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Troubleshooting
Operator Darkness Control
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
Operator Darkness Control
The Operator Darkness Control switch allows the operator to modify the darkness setting for
minor variations in media and printers avoiding the need to change the program or driver settings
sent to the printer.
The control switch has three (3) settings:
• Left: no effect (Low - Default)
• Middle: increases darkness 3 levels (Medium)
• Right: increases darkness 6 levels (High).
The Low (default) setting makes no change to the actual Darkness setting as set by
programming or driver setting. The Medium setting increases the Darkness level by 3, i.e. if the
printer is set to the default darkness level of 20, then the actual darkness applied while printing
will be 23. The High setting will add six (6) darkness levels to the set darkness level.
Important • Setting the Darkness too high or too low may reduce barcode readability.
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