How to manually adjust the Print Darkess on the Zebra ZD420, ZD421, ZD620, ZD621
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1. The printer must be powered on and the label must be loaded.
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2. Press pause for 2 seconds to enter advanced mode.
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3. The staus indicator will show solid yellow, indicating mode is ”manual media calibration”.
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4. Press feed button twice until the data indicator is illuminated.
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5. The printer is now in manual ”darkness adjustment mode”.
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6. Press pause once to start the adjustment
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7. The printer will print a test pattern showing the current darkness number and several barcode patterns and then pause momentarily.
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8. When the printed label shows your desired darkness, press feed to set the darkness level.