samsung CLp-300 不进纸了。一直提示卡纸，要如何处理？

samsung CLp-300 不进纸了。一直提示卡纸，要如何处理？probably roller rubber pick-up is the problemwhat right facing for rubber toward *** is: 'rough side' or 'fine side'?on most printers rubber is factory fitted with 'fine side' toward *** because friction is betterbut problem occurs when rubber become streched