and determine which one has the best
print quality for your application. If you have a bar code verifier, use it to measure
bars/spaces and calculate the print contrast. If you do not have a bar code verifier, use your
eyes or the system scanner to choose the optimal darkness setting based on the labels
printed in this self test.
Figure 21 • Bar Code Darkness Comparison
Troubleshooting
Printer Diagnostics
128
79695L-002 Rev. A ZM™ Series/RZ™ Series User Guide 5/12/08
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 darkness value to the darkness value on the best test label. See
Adjust Print Darkness/Density on page 70.
8. If necessary, change the print speed to the same speed as on the best test label. See Adjust
Print Speed on page 71.
Table 21 • Judging Bar Code Quality
Print Quality Description
Too dark Labels that are too dark are fairly obvious. They may be
readable but not “in-spec.”
• The normal bar code bars increase in size.
• The openings in small alphanumeric characters may fill in
with ink.
• Rotated bar code bars and spaces run together.
Slightly dark Slightly dark labels are not as obvious.
• The normal bar code will be “in-spec.”
• Small character alpha numerics will be bold and could be
slightly filled in.
• The rotated bar code spaces are small when compared to
the “in-spec” code, possibly making the code unreadable.
“In-spec” The “in-spec” bar code can only be confirmed by a verifier,
but it should exhibit some visible characteristics.
• The normal bar code will have complete, even bars and
clear, distinct spaces.
• The rotated bar code will have complete, even bars and
clear, distinct spaces. Although it may not look as good as
a slightly dark bar code, the bar code 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” bar codes.
• Both normal and rotated bar codes 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 bar codes have incomplete bars
and spaces.
• Small alphanumeric characters are unreadable.