Question edited for full 'make model (what it is)'.
Question moved to Kyocera.
Try a power reset. Remove cassettes. Pull mains plug for 2 full minutes. Reconnect. You should get a 'No Cassettes' message. Insert cassettes.
If that doesn't work, you will need Kyocera Service for this business machine. Some ideas in the link.
https://www.google.com/search?q=km+2560+not+detecting+cassettes
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