How to resolve print head not installed on the DM400, DM500 and more
Products affected: DM400™, DM500™, DM550™, DM800™, DM800i™, DM900™, DM1000™, and DM1100™
Issue
The meter displays the message Print Head Not Installed and will not print.
Cause
The meter does not detect a print head.
Resolution
Rerun the print head installation procedure: 
If your issue is not resolved or if cleaning the print nozzles has no effect, contact customer support from 8 am to 8 pm Eastern Time. Have your model number ready.
- Press Menu
- Select Maintenance
- Select Replace Print Head
- Open the cover over the printer
- Open the gray latch on the print carriage
- Lift the print head cover
- Remove the print head and re-insert it
- Close the print head cover
- Close the gray latch
- Close the cover over the printer
- Run a test print on either a tape or envelope
- If the test pattern looks good select yes
- If the test pattern is missing or has broken lines select no to clean the print nozzles
- Do not perform more then 3 nozzle cleaning
If your issue is not resolved or if cleaning the print nozzles has no effect, contact customer support from 8 am to 8 pm Eastern Time. Have your model number ready.
UPDATED: June 22, 2020
