After they moved the printer to a new building they got the code. I found it sitting on a cheap table in the hall and set it on teh solid floor. I happened to have a 4700 I had picked up from another customer, so I swapped the tray and when that didn't work I swapped the lift motor knowing that the one I was taking off another customers machine was fairly new, I had replaced it a few months ago. That also didn't work. When the tray try's to lift, the knocking noise begins and lifting up on the tray or shimming under ir with about 10 or 12 sheets of paper folded in half makes it stop. At this point all I can think to try is to strengthen the spring pulling the motor to the tray. Any thoughts?
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