The most common sensor on that entire series is what I call the "Bypass" sensor. This is the one underneath the bypass tray. Remove the Duplexer and Bypass, flip it over and you'll see it. The common symptom prior to these just GOING OUT is that the customer will tell you that the machine "runs on and on" for several minutes after a copy job, then finally throws a jam. At first glance, this would look like it was adding toner, but not the case.
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