try to check the maintenance kit of you printer, the possible cause of that are the two main parts of fuser assembly one is the upper roller which is the fixing assembly w/ fuser sleeve try to look at it if it has a silicon paste, if not apply a silicon. the other one is the lower roller which is the pressure roller. check it if you think that it's soo soft rather than the original you need to replace it..
when you done that things your unit is good condition again..
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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.
maybe your fuser assembly has a problem with fuser sleeves i think it's lack of silicon paste which is causing the jam on your fuser assembly. try to apply a silicon paste if have it but if not you need to drop it on a service center
http://www.computercarefiles.com/hp_docs/lj_1160_1320/kit_instructions.pdf for step-by-step instructions - the fuser part is 16 pages long. Removal of 15-20 screws, a fan, duplex gears, 6-8 block connectors, and a good hour of my time, now I need to find time to strip the good fuser from the other printer and rebuild this one. Having worked on Laserjet 4s and 5s, which require the removal of 2 (TWO ! !) screws for the fuser, HP have gone right down in my estimation. Don't even start this unless the printer is vital to the situation, or you know for sure the customer will pay the labour charge, or labour is cheap.Good luck.
Managed to solve this myself: I disassembled the printer and noticed there was a paper jammed in the duplex tray. Rolls were all ok, but the paper blocked the use of the duplex pathway. For disassembly help check the HP 1320 service manual, which you can find on the net as a PDF.