Let me explain the sitiuation first:
We have two HP LaserJet printer, one is P2035 and the other one is P2035n. They are both connected through USB cables to windows 7 operated Hp Pro computers. the network printer is also connected though the LAN cable. They were both working fine. we have changed the tuner a few times mainly with off the shelf OEM tuners. From a week ago they both started acting wired. When we try to print anything with them form the host computer they will print weird character with a few english character inbetween just on the top lines of the paper and then through the paper out and do the same to the next paper and soon will ran of paper. This force us to cancel the job manually with the red stop bottom on the printer itself. To add more to the complexity of the problem I should say that there is only one way that the printer prints fine with no issue and that is when we print from a seccond computer on the network through the shared printer on the host. It should be throught the host and its USB. If we connect the seccond computer to the printer throught the lan cable we get the same weird character.
we really apricate any help we can get. I'll attached images of the printed paper.