1. ZD421 and ZD621 Series Desktop Printers User Guide
  2. Maintenance
  3. Cleaning
  4. Replacing the Printhead
  5. Replacing the Printhead – ZD421/ZD621 Direct Thermal Printer Models
  • ZD421 and ZD621 Desktop Printers User Guide
Replacing the Printhead – ZD421/ZD621 Direct Thermal Printer Models

Replacing the Printhead – ZD421/ZD621 Direct Thermal Printer Models

  1. Use these steps to remove the printhead:
    1. Turn printer power OFF.
    2. Open the printer cover.
      1
      Printhead
    3. Push the printhead release latch away from the printhead. The right side of printhead releases.
    4. Swing the loose, right side of the printhead out of the printer. Pull it out and to the right a little to get the left side of the printhead clear.
    5. Pull the printhead out and free of the top cover to gain access to its attached cables on the backside of the printhead. In the figure that follows, the red outline indicates the printhead retainer slot which is on the left side as you face the open printer.
    6. Gently but firmly pull the two printhead cable bundle connectors off the printhead. Then pull the ground wire off the printhead.
      1
      Connectors
      3
      Printhead assembly
      2
      Printhead ground wire
  2. To replace the printhead:
    1. Push the right-side printhead cable connector into the printhead.
      The connector is keyed to only insert one way.
    2. Attach the ground wire to the printhead’s ground tab.
    3. Push the left-side printhead cable connector onto the printhead.
      1
      Connector with key
      3
      Printhead ground tab
      2
      Printhead ground wire
      4
      Spring wire notch
    4. Insert the left side of the printhead assembly into the recessed slot (highlighted in red) on the left side of the printer.
      1
      Slot
    5. Align the spring wire notch on the backside of the printhead to the spring wire. Push the right side of the printhead into the printer until the latch locks the right side of the printhead into the printer.
      1
      Spring wire in notch
    6. Verify that the printhead moves up and down freely when pressure is applied and remains locked when released.
    7. Clean the printhead. Use a new pen to wipe body oils (fingerprints) and debris of the printhead. Clean from the center of the printhead to the outside. See the detailed instructions for cleaning the printhead in the Maintenance section of this guide.
  3. Reload media, plug in the power cord (if removed), turn printer power ON, and print a configuration report to ensure proper function. See Test Printing with a Configuration Report.