We have a C652 throwing C8104. At setup the scan glass was out of position. I re-positioned and put the ADF scan glass sensitivity to not set and the warning level to zero. I thought this took care of the problem, however three days after the machine was delivered the code came back. Is there a way to completely turn off the scan glass so it doesn't move. Even though the sensitivity is set to non set the glass does a quick initialize when the doc feed is opened and closed.