How to resolve being stuck in manual weight mode on a DM300C, DM400C, and more

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Products affected: DM300C™, DM400C™, and DM475™
This may happen after replacing the ink cartridge and a message will appear on the display, Invalid Preset.  After re-installing the scale, the meter doesn't recognize it.
Follow these steps to activate the attached scale:
  1. Select Quit Presets
  2. Press Menu
  3. Select Setup
  4. press Page Down and select Serial Port
  5. Select Attached Scale
  6. Press Home
  7. Unplug the power cord
  8. Remove the scale
  9. Plug power cord back in but keep the scale off of the machine
  10. Once machine has booted up, place scale back on machine, ensuring there are no gaps between the scale and the meter
  11. Check that the meter is in Scale Mode.  Press the Weight Rate button if Rate Mail on Scale is present Select it.  Note: If the screen does NOT currently display 0 g, contact customer support.
  12. Select Lettepost. If selection is not available, go to step 13
  13. Select Dom Standard
  14. Press the Enter button
  15. Verify the top of the screen says 0 g.
If this has failed to resolve the issue, please contact customer support at 1-800-672-6937, from 8 am to 8 pm Eastern Time.

Follow these steps if you would like to store this as your Normal Preset:
  1. Press Menu
  2. Press Page Down and select Preset Options
  3. Select Set Normal Preset
  4. Select Yes
  5. Press Home
For more information on Normal preset, see How to set the normal preset on the DM300C, DM400C, and more.

UPDATED: 14 August 2021