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Troubleshooting
Printer Diagnostics
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
Communication Diagnostics Test
The communication diagnostics test is a troubleshooting tool for checking the connection
between the printer and the host computer. When the printer is in diagnostics mode, it prints all
data received from the host computer as straight ASCII characters with the hex values below the
ASCII text. The printer prints all characters received, including control codes such as CR
(carriage return). Figure 4 shows a typical test label from this test.
Figure 4 • Communications Diagnostics Test Label
To use communications diagnostics mode, complete these steps:
1. Ensure media is loaded and printer power is ON.
2. Set the print width equal to or less than the label width being used for the test.
3. Press and hold Pause + Feed for two seconds. When active, the STATUS indicator ( ) will
alternate between green and yellow.
The printer enters diagnostics mode and prints any data received from the host computer on
a test label
4. Check the test label for error codes. For any errors, check that your communication
parameters are correct.
Errors show on the test label as follows:
• FE indicates a framing error.
• OE indicates an overrun error.
• PE indicates a parity error.
• NE indicates noise.
5. Press and hold Pause + Feed for two seconds or turn the printer power off (O) and then back
ON to exit this self test and return to normal operation.
Note • The test label prints upside-down.
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