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i have been remove paper jammed but display always shows ' paper jammed in duplex unit '
Read this thread again from the start and you fill see the solution on several posts.
[QUOTE=Thomas Jansson;528817]I got my new FS-4200DN less a week ago.
Dear Mr. Thomas
Look at the bottom printer then you will see lever green/blue then pull it down then you will see one connecting sensor with that duplex unit . Before that, try to restart the printer while cassette open after the printer in the situation ready re-enter the cassette back. If same problem came out look at Duplex Board or Sensor maybe one of them is spoils.
I've did already but the same problem came out
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