1. Non-standard cards or bad cards.
Change the cards. (an ISO CR80 card (54mm x 86mm) must be used).
2. Card thickness control lever is not adjusted properly.
Adjust the card thickness gate to accommodate your card’s thickness. Refer to section 2.3 in the Printer User Manual.
3. Faulty card arrangement.
Arrange the cards again and put them in the input hopper. Refer to section 2.3 in the Printer User Manual.
4. Cards have static and moisture.
Remove the moisture or static.