Replacing the printhead on the DM300M-DM475

Poor print quality after you installed a new ink cartridge or cleaned the printhead is a sign that you need to replace the printhead.
Products affected: DM300M™, DM400M™, DM475™ (G922, RG9224M)

You may need to install a new printhead when the existing printhead is producing poor print quality.

  1. If you have a scale, remove it from the top of the franking machine.
  2. Open the ink tank access cover.
  3. Select Replace Print Head.
  4. The carriage moves forward slightly. Unlock the green ink tank latch.
    Open the ink cartridge latch
  5. Remove the ink cartridge and place it on a flat surface with the blue circle facing up.
    Remove the ink cartridge
  6. Squeeze the two gray tabs on either side of the printhead.
    Squeeze the printhead tabs
  7. While squeezing, lift and tilt the printhead to the right. The printhead should come up out of the franking machine.
    Remove the printhead
  8. Unpack your new print head and remove the protective tape from the bottom.
    Unpack printhead
  9. Squeeze the tabs and slide the printhead pegs into the lower set of grooves.
    Insert the printhead
  10. Keep squeezing the tabs and push the printhead flush against the wall. The tabs will snap outward when placed correctly.
    Squeeze the printhead tabs and push the printhead against the wall
  11. Re-insert the ink cartridge then close the green ink cartridge guard. It clicks when fully closed.
    Install the new ink cartridge and close the latch
  12. Close the ink tank access cover and replace the scale, if applicable.
  13. Your franking machine detects the new printhead and prompts you to run a maintenance cycle.
  14. Your franking machine prompts you to print a test pattern. Select one of the following options:
    1. Select Yes, Print Test Pattern to print a test pattern.
    2. Select No to skip printing a test pattern and return to the Home screen.

UPDATED: 03 January 2023