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The most likely problem is the media gap sensor. Make sure it is in the proper position. See AMI Quick Guides Review the video titled Intermec Printer - Troubleshooting.
How can a Manager change an AMI User’s password?
The manager can login to the AMI Terminal server. There is an icon that looks like:
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Type in the user’s name to help narrow down the list
Select the user to update
Click on the Change Passwd Icon.
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Type in the new password and verification
Click Save