I have a customer with a HP 4000n. I have replaced the maintenance kit including the half moon rollers. I could run around 20 sheets then get the 13.1 jam. While watching it looks like the rollers just do not grab right... yet all the rollers are new. They had another HP 4000n in storage that I brought out and put the maintenance kit in with the new rollers and still get the same 13.1 jams consistently. I am at a loss and know it can not be the sensor because it will feed some pages before jamming. The only thing remaining is that it is the paper... any other ideas?
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