Port for the Print Head Test - ^JT and ~HQJT ZPL Commands

Article ID: 46829968

Issue / Question

Head Test Information

Applicable To

Printers listed below

Resolution / Answer

Some Zebra printer models support the Head Test Feature.  This allows the user to run a test at a given interval and receive details on if a print head element has gone bad.  The ZPL command ^JT is used to set the test interval and the ~HQJT command can return the test results back to the host.  Here is an example using the Zebra Setup Utility to return data from the host. For more information, refer to Zebra Setup Utilities -- Sending Printer Commands and Receiving Data.

See the ZPL Programming Guide for details. 

  Standard PHD Extended PHD
LP/TLP2824 Plus Yes Not applicable
GK420 Yes Not applicable
GX420 Yes Not applicable
GC420 No Not applicable
HC100 No Not applicable
S4M No N/A
ZM400 / RZ400 No N/A
ZM600 / RZ600 No N/A
105SL No N/A
110PAX4 / R110PAX4 No Yes
170PAX4 ** Yes Yes
ZE500-4 No N/A
ZE500-6 ** Yes N/A
105SLPlus Option* N/A
110Xi4 / R110Xi4 ** Option* N/A
140Xi4 ** Yes N/A
170Xi4 ** Yes N/A
220Xi4 ** Yes N/A
ZT200 Series No No 
ZT410 ZT420 Series No No
ZT411 ZT421 Series Yes N/A

* Requires option board P1077930
** The HQJT command does not work with the Xi printers and never did. It is suggested that the ~HQES command be used to detect printhead test results

+ Product Codes

  • 110Xi4 Industrial Printer
  • 140Xi4 Industrial Printer
  • 170Xi4 Industrial Printer
  • 220Xi4 Industrial Printer
  • G-Series GK Desktop Printers
  • G-Series GX Desktop Printers
  • GK420 Healthcare Desktop Printers
  • GK420d Desktop Printer
  • GK420d Healthcare Desktop Printer
  • GK420t Desktop Printer
  • GK420t Healthcare Desktop Printer
  • GX420Rx Desktop Printer
  • GX420d Desktop Printer
  • GX420t Desktop Printer
  • GX430d Desktop Printer
  • GX430t Desktop Printer
  • R110Xi4 RFID Printer
  • Xi Series Industrial Printers
  • ZE500 Print Engines
  • ZE500 Print Engines