I have a HP LaserJet 1320tn, after I changed the

Hi if you says that the paper gets jam at the fuser meeting point than i m sure that registration assembly which register the paper with toner cartridge is not working properly this is internal hardware fault.
It may caused due to faulty pickup assembly too.
There is a small **** manual feed tray try to print using manual feed and check if the problem persists then registration assembly is faulty if the it print fine from manual feed than Tray 2 pickup assembly or pickup roller is faulty.