Please take the following steps to run a Magnetic Self Test on a Fargo HDP820 printer
Ensure that you have mag cards properly loaded
Press the menu button on the front panel of the printer
Select Print Test Image
Use the down arrow key to select Magnetic Test
A card will be encoded and ejected
Use an external mag reader to verify the encoded card
Why is it always jam, when d card want to turn back the card. DTc550
I would first suggest cleaning your printer. If that doesn’t work, you can arrange to have your printer repaired by filling out this form: http://badgepros.com/repair/