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Troubleshooting
Printer Diagnostics
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
4. See Figure 3 and Table 5. Inspect the test labels and determine which one has the best print
quality for your application. If you have a barcode verifier, use it to measure bars/spaces and
calculate the print contrast. If you do not have a barcode verifier, use your eyes or the system
scanner to choose the optimal darkness setting based on the labels printed in this self test.
Figure 3 • Barcode Darkness Comparison
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