• 1-13 • Introduction •P1057798-001 rev. B
QLn420 Series Unit Test & Calibration
Equipment Required
1. A computer with the following minimum configuration:
• Pentium CPU
• 256 MB RAM
• 1 GB Hard Drive
• CD-ROM drive
• SVGA 14 in. monitor and SVGA card
• 2 Serial Ports
• USB Port
• Windows XP
• Unit Test Software version 3.3 or higher installed with the “euro”
configuration.
2. A bar code scanner, using either RS232 (serial) keyboard “wedge” or USB
communications. (Example: Symbol Model LS1908 series)
3. USB Interface Cable part number AT17010-1 or a Zebra approved equivalent.
4. Spare batteries, chargers and test media specific to the printer. Refer to the table
in the “Tools and Supplies” topic in Section 2 of this manual.
Running The Software
CAUTION: DO NOT disconnect the communications cable at any time during the Unit Test
procedure unless prompted to do so by the software!
IMPORTANT: Certain replacement procedures in this manual will require running the test
procedure to verify a repair. It is recommended that you perform the entire unit test sequence
for these procedures to ensure all printer functions are functional after the replacement.
To Start
• Launch the Unit Test Application.
• Plug the Serial Interface Cable into the printer’s communication port.
• Follow the on-screen instructions.
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